Enable CI

.drone.yml

@@ -0,0 +1,14 @@
+kind: pipeline
+name: default
+
+steps:
+- name: build
+  image: rust
+  commands:
+    - cargo build --verbose --all
+
+- name: fmt-check
+  image: rust
+  commands:
+    - rustup component add rustfmt 
+    - cargo fmt --all -- --check

.gitignore

@@ -1,2 +1,3 @@
 /target
+/crates/*/target
 Cargo.lock

CHANGELOG.md

@@ -0,0 +1,58 @@
+## MewssageBus pending changes:
+
+### 0.8.0
+#### new features:
+* Generator Handlers
+* Message Masking
+
+### 0.7.0
+#### new features:
+* Bus scopes (`enter` and `leave` methods) instead clone
+* Bus relays. Connect other message bus by IP address 
+
+#### breaking changes:
+* Batched handlers now require `InBatch` and `OutBatch` types 
+
+## MewssageBus changelog:
+
+### 0.6.5
+#### new features:
+* the `Message` trait no more required to be `Clone`
+* added methods `send_one`, `send_one_blocked`, `try_send_one` which does not require `Message: Clone`
+
+### 0.6.4
+#### new features:
+* added struct `Module` and `BusBuilder::add_module` 
+
+### 0.6.3
+#### fixes:
+* Update Error Handling
+
+#### breaking changes:
+* all methods now return `messagenus::Error`
+
+### 0.6.2 
+#### new features:
+* add `request_we` for requests when we know the handler's error type 
+
+#### fixes:
+* Update Error Handling
+
+#### breaking changes:
+* send methods now return `messagenus::SendError`
+
+#### notes:
+* Got rid of `anyhow::Error`
+
+### 0.6.0 
+#### new features:
+* Request/Response API (request method)
+
+#### fixes:
+* Fix some unwaked receivers
+
+#### breaking changes:
+* Add `type Response` and `type Error` into all handlers
+
+#### notes:
+* Refactorin Receivers API

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "messagebus"
-version = "0.4.6"
+version = "0.9.13"
 authors = ["Andrey Tkachenko <andrey@aidev.ru>"]
 repository = "https://github.com/andreytkachenko/messagebus.git"
 keywords = ["futures", "async", "tokio", "message", "bus"]
@@ -10,13 +10,34 @@ license = "MIT OR Apache-2.0"
 exclude = [".gitignore", ".cargo/config", ".github/**", "codecov.yml"]
 edition = "2018"
 
+[workspace]
+members = ["crates/remote", "crates/derive"]
+
 [dependencies]
-tokio = { version = "0.2", features = ["parking_lot", "rt-threaded", "sync", "stream", "blocking"] }
-parking_lot = "0.11.1"
-async-trait = "0.1.42"
-futures = "0.3.8"
-anyhow = "1.0.34"
-crossbeam = "0.8.0"
+messagebus_derive = "0.2.5"
+
+tokio = { version = "1", features = ["parking_lot", "rt-multi-thread", "sync", "time"] }
+parking_lot = "0.11"
+async-trait = "0.1"
+futures = "0.3"
+smallvec = "1.6"
+log = "0.4"
+sharded-slab = "0.1"
+thiserror = "1"
+erased-serde = "0.3"
+serde = "1"
+serde_derive = "1"
+dashmap = "4.0"
+ctor = "0.1.21"
 
 [dev-dependencies]
-tokio = { version = "0.2", features = ["parking_lot", "rt-threaded", "sync", "stream", "macros"] }
+anyhow = "1.0"
+env_logger = "0.9"
+serde_json = "1.0"
+tokio = { version = "1", features = [
+  "macros",
+  "parking_lot",
+  "rt-multi-thread",
+  "io-util",
+  "sync",
+] }

README.md

@@ -11,67 +11,118 @@ Inspired by Actix
 ### Basics
 1. Can deliver messages between actors using receivers (usually a queue implementations)
 2. Messages distincts and delivers by TypeId
-3. Messages delivers in a broadcast fashion to many receivers (Cloned)
+3. Messages delivers ether in a broadcast fashion to many receivers (Cloned) or addressed by recevier id, balanced (depends on queue load) or random
 4. There are different kind of receivers implemented:
-  - BufferUnordered Receiver (in sync and async version depending by handler)
-  - Synchronized (also sync and async) if receiving part needs syncronization
-  - SynchronizeBuffered (also sync and async)
-here are the implmented handlers definitions:
-```rust
+  - BufferUnordered Receiver (sync and async)
+  - Synchronized (sync and async)
+  - BatchedBufferUnordered Receiver (sync and async)
+  - BatchedSynchronized (sync and async)
+5. Request/response api. There is an example is [demo_req_resp.rs](./examples/demo_req_resp.rs)
 
-// Handler is Sync and we can spawn many of concurrent tasks
+Here are the list of implmented handler kinds:
+```rust
 pub trait Handler<M: Message>: Send + Sync {
-    fn handle(&self, msg: M, bus: &Bus) -> anyhow::Result<()>;
-    fn sync(&self, _bus: &Bus) -> anyhow::Result<()> {Ok(())}
+    type Error: StdSyncSendError;
+    type Response: Message;
+
+    fn handle(&self, msg: M, bus: &Bus) -> Result<Self::Response, Self::Error>;
+    fn sync(&self, _bus: &Bus) -> Result<(), Self::Error> {
+        Ok(())
+    }
 }
 
 #[async_trait]
 pub trait AsyncHandler<M: Message>: Send + Sync {
-    async fn handle(&self, msg: M, bus: &Bus) -> anyhow::Result<()>;
-    async fn sync(&self, _bus: &Bus) -> anyhow::Result<()> {Ok(())}
+    type Error: StdSyncSendError;
+    type Response: Message;
+
+    async fn handle(&self, msg: M, bus: &Bus) -> Result<Self::Response, Self::Error>;
+    async fn sync(&self, _bus: &Bus) -> Result<(), Self::Error> {
+        Ok(())
+    }
 }
 
-// Handler is not Sync and we cannot spawn many of concurrent tasks same time (uses synchronization primitives such as Mutex or RwLock)
 pub trait SynchronizedHandler<M: Message>: Send {
-    fn handle(&mut self, msg: M, bus: &Bus) -> anyhow::Result<()>;
-    fn sync(&mut self, _bus: &Bus) -> anyhow::Result<()> {Ok(())}
+    type Error: StdSyncSendError;
+    type Response: Message;
+
+    fn handle(&mut self, msg: M, bus: &Bus) -> Result<Self::Response, Self::Error>;
+    fn sync(&mut self, _bus: &Bus) -> Result<(), Self::Error> {
+        Ok(())
+    }
 }
 
 #[async_trait]
 pub trait AsyncSynchronizedHandler<M: Message>: Send {
-    async fn handle(&mut self, msg: M, bus: &Bus) -> anyhow::Result<()>;
-    async fn sync(&mut self, _bus: &Bus) -> anyhow::Result<()> {Ok(())}
+    type Error: StdSyncSendError;
+    type Response: Message;
+
+    async fn handle(&mut self, msg: M, bus: &Bus) -> Result<Self::Response, Self::Error>;
+    async fn sync(&mut self, _bus: &Bus) -> Result<(), Self::Error> {
+        Ok(())
+    }
+}
+
+pub trait BatchHandler<M: Message>: Send + Sync {
+    type Error: StdSyncSendError + Clone;
+    type Response: Message;
+    type InBatch: FromIterator<M> + Send;
+    type OutBatch: IntoIterator<Item = Self::Response> + Send;
+
+    fn handle(&self, msg: Self::InBatch, bus: &Bus) -> Result<Self::OutBatch, Self::Error>;
+    fn sync(&self, _bus: &Bus) -> Result<(), Self::Error> {
+        Ok(())
+    }
+}
+
+#[async_trait]
+pub trait AsyncBatchHandler<M: Message>: Send + Sync {
+    type Error: StdSyncSendError + Clone;
+    type Response: Message;
+    type InBatch: FromIterator<M> + Send;
+    type OutBatch: IntoIterator<Item = Self::Response> + Send;
+
+    async fn handle(&self, msg: Self::InBatch, bus: &Bus) -> Result<Self::OutBatch, Self::Error>;
+    async fn sync(&self, _bus: &Bus) -> Result<(), Self::Error> {
+        Ok(())
+    }
 }
 
-// Handler is not Sync and handler will process items in batched mode 
 pub trait BatchSynchronizedHandler<M: Message>: Send {
-    fn handle(&mut self, msg: Vec<M>, bus: &Bus) -> anyhow::Result<()>;
-    fn sync(&mut self, _bus: &Bus) -> anyhow::Result<()> {Ok(())}
+    type Error: StdSyncSendError + Clone;
+    type Response: Message;
+    type InBatch: FromIterator<M> + Send;
+    type OutBatch: IntoIterator<Item = Self::Response> + Send;
+
+    fn handle(&mut self, msg: Self::InBatch, bus: &Bus) -> Result<Self::OutBatch, Self::Error>;
+    fn sync(&mut self, _bus: &Bus) -> Result<(), Self::Error> {
+        Ok(())
+    }
 }
 
 #[async_trait]
 pub trait AsyncBatchSynchronizedHandler<M: Message>: Send {
-    async fn handle(&mut self, msg: Vec<M>, bus: &Bus) -> anyhow::Result<()>;
-    async fn sync(&mut self, _bus: &Bus) -> anyhow::Result<()> {Ok(())}
+    type Error: StdSyncSendError + Clone;
+    type Response: Message;
+    type InBatch: FromIterator<M> + Send;
+    type OutBatch: IntoIterator<Item = Self::Response> + Send;
+
+    async fn handle(&mut self, msg: Self::InBatch, bus: &Bus) -> Result<Self::OutBatch, Self::Error>;
+    async fn sync(&mut self, _bus: &Bus) -> Result<(), Self::Error> {
+        Ok(())
+    }
 }
 
 ```
-4. Handler Kinds:
-    1. No Synchronization needed (Handler is `Send` + `Sync`)
-        * Not batched operations **(implemented)**
+6. Implemented handler kinds:
+    1. No Synchronization needed (Handler implements `Send` and `Sync`)
+        * Not batched operations
             - sync  (spawn_blocking)
             - async (spawn)
         * Batched
             - sync  (spawn_blocking)
             - async (spawn)
-    2. Synchronization needed (Handler is `Sync` + `!Send`)
-        * Not batched operations **(implemented)**
-            - sync  (spawn_blocking)
-            - async (spawn)
-        * Batched **(implemented)**
-            - sync  (spawn_blocking)
-            - async (spawn)
-    3. Synchronization needed and thread dedicated (Handler is `!Sync` + `!Send`)
+    2. Synchronization needed (Handler implements only `Send` but not implements `Sync`)
         * Not batched operations
             - sync  (spawn_blocking)
             - async (spawn)
@@ -79,16 +130,28 @@ pub trait AsyncBatchSynchronizedHandler<M: Message>: Send {
             - sync  (spawn_blocking)
             - async (spawn)
     
-5. Example:
+7. Not yet implemented handler kinds:
+    1. Synchronization needed and thread dedicated (Handler is `!Sync` and `!Send`)
+        * Not batched operations
+            - sync  (spawn_blocking)
+            - async (spawn)
+        * Batched
+            - sync  (spawn_blocking)
+            - async (spawn)
+
+8. Example:
 ```rust
-use messagebus::{Bus, AsyncHandler, Result as MbusResult, receivers};
+use messagebus::{error::Error, receivers, AsyncHandler, Bus};
 use async_trait::async_trait;
 
 struct TmpReceiver;
 
 #[async_trait]
 impl AsyncHandler<i32> for TmpReceiver {
-    async fn handle(&self, msg: i32, bus: &Bus) -> MbusResult {
+    type Error = Error;
+    type Response = ();
+
+    async fn handle(&self, msg: i32, bus: &Bus) -> Result<Self::Response, Self::Error> {
         println!("---> i32 {}", msg);
 
         bus.send(2i64).await?;
@@ -99,7 +162,10 @@ impl AsyncHandler<i32> for TmpReceiver {
 
 #[async_trait]
 impl AsyncHandler<i64> for TmpReceiver {
-    async fn handle(&self, msg: i64, _bus: &Bus) -> MbusResult {
+    type Error = Error;
+    type Response = ();
+
+    async fn handle(&self, msg: i64, _bus: &Bus) -> Result<Self::Response, Self::Error> {
         println!("---> i64 {}", msg);
 
         Ok(())
@@ -110,12 +176,22 @@ impl AsyncHandler<i64> for TmpReceiver {
 async fn main() {
     let (b, poller) = Bus::build()
         .register(TmpReceiver)
-            .subscribe::<i32, receivers::BufferUnorderedAsync<_>>(Default::default())
-            .subscribe::<i64, receivers::BufferUnorderedAsync<_>>(Default::default())
+            .subscribe::<i32, receivers::BufferUnorderedAsync<_>, _, _>(8, Default::default())
+            .subscribe::<i64, receivers::BufferUnorderedAsync<_>, _, _>(8, Default::default())
             .done()
         .build();
 
     b.send(1i32).await.unwrap();
-    poller.await
+
+    println!("flush");
+    b.flush().await;
+
+    println!("close");
+    b.close().await;
+
+    println!("closed");
+
+    poller.await;
+    println!("[done]");
 }
 ```

crates/derive/Cargo.toml

@@ -0,0 +1,19 @@
+[package]
+name = "messagebus_derive"
+version = "0.2.5"
+authors = ["Andrey Tkachenko <andrey@aidev.ru>"]
+repository = "https://github.com/andreytkachenko/messagebus.git"
+keywords = ["futures", "async", "tokio", "message", "bus"]
+categories = ["network-programming", "asynchronous"]
+description = "MessageBus allows intercommunicate with messages between modules"
+license = "MIT OR Apache-2.0"
+exclude = [".gitignore", ".cargo/config", ".github/**", "codecov.yml"]
+edition = "2018"
+
+[lib]
+proc-macro = true
+
+[dependencies]
+proc-macro2 = "1"
+quote = "1"
+syn = {version = "1", features = ["full"]}

crates/derive/src/lib.rs

@@ -0,0 +1,350 @@
+#![recursion_limit = "128"]
+
+extern crate proc_macro;
+
+// use proc_macro::{TokenStream};
+use proc_macro2::{Ident, Span, TokenStream};
+use quote::{quote, ToTokens};
+use std::collections::hash_map;
+use std::fmt::Write;
+use std::hash::Hasher;
+use syn::parse::{Parse, ParseStream};
+use syn::{parenthesized, Result};
+use syn::{punctuated::Punctuated, token::Comma, DeriveInput};
+
+fn shared_part(_ast: &syn::DeriveInput, has_shared: bool) -> proc_macro2::TokenStream {
+    if has_shared {
+        quote! {
+            fn as_shared_ref(&self) -> std::option::Option<&dyn messagebus::SharedMessage> {Some(self)}
+            fn as_shared_mut(&mut self) -> std::option::Option<&mut dyn messagebus::SharedMessage>{Some(self)}
+            fn as_shared_boxed(self: Box<Self>) -> Result<Box<dyn messagebus::SharedMessage>, Box<dyn messagebus::Message>> {Ok(self)}
+            fn as_shared_arc(self: std::sync::Arc<Self>) -> Option<std::sync::Arc<dyn messagebus::SharedMessage>>{Some(self)}
+        }
+    } else {
+        quote! {
+            fn as_shared_ref(&self) -> std::option::Option<&dyn messagebus::SharedMessage> {None}
+            fn as_shared_mut(&mut self) -> std::option::Option<&mut dyn messagebus::SharedMessage> {None}
+            fn as_shared_boxed(self: Box<Self>) -> Result<Box<dyn messagebus::SharedMessage>, Box<dyn messagebus::Message>> {Err(self)}
+            fn as_shared_arc(self: std::sync::Arc<Self>) -> Option<std::sync::Arc<dyn messagebus::SharedMessage>> {None}
+        }
+    }
+}
+
+fn clone_part(ast: &syn::DeriveInput, has_clone: bool) -> proc_macro2::TokenStream {
+    let name = &ast.ident;
+    let (_, ty_generics, _) = ast.generics.split_for_impl();
+
+    if has_clone {
+        quote! {
+            fn try_clone_into(&self, into: &mut dyn core::any::Any) -> bool {
+                let into = if let Some(inner) = into.downcast_mut::<Option<#name #ty_generics>>() {
+                    inner
+                } else {
+                    return false;
+                };
+
+                into.replace(core::clone::Clone::clone(self));
+                true
+            }
+            fn try_clone_boxed(&self) -> std::option::Option<std::boxed::Box<dyn messagebus::Message>>{
+                Some(Box::new(core::clone::Clone::clone(self)))
+            }
+            fn try_clone(&self) -> Option<Self> {
+                Some(core::clone::Clone::clone(self))
+            }
+        }
+    } else {
+        quote! {
+            fn try_clone_into(&self, into: &mut dyn core::any::Any) -> bool {false}
+            fn try_clone_boxed(&self) -> std::option::Option<std::boxed::Box<dyn messagebus::Message>>{ None }
+            fn try_clone(&self) -> Option<Self> { None }
+        }
+    }
+}
+
+fn type_tag_part(
+    ast: &syn::DeriveInput,
+    type_tag: Option<String>,
+    namespace: Option<String>,
+) -> proc_macro2::TokenStream {
+    let class_name = &ast.ident;
+    let name = if let Some(tt) = type_tag {
+        tt
+    } else if let Some(ns) = namespace {
+        format!("{}::{}", ns, class_name)
+    } else {
+        class_name.to_string()
+    };
+
+    let (_, ty_generics, where_clause) = ast.generics.split_for_impl();
+    let mut impl_generics = ast.generics.clone();
+
+    let mut type_name = String::new();
+    let mut type_values = String::from("(");
+    let mut need_close = false;
+
+    write!(&mut type_name, "{}", name).unwrap();
+    for mut param in impl_generics.params.pairs_mut() {
+        match &mut param.value_mut() {
+            syn::GenericParam::Lifetime(_) => continue,
+            syn::GenericParam::Type(param) => {
+                if !need_close {
+                    type_name.push('<');
+                    need_close = true;
+                } else {
+                    type_name.push(',');
+                    type_values.push(',');
+                }
+
+                type_name.push_str("{}");
+
+                write!(
+                    &mut type_values,
+                    "<{} as messagebus::TypeTagged>::type_tag_()",
+                    param.ident
+                )
+                .unwrap();
+
+                let bound: syn::TypeParamBound = syn::parse_str("messagebus::TypeTagged").unwrap();
+                param.bounds.push(bound);
+            }
+            syn::GenericParam::Const(_param) => {
+                unimplemented!()
+            }
+        }
+    }
+
+    if need_close {
+        type_name.push('>');
+    }
+
+    if type_values.len() > 1 {
+        type_values.push_str(",)");
+
+        let type_values: syn::ExprTuple = syn::parse_str(&type_values).unwrap();
+        let type_values = type_values.elems;
+
+        quote! {
+            impl #impl_generics messagebus::TypeTagged for #class_name #ty_generics #where_clause {
+                fn type_tag_() -> messagebus::TypeTag { format!(#type_name, #type_values).into() }
+                fn type_tag(&self) -> messagebus::TypeTag {  Self::type_tag_() }
+                fn type_name(&self) -> std::borrow::Cow<str> {  Self::type_tag_() }
+                fn type_layout(&self) -> std::alloc::Layout { std::alloc::Layout::for_value(self) }
+            }
+        }
+    } else {
+        quote! {
+            impl #impl_generics messagebus::TypeTagged for #class_name #ty_generics #where_clause {
+                fn type_tag_() -> messagebus::TypeTag { #type_name.into() }
+                fn type_tag(&self) -> messagebus::TypeTag {  Self::type_tag_() }
+                fn type_name(&self) -> std::borrow::Cow<str> {  Self::type_tag_() }
+                fn type_layout(&self) -> std::alloc::Layout { std::alloc::Layout::for_value(self) }
+            }
+        }
+    }
+}
+
+struct TypeTag {
+    pub inner: syn::LitStr,
+}
+
+impl Parse for TypeTag {
+    fn parse(input: ParseStream) -> Result<Self> {
+        let content;
+        parenthesized!(content in input);
+        let punctuated = Punctuated::<syn::LitStr, Comma>::parse_terminated(&content)?;
+
+        let inner = punctuated.pairs().map(|x| x.into_value()).next();
+
+        Ok(TypeTag {
+            inner: inner.unwrap().to_owned(),
+        })
+    }
+}
+
+#[derive(Default, Debug)]
+struct Tags {
+    has_clone: bool,
+    has_shared: bool,
+}
+
+impl Tags {
+    pub fn add(&mut self, other: Tags) {
+        self.has_clone = self.has_clone || other.has_clone;
+        self.has_shared = self.has_shared || other.has_shared;
+    }
+}
+
+impl Parse for Tags {
+    fn parse(input: ParseStream) -> Result<Self> {
+        let mut has_shared = false;
+        let mut has_clone = false;
+
+        let content;
+        parenthesized!(content in input);
+        let punctuated = Punctuated::<syn::Ident, Comma>::parse_terminated(&content)?;
+
+        for pair in punctuated.pairs() {
+            let val = pair.into_value().to_string();
+            match val.as_str() {
+                "shared" => has_shared = true,
+                "clone" => has_clone = true,
+                _ => (),
+            }
+        }
+
+        Ok(Tags {
+            has_clone,
+            has_shared,
+        })
+    }
+}
+
+#[proc_macro_derive(Message, attributes(type_tag, message, namespace))]
+pub fn derive_message(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
+    let mut tags = Tags::default();
+    let mut type_tag = None;
+    let mut namespace = None;
+
+    let ast: DeriveInput = syn::parse(input).unwrap();
+    let name = &ast.ident;
+    let (_, ty_generics, where_clause) = ast.generics.split_for_impl();
+    for attr in &ast.attrs {
+        if let Some(i) = attr.path.get_ident() {
+            match i.to_string().as_str() {
+                "message" => {
+                    let tt: Tags = syn::parse2(attr.tokens.clone()).unwrap();
+                    tags.add(tt);
+                }
+
+                "type_tag" => {
+                    let tt: TypeTag = syn::parse2(attr.tokens.clone()).unwrap();
+                    type_tag = Some(tt.inner.value());
+                }
+
+                "namespace" => {
+                    let tt: TypeTag = syn::parse2(attr.tokens.clone()).unwrap();
+                    namespace = Some(tt.inner.value());
+                }
+
+                _ => (),
+            }
+        }
+    }
+
+    let mut impl_generics = ast.generics.clone();
+    for mut param in impl_generics.params.pairs_mut() {
+        match &mut param.value_mut() {
+            syn::GenericParam::Lifetime(_) => {}
+            syn::GenericParam::Type(params) => {
+                let bound: syn::TypeParamBound =
+                    syn::parse_str("messagebus::MessageBounds").unwrap();
+
+                params.bounds.push(bound);
+
+                if tags.has_shared {
+                    let bound: syn::TypeParamBound =
+                        syn::parse_str("messagebus::__reexport::serde::Serialize").unwrap();
+
+                    params.bounds.push(bound);
+
+                    let bound: syn::TypeParamBound =
+                        syn::parse_str("messagebus::__reexport::serde::Deserialize<'de>").unwrap();
+
+                    params.bounds.push(bound);
+                }
+
+                if tags.has_clone {
+                    let bound: syn::TypeParamBound = syn::parse_str("core::clone::Clone").unwrap();
+
+                    params.bounds.push(bound);
+                }
+            }
+            syn::GenericParam::Const(_) => {}
+        }
+    }
+
+    let type_tag_part = type_tag_part(&ast, type_tag, namespace);
+    let shared_part = shared_part(&ast, tags.has_shared);
+    let clone_part = clone_part(&ast, tags.has_clone);
+
+    let init = Ident::new(
+        &format!("__init_{}", hash(ast.clone().into_token_stream())),
+        Span::call_site(),
+    );
+    let init_impl = if tags.has_shared && impl_generics.params.is_empty() {
+        quote! {
+            #[allow(non_upper_case_globals)]
+            #[messagebus::ctor::ctor]
+            fn #init() {
+                messagebus::register_shared_message::<#name>();
+            }
+        }
+    } else {
+        quote! {}
+    };
+
+    if !impl_generics.params.is_empty() && tags.has_shared {
+        impl_generics
+            .params
+            .push(syn::GenericParam::Lifetime(syn::LifetimeDef::new(
+                syn::Lifetime::new("'de", Span::call_site()),
+            )))
+    }
+
+    let tokens = quote! {
+        #type_tag_part
+
+        impl #impl_generics messagebus::Message for #name #ty_generics #where_clause {
+            fn as_any_ref(&self) -> &dyn core::any::Any {self}
+            fn as_any_mut(&mut self) -> &mut dyn core::any::Any {self}
+            fn as_any_boxed(self: std::boxed::Box<Self>) -> std::boxed::Box<dyn core::any::Any> {self}
+            fn as_any_arc(self: std::sync::Arc<Self>) -> std::sync::Arc<dyn core::any::Any> {self}
+
+            #shared_part
+            #clone_part
+        }
+
+        #init_impl
+    };
+
+    tokens.into()
+}
+
+#[proc_macro_derive(Error, attributes(type_tag, namespace))]
+pub fn derive_error(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
+    let mut type_tag = None;
+    let mut namespace = None;
+
+    let ast: DeriveInput = syn::parse(input).unwrap();
+    for attr in &ast.attrs {
+        if let Some(i) = attr.path.get_ident() {
+            match i.to_string().as_str() {
+                "type_tag" => {
+                    let tt: TypeTag = syn::parse2(attr.tokens.clone()).unwrap();
+                    type_tag = Some(tt.inner.value());
+                }
+
+                "namespace" => {
+                    let tt: TypeTag = syn::parse2(attr.tokens.clone()).unwrap();
+                    namespace = Some(tt.inner.value());
+                }
+
+                _ => (),
+            }
+        }
+    }
+
+    let type_tag_part = type_tag_part(&ast, type_tag, namespace);
+    let tokens = quote! {
+        #type_tag_part
+    };
+
+    tokens.into()
+}
+
+fn hash(input: TokenStream) -> u64 {
+    let mut hasher = hash_map::DefaultHasher::new();
+    hasher.write(input.to_string().as_bytes());
+    hasher.finish()
+}

crates/remote/Cargo.toml

@@ -0,0 +1,44 @@
+[package]
+name = "messagebus_remote"
+version = "0.1.0"
+authors = ["Andrey Tkachenko <andrey@aidev.ru>"]
+repository = "https://github.com/andreytkachenko/messagebus.git"
+keywords = ["futures", "async", "tokio", "message", "bus", "quic", "remote", "rpc", "parallel", "computing"]
+categories = ["network-programming", "asynchronous"]
+description = "MessageBus remote allows intercommunicate by messages between instances"
+license = "MIT OR Apache-2.0"
+exclude = [".gitignore", ".cargo/config", ".github/**", "codecov.yml"]
+edition = "2018"
+
+# [features]
+# quic = ["quinn"]
+
+[dependencies]
+thiserror = "1.0"
+messagebus = { path = "../../" }
+tokio = { version = "1", features = ["parking_lot", "rt-multi-thread", "sync", "time", "io-util"] }
+parking_lot = "0.11"
+quinn = "0.7"
+rmp = "0.8.10"
+rmp-serde = "0.15.5"
+erased-serde = "0.3.16"
+serde_derive = "1.0.130"
+serde = "1.0.130"
+futures = "0.3.17"
+cbor = "0.4.1"
+serde_cbor = "0.11.2"
+bytes = "1.1.0"
+quinn-proto = "0.7.3"
+rustls = "0.19.1"
+redis = {version = "0.21.2", features = ["aio", "tokio-comp"]}
+bitflags = "1.2.1"
+serde_json = "1.0.68"
+log = "0.4.14"
+
+[dev-dependencies]
+anyhow = "1.0.44"
+async-trait = "0.1.51"
+thiserror = "1.0.29"
+tokio = { version = "1.11.0", features = ["full"] }
+# quinn = { version = "0.7", optional = true }
+

crates/remote/examples/quic_client.rs

@@ -0,0 +1,60 @@
+use messagebus::derive::Message;
+use messagebus::error::GenericError;
+use messagebus::{Bus, TypeTagged};
+use messagebus_remote::relays::QuicClientRelay;
+use serde_derive::{Deserialize, Serialize};
+
+#[derive(Serialize, Deserialize, Debug, Clone, Message)]
+#[namespace("example")]
+#[message(shared, clone)]
+pub struct Req {
+    data: i32,
+    text: String,
+}
+
+#[derive(Serialize, Deserialize, Debug, Clone, Message)]
+#[namespace("example")]
+#[message(shared, clone)]
+pub struct Resp {
+    data: i32,
+    text: String,
+}
+
+#[tokio::main]
+async fn main() {
+    let relay = QuicClientRelay::new(
+        "./examples/cert.der",
+        "127.0.0.1:8083".parse().unwrap(),
+        "localhost".into(),
+        (
+            vec![(
+                Req::type_tag_(),
+                Some((Resp::type_tag_(), GenericError::type_tag_())),
+            )],
+            vec![],
+        ),
+    )
+    .unwrap();
+
+    let (b, poller) = Bus::build().register_relay(relay).build();
+
+    b.ready().await;
+    println!("ready");
+
+    let resp: Resp = b
+        .request(
+            Req {
+                data: 12,
+                text: String::from("test"),
+            },
+            Default::default(),
+        )
+        .await
+        .unwrap();
+
+    println!("resp {:?}", resp);
+
+    b.flush_all().await;
+    b.close().await;
+    poller.await;
+}

crates/remote/examples/quic_server.rs

@@ -0,0 +1,88 @@
+use async_trait::async_trait;
+use messagebus::{
+    derive::{Error as MbError, Message},
+    error::{self, GenericError},
+    AsyncHandler, Bus, Message, TypeTagged,
+};
+use messagebus_remote::relays::QuicServerRelay;
+use serde_derive::{Deserialize, Serialize};
+use thiserror::Error;
+
+#[derive(Debug, Error, MbError)]
+enum Error {
+    #[error("Error({0})")]
+    Error(anyhow::Error),
+}
+
+impl<M: Message> From<error::Error<M>> for Error {
+    fn from(err: error::Error<M>) -> Self {
+        Self::Error(err.into())
+    }
+}
+
+#[derive(Serialize, Deserialize, Debug, Clone, Message)]
+#[namespace("example")]
+#[message(shared, clone)]
+pub struct Req {
+    data: i32,
+    text: String,
+}
+
+#[derive(Serialize, Deserialize, Debug, Clone, Message)]
+#[namespace("example")]
+#[message(shared, clone)]
+pub struct Resp {
+    data: i32,
+    text: String,
+}
+
+struct TmpReceiver;
+
+#[async_trait]
+impl AsyncHandler<Req> for TmpReceiver {
+    type Error = Error;
+    type Response = Resp;
+
+    async fn handle(&self, msg: Req, _bus: &Bus) -> Result<Self::Response, Self::Error> {
+        println!("TmpReceiver::handle {:?}", msg);
+        Ok(Resp {
+            data: msg.data + 12,
+            text: format!("<< {} >>", msg.text),
+        })
+    }
+
+    async fn sync(&self, _bus: &Bus) -> Result<(), Self::Error> {
+        println!("TmpReceiver::sync");
+        Ok(())
+    }
+}
+
+#[tokio::main]
+async fn main() {
+    let relay = QuicServerRelay::new(
+        "./examples/cert.key",
+        "./examples/cert.der",
+        "0.0.0.0:8083".parse().unwrap(),
+        (
+            vec![],
+            vec![(
+                Req::type_tag_(),
+                Some((Resp::type_tag_(), GenericError::type_tag_())),
+            )],
+        ),
+    )
+    .unwrap();
+
+    let (b, poller) = Bus::build()
+        .register_relay(relay)
+        .register(TmpReceiver)
+        .subscribe_async::<Req>(8, Default::default())
+        .done()
+        .build();
+
+    b.ready().await;
+
+    println!("ready");
+
+    poller.await;
+}

crates/remote/examples/tcp_client.rs

@@ -0,0 +1,58 @@
+use messagebus::derive::Message;
+use messagebus::error::GenericError;
+use messagebus::{Bus, TypeTagged};
+use messagebus_remote::relays::TcpRelay;
+use serde_derive::{Deserialize, Serialize};
+
+#[derive(Serialize, Deserialize, Debug, Clone, Message)]
+#[namespace("example")]
+#[message(shared, clone)]
+pub struct Req {
+    data: i32,
+    text: String,
+}
+
+#[derive(Serialize, Deserialize, Debug, Clone, Message)]
+#[namespace("example")]
+#[message(shared, clone)]
+pub struct Resp {
+    data: i32,
+    text: String,
+}
+
+#[tokio::main]
+async fn main() {
+    let relay = TcpRelay::new(
+        false,
+        "0.0.0.0:8083".parse().unwrap(),
+        (
+            vec![(
+                Req::type_tag_(),
+                Some((Resp::type_tag_(), GenericError::type_tag_())),
+            )],
+            vec![],
+        ),
+    );
+
+    let (b, poller) = Bus::build().register_relay(relay).build();
+
+    b.ready().await;
+    println!("ready");
+
+    let resp: Resp = b
+        .request(
+            Req {
+                data: 12,
+                text: String::from("test"),
+            },
+            Default::default(),
+        )
+        .await
+        .unwrap();
+
+    println!("resp {:?}", resp);
+
+    b.flush_all().await;
+    b.close().await;
+    poller.await;
+}

crates/remote/examples/tcp_server.rs

@@ -0,0 +1,86 @@
+use async_trait::async_trait;
+use messagebus::{
+    derive::{Error as MbError, Message},
+    error::{self, GenericError},
+    AsyncHandler, Bus, Message, TypeTagged,
+};
+use messagebus_remote::relays::TcpRelay;
+use serde_derive::{Deserialize, Serialize};
+use thiserror::Error;
+
+#[derive(Debug, Error, MbError)]
+enum Error {
+    #[error("Error({0})")]
+    Error(anyhow::Error),
+}
+
+impl<M: Message> From<error::Error<M>> for Error {
+    fn from(err: error::Error<M>) -> Self {
+        Self::Error(err.into())
+    }
+}
+
+#[derive(Serialize, Deserialize, Debug, Clone, Message)]
+#[namespace("example")]
+#[message(shared, clone)]
+pub struct Req {
+    data: i32,
+    text: String,
+}
+
+#[derive(Serialize, Deserialize, Debug, Clone, Message)]
+#[namespace("example")]
+#[message(shared, clone)]
+pub struct Resp {
+    data: i32,
+    text: String,
+}
+
+struct TmpReceiver;
+
+#[async_trait]
+impl AsyncHandler<Req> for TmpReceiver {
+    type Error = Error;
+    type Response = Resp;
+
+    async fn handle(&self, msg: Req, _bus: &Bus) -> Result<Self::Response, Self::Error> {
+        println!("TmpReceiver::handle {:?}", msg);
+        Ok(Resp {
+            data: msg.data + 12,
+            text: format!("<< {} >>", msg.text),
+        })
+    }
+
+    async fn sync(&self, _bus: &Bus) -> Result<(), Self::Error> {
+        println!("TmpReceiver::sync");
+        Ok(())
+    }
+}
+
+#[tokio::main]
+async fn main() {
+    let relay = TcpRelay::new(
+        true,
+        "0.0.0.0:8083".parse().unwrap(),
+        (
+            vec![],
+            vec![(
+                Req::type_tag_(),
+                Some((Resp::type_tag_(), GenericError::type_tag_())),
+            )],
+        ),
+    );
+
+    let (b, poller) = Bus::build()
+        .register_relay(relay)
+        .register(TmpReceiver)
+        .subscribe_async::<Req>(8, Default::default())
+        .done()
+        .build();
+
+    b.ready().await;
+
+    println!("ready");
+
+    poller.await;
+}

crates/remote/src/error.rs

@@ -0,0 +1,45 @@
+use quinn::{ConnectError, ConnectionError, EndpointError, ParseError, ReadToEndError, WriteError};
+
+#[derive(Debug, thiserror::Error)]
+pub enum Error {
+    #[error("IO Error: {0}")]
+    Io(#[from] std::io::Error),
+
+    // #[error("ReadToEnd: {0}")]
+    // ReadToEnd(#[from] ReadToEndError),
+    #[error("ConnectionError: {0}")]
+    ConnectionError(#[from] ConnectionError),
+
+    #[error("ConnectError: {0}")]
+    ConnectError(#[from] ConnectError),
+
+    #[error("EndpointError: {0}")]
+    EndpointError(#[from] EndpointError),
+
+    #[error("WriteError: {0}")]
+    WriteError(#[from] WriteError),
+
+    #[error("ReadToEndError: {0}")]
+    ReadToEndError(#[from] ReadToEndError),
+
+    #[error("QuinnConnectError: {0}")]
+    QuinnParseError(#[from] ParseError),
+
+    #[error("ConfigError: {0}")]
+    ConfigError(#[from] quinn_proto::ConfigError),
+
+    #[error("TLSError: {0}")]
+    TLSError(#[from] rustls::TLSError),
+
+    #[error("Redis: {0}")]
+    Redis(#[from] redis::RedisError),
+
+    #[error("ProtocolParseError {0}")]
+    ProtocolParseError(String),
+
+    #[error("UnknownCodec")]
+    UnknownCodec,
+
+    #[error("SerdeErased {0}")]
+    SerdeErased(#[from] erased_serde::Error),
+}

crates/remote/src/lib.rs

@@ -0,0 +1,3 @@
+pub mod error;
+pub mod proto;
+pub mod relays;

crates/remote/src/proto.rs

@@ -0,0 +1,530 @@
+use messagebus::{Action, Bus, Event, SharedMessage, TypeTag};
+use serde_derive::{Deserialize, Serialize};
+use std::borrow::Cow;
+
+#[derive(Debug, Deserialize, Serialize)]
+#[repr(u16)]
+pub enum ProtocolHeaderActionKind {
+    Nop,
+    Error,
+
+    Send,
+    Response,
+    BatchComplete,
+
+    Flush,
+    Flushed,
+
+    Synchronize,
+    Synchronized,
+
+    Close,
+    Exited,
+
+    Initialize,
+    Ready,
+
+    Pause,
+}
+
+#[derive(Debug, Copy, Clone, Deserialize, Serialize)]
+#[non_exhaustive]
+#[repr(u32)]
+pub enum BodyType {
+    None,
+    Utf8,
+    Cbor,
+    MessagePack,
+    Json,
+    Bson,
+}
+
+bitflags::bitflags! {
+    #[derive(Deserialize, Serialize)]
+    pub struct ProtocolHeaderFlags: u32 {
+        const TYPE_TAG = 0b00000001;
+        const BODY     = 0b00000010;
+        const ERROR    = 0b00000100;
+        const ARGUMENT = 0b00001000;
+        const TT_AND_ERROR = Self::TYPE_TAG.bits | Self::ERROR.bits;
+        const TT_AND_BODY =  Self::TYPE_TAG.bits | Self::BODY.bits;
+        const TT_ERROR_AND_ARGUMENT = Self::TYPE_TAG.bits | Self::ERROR.bits | Self::ARGUMENT.bits;
+        const TT_BODY_AND_ARGUMENT =  Self::TYPE_TAG.bits | Self::BODY.bits | Self::ARGUMENT.bits;
+    }
+}
+
+#[derive(Debug, Deserialize, Serialize)]
+pub struct ProtocolHeader<'a> {
+    pub kind: ProtocolHeaderActionKind,
+    pub type_tag: Option<Cow<'a, [u8]>>,
+    pub flags: ProtocolHeaderFlags,
+    pub body_type: BodyType,
+    pub argument: u64,
+}
+
+impl<'a> ProtocolHeader<'a> {
+    pub fn send(mid: u64, tt: &'a TypeTag, body_type: BodyType) -> ProtocolHeader<'a> {
+        ProtocolHeader {
+            kind: ProtocolHeaderActionKind::Send,
+            type_tag: Some(tt.as_bytes().into()),
+            flags: ProtocolHeaderFlags::TT_BODY_AND_ARGUMENT,
+            body_type,
+            argument: mid,
+        }
+    }
+
+    pub fn flush() -> Self {
+        ProtocolHeader {
+            kind: ProtocolHeaderActionKind::Flush,
+            type_tag: None,
+            flags: ProtocolHeaderFlags::empty(),
+            body_type: BodyType::None,
+            argument: 0,
+        }
+    }
+
+    pub fn close() -> Self {
+        ProtocolHeader {
+            kind: ProtocolHeaderActionKind::Close,
+            type_tag: None,
+            flags: ProtocolHeaderFlags::empty(),
+            body_type: BodyType::None,
+            argument: 0,
+        }
+    }
+
+    pub fn sync() -> Self {
+        ProtocolHeader {
+            kind: ProtocolHeaderActionKind::Synchronize,
+            type_tag: None,
+            flags: ProtocolHeaderFlags::empty(),
+            body_type: BodyType::None,
+            argument: 0,
+        }
+    }
+
+    // pub fn init() -> Self {
+    //     ProtocolHeader {
+    //         kind: ProtocolHeaderActionKind::Initialize,
+    //         type_tag: None,
+    //         failed: false,
+    //         body_encoding: 0,
+    //         argument: 0,
+    //     }
+    // }
+
+    // pub fn pause() -> Self {
+    //     ProtocolHeader {
+    //         kind: ProtocolHeaderActionKind::Pause,
+    //         type_tag: None,
+    //         failed: false,
+    //         body_encoding: 0,
+    //         argument: 0,
+    //     }
+    // }
+}
+
+#[derive(Debug)]
+pub enum ProtocolItem {
+    Nop,
+    Event(Event<Box<dyn SharedMessage>, messagebus::error::GenericError>),
+    Action(Action),
+    Send(u64, Box<dyn SharedMessage>, bool),
+}
+
+impl From<Action> for ProtocolItem {
+    fn from(action: Action) -> Self {
+        ProtocolItem::Action(action)
+    }
+}
+
+impl From<Event<Box<dyn SharedMessage>, messagebus::error::GenericError>> for ProtocolItem {
+    fn from(ev: Event<Box<dyn SharedMessage>, messagebus::error::GenericError>) -> Self {
+        ProtocolItem::Event(ev)
+    }
+}
+
+impl From<(u64, Box<dyn SharedMessage>, bool)> for ProtocolItem {
+    fn from(msg: (u64, Box<dyn SharedMessage>, bool)) -> Self {
+        ProtocolItem::Send(msg.0, msg.1, msg.2)
+    }
+}
+
+impl ProtocolItem {
+    pub fn unwrap_send(self) -> Result<(u64, Box<dyn SharedMessage>, bool), ProtocolItem> {
+        match self {
+            ProtocolItem::Send(a, b, c) => Ok((a, b, c)),
+            other => Err(other),
+        }
+    }
+
+    pub fn serialize<'a>(
+        &self,
+        mut body_type: BodyType,
+        body_buff: &'a mut Vec<u8>,
+    ) -> Result<ProtocolPacket<'a>, crate::error::Error> {
+        let mut argument = 0;
+        let mut type_tag = None;
+        let mut body = None;
+        let mut flags = ProtocolHeaderFlags::empty();
+
+        let kind = match self {
+            ProtocolItem::Nop => ProtocolHeaderActionKind::Nop,
+            ProtocolItem::Action(action) => match action {
+                Action::Close => ProtocolHeaderActionKind::Close,
+                Action::Flush => ProtocolHeaderActionKind::Flush,
+                Action::Init(..) => ProtocolHeaderActionKind::Initialize,
+                Action::Sync => ProtocolHeaderActionKind::Synchronize,
+                _ => unimplemented!(),
+            },
+            ProtocolItem::Send(mid, msg, req) => {
+                let msg = msg
+                    .as_shared_ref()
+                    .ok_or(crate::error::Error::UnknownCodec)?;
+
+                argument = *mid;
+                flags.set(ProtocolHeaderFlags::ARGUMENT, *req);
+                flags.set(ProtocolHeaderFlags::BODY, true);
+                flags.set(ProtocolHeaderFlags::TYPE_TAG, true);
+                type_tag = Some(msg.type_tag());
+                body = Some(generic_serialize(body_type, &*msg, body_buff)?);
+
+                ProtocolHeaderActionKind::Send
+            }
+            ProtocolItem::Event(ev) => match ev {
+                Event::Response(mid, res) => {
+                    argument = *mid;
+                    flags.set(ProtocolHeaderFlags::ARGUMENT, true);
+                    flags.set(ProtocolHeaderFlags::BODY, true);
+                    flags.set(ProtocolHeaderFlags::TYPE_TAG, true);
+
+                    match res {
+                        Ok(msg) => {
+                            let msg = msg
+                                .as_shared_ref()
+                                .ok_or(crate::error::Error::UnknownCodec)?;
+
+                            type_tag = Some(msg.type_tag());
+                            body = Some(generic_serialize(body_type, &*msg, body_buff)?);
+                        }
+
+                        Err(err) => {
+                            flags.set(ProtocolHeaderFlags::ERROR, true);
+
+                            type_tag = Some("GenericError".into());
+                            body_type = BodyType::Utf8;
+                            body = Some(format!("{}", err).into_bytes().into());
+                        }
+                    }
+
+                    ProtocolHeaderActionKind::Response
+                }
+                Event::Error(err) => {
+                    flags.set(ProtocolHeaderFlags::ERROR, true);
+                    flags.set(ProtocolHeaderFlags::BODY, true);
+                    flags.set(ProtocolHeaderFlags::TYPE_TAG, true);
+
+                    type_tag = Some("GenericError".into());
+                    body_type = BodyType::Utf8;
+                    body = Some(format!("{}", err).into_bytes().into());
+
+                    ProtocolHeaderActionKind::Error
+                }
+                Event::BatchComplete(tt, n) => {
+                    argument = *n;
+                    type_tag = Some(tt.clone());
+                    flags.set(ProtocolHeaderFlags::TYPE_TAG, true);
+                    flags.set(ProtocolHeaderFlags::ARGUMENT, true);
+                    ProtocolHeaderActionKind::BatchComplete
+                }
+                Event::Synchronized(res) => {
+                    match res {
+                        Ok(_) => {}
+                        Err(err) => {
+                            flags.set(ProtocolHeaderFlags::BODY, true);
+                            flags.set(ProtocolHeaderFlags::ERROR, true);
+                            flags.set(ProtocolHeaderFlags::TYPE_TAG, true);
+
+                            type_tag = Some("GenericError".into());
+                            body_type = BodyType::Utf8;
+                            body = Some(format!("{}", err).into_bytes().into());
+                        }
+                    }
+                    ProtocolHeaderActionKind::Synchronized
+                }
+                Event::InitFailed(err) => {
+                    flags.set(ProtocolHeaderFlags::BODY, true);
+                    flags.set(ProtocolHeaderFlags::ERROR, true);
+                    flags.set(ProtocolHeaderFlags::TYPE_TAG, true);
+
+                    type_tag = Some("GenericError".into());
+                    body_type = BodyType::Utf8;
+                    body = Some(format!("{}", err).into_bytes().into());
+
+                    ProtocolHeaderActionKind::Ready
+                }
+                Event::Ready => ProtocolHeaderActionKind::Ready,
+                Event::Pause => ProtocolHeaderActionKind::Pause,
+                Event::Exited => ProtocolHeaderActionKind::Exited,
+                Event::Flushed => ProtocolHeaderActionKind::Flushed,
+                _ => unimplemented!(),
+            },
+        };
+
+        Ok(ProtocolPacket {
+            header: ProtocolHeader {
+                kind,
+                type_tag: type_tag.map(|x| x.to_string().into_bytes().into()),
+                flags,
+                body_type,
+                argument,
+            },
+            body,
+        })
+    }
+}
+
+#[derive(Debug, Deserialize, Serialize)]
+pub struct ProtocolPacket<'a> {
+    pub header: ProtocolHeader<'a>,
+    pub body: Option<Cow<'a, [u8]>>,
+}
+
+impl<'a> ProtocolPacket<'a> {
+    pub fn deserialize(self, _bus: &Bus) -> Result<ProtocolItem, crate::error::Error> {
+        let type_tag: Option<TypeTag> = if self.header.flags.contains(ProtocolHeaderFlags::TYPE_TAG)
+        {
+            self.header
+                .type_tag
+                .map(|x| String::from_utf8_lossy(x.as_ref()).to_string().into())
+        } else {
+            None
+        };
+
+        let (body, error) = if self.header.flags.contains(ProtocolHeaderFlags::ERROR) {
+            let error = messagebus::error::GenericError {
+                type_tag: type_tag.clone().unwrap(),
+                description: self
+                    .body
+                    .map(|x| String::from_utf8_lossy(x.as_ref()).to_string())
+                    .unwrap_or_default(),
+            };
+
+            (None, Some(messagebus::error::Error::Other(error)))
+        } else if self.header.flags.contains(ProtocolHeaderFlags::TT_AND_BODY) {
+            let body = self
+                .body
+                .ok_or_else(|| crate::error::Error::ProtocolParseError("No body".to_string()))?;
+            let res = generic_deserialize(self.header.body_type, body.as_ref(), |de| {
+                messagebus::deserialize_shared_message(type_tag.clone().unwrap(), de)
+                    .map_err(|x| x.map_msg(|_| ()))
+            })?;
+
+            match res {
+                Ok(body) => (Some(body), None),
+                Err(err) => (None, Some(err)),
+            }
+        } else {
+            (None, None)
+        };
+
+        let argument = if self.header.flags.contains(ProtocolHeaderFlags::ARGUMENT) {
+            Some(self.header.argument)
+        } else {
+            None
+        };
+
+        Ok(ProtocolItem::Event(match self.header.kind {
+            ProtocolHeaderActionKind::Response => Event::Response(
+                argument.ok_or_else(|| {
+                    crate::error::Error::ProtocolParseError(
+                        "Event::Response expected argument".into(),
+                    )
+                })?,
+                error.map(Err).or_else(|| body.map(Ok)).ok_or_else(|| {
+                    crate::error::Error::ProtocolParseError("Event::Response expected body".into())
+                })?,
+            ),
+            ProtocolHeaderActionKind::Synchronized => {
+                Event::Synchronized(error.map(Err).unwrap_or(Ok(())))
+            }
+            ProtocolHeaderActionKind::Error => Event::Error(error.ok_or_else(|| {
+                crate::error::Error::ProtocolParseError("Event::Error expected body".into())
+            })?),
+            ProtocolHeaderActionKind::BatchComplete => {
+                Event::BatchComplete(type_tag.unwrap(), self.header.argument)
+            }
+            ProtocolHeaderActionKind::Flushed => Event::Flushed,
+            ProtocolHeaderActionKind::Exited => Event::Exited,
+            ProtocolHeaderActionKind::Ready => Event::Ready,
+            ProtocolHeaderActionKind::Pause => Event::Pause,
+
+            other => {
+                return Ok(ProtocolItem::Action(match other {
+                    ProtocolHeaderActionKind::Initialize => Action::Init(self.header.argument),
+                    ProtocolHeaderActionKind::Close => Action::Close,
+                    ProtocolHeaderActionKind::Flush => Action::Flush,
+                    ProtocolHeaderActionKind::Synchronize => Action::Sync,
+                    ProtocolHeaderActionKind::Send => {
+                        let req = argument.is_some();
+                        let mid = self.header.argument;
+                        let body = body.ok_or_else(|| {
+                            crate::error::Error::ProtocolParseError(format!(
+                                "Action::Send[{:?}] expected body",
+                                type_tag
+                            ))
+                        })?;
+
+                        return Ok(ProtocolItem::Send(mid, body, req));
+                    }
+                    ProtocolHeaderActionKind::Nop => return Ok(ProtocolItem::Nop),
+
+                    _ => unreachable!(),
+                }))
+            }
+        }))
+    }
+}
+
+fn generic_deserialize<F, T>(k: BodyType, data: &[u8], f: F) -> Result<T, crate::error::Error>
+where
+    F: FnOnce(&mut dyn erased_serde::Deserializer<'_>) -> T,
+{
+    match k {
+        BodyType::Cbor => {
+            let mut cbor_de = serde_cbor::Deserializer::from_slice(data);
+            let mut de = <dyn erased_serde::Deserializer>::erase(&mut cbor_de);
+
+            Ok(f(&mut de))
+        }
+
+        BodyType::Json => {
+            let mut json_de = serde_json::Deserializer::from_slice(data);
+            let mut de = <dyn erased_serde::Deserializer>::erase(&mut json_de);
+
+            Ok(f(&mut de))
+        }
+
+        _ => Err(crate::error::Error::UnknownCodec),
+    }
+}
+
+fn generic_serialize<'a>(
+    kind: BodyType,
+    msg: &dyn SharedMessage,
+    buffer: &'a mut Vec<u8>,
+) -> Result<Cow<'a, [u8]>, crate::error::Error> {
+    match kind {
+        BodyType::Cbor => {
+            let mut cbor_se = serde_cbor::Serializer::new(&mut *buffer);
+            let mut se = <dyn erased_serde::Serializer>::erase(&mut cbor_se);
+            msg.erased_serialize(&mut se)?;
+        }
+
+        BodyType::Json => {
+            let mut json_se = serde_json::Serializer::new(&mut *buffer);
+            let mut se = <dyn erased_serde::Serializer>::erase(&mut json_se);
+            msg.erased_serialize(&mut se)?;
+        }
+
+        _ => return Err(crate::error::Error::UnknownCodec),
+    }
+
+    Ok(buffer.as_slice().into())
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::proto::ProtocolItem;
+
+    use super::{
+        BodyType, ProtocolHeader, ProtocolHeaderActionKind, ProtocolHeaderFlags, ProtocolPacket,
+    };
+    use messagebus::Event;
+    use messagebus::{derive::Message, Bus, TypeTagged};
+    use serde_derive::{Deserialize, Serialize};
+    use std::borrow::Cow;
+
+    #[derive(Serialize, Deserialize, Debug, Clone, Message)]
+    #[namespace("test")]
+    #[message(shared, clone)]
+    struct TestSharedMessage {
+        test: String,
+        value: i32,
+    }
+
+    #[test]
+    fn test_proto_pack_event() {
+        let (bus, _) = Bus::build().build();
+
+        let pkt = ProtocolPacket {
+            header: ProtocolHeader {
+                kind: ProtocolHeaderActionKind::Response,
+                type_tag: Some(TestSharedMessage::type_tag_().as_bytes().to_vec().into()),
+                flags: ProtocolHeaderFlags::TT_BODY_AND_ARGUMENT,
+                body_type: BodyType::Json,
+                argument: 222,
+            },
+            body: Some(Cow::Borrowed(br#"{"test":"my test","value":12}"#)),
+        };
+
+        let event = match pkt.deserialize(&bus).unwrap() {
+            ProtocolItem::Event(ev) => ev,
+            _ => unreachable!(),
+        };
+
+        assert!(matches!(event, Event::Response(..)));
+
+        match event {
+            Event::Response(mid, msg) => {
+                assert_eq!(mid, 222);
+                // assert!(msg.is_ok());
+                let msg = msg.unwrap();
+
+                assert_eq!(msg.type_tag(), TestSharedMessage::type_tag_());
+                let m: Box<TestSharedMessage> = msg.as_any_boxed().downcast().unwrap();
+
+                assert_eq!(m.value, 12);
+                assert_eq!(&m.test, "my test");
+            }
+            _ => unreachable!(),
+        }
+    }
+
+    #[test]
+    fn test_proto_pack_event_error() {
+        let (bus, _) = Bus::build().build();
+
+        let pkt = ProtocolPacket {
+            header: ProtocolHeader {
+                kind: ProtocolHeaderActionKind::Response,
+                type_tag: Some(TestSharedMessage::type_tag_().as_bytes().to_vec().into()),
+                flags: ProtocolHeaderFlags::TT_ERROR_AND_ARGUMENT,
+                body_type: BodyType::Utf8,
+                argument: 222,
+            },
+            body: Some(Cow::Borrowed(br#"error description"#)),
+        };
+
+        let event = match pkt.deserialize(&bus).unwrap() {
+            ProtocolItem::Event(ev) => ev,
+            _ => unreachable!(),
+        };
+
+        assert!(matches!(event, Event::Response(..)));
+
+        #[allow(clippy::unit_cmp)]
+        match event {
+            Event::Response(mid, msg) => {
+                assert_eq!(mid, 222);
+                let msg = msg.unwrap_err();
+
+                assert!(matches!(msg, messagebus::error::Error::Other(val) if (
+                    assert_eq!(val.type_tag, TestSharedMessage::type_tag_()) == () &&
+                    assert_eq!(val.description, "error description") == ()
+                )));
+            }
+            _ => unreachable!(),
+        }
+    }
+}

crates/remote/src/relays/mod.rs

@@ -0,0 +1,89 @@
+// #[cfg(feature = "quic")]
+mod quic;
+// mod redis;
+mod tcp;
+
+use futures::Stream;
+use messagebus::{error::GenericError, Event, Message, TypeTag};
+use std::{collections::HashMap, pin::Pin};
+
+// #[cfg(feature = "quic")]
+pub use quic::*;
+pub use tcp::*;
+
+pub(crate) type GenericEventStream =
+    Pin<Box<dyn Stream<Item = Event<Box<dyn Message>, GenericError>> + Send>>;
+
+#[derive(Debug, Default)]
+pub struct MessageTable {
+    table: HashMap<TypeTag, Vec<Option<(TypeTag, TypeTag)>>>,
+}
+
+impl MessageTable {
+    #[inline]
+    pub fn add_any(&mut self, req: TypeTag, resp_err: Option<(TypeTag, TypeTag)>) {
+        self.table
+            .entry(req)
+            .or_insert_with(Vec::new)
+            .push(resp_err);
+    }
+
+    #[inline]
+    pub fn add_request(&mut self, req: TypeTag, resp: TypeTag, err: TypeTag) {
+        self.add_any(req, Some((resp, err)));
+    }
+
+    #[inline]
+    pub fn add_message(&mut self, msg: TypeTag) {
+        self.add_any(msg, None);
+    }
+
+    pub fn iter_keys(&self) -> impl Iterator<Item = &str> + '_ {
+        self.table.keys().map(|k| k.as_ref())
+    }
+
+    #[inline]
+    pub fn accept_any(&self, msg: &TypeTag) -> bool {
+        self.table.contains_key(msg)
+    }
+
+    #[inline]
+    pub fn accept_message(&self, msg: &TypeTag) -> bool {
+        self.table
+            .get(msg)
+            .map_or(false, |v| v.iter().any(Option::is_none))
+    }
+
+    pub fn accept_request(
+        &self,
+        msg: &TypeTag,
+        resp: Option<&TypeTag>,
+        err: Option<&TypeTag>,
+    ) -> bool {
+        self.table.get(msg).map_or(false, |v| {
+            v.iter().filter_map(Option::as_ref).any(|(r, e)| {
+                resp.map_or(true, |resp| resp.as_ref() == r.as_ref())
+                    && err.map_or(true, |err| err.as_ref() == e.as_ref())
+            })
+        })
+    }
+
+    pub fn iter_types(
+        &self,
+    ) -> impl Iterator<Item = (&'_ TypeTag, Option<&'_ (TypeTag, TypeTag)>)> + '_ {
+        self.table
+            .iter()
+            .map(|(k, v)| v.iter().map(move |resp| (k, resp.as_ref())))
+            .flatten()
+    }
+}
+
+impl From<Vec<(TypeTag, Option<(TypeTag, TypeTag)>)>> for MessageTable {
+    fn from(table: Vec<(TypeTag, Option<(TypeTag, TypeTag)>)>) -> Self {
+        let mut outgoing_table = MessageTable::default();
+        for (key, val) in table {
+            outgoing_table.add_any(key, val);
+        }
+        outgoing_table
+    }
+}

crates/remote/src/relays/quic/client.rs

@@ -0,0 +1,56 @@
+use crate::error::Error;
+use futures::{Future, Stream};
+use quinn::Connecting;
+use std::{
+    net::SocketAddr,
+    pin::Pin,
+    task::{Context, Poll},
+};
+
+use super::WaitIdle;
+
+pub struct QuicClientEndpoint {
+    addr: SocketAddr,
+    host: String,
+    endpoint: quinn::Endpoint,
+}
+
+impl QuicClientEndpoint {
+    pub fn new(cert: &str, addr: SocketAddr, host: String) -> Result<Self, Error> {
+        let mut client_config = quinn::ClientConfigBuilder::default();
+        client_config.protocols(super::ALPN_QUIC_HTTP);
+        client_config.enable_keylog();
+
+        let cert_der = std::fs::read(cert)?;
+        let cert = quinn::Certificate::from_der(&cert_der)?;
+
+        client_config.add_certificate_authority(cert).unwrap();
+
+        let mut endpoint = quinn::Endpoint::builder();
+        endpoint.default_client_config(client_config.build());
+
+        let (endpoint, _) = endpoint.bind(&"0.0.0.0:0".parse().unwrap())?;
+
+        Ok(Self {
+            addr,
+            host,
+            endpoint,
+        })
+    }
+}
+
+impl Stream for QuicClientEndpoint {
+    type Item = Connecting;
+
+    fn poll_next(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
+        let this = self.get_mut();
+        Poll::Ready(this.endpoint.connect(&this.addr, &this.host).ok())
+    }
+}
+
+impl<'a> WaitIdle<'a> for QuicClientEndpoint {
+    type Fut = Pin<Box<dyn Future<Output = ()> + Send + 'a>>;
+    fn wait_idle(&'a self) -> Self::Fut {
+        Box::pin(self.endpoint.wait_idle())
+    }
+}

crates/remote/src/relays/quic/mod.rs

@@ -0,0 +1,489 @@
+mod client;
+mod server;
+
+use std::net::SocketAddr;
+use std::sync::atomic::{AtomicU64, Ordering};
+use std::sync::Arc;
+
+use bytes::{Buf, BufMut};
+pub use client::QuicClientEndpoint;
+use futures::{pin_mut, Future, Stream, StreamExt};
+use messagebus::error::GenericError;
+use messagebus::{
+    Action, Bus, Event, EventBoxed, Message, ReciveUntypedReceiver, SendOptions,
+    SendUntypedReceiver, TypeTag, TypeTagAccept, TypeTagAcceptItem,
+};
+use parking_lot::Mutex;
+use quinn::{Connecting, IncomingBiStreams};
+pub use server::QuicServerEndpoint;
+use tokio::sync::mpsc::{self, UnboundedReceiver, UnboundedSender};
+
+pub const ALPN_QUIC_HTTP: &[&[u8]] = &[b"hq-29"];
+
+use crate::proto::{BodyType, ProtocolItem, ProtocolPacket};
+
+pub type QuicClientRelay = QuicRelay<QuicClientEndpoint>;
+pub type QuicServerRelay = QuicRelay<QuicServerEndpoint>;
+
+use super::{GenericEventStream, MessageTable};
+pub type MessageList = Vec<(TypeTag, Option<(TypeTag, TypeTag)>)>;
+
+pub trait WaitIdle<'a>: Sync {
+    type Fut: Future + Send + 'a;
+    fn wait_idle(&'a self) -> Self::Fut;
+}
+
+pub struct QuicRelay<B> {
+    base: Mutex<Option<B>>,
+    self_id: Arc<AtomicU64>,
+    in_table: MessageTable,
+    _out_table: MessageTable,
+
+    item_sender: UnboundedSender<Option<ProtocolItem>>,
+    item_receiver: Mutex<Option<UnboundedReceiver<Option<ProtocolItem>>>>,
+
+    event_sender: UnboundedSender<EventBoxed<GenericError>>,
+    event_receiver: Mutex<Option<UnboundedReceiver<EventBoxed<GenericError>>>>,
+
+    stream_sender: UnboundedSender<IncomingBiStreams>,
+    stream_receiver: Mutex<Option<UnboundedReceiver<IncomingBiStreams>>>,
+}
+
+impl QuicRelay<QuicClientEndpoint> {
+    pub fn new(
+        cert: &str,
+        addr: SocketAddr,
+        host: String,
+        table: (MessageList, MessageList),
+    ) -> Result<Self, crate::error::Error> {
+        let (item_sender, item_receiver) = mpsc::unbounded_channel();
+        let (event_sender, event_receiver) = mpsc::unbounded_channel();
+        let (stream_sender, stream_receiver) = mpsc::unbounded_channel();
+
+        Ok(QuicRelay {
+            base: Mutex::new(Some(QuicClientEndpoint::new(cert, addr, host)?)),
+            self_id: Arc::new(AtomicU64::new(0)),
+            in_table: MessageTable::from(table.0),
+            _out_table: MessageTable::from(table.1),
+            item_sender,
+            item_receiver: Mutex::new(Some(item_receiver)),
+            event_sender,
+            event_receiver: Mutex::new(Some(event_receiver)),
+            stream_sender,
+            stream_receiver: Mutex::new(Some(stream_receiver)),
+        })
+    }
+}
+
+impl QuicRelay<QuicServerEndpoint> {
+    pub fn new(
+        key_path: &str,
+        cert_path: &str,
+        addr: SocketAddr,
+        table: (MessageList, MessageList),
+    ) -> Result<Self, crate::error::Error> {
+        let (item_sender, item_receiver) = mpsc::unbounded_channel();
+        let (event_sender, event_receiver) = mpsc::unbounded_channel();
+        let (stream_sender, stream_receiver) = mpsc::unbounded_channel();
+
+        Ok(QuicRelay {
+            base: Mutex::new(Some(QuicServerEndpoint::new(key_path, cert_path, &addr)?)),
+            self_id: Arc::new(AtomicU64::new(0)),
+            in_table: MessageTable::from(table.0),
+            _out_table: MessageTable::from(table.1),
+            item_sender,
+            item_receiver: Mutex::new(Some(item_receiver)),
+            event_sender,
+            event_receiver: Mutex::new(Some(event_receiver)),
+            stream_sender,
+            stream_receiver: Mutex::new(Some(stream_receiver)),
+        })
+    }
+}
+
+impl<B> TypeTagAccept for QuicRelay<B>
+where
+    B: Stream<Item = Connecting> + Send + 'static,
+{
+    fn iter_types(&self) -> Box<dyn Iterator<Item = TypeTagAcceptItem> + '_> {
+        let iter = self.in_table.iter_types();
+        Box::new(iter.map(|(x, y)| (x.clone(), y.cloned())))
+    }
+
+    fn accept_msg(&self, msg: &TypeTag) -> bool {
+        self.in_table.accept_message(msg)
+    }
+
+    fn accept_req(&self, req: &TypeTag, resp: Option<&TypeTag>, err: Option<&TypeTag>) -> bool {
+        self.in_table.accept_request(req, resp, err)
+    }
+}
+
+impl<B> SendUntypedReceiver for QuicRelay<B>
+where
+    B: for<'a> WaitIdle<'a> + Stream<Item = Connecting> + Send + 'static,
+{
+    fn send(&self, msg: Action, _bus: &Bus) -> Result<(), messagebus::error::Error<Action>> {
+        match msg {
+            Action::Init(self_id) => {
+                let mut rx = match self.item_receiver.lock().take() {
+                    Some(x) => x,
+                    None => return Ok(()),
+                };
+
+                let stream_sender = self.stream_sender.clone();
+                let event_sender = self.event_sender.clone();
+
+                let incoming = self.base.lock().take().unwrap();
+                self.self_id.store(self_id, Ordering::SeqCst);
+
+                tokio::spawn(async move {
+                    pin_mut!(incoming);
+
+                    let mut body_buff = Vec::new();
+                    let mut header_buff = Vec::new();
+                    let mut item = None;
+
+                    loop {
+                        println!("begin");
+
+                        let conn = match incoming.next().await {
+                            Some(x) => x,
+                            None => {
+                                println!("No more connections. Message {:?} has been lost!", item);
+                                break;
+                            }
+                        };
+
+                        let conn = match conn.await {
+                            Ok(conn) => conn,
+                            Err(err) => {
+                                println!(
+                                    "connection dropped with err {}. waiting next connection",
+                                    err
+                                );
+                                continue;
+                            }
+                        };
+
+                        stream_sender.send(conn.bi_streams).unwrap();
+                        event_sender.send(Event::Ready).unwrap();
+
+                        loop {
+                            let r = if let Some(r) = item.take() {
+                                r
+                            } else {
+                                match rx.recv().await {
+                                    Some(Some(r)) => r,
+                                    None | Some(None) => {
+                                        println!("closing");
+                                        conn.connection.close(0u32.into(), b"done");
+                                        incoming.wait_idle().await;
+                                        break;
+                                    }
+                                }
+
+                                // match tokio::time::timeout(Duration::from_secs(5), rx.recv()).await {
+                                //     Ok(Some(Some(r))) => r,
+                                //     Ok(None) | Ok(Some(None)) => {
+                                //         conn.connection.close(0u32.into(), b"done");
+                                //         incoming.wait_idle().await;
+                                //         break;
+                                //     },
+                                //     Err(_) => {
+                                //         // println!("{:?}", err);
+                                //         // let (mut send, _) = match conn.connection.open_bi().await {
+                                //         //     Ok(x) => x,
+                                //         //     Err(err) => {
+                                //         //         println!("err {}", err);
+                                //         //         break;
+                                //         //     }
+                                //         // };
+                                //         // println!("<< PING");
+                                //         // let _ = send.write_all(b"PING").await.unwrap();
+                                //         // let _ = send.finish().await;
+                                //         continue;
+                                //     }
+                                // }
+                            };
+
+                            let (mut send, _) = match conn.connection.open_bi().await {
+                                Ok(x) => x,
+                                Err(err) => {
+                                    println!("err {}", err);
+                                    break;
+                                }
+                            };
+
+                            body_buff.clear();
+                            let pkt = r.serialize(BodyType::Cbor, &mut body_buff).unwrap();
+
+                            header_buff.resize(16, 0);
+                            serde_cbor::to_writer(&mut header_buff, &pkt).unwrap();
+                            let body_size = header_buff.len() - 16;
+
+                            let mut head = &mut header_buff[0..16];
+
+                            head.put(&b"MBUS"[..]);
+                            head.put_u16(1);
+                            head.put_u16(0);
+                            head.put_u64(body_size as _);
+
+                            if let Err(err) = send.write_all(&header_buff).await {
+                                item = Some(r);
+                                println!(
+                                    "write broken connection err {}. try with next connection",
+                                    err
+                                );
+                                break;
+                            }
+
+                            if let Err(err) = send.finish().await {
+                                item = Some(r);
+                                println!(
+                                    "finish broken connection err {}. try with next connection",
+                                    err
+                                );
+                                break;
+                            }
+                        }
+
+                        event_sender.send(Event::Pause).unwrap();
+                    }
+
+                    println!("exit main loop");
+                });
+            }
+
+            Action::Close => {
+                self.item_sender.send(None).unwrap();
+                self.event_sender.send(Event::Exited).unwrap();
+            }
+
+            other => self.item_sender.send(Some(other.into())).unwrap(),
+        }
+
+        Ok(())
+    }
+
+    fn send_msg(
+        &self,
+        mid: u64,
+        msg: Box<dyn Message>,
+        req: bool,
+        _bus: &Bus,
+    ) -> Result<(), messagebus::error::Error<Box<dyn Message>>> {
+        match msg.as_shared_boxed() {
+            Ok(msg) => {
+                if let Err(err) = self.item_sender.send(Some((mid, msg, req).into())) {
+                    Err(messagebus::error::Error::TryAgain(
+                        err.0.unwrap().unwrap_send().unwrap().1.upcast_box(),
+                    ))
+                } else {
+                    Ok(())
+                }
+            }
+
+            Err(msg) => Err(messagebus::error::Error::TryAgain(msg)),
+        }
+    }
+}
+
+impl<B> ReciveUntypedReceiver for QuicRelay<B>
+where
+    B: Send,
+{
+    type Stream = GenericEventStream;
+
+    fn event_stream(&self, bus: Bus) -> Self::Stream {
+        let self_id = self.self_id.clone();
+
+        let mut recv_stream = self.stream_receiver.lock().take().unwrap();
+        let mut recv_events = self.event_receiver.lock().take().unwrap();
+        let sender = self.item_sender.clone();
+
+        let stream1 = futures::stream::poll_fn(move |cx| recv_stream.poll_recv(cx))
+            .map(move |incoming| {
+                let buff: Vec<u8> = Vec::with_capacity(1024);
+                let bus = bus.clone();
+                let self_id = self_id.clone();
+                let sender = sender.clone();
+
+                futures::stream::unfold(
+                    (incoming, bus, sender, self_id, buff),
+                    |(mut incoming, bus, sender, self_id, mut buff)| async move {
+                        loop {
+                            let (_, mut recv) = match incoming.next().await? {
+                                Ok(recv) => recv,
+                                Err(err) => {
+                                    println!("error: {}", err);
+                                    return None;
+                                }
+                            };
+
+                            buff.resize(4, 0);
+                            if let Err(err) = recv.read_exact(&mut buff[..]).await {
+                                println!("recv err: {}", err);
+                                continue;
+                            }
+
+                            let verb = match std::str::from_utf8(&buff[0..4]) {
+                                Ok(m) => m,
+                                Err(err) => {
+                                    println!("recv err parse: {}", err);
+                                    continue;
+                                }
+                            };
+
+                            if verb == "PING" {
+                                println!(">> PING");
+                                continue;
+                            }
+
+                            if verb != "MBUS" {
+                                println!("Not MBUS packet!");
+                                continue;
+                            }
+
+                            buff.resize(12, 0);
+                            if let Err(err) = recv.read_exact(&mut buff[..]).await {
+                                println!("recv err: {}", err);
+                                continue;
+                            }
+
+                            let mut reader = &buff[..];
+                            let _version = reader.get_u16();
+                            let content_type = reader.get_u16();
+                            let body_size = reader.get_u64();
+
+                            buff.resize(body_size as _, 0);
+                            if let Err(err) = recv.read_exact(&mut buff[..]).await {
+                                println!("recv err: {}", err);
+                                continue;
+                            }
+
+                            drop(recv);
+
+                            // println!("inbound packet MBUS v: {}; ct: {}; bs: {}",
+                            //     version, content_type, body_size);
+
+                            let event = match content_type {
+                                0 => {
+                                    // CBOR
+                                    let proto: ProtocolPacket =
+                                        match serde_cbor::from_slice(&buff[..]) {
+                                            Ok(val) => val,
+                                            Err(err) => {
+                                                println!("pkt parse err: {}", err);
+                                                continue;
+                                            }
+                                        };
+
+                                    let item: ProtocolItem = match proto.deserialize(&bus) {
+                                        Ok(val) => val,
+                                        Err(err) => {
+                                            println!("item parse err: {}", err);
+                                            continue;
+                                        }
+                                    };
+
+                                    match item {
+                                        ProtocolItem::Event(ev) => {
+                                            ev.map_msg(|msg| msg.upcast_box())
+                                        }
+                                        ProtocolItem::Action(action) => {
+                                            match action {
+                                                Action::Close => {
+                                                    println!("warning: Close recevied - ignoring!");
+                                                    sender
+                                                        .send(Some(ProtocolItem::Event(
+                                                            Event::Exited,
+                                                        )))
+                                                        .unwrap();
+                                                }
+                                                Action::Flush => {
+                                                    println!("flush");
+                                                    bus.flush_all().await;
+                                                    sender
+                                                        .send(Some(ProtocolItem::Event(
+                                                            Event::Flushed,
+                                                        )))
+                                                        .unwrap();
+                                                }
+                                                Action::Sync => {
+                                                    println!("flush");
+                                                    bus.sync_all().await;
+                                                    sender
+                                                        .send(Some(ProtocolItem::Event(
+                                                            Event::Synchronized(Ok(())),
+                                                        )))
+                                                        .unwrap();
+                                                }
+                                                Action::Init(..) => (),
+                                                Action::Stats => (),
+                                                _ => (),
+                                            }
+                                            continue;
+                                        }
+                                        ProtocolItem::Send(mid, msg, req) => {
+                                            let self_id = self_id.clone();
+                                            let sender = sender.clone();
+                                            let bus = bus.clone();
+
+                                            let _ = tokio::spawn(async move {
+                                                if req {
+                                                    let res = bus
+                                                        .request_boxed(
+                                                            msg.upcast_box(),
+                                                            SendOptions::Except(
+                                                                self_id.load(Ordering::SeqCst),
+                                                            ),
+                                                        )
+                                                        .await
+                                                        .map(|x| x.as_shared_boxed().unwrap())
+                                                        .map_err(|x| x.map_msg(|_| ()));
+
+                                                    sender
+                                                        .send(Some(ProtocolItem::Event(
+                                                            Event::Response(mid, res),
+                                                        )))
+                                                        .unwrap();
+                                                } else {
+                                                    let tt = msg.type_tag();
+                                                    let _ = bus
+                                                        .send_boxed(
+                                                            msg.upcast_box(),
+                                                            Default::default(),
+                                                        )
+                                                        .await;
+
+                                                    sender
+                                                        .send(Some(ProtocolItem::Event(
+                                                            Event::BatchComplete(tt, 1),
+                                                        )))
+                                                        .unwrap();
+                                                }
+                                            });
+
+                                            continue;
+                                        }
+                                        _ => unimplemented!(),
+                                    }
+                                }
+                                _ => unimplemented!(),
+                            };
+
+                            return Some((event, (incoming, bus, sender, self_id, buff)));
+                        }
+                    },
+                )
+            })
+            .flatten();
+
+        let stream2 = futures::stream::poll_fn(move |cx| recv_events.poll_recv(cx));
+        Box::pin(
+            futures::stream::select(stream1, stream2)
+                .take_while(|x| futures::future::ready(!matches!(x, Event::Exited))),
+        )
+    }
+}

crates/remote/src/relays/quic/server.rs

@@ -0,0 +1,64 @@
+use crate::error::Error;
+use futures::{Future, Stream};
+use quinn::Connecting;
+use std::{
+    net::SocketAddr,
+    pin::Pin,
+    sync::Arc,
+    task::{Context, Poll},
+};
+
+use super::WaitIdle;
+
+pub struct QuicServerEndpoint {
+    endpoint: quinn::Endpoint,
+    incoming: quinn::Incoming,
+}
+
+impl QuicServerEndpoint {
+    pub fn new(key_path: &str, cert_path: &str, addr: &SocketAddr) -> Result<Self, Error> {
+        let mut transport_config = quinn::TransportConfig::default();
+        transport_config.max_concurrent_uni_streams(0)?;
+
+        let mut server_config = quinn::ServerConfig::default();
+        server_config.transport = Arc::new(transport_config);
+
+        let mut server_config = quinn::ServerConfigBuilder::new(server_config);
+
+        server_config.protocols(super::ALPN_QUIC_HTTP);
+        server_config.enable_keylog();
+
+        let key = std::fs::read(key_path)?;
+        let cert_der = std::fs::read(cert_path)?;
+
+        let key = quinn::PrivateKey::from_der(&key)?;
+        let cert_chain = quinn::Certificate::from_der(&cert_der)?;
+
+        let cert = quinn::CertificateChain::from_certs([cert_chain]);
+
+        server_config.certificate(cert, key)?;
+
+        let mut endpoint = quinn::Endpoint::builder();
+        endpoint.listen(server_config.build());
+
+        let (endpoint, incoming) = endpoint.bind(addr)?;
+
+        Ok(Self { endpoint, incoming })
+    }
+}
+
+impl Stream for QuicServerEndpoint {
+    type Item = Connecting;
+
+    fn poll_next(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
+        let this = self.get_mut();
+        unsafe { Pin::new_unchecked(&mut this.incoming) }.poll_next(cx)
+    }
+}
+
+impl<'a> WaitIdle<'a> for QuicServerEndpoint {
+    type Fut = Pin<Box<dyn Future<Output = ()> + Send + 'a>>;
+    fn wait_idle(&'a self) -> Self::Fut {
+        Box::pin(self.endpoint.wait_idle())
+    }
+}

crates/remote/src/relays/redis/mod.rs

@@ -0,0 +1,252 @@
+use std::sync::atomic::{AtomicU64, Ordering};
+use std::sync::Arc;
+
+use futures::StreamExt;
+use messagebus::{
+    Action, Bus, Event, Message, ReciveUntypedReceiver, SendUntypedReceiver, TypeTag, TypeTagAccept,
+};
+use parking_lot::Mutex;
+use tokio::sync::mpsc::{self, UnboundedReceiver, UnboundedSender};
+
+use super::{GenericEventStream, MessageTable};
+use crate::proto::{BodyType, ProtocolItem};
+use redis::AsyncCommands;
+
+#[derive(Debug)]
+enum RecvDo {
+    Ready,
+}
+
+pub struct RedisRelay {
+    client: Arc<redis::Client>,
+    self_id: Arc<AtomicU64>,
+    table: MessageTable,
+    item_sender: UnboundedSender<Option<ProtocolItem>>,
+    item_receiver: Mutex<Option<UnboundedReceiver<Option<ProtocolItem>>>>,
+    event_sender: UnboundedSender<RecvDo>,
+    event_receiver: Mutex<Option<UnboundedReceiver<RecvDo>>>,
+}
+
+impl RedisRelay {
+    pub fn new(
+        path: &str,
+        table: Vec<(TypeTag, Option<(TypeTag, TypeTag)>)>,
+    ) -> Result<Self, crate::error::Error> {
+        let client = redis::Client::open(path)?;
+
+        let (item_sender, item_receiver) = mpsc::unbounded_channel();
+        let (event_sender, event_receiver) = mpsc::unbounded_channel();
+
+        Ok(RedisRelay {
+            client: Arc::new(client),
+            self_id: Arc::new(AtomicU64::new(0)),
+            table: MessageTable::from(table),
+            item_sender,
+            item_receiver: Mutex::new(Some(item_receiver)),
+            event_sender,
+            event_receiver: Mutex::new(Some(event_receiver)),
+        })
+    }
+}
+
+impl TypeTagAccept for RedisRelay {
+    fn accept_msg(&self, msg: &TypeTag) -> bool {
+        self.table.accept_message(msg)
+    }
+
+    fn accept_req(&self, msg: &TypeTag, resp: Option<&TypeTag>, err: Option<&TypeTag>) -> bool {
+        self.table.accept_request(msg, resp, err)
+    }
+
+    fn iter_types(&self) -> Box<dyn Iterator<Item = (TypeTag, Option<(TypeTag, TypeTag)>)> + '_> {
+        let iter = self.table.iter_types();
+        Box::new(iter.map(|(x, y)| (x.clone(), y.cloned())))
+    }
+}
+
+impl SendUntypedReceiver for RedisRelay {
+    fn send(&self, msg: Action, _bus: &Bus) -> Result<(), messagebus::error::Error<Action>> {
+        match msg {
+            Action::Init(self_id) => {
+                let event_sender = self.event_sender.clone();
+                let mut rx = self.item_receiver.lock().take().unwrap();
+
+                let client = self.client.clone();
+                self.self_id.store(self_id, Ordering::SeqCst);
+
+                tokio::spawn(async move {
+                    let mut connection = client.get_tokio_connection().await.unwrap();
+                    let mut body_buff = Vec::new();
+                    let mut header_buff = Vec::new();
+                    // let mut item = None;
+
+                    event_sender.send(RecvDo::Ready).unwrap();
+
+                    while let Some(Some(item)) = rx.recv().await {
+                        header_buff.clear();
+                        body_buff.clear();
+
+                        let pkt = item.serialize(BodyType::Cbor, &mut body_buff).unwrap();
+
+                        serde_cbor::to_writer(&mut header_buff, &pkt).unwrap();
+
+                        let channel = match &item {
+                            ProtocolItem::Action(_) => "mbus_action".into(),
+                            ProtocolItem::Send(_, msg, _) => {
+                                format!("mbus_request::{}", msg.type_tag())
+                            }
+                            ProtocolItem::Event(_ev) => "mbus_response::".into(),
+                            _ => unreachable!(),
+                        };
+
+                        let () = connection.publish(channel, &header_buff).await.unwrap();
+                    }
+                });
+            }
+
+            Action::Close => {
+                self.item_sender.send(None).unwrap();
+                // self.event_sender.send(RecvDo::Closed).unwrap();
+            }
+
+            other => self.item_sender.send(Some(other.into())).unwrap(),
+        }
+
+        Ok(())
+    }
+
+    fn send_msg(
+        &self,
+        mid: u64,
+        msg: Box<dyn Message>,
+        req: bool,
+        _bus: &Bus,
+    ) -> Result<(), messagebus::error::Error<Box<dyn Message>>> {
+        match msg.as_shared_boxed() {
+            Ok(msg) => {
+                if let Err(err) = self.item_sender.send(Some((mid, msg, req).into())) {
+                    Err(messagebus::error::Error::TryAgain(
+                        err.0.unwrap().unwrap_send().unwrap().1.upcast_box(),
+                    ))
+                } else {
+                    Ok(())
+                }
+            }
+
+            Err(msg) => Err(messagebus::error::Error::TryAgain(msg)),
+        }
+    }
+}
+
+impl ReciveUntypedReceiver for RedisRelay {
+    type Stream = GenericEventStream;
+
+    fn event_stream(&self, bus: Bus) -> Self::Stream {
+        let self_id = self.self_id.clone();
+        let sender = self.item_sender.clone();
+        let mut recv = self.event_receiver.lock().take().unwrap();
+
+        Box::pin(
+            futures::stream::poll_fn(move |cx| recv.poll_recv(cx))
+                .map(move |recv_do| {
+                    let self_id = self_id.clone();
+                    let bus = bus.clone();
+                    let sender = sender.clone();
+
+                    match recv_do {
+                        //     RecvDo::Incoming(incoming) => {
+                        //         futures::stream::unfold((incoming, bus, sender, self_id), |(mut incoming, bus, sender, self_id)| async move {
+                        //             loop {
+                        //                 let (_, recv) = match incoming.next().await? {
+                        //                     Ok(recv) => recv,
+                        //                     Err(err) => {
+                        //                         println!("error: {}", err);
+                        //                         return None;
+                        //                     }
+                        //                 };
+
+                        //                 let buff = recv
+                        //                     .read_to_end(usize::max_value())
+                        //                     .await
+                        //                     .unwrap();
+
+                        //                 // assert_eq!(&buff[0..4], b"MBUS");
+
+                        //                 if buff.is_empty() {
+                        //                     println!("PONG");
+                        //                     continue;
+                        //                 }
+
+                        //                 let mut reader = &buff[4..];
+
+                        //                 let version = reader.get_u16();
+                        //                 let content_type = reader.get_u16();
+                        //                 let body_size = reader.get_u64();
+
+                        //                 println!("inbound packet {}: v: {}; ct: {}; bs: {}", String::from_utf8_lossy(&buff[0..4]), version, content_type, body_size);
+
+                        //                 let event = match content_type {
+                        //                     0 => { // CBOR
+                        //                         let proto: ProtocolPacket = serde_cbor::from_slice(&buff[16..]).unwrap();
+                        //                         match proto.deserialize(&bus).unwrap() {
+                        //                             ProtocolItem::Event(ev) => ev.map_msg(|msg|msg.upcast_box()),
+                        //                             ProtocolItem::Action(action) => {
+                        //                                 match action {
+                        //                                     Action::Close => {
+                        //                                         println!("warning: Close recevied - ignoring!");
+                        //                                         sender.send(Some(ProtocolItem::Event(Event::Exited))).unwrap();
+                        //                                     },
+                        //                                     Action::Flush => {
+                        //                                         bus.flush().await;
+                        //                                         sender.send(Some(ProtocolItem::Event(Event::Flushed))).unwrap();
+                        //                                     },
+                        //                                     Action::Sync => {
+                        //                                         bus.sync().await;
+                        //                                         sender.send(Some(ProtocolItem::Event(Event::Synchronized(Ok(()))))).unwrap();
+                        //                                     },
+                        //                                     Action::Init(..) => (),
+                        //                                     Action::Stats => (),
+                        //                                     _ => (),
+                        //                                 }
+                        //                                 continue;
+                        //                             }
+                        //                             ProtocolItem::Send(mid, msg, req) => {
+                        //                                 if req {
+                        //                                     let res = bus.request_boxed(
+                        //                                         msg.upcast_box(),
+                        //                                     SendOptions::Except(self_id.load(Ordering::SeqCst))
+                        //                                     )
+                        //                                         .await
+                        //                                         .map(|x|x.as_shared_boxed().unwrap())
+                        //                                         .map_err(|x|x.map_msg(|_|()));
+
+                        //                                     sender.send(Some(ProtocolItem::Event(Event::Response(mid, res)))).unwrap();
+                        //                                 } else {
+                        //                                     let _ = bus.send_boxed(msg.upcast_box(), Default::default())
+                        //                                         .await;
+                        //                                 }
+
+                        //                                 continue;
+                        //                             }
+                        //                             _ => unimplemented!()
+                        //                         }
+                        //                     },
+                        //                     _ => unimplemented!()
+                        //                 };
+
+                        //                 return Some((event, (incoming, bus, sender, self_id)));
+                        //             }
+                        //         }).right_stream()
+                        //     }
+                        other => futures::stream::once(async move {
+                            match other {
+                                RecvDo::Ready => Event::Ready,
+                                _ => unreachable!(),
+                            }
+                        }), // .left_stream()
+                    }
+                })
+                .flatten(),
+        )
+    }
+}

crates/remote/src/relays/tcp/mod.rs

@@ -0,0 +1,429 @@
+use std::net::SocketAddr;
+use std::sync::atomic::{AtomicU64, Ordering};
+use std::sync::Arc;
+
+use bytes::{Buf, BufMut};
+use futures::stream::unfold;
+use futures::{pin_mut, Stream, StreamExt};
+use messagebus::error::GenericError;
+use messagebus::{
+    Action, Bus, Event, EventBoxed, Message, ReciveUntypedReceiver, SendOptions,
+    SendUntypedReceiver, TypeTag, TypeTagAccept, TypeTagAcceptItem,
+};
+use parking_lot::Mutex;
+use tokio::io::{AsyncReadExt, AsyncWriteExt};
+use tokio::net::tcp::{OwnedReadHalf, OwnedWriteHalf};
+use tokio::net::{TcpListener, TcpStream};
+use tokio::sync::mpsc::{self, UnboundedReceiver, UnboundedSender};
+
+use crate::proto::{BodyType, ProtocolItem, ProtocolPacket};
+
+use super::{GenericEventStream, MessageList, MessageTable};
+
+pub struct TcpRelay {
+    server_mode: bool,
+    addr: SocketAddr,
+
+    self_id: Arc<AtomicU64>,
+    in_table: MessageTable,
+    // _out_table: MessageTable,
+    item_sender: UnboundedSender<Option<ProtocolItem>>,
+    item_receiver: Mutex<Option<UnboundedReceiver<Option<ProtocolItem>>>>,
+
+    event_sender: UnboundedSender<EventBoxed<GenericError>>,
+    event_receiver: Mutex<Option<UnboundedReceiver<EventBoxed<GenericError>>>>,
+
+    stream_sender: UnboundedSender<OwnedReadHalf>,
+    stream_receiver: Mutex<Option<UnboundedReceiver<OwnedReadHalf>>>,
+}
+
+impl TcpRelay {
+    pub fn new(server_mode: bool, addr: SocketAddr, table: (MessageList, MessageList)) -> Self {
+        let (item_sender, item_receiver) = mpsc::unbounded_channel();
+        let (event_sender, event_receiver) = mpsc::unbounded_channel();
+        let (stream_sender, stream_receiver) = mpsc::unbounded_channel();
+
+        Self {
+            self_id: Arc::new(AtomicU64::new(0)),
+            server_mode,
+            addr,
+            item_sender,
+            in_table: MessageTable::from(table.0),
+            item_receiver: Mutex::new(Some(item_receiver)),
+            event_sender,
+            event_receiver: Mutex::new(Some(event_receiver)),
+            stream_sender,
+            stream_receiver: Mutex::new(Some(stream_receiver)),
+        }
+    }
+
+    fn connections(&self) -> impl Stream<Item = TcpRelayConnection> {
+        unfold(
+            (self.server_mode, self.addr),
+            move |(sm, addr)| async move {
+                let stream = if sm {
+                    let bind_res = TcpListener::bind(addr).await;
+                    let listener = match bind_res {
+                        Err(err) => {
+                            println!("bind error: {}", err);
+                            return None;
+                        }
+
+                        Ok(listener) => listener,
+                    };
+
+                    unfold((listener,), move |(listener,)| async move {
+                        let (stream, _addr) = match listener.accept().await {
+                            Err(err) => {
+                                println!("accept error: {}", err);
+                                return None;
+                            }
+
+                            Ok(listener) => listener,
+                        };
+
+                        Some((TcpRelayConnection::from(stream), (listener,)))
+                    })
+                    .left_stream()
+                } else {
+                    unfold((addr,), move |(addr,)| async move {
+                        let stream = match TcpStream::connect(addr).await {
+                            Err(err) => {
+                                println!("connect error: {}", err);
+                                return None;
+                            }
+
+                            Ok(listener) => listener,
+                        };
+
+                        Some((TcpRelayConnection::from(stream), (addr,)))
+                    })
+                    .right_stream()
+                };
+
+                Some((stream, (sm, addr)))
+            },
+        )
+        .flatten()
+    }
+}
+
+struct TcpRelayConnection {
+    recv: OwnedReadHalf,
+    send: OwnedWriteHalf,
+}
+
+impl From<TcpStream> for TcpRelayConnection {
+    fn from(stream: TcpStream) -> Self {
+        let (recv, send) = stream.into_split();
+        TcpRelayConnection { recv, send }
+    }
+}
+
+impl TypeTagAccept for TcpRelay {
+    fn iter_types(&self) -> Box<dyn Iterator<Item = TypeTagAcceptItem> + '_> {
+        let iter = self.in_table.iter_types();
+        Box::new(iter.map(|(x, y)| (x.clone(), y.cloned())))
+    }
+
+    fn accept_msg(&self, msg: &TypeTag) -> bool {
+        self.in_table.accept_message(msg)
+    }
+
+    fn accept_req(&self, req: &TypeTag, resp: Option<&TypeTag>, err: Option<&TypeTag>) -> bool {
+        self.in_table.accept_request(req, resp, err)
+    }
+}
+
+impl SendUntypedReceiver for TcpRelay {
+    fn send(&self, msg: Action, _bus: &Bus) -> Result<(), messagebus::error::Error<Action>> {
+        match msg {
+            Action::Init(self_id) => {
+                let mut rx = match self.item_receiver.lock().take() {
+                    Some(x) => x,
+                    None => return Ok(()),
+                };
+
+                let stream_sender = self.stream_sender.clone();
+                let event_sender = self.event_sender.clone();
+
+                let incoming = self.connections();
+                self.self_id.store(self_id, Ordering::SeqCst);
+
+                tokio::spawn(async move {
+                    pin_mut!(incoming);
+
+                    let mut body_buff = Vec::new();
+                    let mut header_buff = Vec::new();
+                    let mut item = None;
+
+                    loop {
+                        println!("begin");
+
+                        let mut conn = match incoming.next().await {
+                            Some(x) => x,
+                            None => {
+                                println!("No more connections. Message {:?} has been lost!", item);
+                                break;
+                            }
+                        };
+
+                        stream_sender.send(conn.recv).unwrap();
+                        event_sender.send(Event::Ready).unwrap();
+
+                        loop {
+                            let r = if let Some(r) = item.take() {
+                                r
+                            } else {
+                                match rx.recv().await {
+                                    Some(Some(r)) => r,
+                                    None | Some(None) => {
+                                        println!("closing");
+                                        drop(conn.send);
+                                        break;
+                                    }
+                                }
+                            };
+
+                            body_buff.clear();
+                            let pkt = r.serialize(BodyType::Cbor, &mut body_buff).unwrap();
+
+                            header_buff.resize(16, 0);
+                            serde_cbor::to_writer(&mut header_buff, &pkt).unwrap();
+                            let body_size = header_buff.len() - 16;
+
+                            let mut head = &mut header_buff[0..16];
+
+                            head.put(&b"MBUS"[..]);
+                            head.put_u16(1);
+                            head.put_u16(0);
+                            head.put_u64(body_size as _);
+
+                            if let Err(err) = conn.send.write_all(&header_buff).await {
+                                item = Some(r);
+                                println!(
+                                    "write broken connection err {}. try with next connection",
+                                    err
+                                );
+                                break;
+                            }
+                        }
+
+                        event_sender.send(Event::Pause).unwrap();
+                    }
+
+                    println!("exit main loop");
+                });
+            }
+
+            Action::Close => {
+                self.item_sender.send(None).unwrap();
+                self.event_sender.send(Event::Exited).unwrap();
+            }
+
+            other => self.item_sender.send(Some(other.into())).unwrap(),
+        }
+
+        Ok(())
+    }
+
+    fn send_msg(
+        &self,
+        mid: u64,
+        msg: Box<dyn Message>,
+        req: bool,
+        _bus: &Bus,
+    ) -> Result<(), messagebus::error::Error<Box<dyn Message>>> {
+        match msg.as_shared_boxed() {
+            Ok(msg) => {
+                if let Err(err) = self.item_sender.send(Some((mid, msg, req).into())) {
+                    Err(messagebus::error::Error::TryAgain(
+                        err.0.unwrap().unwrap_send().unwrap().1.upcast_box(),
+                    ))
+                } else {
+                    Ok(())
+                }
+            }
+
+            Err(msg) => Err(messagebus::error::Error::TryAgain(msg)),
+        }
+    }
+}
+
+impl ReciveUntypedReceiver for TcpRelay {
+    type Stream = GenericEventStream;
+
+    fn event_stream(&self, bus: Bus) -> Self::Stream {
+        let self_id = self.self_id.clone();
+
+        let mut recv_stream = self.stream_receiver.lock().take().unwrap();
+        let mut recv_events = self.event_receiver.lock().take().unwrap();
+        let sender = self.item_sender.clone();
+
+        let stream1 = futures::stream::poll_fn(move |cx| recv_stream.poll_recv(cx))
+            .map(move |incoming| {
+                let buff: Vec<u8> = Vec::with_capacity(1024);
+                let bus = bus.clone();
+                let self_id = self_id.clone();
+                let sender = sender.clone();
+
+                futures::stream::unfold(
+                    (incoming, bus, sender, self_id, buff),
+                    |(mut recv, bus, sender, self_id, mut buff)| async move {
+                        loop {
+                            buff.resize(4, 0);
+                            if let Err(err) = recv.read_exact(&mut buff[..]).await {
+                                println!("recv err: {}", err);
+                                break None;
+                            }
+
+                            if &buff == b"PING" {
+                                println!(">> PING");
+                                continue;
+                            }
+
+                            if &buff != b"MBUS" {
+                                println!("Not MBUS packet!");
+                                continue;
+                            }
+
+                            buff.resize(12, 0);
+                            if let Err(err) = recv.read_exact(&mut buff[..]).await {
+                                println!("recv err: {}", err);
+                                continue;
+                            }
+
+                            let mut reader = &buff[..];
+                            let _version = reader.get_u16();
+                            let content_type = reader.get_u16();
+                            let body_size = reader.get_u64();
+
+                            buff.resize(body_size as _, 0);
+                            if let Err(err) = recv.read_exact(&mut buff[..]).await {
+                                println!("recv err: {}", err);
+                                continue;
+                            }
+
+                            // println!("inbound packet MBUS v: {}; ct: {}; bs: {}",
+                            //     version, content_type, body_size);
+
+                            let event = match content_type {
+                                0 => {
+                                    // CBOR
+                                    let proto: ProtocolPacket =
+                                        match serde_cbor::from_slice(&buff[..]) {
+                                            Ok(val) => val,
+                                            Err(err) => {
+                                                println!("pkt parse err: {}", err);
+                                                continue;
+                                            }
+                                        };
+
+                                    let item: ProtocolItem = match proto.deserialize(&bus) {
+                                        Ok(val) => val,
+                                        Err(err) => {
+                                            println!("item parse err: {}", err);
+                                            continue;
+                                        }
+                                    };
+
+                                    match item {
+                                        ProtocolItem::Event(ev) => {
+                                            ev.map_msg(|msg| msg.upcast_box())
+                                        }
+                                        ProtocolItem::Action(action) => {
+                                            match action {
+                                                Action::Close => {
+                                                    println!("warning: Close recevied - ignoring!");
+                                                    sender
+                                                        .send(Some(ProtocolItem::Event(
+                                                            Event::Exited,
+                                                        )))
+                                                        .unwrap();
+                                                }
+                                                Action::Flush => {
+                                                    println!("flush");
+                                                    bus.flush_all().await;
+                                                    sender
+                                                        .send(Some(ProtocolItem::Event(
+                                                            Event::Flushed,
+                                                        )))
+                                                        .unwrap();
+                                                }
+                                                Action::Sync => {
+                                                    println!("sync");
+                                                    bus.sync_all().await;
+                                                    sender
+                                                        .send(Some(ProtocolItem::Event(
+                                                            Event::Synchronized(Ok(())),
+                                                        )))
+                                                        .unwrap();
+                                                }
+                                                Action::Init(..) => (),
+                                                Action::Stats => (),
+                                                _ => (),
+                                            }
+                                            continue;
+                                        }
+                                        ProtocolItem::Send(mid, msg, req) => {
+                                            let self_id = self_id.clone();
+                                            let sender = sender.clone();
+                                            let bus = bus.clone();
+
+                                            let _ = tokio::spawn(async move {
+                                                if req {
+                                                    let res = bus
+                                                        .request_boxed(
+                                                            msg.upcast_box(),
+                                                            SendOptions::Except(
+                                                                self_id.load(Ordering::SeqCst),
+                                                            ),
+                                                        )
+                                                        .await
+                                                        .map(|x| x.as_shared_boxed().unwrap())
+                                                        .map_err(|x| x.map_msg(|_| ()));
+
+                                                    sender
+                                                        .send(Some(ProtocolItem::Event(
+                                                            Event::Response(mid, res),
+                                                        )))
+                                                        .unwrap();
+                                                } else {
+                                                    let tt = msg.type_tag();
+                                                    let _ = bus
+                                                        .send_boxed(
+                                                            msg.upcast_box(),
+                                                            Default::default(),
+                                                        )
+                                                        .await;
+
+                                                    sender
+                                                        .send(Some(ProtocolItem::Event(
+                                                            Event::BatchComplete(tt, 1),
+                                                        )))
+                                                        .unwrap();
+                                                }
+                                            });
+
+                                            continue;
+                                        }
+                                        _ => unimplemented!(),
+                                    }
+                                }
+                                _ => unimplemented!(),
+                            };
+
+                            return Some((event, (recv, bus, sender, self_id, buff)));
+                        }
+                    },
+                )
+            })
+            .flatten();
+
+        let stream2 = futures::stream::poll_fn(move |cx| recv_events.poll_recv(cx));
+        Box::pin(
+            futures::stream::select(stream1, stream2)
+                .take_while(|x| futures::future::ready(!matches!(x, Event::Exited))),
+        )
+    }
+}

examples/benchmark.rs

@@ -0,0 +1,168 @@
+use std::time::Instant;
+
+use async_trait::async_trait;
+use messagebus::{
+    derive::Message, error, receivers::BufferUnorderedConfig, AsyncHandler, Bus, Message,
+};
+use thiserror::Error;
+
+#[derive(Debug, Error, messagebus::derive::Error)]
+enum Error {
+    #[error("Error({0})")]
+    Error(anyhow::Error),
+}
+
+impl<M: Message> From<error::Error<M>> for Error {
+    fn from(err: error::Error<M>) -> Self {
+        Self::Error(err.into())
+    }
+}
+
+struct TmpReceiver;
+struct TmpReceiver2;
+
+#[derive(Debug, Clone, Message)]
+#[message(clone)]
+struct MsgF32(f32);
+
+#[derive(Debug, Clone, Message)]
+#[message(clone)]
+struct MsgU16(u16);
+
+#[derive(Debug, Clone, Message)]
+#[message(clone)]
+struct MsgU32(u32);
+
+#[derive(Debug, Clone, Message)]
+#[message(clone)]
+struct MsgI32(i32);
+
+#[derive(Debug, Clone, Message)]
+#[message(clone)]
+struct MsgI16(i16);
+
+#[async_trait]
+impl AsyncHandler<MsgF32> for TmpReceiver {
+    type Error = Error;
+    type Response = ();
+
+    async fn handle(&self, _msg: MsgF32, bus: &Bus) -> Result<Self::Response, Self::Error> {
+        tokio::time::sleep(std::time::Duration::from_millis(1)).await;
+        bus.send(MsgU16(1)).await?;
+        Ok(())
+    }
+}
+
+#[async_trait]
+impl AsyncHandler<MsgU16> for TmpReceiver {
+    type Error = Error;
+    type Response = ();
+
+    async fn handle(&self, _msg: MsgU16, bus: &Bus) -> Result<Self::Response, Self::Error> {
+        tokio::time::sleep(std::time::Duration::from_millis(1)).await;
+        bus.send(MsgU32(2)).await?;
+        Ok(())
+    }
+}
+
+#[async_trait]
+impl AsyncHandler<MsgU32> for TmpReceiver {
+    type Error = Error;
+    type Response = ();
+
+    async fn handle(&self, _msg: MsgU32, bus: &Bus) -> Result<Self::Response, Self::Error> {
+        tokio::time::sleep(std::time::Duration::from_millis(1)).await;
+        bus.send(MsgI32(3)).await?;
+        Ok(())
+    }
+}
+
+#[async_trait]
+impl AsyncHandler<MsgI32> for TmpReceiver {
+    type Error = Error;
+    type Response = ();
+
+    async fn handle(&self, _msg: MsgI32, bus: &Bus) -> Result<Self::Response, Self::Error> {
+        tokio::time::sleep(std::time::Duration::from_millis(1)).await;
+        bus.send(MsgI16(4)).await?;
+        Ok(())
+    }
+}
+
+#[async_trait]
+impl AsyncHandler<MsgI16> for TmpReceiver {
+    type Error = Error;
+    type Response = ();
+
+    async fn handle(&self, _msg: MsgI16, _bus: &Bus) -> Result<Self::Response, Self::Error> {
+        Ok(())
+    }
+}
+
+#[async_trait]
+impl AsyncHandler<MsgI32> for TmpReceiver2 {
+    type Error = Error;
+    type Response = ();
+
+    async fn handle(&self, _msg: MsgI32, bus: &Bus) -> Result<Self::Response, Self::Error> {
+        tokio::time::sleep(std::time::Duration::from_millis(1)).await;
+        bus.send(MsgI16(5)).await?;
+
+        Ok(())
+    }
+}
+
+async fn iter(bus: &Bus) {
+    for _ in 0..10_000 {
+        bus.send(MsgF32(0.)).await.unwrap();
+    }
+
+    bus.flush_all().await;
+}
+
+#[tokio::main]
+async fn main() {
+    let cfg = BufferUnorderedConfig {
+        buffer_size: 8,
+        max_parallel: 8,
+    };
+
+    let (b, poller) = Bus::build()
+        .register(TmpReceiver)
+        .subscribe_async::<MsgF32>(cfg.buffer_size as _, cfg)
+        .subscribe_async::<MsgU16>(cfg.buffer_size as _, cfg)
+        .subscribe_async::<MsgU32>(cfg.buffer_size as _, cfg)
+        .subscribe_async::<MsgI32>(cfg.buffer_size as _, cfg)
+        .subscribe_async::<MsgI16>(cfg.buffer_size as _, cfg)
+        .done()
+        .register(TmpReceiver2)
+        .subscribe_async::<MsgI32>(cfg.buffer_size as _, cfg)
+        .done()
+        .build();
+
+    iter(&b).await;
+
+    let count = 5;
+
+    let mut time_sum = 0;
+    for _ in 0..count {
+        let inst = Instant::now();
+        iter(&b).await;
+        let diff = inst.elapsed();
+
+        time_sum += diff.as_micros();
+    }
+
+    println!("Avg time: {:.4}", time_sum as f64 / (count as f64 * 1000.0));
+
+    println!("flush");
+    b.flush_all().await;
+
+    println!("close");
+    b.close().await;
+
+    println!("closed");
+
+    poller.await;
+    println!("[done]");
+}

examples/demo.rs

@@ -1,79 +0,0 @@
-use messagebus::{receivers, Bus, Handler, Result as MbusResult};
-
-struct TmpReceiver;
-struct TmpReceiver2;
-
-impl Handler<f32> for TmpReceiver {
-    fn handle(&self, msg: f32, bus: &Bus) -> MbusResult {
-        bus.try_send(1u16).unwrap();
-
-        println!("---> f32 {}", msg);
-        Ok(())
-    }
-}
-
-impl Handler<u16> for TmpReceiver {
-    fn handle(&self, msg: u16, bus: &Bus) -> MbusResult {
-        bus.try_send(1u32).unwrap();
-        println!("---> u16 {}", msg);
-        Ok(())
-    }
-}
-
-impl Handler<u32> for TmpReceiver {
-    fn handle(&self, msg: u32, bus: &Bus) -> MbusResult {
-        bus.try_send(2i32).unwrap();
-        println!("---> u32 {}", msg);
-        Ok(())
-    }
-}
-
-impl Handler<i32> for TmpReceiver {
-    fn handle(&self, msg: i32, bus: &Bus) -> MbusResult {
-        bus.try_send(3i16).unwrap();
-        println!("---> i32 {}", msg);
-        Ok(())
-    }
-}
-
-impl Handler<i16> for TmpReceiver {
-    fn handle(&self, msg: i16, _bus: &Bus) -> MbusResult {
-        println!("---> i16 {}", msg);
-        Ok(())
-    }
-}
-
-impl Handler<i32> for TmpReceiver2 {
-    fn handle(&self, msg: i32, bus: &Bus) -> MbusResult {
-        bus.try_send(3i16).unwrap();
-        println!("---> 2 i32 {}", msg);
-        Ok(())
-    }
-}
-
-impl Handler<i16> for TmpReceiver2 {
-    fn handle(&self, msg: i16, _bus: &Bus) -> MbusResult {
-        println!("---> 2 i16 {}", msg);
-        Ok(())
-    }
-}
-
-#[tokio::main]
-async fn main() {
-    let (b, poller) = Bus::build()
-        .register(TmpReceiver)
-        .subscribe::<f32, receivers::BufferUnorderedSync<_>>(Default::default())
-        .subscribe::<u16, receivers::BufferUnorderedSync<_>>(Default::default())
-        .subscribe::<u32, receivers::BufferUnorderedSync<_>>(Default::default())
-        .subscribe::<i32, receivers::BufferUnorderedSync<_>>(Default::default())
-        .subscribe::<i16, receivers::BufferUnorderedSync<_>>(Default::default())
-        .done()
-        .register(TmpReceiver2)
-        .subscribe::<i32, receivers::BufferUnorderedSync<_>>(Default::default())
-        .subscribe::<i16, receivers::BufferUnorderedSync<_>>(Default::default())
-        .done()
-        .build();
-
-    b.send(32f32).await.unwrap();
-    poller.await
-}

examples/demo_async.rs

@@ -1,72 +1,166 @@
 use async_trait::async_trait;
-use messagebus::{receivers, AsyncHandler, Bus, Handler, Result as MbusResult};
+use messagebus::{derive::Message, error, AsyncHandler, Bus, Handler, Message, TypeTagged};
+use thiserror::Error;
+
+#[derive(Debug, Error, messagebus::derive::Error)]
+enum Error {
+    #[error("Error({0})")]
+    Error(anyhow::Error),
+}
+
+impl<M: Message> From<error::Error<M>> for Error {
+    fn from(err: error::Error<M>) -> Self {
+        Self::Error(err.into())
+    }
+}
 
 struct TmpReceiver;
 struct TmpReceiver2;
 
-#[async_trait]
-impl AsyncHandler<f32> for TmpReceiver {
-    async fn handle(&self, msg: f32, bus: &Bus) -> MbusResult {
-        bus.send(1u16).await?;
+#[derive(Debug, Clone, Message)]
+#[message(clone)]
+struct MsgF32(f32);
 
-        println!("---> f32 {}", msg);
+#[derive(Debug, Clone, Message)]
+#[message(clone)]
+struct MsgU16(u16);
+
+#[derive(Debug, Clone, Message)]
+#[message(clone)]
+struct MsgU32(u32);
+
+#[derive(Debug, Clone, Message)]
+#[message(clone)]
+struct MsgI32(i32);
+
+#[derive(Debug, Clone, Message)]
+#[message(clone)]
+struct MsgI16(i16);
+
+#[async_trait]
+impl AsyncHandler<MsgF32> for TmpReceiver {
+    type Error = Error;
+    type Response = ();
+
+    async fn handle(&self, msg: MsgF32, bus: &Bus) -> Result<Self::Response, Self::Error> {
+        bus.send(MsgU16(1)).await?;
+
+        println!("TmpReceiver ---> {:?} {}", msg, msg.type_tag());
+
+        Ok(())
+    }
+
+    async fn sync(&self, _bus: &Bus) -> Result<(), Self::Error> {
+        println!("TmpReceiver f32: sync");
 
         Ok(())
     }
 }
 
 #[async_trait]
-impl AsyncHandler<u16> for TmpReceiver {
-    async fn handle(&self, msg: u16, bus: &Bus) -> MbusResult {
-        bus.send(2u32).await?;
-        println!("---> u16 {}", msg);
+impl AsyncHandler<MsgU16> for TmpReceiver {
+    type Error = Error;
+    type Response = ();
+
+    async fn handle(&self, msg: MsgU16, bus: &Bus) -> Result<Self::Response, Self::Error> {
+        bus.send(MsgU32(2)).await?;
+        println!("TmpReceiver ---> {:?}", msg);
+
+        Ok(())
+    }
+
+    async fn sync(&self, _bus: &Bus) -> Result<(), Self::Error> {
+        println!("TmpReceiver u16: sync");
 
         Ok(())
     }
 }
 
 #[async_trait]
-impl AsyncHandler<u32> for TmpReceiver {
-    async fn handle(&self, msg: u32, bus: &Bus) -> MbusResult {
-        bus.send(3i32).await?;
-        println!("---> u32 {}", msg);
+impl AsyncHandler<MsgU32> for TmpReceiver {
+    type Error = Error;
+    type Response = ();
+
+    async fn handle(&self, msg: MsgU32, bus: &Bus) -> Result<Self::Response, Self::Error> {
+        bus.send(MsgI32(3)).await?;
+        println!("TmpReceiver ---> {:?}", msg);
+
+        Ok(())
+    }
+    async fn sync(&self, _bus: &Bus) -> Result<(), Self::Error> {
+        println!("TmpReceiver u32: sync");
 
         Ok(())
     }
 }
 
 #[async_trait]
-impl AsyncHandler<i32> for TmpReceiver {
-    async fn handle(&self, msg: i32, bus: &Bus) -> MbusResult {
-        bus.send(4i16).await?;
-        println!("---> i32 {}", msg);
+impl AsyncHandler<MsgI32> for TmpReceiver {
+    type Error = Error;
+    type Response = ();
+
+    async fn handle(&self, msg: MsgI32, bus: &Bus) -> Result<Self::Response, Self::Error> {
+        bus.send(MsgI16(4)).await?;
+        println!("TmpReceiver ---> {:?}", msg);
+
+        Ok(())
+    }
+
+    async fn sync(&self, _bus: &Bus) -> Result<(), Self::Error> {
+        println!("TmpReceiver i32: sync");
 
         Ok(())
     }
 }
 
 #[async_trait]
-impl AsyncHandler<i16> for TmpReceiver {
-    async fn handle(&self, msg: i16, _bus: &Bus) -> MbusResult {
-        println!("---> i16 {}", msg);
+impl AsyncHandler<MsgI16> for TmpReceiver {
+    type Error = Error;
+    type Response = ();
+
+    async fn handle(&self, msg: MsgI16, _bus: &Bus) -> Result<Self::Response, Self::Error> {
+        println!("TmpReceiver ---> {:?}", msg);
+
+        Ok(())
+    }
+    async fn sync(&self, _bus: &Bus) -> Result<(), Self::Error> {
+        println!("TmpReceiver i16: sync");
 
         Ok(())
     }
 }
 
 #[async_trait]
-impl AsyncHandler<i32> for TmpReceiver2 {
-    async fn handle(&self, msg: i32, bus: &Bus) -> MbusResult {
-        bus.send(5i16).await?;
-        println!("---> 2 i32 {}", msg);
+impl AsyncHandler<MsgI32> for TmpReceiver2 {
+    type Error = Error;
+    type Response = ();
+
+    async fn handle(&self, msg: MsgI32, bus: &Bus) -> Result<Self::Response, Self::Error> {
+        println!("TmpReceiver2: ---> {:?}", msg);
+
+        bus.send(MsgI16(5)).await?;
+
+        Ok(())
+    }
+    async fn sync(&self, _bus: &Bus) -> Result<(), Self::Error> {
+        println!("TmpReceiver2: i32: sync");
 
         Ok(())
     }
 }
 
-impl Handler<i16> for TmpReceiver2 {
-    fn handle(&self, msg: i16, _bus: &Bus) -> MbusResult {
-        println!("---> 2 i16 {}", msg);
+impl Handler<MsgI16> for TmpReceiver2 {
+    type Error = Error;
+    type Response = ();
+
+    fn handle(&self, msg: MsgI16, _bus: &Bus) -> Result<Self::Response, Self::Error> {
+        println!("TmpReceiver2: ---> {:?}", msg);
+
+        Ok(())
+    }
+
+    fn sync(&self, _bus: &Bus) -> Result<(), Self::Error> {
+        println!("TmpReceiver2: i16: sync");
 
         Ok(())
     }
@@ -74,20 +168,32 @@ impl Handler<i16> for TmpReceiver2 {
 
 #[tokio::main]
 async fn main() {
+    env_logger::init();
+
     let (b, poller) = Bus::build()
         .register(TmpReceiver)
-        .subscribe::<f32, receivers::BufferUnorderedAsync<_>>(Default::default())
-        .subscribe::<u16, receivers::BufferUnorderedAsync<_>>(Default::default())
-        .subscribe::<u32, receivers::BufferUnorderedAsync<_>>(Default::default())
-        .subscribe::<i32, receivers::BufferUnorderedAsync<_>>(Default::default())
-        .subscribe::<i16, receivers::BufferUnorderedAsync<_>>(Default::default())
+        .subscribe_async::<MsgF32>(8, Default::default())
+        .subscribe_async::<MsgU16>(8, Default::default())
+        .subscribe_async::<MsgU32>(8, Default::default())
+        .subscribe_async::<MsgI32>(8, Default::default())
+        .subscribe_async::<MsgI16>(8, Default::default())
         .done()
         .register(TmpReceiver2)
-        .subscribe::<i32, receivers::BufferUnorderedAsync<_>>(Default::default())
-        .subscribe::<i16, receivers::BufferUnorderedSync<_>>(Default::default())
+        .subscribe_async::<MsgI32>(8, Default::default())
+        .subscribe_sync::<MsgI16>(8, Default::default())
         .done()
         .build();
 
-    b.send(0f32).await.unwrap();
-    poller.await
+    b.send(MsgF32(0.)).await.unwrap();
+
+    println!("flush");
+    b.flush_all().await;
+
+    println!("close");
+    b.close().await;
+
+    println!("closed");
+
+    poller.await;
+    println!("[done]");
 }

examples/demo_backpressure.rs

@@ -1,63 +0,0 @@
-use messagebus::{receivers, Bus, Handler, Result as MbusResult};
-
-struct TmpReceiver;
-
-impl Handler<f32> for TmpReceiver {
-    fn handle(&self, msg: f32, _bus: &Bus) -> MbusResult {
-        println!("---> f32 {}", msg);
-
-        std::thread::sleep(std::time::Duration::from_secs(1));
-
-        println!("done");
-        Ok(())
-    }
-}
-
-#[tokio::main]
-async fn main() {
-    let (b, poller) = Bus::build()
-        .register(TmpReceiver)
-        .subscribe::<f32, receivers::BufferUnorderedSync<_>>(receivers::BufferUnorderedConfig {
-            buffer_size: 1,
-            max_parallel: 1,
-        })
-        .done()
-        .build();
-
-    println!("sending 1");
-    b.send(32f32).await.unwrap();
-
-    println!("sending 2");
-    b.send(32f32).await.unwrap();
-
-    println!("sending 3");
-    b.send(32f32).await.unwrap();
-
-    println!("sending 4");
-    b.send(32f32).await.unwrap();
-
-    println!("sending 5");
-    b.send(32f32).await.unwrap();
-
-    println!("sending 6");
-    b.send(32f32).await.unwrap();
-
-    println!("sending 7");
-    b.send(32f32).await.unwrap();
-
-    println!("sending 8");
-    b.send(32f32).await.unwrap();
-
-    println!("sending 9");
-    b.send(32f32).await.unwrap();
-
-    println!("sending 10");
-    b.send(32f32).await.unwrap();
-
-    println!("sending 11");
-    b.send(32f32).await.unwrap();
-
-    println!("finish");
-
-    poller.await;
-}

examples/demo_boxed.rs

@@ -0,0 +1,211 @@
+use async_trait::async_trait;
+use messagebus::{
+    derive::{Error as MbError, Message},
+    error, AsyncHandler, Bus, Handler, Message,
+};
+use thiserror::Error;
+
+#[derive(Debug, Error, MbError)]
+enum Error {
+    #[error("Error({0})")]
+    Error(anyhow::Error),
+}
+
+impl<M: Message> From<error::Error<M>> for Error {
+    fn from(err: error::Error<M>) -> Self {
+        Self::Error(err.into())
+    }
+}
+
+#[derive(Debug, Clone, Message)]
+#[message(clone)]
+struct MsgF32(f32);
+
+#[derive(Debug, Clone, Message)]
+#[message(clone)]
+struct MsgU16(u16);
+
+#[derive(Debug, Clone, Message)]
+#[message(clone)]
+struct MsgU32(u32);
+
+#[derive(Debug, Clone, Message)]
+#[message(clone)]
+struct MsgI32(i32);
+
+#[derive(Debug, Clone, Message)]
+#[message(clone)]
+struct MsgI16(i16);
+
+struct TmpReceiver;
+struct TmpReceiver2;
+
+#[async_trait]
+impl AsyncHandler<MsgF32> for TmpReceiver {
+    type Error = Error;
+    type Response = ();
+
+    async fn handle(&self, msg: MsgF32, bus: &Bus) -> Result<Self::Response, Self::Error> {
+        bus.send(MsgU16(1u16)).await?;
+
+        println!("TmpReceiver ---> {:?}", msg);
+
+        Ok(())
+    }
+
+    async fn sync(&self, _bus: &Bus) -> Result<(), Self::Error> {
+        println!("TmpReceiver f32: sync");
+
+        Ok(())
+    }
+}
+
+#[async_trait]
+impl AsyncHandler<MsgU16> for TmpReceiver {
+    type Error = Error;
+    type Response = ();
+
+    async fn handle(&self, msg: MsgU16, bus: &Bus) -> Result<Self::Response, Self::Error> {
+        bus.send(MsgU32(2u32)).await?;
+        println!("TmpReceiver ---> {:?}", msg);
+
+        Ok(())
+    }
+
+    async fn sync(&self, _bus: &Bus) -> Result<(), Self::Error> {
+        println!("TmpReceiver u16: sync");
+
+        Ok(())
+    }
+}
+
+#[async_trait]
+impl AsyncHandler<MsgU32> for TmpReceiver {
+    type Error = Error;
+    type Response = ();
+
+    async fn handle(&self, msg: MsgU32, bus: &Bus) -> Result<Self::Response, Self::Error> {
+        bus.send(MsgI32(3i32)).await?;
+        println!("TmpReceiver ---> {:?}", msg);
+
+        Ok(())
+    }
+    async fn sync(&self, _bus: &Bus) -> Result<(), Self::Error> {
+        println!("TmpReceiver u32: sync");
+
+        Ok(())
+    }
+}
+
+#[async_trait]
+impl AsyncHandler<MsgI32> for TmpReceiver {
+    type Error = Error;
+    type Response = ();
+
+    async fn handle(&self, msg: MsgI32, bus: &Bus) -> Result<Self::Response, Self::Error> {
+        bus.send(MsgI16(4i16)).await?;
+        println!("TmpReceiver ---> {:?}", msg);
+
+        Ok(())
+    }
+
+    async fn sync(&self, _bus: &Bus) -> Result<(), Self::Error> {
+        println!("TmpReceiver i32: sync");
+
+        Ok(())
+    }
+}
+
+#[async_trait]
+impl AsyncHandler<MsgI16> for TmpReceiver {
+    type Error = Error;
+    type Response = ();
+
+    async fn handle(&self, msg: MsgI16, _bus: &Bus) -> Result<Self::Response, Self::Error> {
+        println!("TmpReceiver ---> {:?}", msg);
+
+        Ok(())
+    }
+    async fn sync(&self, _bus: &Bus) -> Result<(), Self::Error> {
+        println!("TmpReceiver i16: sync");
+
+        Ok(())
+    }
+}
+
+#[async_trait]
+impl AsyncHandler<MsgI32> for TmpReceiver2 {
+    type Error = Error;
+    type Response = ();
+
+    async fn handle(&self, msg: MsgI32, bus: &Bus) -> Result<Self::Response, Self::Error> {
+        println!("TmpReceiver2: ---> {:?}", msg);
+
+        bus.send(MsgI16(5i16)).await?;
+
+        Ok(())
+    }
+    async fn sync(&self, _bus: &Bus) -> Result<(), Self::Error> {
+        println!("TmpReceiver2: i32: sync");
+
+        Ok(())
+    }
+}
+
+impl Handler<MsgI16> for TmpReceiver2 {
+    type Error = Error;
+    type Response = ();
+
+    fn handle(&self, msg: MsgI16, _bus: &Bus) -> Result<Self::Response, Self::Error> {
+        println!("TmpReceiver2: ---> {:?}", msg);
+
+        Ok(())
+    }
+
+    fn sync(&self, _bus: &Bus) -> Result<(), Self::Error> {
+        println!("TmpReceiver2: i16: sync");
+
+        Ok(())
+    }
+}
+
+#[tokio::main]
+async fn main() {
+    env_logger::init();
+
+    let (b, poller) = Bus::build()
+        .register(TmpReceiver)
+        .subscribe_async::<MsgF32>(8, Default::default())
+        .subscribe_async::<MsgU16>(8, Default::default())
+        .subscribe_async::<MsgU32>(8, Default::default())
+        .subscribe_async::<MsgI32>(8, Default::default())
+        .subscribe_async::<MsgI16>(8, Default::default())
+        .done()
+        .register(TmpReceiver2)
+        .subscribe_async::<MsgI32>(8, Default::default())
+        .subscribe_sync::<MsgI16>(8, Default::default())
+        .done()
+        .build();
+
+    b.send(MsgF32(0f32)).await.unwrap();
+    println!("flush");
+
+    b.flush_all().await;
+
+    println!("sending boxed variant");
+
+    b.send_boxed(Box::new(MsgF32(0f32)), Default::default())
+        .await
+        .unwrap();
+
+    println!("flush");
+    b.flush_all().await;
+
+    println!("close");
+    b.close().await;
+
+    println!("closed");
+
+    poller.await;
+    println!("[done]");
+}

examples/demo_relay.rs

@@ -0,0 +1,57 @@
+use messagebus::{
+    derive::{Error as MbError, Message},
+    error, Bus, Handler, Message, MessageBounds, Module,
+};
+use thiserror::Error;
+
+#[derive(Debug, Error, MbError)]
+enum Error {
+    #[error("Error({0})")]
+    Error(anyhow::Error),
+}
+
+impl<M: Message> From<error::Error<M>> for Error {
+    fn from(err: error::Error<M>) -> Self {
+        Self::Error(err.into())
+    }
+}
+
+#[derive(Debug, Clone, Message)]
+pub struct Msg<F: MessageBounds + Clone>(pub F);
+
+struct TmpReceiver;
+
+impl Handler<Msg<u32>> for TmpReceiver {
+    type Error = Error;
+    type Response = ();
+
+    fn handle(&self, msg: Msg<u32>, _bus: &Bus) -> Result<Self::Response, Self::Error> {
+        println!("---> u32 {:?}", msg);
+        Ok(())
+    }
+}
+
+fn module() -> Module {
+    Module::new()
+        .register(TmpReceiver)
+        .subscribe_sync::<Msg<u32>>(8, Default::default())
+        .done()
+}
+
+#[tokio::main]
+async fn main() {
+    let (b, poller) = Bus::build().add_module(module()).build();
+
+    // b.
+
+    println!("flush");
+    b.flush_all().await;
+
+    println!("close");
+    b.close().await;
+
+    println!("closed");
+
+    poller.await;
+    println!("[done]");
+}

examples/demo_slow.rs

@@ -1,10 +1,38 @@
-use messagebus::{receivers, Bus, Handler, Result as MbusResult};
+use messagebus::{
+    derive::{Error as MbError, Message},
+    error, Bus, Handler, Message, Module,
+};
+use thiserror::Error;
+
+#[derive(Debug, Error, MbError)]
+enum Error {
+    #[error("Error({0})")]
+    Error(anyhow::Error),
+}
+
+impl<M: Message> From<error::Error<M>> for Error {
+    fn from(err: error::Error<M>) -> Self {
+        Self::Error(err.into())
+    }
+}
+
+#[derive(Debug, Clone, Message)]
+struct MsgF32(pub f32);
+
+#[derive(Debug, Clone, Message)]
+struct MsgU32(pub u32);
+
+#[derive(Debug, Clone, Message)]
+struct MsgU16(pub u16);
 
 struct TmpReceiver;
 
-impl Handler<f32> for TmpReceiver {
-    fn handle(&self, msg: f32, _bus: &Bus) -> MbusResult {
-        println!("---> f32 {}", msg);
+impl Handler<MsgF32> for TmpReceiver {
+    type Error = Error;
+    type Response = ();
+
+    fn handle(&self, msg: MsgF32, _bus: &Bus) -> Result<Self::Response, Self::Error> {
+        println!("---> f32 {:?}", msg);
 
         std::thread::sleep(std::time::Duration::from_secs(5));
 
@@ -14,33 +42,51 @@ impl Handler<f32> for TmpReceiver {
     }
 }
 
-impl Handler<u16> for TmpReceiver {
-    fn handle(&self, msg: u16, _bus: &Bus) -> MbusResult {
-        println!("---> u16 {}", msg);
+impl Handler<MsgU16> for TmpReceiver {
+    type Error = Error;
+    type Response = ();
+
+    fn handle(&self, msg: MsgU16, _bus: &Bus) -> Result<Self::Response, Self::Error> {
+        println!("---> u16 {:?}", msg);
         Ok(())
     }
 }
 
-impl Handler<u32> for TmpReceiver {
-    fn handle(&self, msg: u32, _bus: &Bus) -> MbusResult {
-        println!("---> u32 {}", msg);
+impl Handler<MsgU32> for TmpReceiver {
+    type Error = Error;
+    type Response = ();
+
+    fn handle(&self, msg: MsgU32, _bus: &Bus) -> Result<Self::Response, Self::Error> {
+        println!("---> u32 {:?}", msg);
         Ok(())
     }
 }
 
+fn module() -> Module {
+    Module::new()
+        .register(TmpReceiver)
+        .subscribe_sync::<MsgF32>(8, Default::default())
+        .subscribe_sync::<MsgU16>(8, Default::default())
+        .subscribe_sync::<MsgU32>(8, Default::default())
+        .done()
+}
+
 #[tokio::main]
 async fn main() {
-    let (b, poller) = Bus::build()
-        .register(TmpReceiver)
-        .subscribe::<f32, receivers::BufferUnorderedSync<_>>(Default::default())
-        .subscribe::<u16, receivers::BufferUnorderedSync<_>>(Default::default())
-        .subscribe::<u32, receivers::BufferUnorderedSync<_>>(Default::default())
-        .done()
-        .build();
+    let (b, poller) = Bus::build().add_module(module()).build();
 
-    b.send(32f32).await.unwrap();
-    b.send(11u16).await.unwrap();
-    b.send(32u32).await.unwrap();
+    b.send(MsgF32(32f32)).await.unwrap();
+    b.send(MsgU16(11u16)).await.unwrap();
+    b.send(MsgU32(32u32)).await.unwrap();
 
-    poller.await
+    println!("flush");
+    b.flush_all().await;
+
+    println!("close");
+    b.close().await;
+
+    println!("closed");
+
+    poller.await;
+    println!("[done]");
 }

examples/demo_sync_batch.rs

@@ -0,0 +1,93 @@
+use std::sync::Arc;
+
+use async_trait::async_trait;
+use messagebus::{
+    derive::{Error as MbError, Message},
+    error, AsyncBatchSynchronizedHandler, BatchSynchronizedHandler, Bus, Message,
+};
+use thiserror::Error;
+
+#[derive(Debug, Error, Clone, MbError)]
+enum Error {
+    #[error("Error({0})")]
+    Error(Arc<anyhow::Error>),
+}
+
+impl<M: Message> From<error::Error<M>> for Error {
+    fn from(err: error::Error<M>) -> Self {
+        Self::Error(Arc::new(err.into()))
+    }
+}
+
+#[derive(Debug, Clone, Message)]
+#[message(clone)]
+struct MsgI32(i32);
+
+#[derive(Debug, Clone, Message)]
+#[message(clone)]
+struct MsgI16(i16);
+
+struct TmpReceiver;
+
+#[async_trait]
+impl AsyncBatchSynchronizedHandler<MsgI32> for TmpReceiver {
+    type Error = Error;
+    type Response = ();
+    type InBatch = Vec<MsgI32>;
+    type OutBatch = Vec<()>;
+
+    async fn handle(
+        &mut self,
+        msg: Vec<MsgI32>,
+        _bus: &Bus,
+    ) -> Result<Vec<Self::Response>, Self::Error> {
+        println!("---> [i32; {}] {:?}", msg.len(), msg);
+
+        Ok(vec![])
+    }
+}
+
+impl BatchSynchronizedHandler<MsgI16> for TmpReceiver {
+    type Error = Error;
+    type Response = ();
+    type InBatch = Vec<MsgI16>;
+    type OutBatch = Vec<()>;
+
+    fn handle(&mut self, msg: Vec<MsgI16>, _bus: &Bus) -> Result<Vec<Self::Response>, Self::Error> {
+        println!("---> [i16; {}] {:?}", msg.len(), msg);
+        Ok(vec![])
+    }
+}
+
+#[tokio::main]
+async fn main() {
+    let (b, poller) = Bus::build()
+        .register_unsync(TmpReceiver)
+        .subscribe_batch_async::<MsgI32>(16, Default::default())
+        .subscribe_batch_sync::<MsgI16>(16, Default::default())
+        .done()
+        .build();
+
+    for i in 1..100i32 {
+        b.send(MsgI32(i)).await.unwrap();
+    }
+
+    b.send(MsgI16(1i16)).await.unwrap();
+    b.send(MsgI16(2i16)).await.unwrap();
+    b.send(MsgI16(3i16)).await.unwrap();
+    b.send(MsgI16(4i16)).await.unwrap();
+    b.send(MsgI16(5i16)).await.unwrap();
+    b.send(MsgI16(6i16)).await.unwrap();
+    b.send(MsgI16(7i16)).await.unwrap();
+
+    println!("flush");
+    b.flush_all().await;
+
+    println!("close");
+    b.close().await;
+
+    println!("closed");
+
+    poller.await;
+    println!("[done]");
+}

examples/non_sync.rs

@@ -1,24 +1,51 @@
-use messagebus::{receivers, Bus, Result as MbusResult, SynchronizedHandler};
-use receivers::SynchronizedConfig;
+use async_trait::async_trait;
+use messagebus::{
+    derive::{Error as MbError, Message},
+    error, AsyncSynchronizedHandler, Bus, Message, SynchronizedHandler,
+};
+use thiserror::Error;
+
+#[derive(Debug, Error, MbError)]
+enum Error {
+    #[error("Error({0})")]
+    Error(anyhow::Error),
+}
+
+impl<M: Message> From<error::Error<M>> for Error {
+    fn from(err: error::Error<M>) -> Self {
+        Self::Error(err.into())
+    }
+}
+
+#[derive(Debug, Clone, Message)]
+struct MsgF32(pub f32);
+
+#[derive(Debug, Clone, Message)]
+struct MsgI16(pub i16);
 
 struct TmpReceiver;
 
-impl SynchronizedHandler<f32> for TmpReceiver {
-    fn handle(&mut self, msg: f32, _bus: &Bus) -> MbusResult {
-        println!("---> f32 {}", msg);
+impl SynchronizedHandler<MsgF32> for TmpReceiver {
+    type Error = Error;
+    type Response = ();
 
-        std::thread::sleep(std::time::Duration::from_secs(1));
+    fn handle(&mut self, msg: MsgF32, _bus: &Bus) -> Result<Self::Response, Self::Error> {
+        // std::thread::sleep(std::time::Duration::from_millis(100));
+        println!("---> f32 {:?}", msg);
 
         println!("done");
         Ok(())
     }
 }
 
-impl SynchronizedHandler<i16> for TmpReceiver {
-    fn handle(&mut self, msg: i16, _bus: &Bus) -> MbusResult {
-        println!("---> i16 {}", msg);
+#[async_trait]
+impl AsyncSynchronizedHandler<MsgI16> for TmpReceiver {
+    type Error = Error;
+    type Response = ();
 
-        std::thread::sleep(std::time::Duration::from_secs(1));
+    async fn handle(&mut self, msg: MsgI16, _bus: &Bus) -> Result<Self::Response, Self::Error> {
+        std::thread::sleep(std::time::Duration::from_millis(100));
+        println!("---> i16 {:?}", msg);
 
         println!("done");
         Ok(())
@@ -29,29 +56,42 @@ impl SynchronizedHandler<i16> for TmpReceiver {
 async fn main() {
     let (b, poller) = Bus::build()
         .register_unsync(TmpReceiver)
-        .subscribe::<f32, receivers::SynchronizedSync<_>>(SynchronizedConfig { buffer_size: 1 })
-        .subscribe::<i16, receivers::SynchronizedSync<_>>(Default::default())
+        .subscribe_sync::<MsgF32>(8, Default::default())
+        .subscribe_async::<MsgI16>(8, Default::default())
         .done()
         .build();
 
-    b.send(12.0f32).await.unwrap();
-    b.send(1i16).await.unwrap();
-    b.send(12.0f32).await.unwrap();
-    b.send(1i16).await.unwrap();
-    b.send(12.0f32).await.unwrap();
-    b.send(1i16).await.unwrap();
-    b.send(12.0f32).await.unwrap();
-    b.send(1i16).await.unwrap();
-    b.send(12.0f32).await.unwrap();
-    b.send(1i16).await.unwrap();
-    b.send(12.0f32).await.unwrap();
-    b.send(1i16).await.unwrap();
-    b.send(12.0f32).await.unwrap();
-    b.send(1i16).await.unwrap();
-    b.send(12.0f32).await.unwrap();
-    b.send(1i16).await.unwrap();
+    b.send(MsgF32(12.0f32)).await.unwrap();
+    b.send(MsgI16(1i16)).await.unwrap();
+    b.send(MsgF32(12.0f32)).await.unwrap();
+    b.send(MsgI16(1i16)).await.unwrap();
+    b.send(MsgF32(12.0f32)).await.unwrap();
+    b.send(MsgI16(1i16)).await.unwrap();
+    b.send(MsgF32(12.0f32)).await.unwrap();
+    b.send(MsgI16(1i16)).await.unwrap();
+    b.send(MsgF32(12.0f32)).await.unwrap();
+    b.send(MsgI16(1i16)).await.unwrap();
+    b.send(MsgF32(12.0f32)).await.unwrap();
+    b.send(MsgI16(1i16)).await.unwrap();
+    b.send(MsgF32(12.0f32)).await.unwrap();
+    b.send(MsgI16(1i16)).await.unwrap();
+    b.send(MsgF32(12.0f32)).await.unwrap();
+    b.send(MsgI16(1i16)).await.unwrap();
 
-    println!("finish");
+    b.send(MsgF32(12.0f32)).await.unwrap();
+    b.send(MsgI16(1i16)).await.unwrap();
+
+    println!("flush");
+
+    b.flush_all().await;
+
+    println!("closing");
+
+    b.close().await;
+
+    println!("closed");
 
     poller.await;
+
+    println!("[done]");
 }

src/builder.rs

@@ -1,160 +1,388 @@
-use std::{any::TypeId, collections::HashMap, marker::PhantomData, pin::Pin, sync::Arc};
+use core::{marker::PhantomData, pin::Pin};
+
+use std::{
+    collections::HashSet,
+    sync::{
+        atomic::{AtomicU64, Ordering},
+        Arc,
+    },
+};
 
 use futures::{Future, FutureExt};
-use receiver::ReceiverTrait;
 use tokio::sync::Mutex;
 
 use crate::{
-    receiver::{self, Receiver},
-    Bus, BusInner, Message, Untyped,
+    error::StdSyncSendError,
+    receiver::{
+        BusPollerCallback, Receiver, ReciveTypedReceiver, SendTypedReceiver, SendUntypedReceiver,
+        UntypedPollerCallback,
+    },
+    receivers, AsyncBatchHandler, AsyncBatchSynchronizedHandler, AsyncHandler,
+    AsyncSynchronizedHandler, BatchHandler, BatchSynchronizedHandler, Bus, BusInner, Handler,
+    Message, Relay, SynchronizedHandler, Untyped,
 };
 
-pub trait ReceiverSubscriber<T: 'static> {
-    fn subscribe(
-        self,
-    ) -> (
-        Arc<dyn ReceiverTrait>,
-        Box<
-            dyn FnOnce(Untyped) -> Box<dyn FnOnce(Bus) -> Pin<Box<dyn Future<Output = ()> + Send>>>,
-        >,
-    );
-}
+static RECEVIER_ID_SEQ: AtomicU64 = AtomicU64::new(1);
 
-pub trait ReceiverSubscriberBuilder<M, T: 'static> {
-    type Entry: ReceiverSubscriber<T>;
+pub trait ReceiverSubscriberBuilder<T, M, R, E>:
+    SendUntypedReceiver + SendTypedReceiver<M> + ReciveTypedReceiver<R, E>
+where
+    T: 'static,
+    M: Message,
+    R: Message,
+    E: StdSyncSendError,
+{
     type Config: Default;
 
-    fn build(cfg: Self::Config) -> Self::Entry;
+    fn build(cfg: Self::Config) -> (Self, UntypedPollerCallback)
+    where
+        Self: Sized;
 }
 
 pub struct SyncEntry;
 pub struct UnsyncEntry;
 
 #[must_use]
-pub struct RegisterEntry<K, T> {
+pub struct RegisterEntry<K, T, F, P, B> {
     item: Untyped,
-    builder: BusBuilder,
-    receivers: HashMap<
-        TypeId,
-        Vec<(
-            Receiver,
-            Box<
-                dyn FnOnce(
-                    Untyped,
-                )
-                    -> Box<dyn FnOnce(Bus) -> Pin<Box<dyn Future<Output = ()> + Send>>>,
-            >,
-        )>,
-    >,
+    payload: B,
+    builder: F,
+    poller: P,
+    receivers: HashSet<Receiver>,
+    pollers: Vec<BusPollerCallback>,
     _m: PhantomData<(K, T)>,
 }
 
-impl<K, T: 'static> RegisterEntry<K, T> {
-    pub fn done(self) -> BusBuilder {
-        let mut builder = self.builder;
-
-        for (tid, v) in self.receivers {
-            for (r, poller) in v {
-                let poller = poller(self.item.clone());
-
-                builder.add_recevier((tid, r), poller);
-            }
+impl<K, T: 'static, F, P, B> RegisterEntry<K, T, F, P, B>
+where
+    F: FnMut(&mut B, Receiver),
+    P: FnMut(&mut B, BusPollerCallback),
+{
+    pub fn done(mut self) -> B {
+        for r in self.receivers {
+            (self.builder)(&mut self.payload, r);
         }
 
-        builder
+        for p in self.pollers {
+            (self.poller)(&mut self.payload, p);
+        }
+
+        self.payload
     }
 }
 
-impl<T: Send + 'static> RegisterEntry<UnsyncEntry, T> {
-    pub fn subscribe<M, R>(mut self, cfg: R::Config) -> Self
+impl<T, F, P, B> RegisterEntry<UnsyncEntry, T, F, P, B> {
+    pub fn subscribe<M, S, R, E>(mut self, queue: u64, cfg: S::Config) -> Self
     where
         T: Send + 'static,
-        M: Message + 'static,
-        R: ReceiverSubscriberBuilder<M, T> + 'static,
+        M: Message,
+        R: Message,
+        E: StdSyncSendError,
+        S: ReceiverSubscriberBuilder<T, M, R, E> + 'static,
     {
-        let (inner, poller) = R::build(cfg).subscribe();
+        let (inner, poller) = S::build(cfg);
 
-        let receiver = Receiver::new(inner);
-        self.receivers
-            .entry(TypeId::of::<M>())
-            .or_insert_with(Vec::new)
-            .push((receiver, poller));
+        let receiver = Receiver::new::<M, R, E, S>(
+            RECEVIER_ID_SEQ.fetch_add(1, Ordering::Relaxed),
+            queue,
+            true,
+            inner,
+        );
+
+        let poller2 = receiver.start_polling();
+        self.receivers.insert(receiver);
+        self.pollers.push(poller(self.item.clone()));
+        self.pollers.push(poller2);
 
         self
     }
+
+    #[inline]
+    pub fn subscribe_sync<M>(self, queue: u64, cfg: receivers::SynchronizedConfig) -> Self
+    where
+        T: SynchronizedHandler<M> + Send + 'static,
+        M: Message,
+        T::Response: Message,
+    {
+        self.subscribe::<M, receivers::SynchronizedSync<M, T::Response, T::Error>, T::Response, T::Error>(queue, cfg)
+    }
+
+    #[inline]
+    pub fn subscribe_async<M>(self, queue: u64, cfg: receivers::SynchronizedConfig) -> Self
+    where
+        T: AsyncSynchronizedHandler<M> + Send + 'static,
+        M: Message,
+        T::Response: Message,
+    {
+        self.subscribe::<M, receivers::SynchronizedAsync<M, T::Response, T::Error>, T::Response, T::Error>(queue, cfg)
+    }
+
+    #[inline]
+    pub fn subscribe_batch_sync<M>(
+        self,
+        queue: u64,
+        cfg: receivers::SynchronizedBatchedConfig,
+    ) -> Self
+    where
+        T: BatchSynchronizedHandler<M> + Send + 'static,
+        M: Message,
+        T::Response: Message,
+    {
+        self.subscribe::<M, receivers::SynchronizedBatchedSync<M, T::Response, T::Error>, T::Response, T::Error>(queue, cfg)
+    }
+
+    #[inline]
+    pub fn subscribe_batch_async<M>(
+        self,
+        queue: u64,
+        cfg: receivers::SynchronizedBatchedConfig,
+    ) -> Self
+    where
+        T: AsyncBatchSynchronizedHandler<M> + Send + 'static,
+        M: Message,
+        T::Response: Message,
+    {
+        self.subscribe::<M, receivers::SynchronizedBatchedAsync<M, T::Response, T::Error>, T::Response, T::Error>(queue, cfg)
+    }
 }
 
-impl<T: Send + Sync + 'static> RegisterEntry<SyncEntry, T> {
-    pub fn subscribe<M, R>(mut self, cfg: R::Config) -> Self
+impl<T, F, P, B> RegisterEntry<SyncEntry, T, F, P, B> {
+    pub fn subscribe<M, S, R, E>(mut self, queue: u64, cfg: S::Config) -> Self
     where
-        T: Send + 'static,
-        M: Message + 'static,
-        R: ReceiverSubscriberBuilder<M, T> + 'static,
+        T: Send + Sync + 'static,
+        M: Message,
+        R: Message,
+        E: StdSyncSendError,
+        S: ReceiverSubscriberBuilder<T, M, R, E> + 'static,
     {
-        let (inner, poller) = R::build(cfg).subscribe();
+        let (inner, poller) = S::build(cfg);
 
-        let receiver = Receiver::new(inner);
-        self.receivers
-            .entry(TypeId::of::<M>())
-            .or_insert_with(Vec::new)
-            .push((receiver, poller));
+        let receiver = Receiver::new::<M, R, E, S>(
+            RECEVIER_ID_SEQ.fetch_add(1, Ordering::Relaxed),
+            queue,
+            true,
+            inner,
+        );
+        let poller2 = receiver.start_polling();
+        self.receivers.insert(receiver);
+        self.pollers.push(poller(self.item.clone()));
+        self.pollers.push(poller2);
+
+        self
+    }
+
+    #[inline]
+    pub fn subscribe_sync<M>(self, queue: u64, cfg: receivers::BufferUnorderedConfig) -> Self
+    where
+        T: Handler<M> + Send + Sync + 'static,
+        M: Message,
+        T::Response: Message,
+    {
+        self.subscribe::<M, receivers::BufferUnorderedSync<M, T::Response, T::Error>, T::Response, T::Error>(queue, cfg)
+    }
+
+    #[inline]
+    pub fn subscribe_async<M>(self, queue: u64, cfg: receivers::BufferUnorderedConfig) -> Self
+    where
+        T: AsyncHandler<M> + Send + Sync + 'static,
+        M: Message,
+        T::Response: Message,
+        T::Error: StdSyncSendError,
+    {
+        self.subscribe::<M, receivers::BufferUnorderedAsync<M, T::Response, T::Error>, T::Response, T::Error>(queue, cfg)
+    }
+
+    #[inline]
+    pub fn subscribe_batch_sync<M>(
+        self,
+        queue: u64,
+        cfg: receivers::BufferUnorderedBatchedConfig,
+    ) -> Self
+    where
+        T: BatchHandler<M> + Send + 'static,
+        M: Message,
+        T::Response: Message,
+    {
+        self.subscribe::<M, receivers::BufferUnorderedBatchedSync<M, T::Response, T::Error>, T::Response, T::Error>(queue, cfg)
+    }
+
+    #[inline]
+    pub fn subscribe_batch_async<M>(
+        self,
+        queue: u64,
+        cfg: receivers::BufferUnorderedBatchedConfig,
+    ) -> Self
+    where
+        T: AsyncBatchHandler<M> + Send + 'static,
+        M: Message,
+        T::Response: Message,
+    {
+        self.subscribe::<M, receivers::BufferUnorderedBatchedAsync<M, T::Response, T::Error>, T::Response, T::Error>(queue, cfg)
+    }
+}
+
+#[derive(Default)]
+pub struct Module {
+    receivers: HashSet<Receiver>,
+    pollings: Vec<BusPollerCallback>,
+}
+
+impl Module {
+    pub fn new() -> Self {
+        Self {
+            receivers: HashSet::new(),
+            pollings: Vec::new(),
+        }
+    }
+
+    pub fn register_relay<S: Relay + Send + Sync + 'static>(mut self, inner: S) -> Self {
+        let receiver =
+            Receiver::new_relay::<S>(RECEVIER_ID_SEQ.fetch_add(1, Ordering::Relaxed), inner);
+        self.pollings.push(receiver.start_polling());
+        self.receivers.insert(receiver);
+
+        self
+    }
+
+    pub fn register<T: Send + Sync + 'static>(
+        self,
+        item: T,
+    ) -> RegisterEntry<
+        SyncEntry,
+        T,
+        impl FnMut(&mut Self, Receiver),
+        impl FnMut(&mut Self, Box<dyn FnOnce(Bus) -> Pin<Box<dyn Future<Output = ()> + Send>>>),
+        Self,
+    > {
+        RegisterEntry {
+            item: Arc::new(item) as Untyped,
+            payload: self,
+            builder: |p: &mut Self, r| {
+                p.receivers.insert(r);
+            },
+            poller: |p: &mut Self, poller| p.pollings.push(poller),
+            receivers: HashSet::new(),
+            pollers: Vec::new(),
+            _m: Default::default(),
+        }
+    }
+
+    pub fn register_unsync<T: Send + 'static>(
+        self,
+        item: T,
+    ) -> RegisterEntry<
+        UnsyncEntry,
+        T,
+        impl FnMut(&mut Self, Receiver),
+        impl FnMut(&mut Self, Box<dyn FnOnce(Bus) -> Pin<Box<dyn Future<Output = ()> + Send>>>),
+        Self,
+    > {
+        let item = Arc::new(Mutex::new(item)) as Untyped;
+
+        RegisterEntry {
+            item,
+            payload: self,
+            builder: |p: &mut Self, r| {
+                p.receivers.insert(r);
+            },
+            poller: |p: &mut Self, poller| p.pollings.push(poller),
+            receivers: HashSet::new(),
+            pollers: Vec::new(),
+            _m: Default::default(),
+        }
+    }
+
+    pub fn add_module(mut self, module: Module) -> Self {
+        self.pollings.extend(module.pollings);
+        self.receivers.extend(module.receivers);
 
         self
     }
 }
 
 pub struct BusBuilder {
-    receivers: Vec<(TypeId, Receiver)>,
-    pollings: Vec<Box<dyn FnOnce(Bus) -> Pin<Box<dyn Future<Output = ()> + Send>>>>,
+    inner: Module,
 }
 
 impl BusBuilder {
-    pub fn new() -> Self {
+    pub(crate) fn new() -> Self {
         Self {
-            receivers: Vec::new(),
-            pollings: Vec::new(),
+            inner: Module::new(),
         }
     }
 
-    pub fn register<T: Send + Sync + 'static>(self, item: T) -> RegisterEntry<SyncEntry, T> {
+    pub fn register_relay<S: Relay + Send + Sync + 'static>(self, inner: S) -> Self {
+        let inner = self.inner.register_relay(inner);
+
+        BusBuilder { inner }
+    }
+
+    pub fn register<T: Send + Sync + 'static>(
+        self,
+        item: T,
+    ) -> RegisterEntry<
+        SyncEntry,
+        T,
+        impl FnMut(&mut Self, Receiver),
+        impl FnMut(&mut Self, Box<dyn FnOnce(Bus) -> Pin<Box<dyn Future<Output = ()> + Send>>>),
+        Self,
+    > {
         RegisterEntry {
             item: Arc::new(item) as Untyped,
-            builder: self,
-            receivers: HashMap::new(),
+            payload: self,
+            builder: |p: &mut Self, r| {
+                p.inner.receivers.insert(r);
+            },
+            poller: |p: &mut Self, poller| p.inner.pollings.push(poller),
+            receivers: HashSet::new(),
+            pollers: Vec::new(),
             _m: Default::default(),
         }
     }
 
-    pub fn register_unsync<T: Send + 'static>(self, item: T) -> RegisterEntry<UnsyncEntry, T> {
+    pub fn register_unsync<T: Send + 'static>(
+        self,
+        item: T,
+    ) -> RegisterEntry<
+        UnsyncEntry,
+        T,
+        impl FnMut(&mut Self, Receiver),
+        impl FnMut(&mut Self, Box<dyn FnOnce(Bus) -> Pin<Box<dyn Future<Output = ()> + Send>>>),
+        Self,
+    > {
         RegisterEntry {
             item: Arc::new(Mutex::new(item)) as Untyped,
-            builder: self,
-            receivers: HashMap::new(),
+            payload: self,
+            builder: |p: &mut Self, r| {
+                p.inner.receivers.insert(r);
+            },
+            poller: |p: &mut Self, poller| p.inner.pollings.push(poller),
+            receivers: HashSet::new(),
+            pollers: Vec::new(),
             _m: Default::default(),
         }
     }
 
-    pub fn add_recevier(
-        &mut self,
-        val: (TypeId, Receiver),
-        poller: Box<dyn FnOnce(Bus) -> Pin<Box<dyn Future<Output = ()> + Send>>>,
-    ) {
-        self.receivers.push(val);
-        self.pollings.push(poller);
+    pub fn add_module(mut self, module: Module) -> Self {
+        self.inner = self.inner.add_module(module);
+
+        self
     }
 
     pub fn build(self) -> (Bus, impl Future<Output = ()>) {
         let bus = Bus {
-            inner: Arc::new(BusInner::new(self.receivers)),
+            inner: Arc::new(BusInner::new(self.inner.receivers)),
         };
 
-        let mut futs = Vec::with_capacity(self.pollings.len());
-        for poller in self.pollings {
+        let mut futs = Vec::with_capacity(self.inner.pollings.len() * 2);
+        for poller in self.inner.pollings {
             futs.push(tokio::task::spawn(poller(bus.clone())));
         }
 
         let poller = futures::future::join_all(futs).map(|_| ()).map(|_| ());
 
+        bus.init();
+
         (bus, poller)
     }
 }

src/envelop.rs

@@ -1,102 +1,462 @@
-use core::any::{self, Any};
-use core::fmt;
-// use erased_serde::{Deserializer, Serialize};
+use core::{
+    any::{type_name, Any},
+    fmt,
+};
 
-pub trait Message: Any + fmt::Debug/*Serialize + for<'a> Deserializer<'a> + */ + Unpin + Clone + Send + Sync + 'static {}
-impl<T: Any + fmt::Debug + Unpin + Clone + Send + Sync> Message for T {}
+use std::{alloc::Layout, borrow::Cow, sync::Arc};
 
-trait SafeMessage: Any + fmt::Debug/*+ Serialize + for<'a> Deserializer<'a>*/ + Unpin + Send + Sync + 'static {
-    fn type_name(&self) -> &'static str;
-    fn clone_boxed(&self) -> Box<dyn SafeMessage>;
+pub trait MessageBounds: TypeTagged + fmt::Debug + Unpin + Send + Sync + 'static {}
+impl<T: TypeTagged + fmt::Debug + Unpin + Send + Sync + 'static> MessageBounds for T {}
+
+pub type TypeTag = Cow<'static, str>;
+
+pub trait TypeTagged {
+    fn type_tag_() -> TypeTag
+    where
+        Self: Sized;
+
+    fn type_tag(&self) -> TypeTag;
+    fn type_name(&self) -> Cow<str>;
+    fn type_layout(&self) -> Layout;
 }
 
-impl<T: Message> SafeMessage for T {
-    fn type_name(&self) -> &'static str {
-        any::type_name::<T>()
+pub trait Message: MessageBounds {
+    fn as_any_ref(&self) -> &dyn Any;
+    fn as_any_mut(&mut self) -> &mut dyn Any;
+    fn as_any_boxed(self: Box<Self>) -> Box<dyn Any>;
+    fn as_any_arc(self: Arc<Self>) -> Arc<dyn Any>;
+
+    fn as_shared_ref(&self) -> Option<&dyn SharedMessage>;
+    fn as_shared_mut(&mut self) -> Option<&mut dyn SharedMessage>;
+    fn as_shared_boxed(self: Box<Self>) -> Result<Box<dyn SharedMessage>, Box<dyn Message>>;
+    fn as_shared_arc(self: Arc<Self>) -> Option<Arc<dyn SharedMessage>>;
+
+    fn try_clone_into(&self, into: &mut dyn Any) -> bool;
+    fn try_clone_boxed(&self) -> Option<Box<dyn Message>>;
+
+    fn try_clone(&self) -> Option<Self>
+    where
+        Self: Sized;
+}
+
+macro_rules! gen_impls {
+    ($t:ty, $($rest:tt)*) => {
+        impl TypeTagged for $t {
+            fn type_tag_() -> TypeTag {
+                type_name::<$t>().into()
+            }
+            fn type_tag(&self) -> TypeTag {
+                type_name::<$t>().into()
+            }
+            fn type_name(&self) -> Cow<str> {
+                type_name::<$t>().into()
+            }
+            fn type_layout(&self) -> Layout {
+                Layout::for_value(self)
+            }
         }
 
-    fn clone_boxed(&self) -> Box<dyn SafeMessage> {
-        Box::new(self.clone())
+        gen_impls!{ $($rest)* }
+    };
+
+    ($t:ty) => {
+        impl TypeTagged for $t {
+            fn type_tag_() -> TypeTag {
+                type_name::<$t>().into()
+            }
+            fn type_tag(&self) -> TypeTag {
+                type_name::<$t>().into()
+            }
+            fn type_name(&self) -> Cow<str> {
+                type_name::<$t>().into()
+            }
+            fn type_layout(&self) -> Layout {
+                Layout::for_value(self)
+            }
+        }
+    };
+}
+
+gen_impls! {
+    (), bool,
+    i8, u8,
+    i16, u16,
+    i32, u32,
+    i64, u64,
+    i128, u128,
+    f32, f64,
+    String
+}
+
+impl<T: TypeTagged> TypeTagged for Arc<T> {
+    fn type_tag_() -> TypeTag {
+        T::type_tag_()
+    }
+
+    fn type_tag(&self) -> TypeTag {
+        T::type_tag(&*self)
+    }
+    fn type_name(&self) -> Cow<str> {
+        T::type_name(&*self)
+    }
+    fn type_layout(&self) -> Layout {
+        Layout::for_value(self)
     }
 }
 
-// pub struct BoxedEnvelop {
-//     inner: Box<dyn SafeMessage>,
-// }
+impl<T: TypeTagged> TypeTagged for Box<T> {
+    fn type_tag_() -> TypeTag {
+        T::type_tag_()
+    }
 
-// impl BoxedEnvelop {
-//     pub fn from_message<M: Message>(m: M) -> Self {
-//         Self {
-//             inner: Box::new(m)
-//         }
-//     }
-
-//     pub fn as_ref(&self) -> Envelop<'_> {
-//         Envelop { inner: &*self.inner }
-//     }
-
-//     pub fn downcast<T: 'static>(self) -> Option<Box<T>> {
-//         if (*self.inner).type_id() == TypeId::of::<T>() {
-//             unsafe {
-//                 let raw: *mut dyn SafeMessage = Box::into_raw(self.inner);
-
-//                 Some(Box::from_raw(raw as *mut T))
-//             }
-//         } else {
-//             None
-//         }
-//     }
-// }
-
-#[derive(Copy, Clone)]
-pub struct Envelop<'inner> {
-    inner: &'inner dyn SafeMessage,
-}
-
-impl<'inner> fmt::Debug for Envelop<'inner> {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        write!(f, "Envelop(")?;
-        self.inner.fmt(f)?;
-        write!(f, ")")?;
-
-        Ok(())
+    fn type_tag(&self) -> TypeTag {
+        T::type_tag(&*self)
+    }
+    fn type_name(&self) -> Cow<str> {
+        T::type_name(&*self)
+    }
+    fn type_layout(&self) -> Layout {
+        Layout::for_value(self)
     }
 }
 
-impl<'inner> Envelop<'inner> {
-    // pub fn new<T: Message>(inner: &'inner T) -> Self {
-    //     Self { inner }
-    // }
+impl Message for () {
+    fn as_any_ref(&self) -> &dyn Any {
+        self
+    }
+    fn as_any_mut(&mut self) -> &mut dyn Any {
+        self
+    }
+    fn as_any_boxed(self: Box<Self>) -> Box<dyn Any> {
+        self
+    }
+    fn as_any_arc(self: Arc<Self>) -> Arc<dyn Any> {
+        self
+    }
 
-    // #[inline]
-    // pub fn downcast_to<T: 'static>(&self) -> Option<&T> {
-    //     if self.inner.type_id() == TypeId::of::<T>() {
-    //         unsafe { Some(&*(self.inner as *const dyn SafeMessage as *const T)) }
-    //     } else {
-    //         None
-    //     }
-    // }
+    fn as_shared_ref(&self) -> Option<&dyn SharedMessage> {
+        Some(self)
+    }
+    fn as_shared_mut(&mut self) -> Option<&mut dyn SharedMessage> {
+        Some(self)
+    }
+    fn as_shared_boxed(self: Box<Self>) -> Result<Box<dyn SharedMessage>, Box<dyn Message>> {
+        Ok(self)
+    }
+    fn as_shared_arc(self: Arc<Self>) -> Option<Arc<dyn SharedMessage>> {
+        Some(self)
+    }
+    fn try_clone_into(&self, into: &mut dyn Any) -> bool {
+        let into = if let Some(inner) = into.downcast_mut::<Option<()>>() {
+            inner
+        } else {
+            return false;
+        };
 
-    // #[inline]
-    // pub fn type_id(&self) -> TypeId {
-    //     self.inner.type_id()
-    // }
+        into.replace(());
+        true
+    }
+    fn try_clone_boxed(&self) -> Option<Box<dyn Message>> {
+        Some(Box::new(()))
+    }
 
-    // #[inline]
-    // pub fn type_name(&self) -> &'static str {
-    //     self.inner.type_name()
-    // }
-
-    // #[inline]
-    // pub fn clone_boxed(&self) -> BoxedEnvelop {
-    //     BoxedEnvelop {
-    //         inner: self.inner.clone_boxed(),
-    //     }
-    // }
+    fn try_clone(&self) -> Option<Self> {
+        Some(())
+    }
 }
 
-// impl<'inner> serde::Serialize for Envelop<'inner> {
-//     fn serialize<S: serde::Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
-//         erased_serde::serialize(self.inner, serializer)
+pub trait IntoBoxedMessage {
+    fn into_boxed(self) -> Box<dyn Message>;
+}
+
+impl<T: Message> IntoBoxedMessage for T {
+    fn into_boxed(self) -> Box<dyn Message> {
+        Box::new(self)
+    }
+}
+
+pub trait IntoSharedMessage {
+    fn into_shared(self) -> Box<dyn SharedMessage>;
+}
+
+impl<T: Message + serde::Serialize> IntoSharedMessage for T {
+    fn into_shared(self) -> Box<dyn SharedMessage> {
+        Box::new(self)
+    }
+}
+
+pub trait SharedMessage: Message + erased_serde::Serialize {
+    fn upcast_arc(self: Arc<Self>) -> Arc<dyn Message>;
+    fn upcast_box(self: Box<Self>) -> Box<dyn Message>;
+    fn upcast_ref(&self) -> &dyn Message;
+    fn upcast_mut(&mut self) -> &mut dyn Message;
+}
+impl<T: Message + erased_serde::Serialize> SharedMessage for T {
+    fn upcast_arc(self: Arc<Self>) -> Arc<dyn Message> {
+        self
+    }
+    fn upcast_box(self: Box<Self>) -> Box<dyn Message> {
+        self
+    }
+    fn upcast_ref(&self) -> &dyn Message {
+        self
+    }
+    fn upcast_mut(&mut self) -> &mut dyn Message {
+        self
+    }
+}
+
+// pub trait IntoTakeable {
+//     fn into_takeable(&mut self) -> Takeable<'_>;
+// }
+
+// impl<T: 'static> IntoTakeable for Option<T> {
+//     fn into_takeable(&mut self) -> Takeable<'_> {
+//         Takeable {
+//             inner_ref: self
 //         }
 //     }
+// }
+
+// pub struct Takeable<'a> {
+//     inner_ref: &'a mut dyn Any,
+// }
+
+// impl Takeable<'_> {
+//     pub fn take<M: Message>(&mut self) -> Option<M> {
+//         let m = self.inner_ref.downcast_mut::<Option<M>>()?;
+//         m.take()
+//     }
+// }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use erased_serde::Serializer;
+    use std::{any::type_name, borrow::Cow};
+
+    #[derive(Debug, Clone)]
+    struct Msg0;
+
+    impl TypeTagged for Msg0 {
+        fn type_tag_() -> TypeTag {
+            type_name::<Self>().into()
+        }
+        fn type_tag(&self) -> TypeTag {
+            type_name::<Self>().into()
+        }
+        fn type_name(&self) -> Cow<str> {
+            type_name::<Self>().into()
+        }
+        fn type_layout(&self) -> Layout {
+            Layout::for_value(self)
+        }
+    }
+
+    impl Message for Msg0 {
+        fn as_any_ref(&self) -> &dyn Any {
+            self
+        }
+        fn as_any_mut(&mut self) -> &mut dyn Any {
+            self
+        }
+        fn as_any_boxed(self: Box<Self>) -> Box<dyn Any> {
+            self
+        }
+        fn as_any_arc(self: Arc<Self>) -> Arc<dyn Any> {
+            self
+        }
+
+        fn as_shared_ref(&self) -> Option<&dyn SharedMessage> {
+            None
+        }
+        fn as_shared_mut(&mut self) -> Option<&mut dyn SharedMessage> {
+            None
+        }
+        fn as_shared_boxed(self: Box<Self>) -> Result<Box<dyn SharedMessage>, Box<dyn Message>> {
+            Err(self)
+        }
+        fn as_shared_arc(self: Arc<Self>) -> Option<Arc<dyn SharedMessage>> {
+            None
+        }
+        fn try_clone_into(&self, _: &mut dyn Any) -> bool {
+            false
+        }
+        fn try_clone_boxed(&self) -> Option<Box<dyn Message>> {
+            None
+        }
+
+        fn try_clone(&self) -> Option<Self> {
+            None
+        }
+    }
+
+    #[derive(Debug, Clone)]
+    struct Msg1;
+
+    impl TypeTagged for Msg1 {
+        fn type_tag_() -> TypeTag {
+            type_name::<Self>().into()
+        }
+        fn type_tag(&self) -> TypeTag {
+            type_name::<Self>().into()
+        }
+        fn type_name(&self) -> Cow<str> {
+            type_name::<Self>().into()
+        }
+        fn type_layout(&self) -> Layout {
+            Layout::for_value(self)
+        }
+    }
+
+    impl Message for Msg1 {
+        fn as_any_ref(&self) -> &dyn Any {
+            self
+        }
+        fn as_any_mut(&mut self) -> &mut dyn Any {
+            self
+        }
+        fn as_any_boxed(self: Box<Self>) -> Box<dyn Any> {
+            self
+        }
+        fn as_any_arc(self: Arc<Self>) -> Arc<dyn Any> {
+            self
+        }
+
+        fn as_shared_ref(&self) -> Option<&dyn SharedMessage> {
+            None
+        }
+        fn as_shared_mut(&mut self) -> Option<&mut dyn SharedMessage> {
+            None
+        }
+        fn as_shared_boxed(self: Box<Self>) -> Result<Box<dyn SharedMessage>, Box<dyn Message>> {
+            Err(self)
+        }
+        fn as_shared_arc(self: Arc<Self>) -> Option<Arc<dyn SharedMessage>> {
+            None
+        }
+        fn try_clone_into(&self, into: &mut dyn Any) -> bool {
+            let into = if let Some(inner) = into.downcast_mut::<Option<Msg1>>() {
+                inner
+            } else {
+                return false;
+            };
+
+            into.replace(self.clone());
+            true
+        }
+        fn try_clone_boxed(&self) -> Option<Box<dyn Message>> {
+            Some(Box::new(self.clone()))
+        }
+
+        fn try_clone(&self) -> Option<Self> {
+            Some(self.clone())
+        }
+    }
+
+    #[derive(Debug, Clone, serde_derive::Serialize, serde_derive::Deserialize)]
+    struct Msg2 {
+        inner: [i32; 2],
+    }
+
+    impl TypeTagged for Msg2 {
+        fn type_tag_() -> TypeTag {
+            type_name::<Self>().into()
+        }
+        fn type_tag(&self) -> TypeTag {
+            type_name::<Self>().into()
+        }
+        fn type_name(&self) -> Cow<str> {
+            type_name::<Self>().into()
+        }
+        fn type_layout(&self) -> Layout {
+            Layout::for_value(self)
+        }
+    }
+
+    impl Message for Msg2 {
+        fn as_any_ref(&self) -> &dyn Any {
+            self
+        }
+        fn as_any_mut(&mut self) -> &mut dyn Any {
+            self
+        }
+        fn as_any_boxed(self: Box<Self>) -> Box<dyn Any> {
+            self
+        }
+        fn as_any_arc(self: Arc<Self>) -> Arc<dyn Any> {
+            self
+        }
+
+        fn as_shared_ref(&self) -> Option<&dyn SharedMessage> {
+            Some(self)
+        }
+        fn as_shared_mut(&mut self) -> Option<&mut dyn SharedMessage> {
+            Some(self)
+        }
+        fn as_shared_boxed(self: Box<Self>) -> Result<Box<dyn SharedMessage>, Box<dyn Message>> {
+            Ok(self)
+        }
+        fn as_shared_arc(self: Arc<Self>) -> Option<Arc<dyn SharedMessage>> {
+            Some(self)
+        }
+        fn try_clone_into(&self, into: &mut dyn Any) -> bool {
+            let into = if let Some(inner) = into.downcast_mut::<Option<Msg2>>() {
+                inner
+            } else {
+                return false;
+            };
+
+            into.replace(self.clone());
+            true
+        }
+        fn try_clone_boxed(&self) -> Option<Box<dyn Message>> {
+            Some(Box::new(self.clone()))
+        }
+
+        fn try_clone(&self) -> Option<Self> {
+            Some(self.clone())
+        }
+    }
+
+    #[test]
+    fn test_static_upcast() {
+        let mut buff: Vec<u8> = Vec::new();
+        let json = &mut serde_json::Serializer::new(&mut buff);
+        let mut json = <dyn Serializer>::erase(json);
+
+        let x = Msg1;
+        let y = Msg2 { inner: [12, 13] };
+
+        assert!(x.as_shared_ref().is_none());
+        assert!(y.as_shared_ref().is_some());
+        assert!(y
+            .as_shared_ref()
+            .unwrap()
+            .erased_serialize(&mut json)
+            .is_ok());
+        assert_eq!(buff.as_slice(), b"{\"inner\":[12,13]}");
+    }
+
+    #[test]
+    fn test_dyn_upcast() {
+        let mut buff: Vec<u8> = Vec::new();
+        let json = &mut serde_json::Serializer::new(&mut buff);
+        let mut json = <dyn Serializer>::erase(json);
+
+        let x = Msg1;
+        let y = Msg2 { inner: [12, 13] };
+
+        let x_dyn: &dyn Message = &x;
+        let y_dyn: &dyn Message = &y;
+
+        assert!(x_dyn.as_shared_ref().is_none());
+        assert!(y_dyn.as_shared_ref().is_some());
+        assert!(y_dyn
+            .as_shared_ref()
+            .unwrap()
+            .erased_serialize(&mut json)
+            .is_ok());
+        assert_eq!(buff.as_slice(), b"{\"inner\":[12,13]}");
+    }
+}

src/error.rs

@@ -0,0 +1,284 @@
+use core::fmt;
+use std::any::type_name;
+
+use thiserror::Error;
+use tokio::sync::oneshot;
+
+use crate::{
+    envelop::{IntoBoxedMessage, TypeTag, TypeTagged},
+    Message,
+};
+
+pub trait DynError: TypeTagged {
+    fn description(&self) -> String;
+}
+
+pub trait StdSyncSendError: std::error::Error + TypeTagged + Send + Sync + Unpin + 'static {}
+impl<T: std::error::Error + TypeTagged + Send + Sync + Unpin + 'static> StdSyncSendError for T {}
+
+#[derive(Debug)]
+pub struct GenericError {
+    pub type_tag: TypeTag,
+    pub description: String,
+}
+
+impl GenericError {
+    pub fn from_any<T: TypeTagged + fmt::Display>(err: T) -> Self {
+        GenericError {
+            type_tag: err.type_tag(),
+            description: format!("{}[{}]", err.type_tag(), err),
+        }
+    }
+
+    pub fn from_err(tt: TypeTag, err: impl fmt::Display) -> Self {
+        GenericError {
+            description: format!("{}[{}]", tt, err),
+            type_tag: tt,
+        }
+    }
+}
+
+impl fmt::Display for GenericError {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "GenericError({}): {}", self.type_tag, self.description)
+    }
+}
+
+impl std::error::Error for GenericError {}
+
+impl TypeTagged for GenericError {
+    fn type_tag_() -> TypeTag {
+        type_name::<GenericError>().into()
+    }
+
+    fn type_tag(&self) -> TypeTag {
+        type_name::<GenericError>().into()
+    }
+
+    fn type_name(&self) -> TypeTag {
+        type_name::<GenericError>().into()
+    }
+    fn type_layout(&self) -> std::alloc::Layout {
+        std::alloc::Layout::for_value(self)
+    }
+}
+
+#[derive(Debug, Error)]
+pub enum SendError<M: fmt::Debug> {
+    #[error("Closed")]
+    Closed(M),
+
+    #[error("Full")]
+    Full(M),
+}
+
+impl<M: fmt::Debug> SendError<M> {
+    pub fn map_msg<UM: fmt::Debug + 'static, F: FnOnce(M) -> UM>(self, f: F) -> SendError<UM> {
+        match self {
+            SendError::Closed(inner) => SendError::Closed(f(inner)),
+            SendError::Full(inner) => SendError::Full(f(inner)),
+        }
+    }
+}
+
+impl<M: Message> SendError<M> {
+    pub fn into_boxed(self) -> SendError<Box<dyn Message>> {
+        match self {
+            SendError::Closed(m) => SendError::Closed(m.into_boxed()),
+            SendError::Full(m) => SendError::Closed(m.into_boxed()),
+        }
+    }
+}
+
+#[derive(Debug, Error)]
+pub enum Error<M: fmt::Debug + 'static = (), E: StdSyncSendError = GenericError> {
+    #[error("Message Send Error: {0}")]
+    SendError(#[from] SendError<M>),
+
+    #[error("Message receiver dropped try again another receiver")]
+    TryAgain(M),
+
+    #[error("NoResponse")]
+    NoResponse,
+
+    #[error("NoReceivers")]
+    NoReceivers,
+
+    #[error("AddListenerError")]
+    AddListenerError,
+
+    #[error("MessageCastError")]
+    MessageCastError,
+
+    #[error("Not Ready")]
+    NotReady,
+
+    #[error("Other({0})")]
+    Other(E),
+
+    #[error("Serialization({0})")]
+    Serialization(#[from] erased_serde::Error),
+
+    #[error("Other({0})")]
+    OtherBoxed(Box<dyn StdSyncSendError>),
+
+    #[error("WrongMessageType()")]
+    WrongMessageType(M),
+
+    #[error("TypeTagNotRegistered({0})")]
+    TypeTagNotRegistered(TypeTag),
+
+    #[error("Unknown Error: {0}")]
+    Unknown(String),
+}
+
+impl<M: fmt::Debug + 'static, E: StdSyncSendError> Error<M, E> {
+    pub fn send_closed(m: M) -> Self {
+        Error::SendError(SendError::Closed(m))
+    }
+
+    pub fn send_full(m: M) -> Self {
+        Error::SendError(SendError::Full(m))
+    }
+
+    pub fn map_msg<UM: fmt::Debug + 'static, F: FnOnce(M) -> UM>(self, f: F) -> Error<UM, E> {
+        match self {
+            Error::SendError(inner) => Error::SendError(inner.map_msg(f)),
+            Error::TryAgain(inner) => Error::TryAgain(f(inner)),
+            Error::NoResponse => Error::NoResponse,
+            Error::NoReceivers => Error::NoReceivers,
+            Error::Serialization(s) => Error::Serialization(s),
+            Error::Other(inner) => Error::Other(inner),
+            Error::OtherBoxed(inner) => Error::OtherBoxed(inner),
+            Error::WrongMessageType(inner) => Error::WrongMessageType(f(inner)),
+            Error::AddListenerError => Error::AddListenerError,
+            Error::MessageCastError => Error::MessageCastError,
+            Error::TypeTagNotRegistered(tt) => Error::TypeTagNotRegistered(tt),
+            Error::NotReady => Error::NotReady,
+            Error::Unknown(msg) => Error::Unknown(msg),
+        }
+    }
+
+    pub fn map_err<UE: StdSyncSendError, F: FnOnce(E) -> UE>(self, f: F) -> Error<M, UE> {
+        match self {
+            Error::SendError(inner) => Error::SendError(inner),
+            Error::TryAgain(inner) => Error::TryAgain(inner),
+            Error::NoResponse => Error::NoResponse,
+            Error::NoReceivers => Error::NoReceivers,
+            Error::Serialization(s) => Error::Serialization(s),
+            Error::Other(inner) => Error::Other(f(inner)),
+            Error::OtherBoxed(inner) => Error::OtherBoxed(inner),
+            Error::WrongMessageType(inner) => Error::WrongMessageType(inner),
+            Error::AddListenerError => Error::AddListenerError,
+            Error::MessageCastError => Error::MessageCastError,
+            Error::TypeTagNotRegistered(tt) => Error::TypeTagNotRegistered(tt),
+            Error::NotReady => Error::NotReady,
+            Error::Unknown(msg) => Error::Unknown(msg),
+        }
+    }
+
+    pub fn try_unwrap(self) -> Result<E, Self> {
+        match self {
+            Error::Other(inner) => Ok(inner),
+            s => Err(s),
+        }
+    }
+}
+
+impl<M: Message, E: StdSyncSendError> Error<M, E> {
+    pub fn into_dyn(self) -> Error<M> {
+        match self {
+            Error::SendError(inner) => Error::SendError(inner),
+            Error::TryAgain(inner) => Error::TryAgain(inner),
+            Error::NoResponse => Error::NoResponse,
+            Error::NoReceivers => Error::NoReceivers,
+            Error::Serialization(s) => Error::Serialization(s),
+            Error::Other(inner) => Error::OtherBoxed(Box::new(inner) as _),
+            Error::OtherBoxed(inner) => Error::OtherBoxed(inner),
+            Error::WrongMessageType(inner) => Error::WrongMessageType(inner),
+            Error::AddListenerError => Error::AddListenerError,
+            Error::MessageCastError => Error::MessageCastError,
+            Error::TypeTagNotRegistered(tt) => Error::TypeTagNotRegistered(tt),
+            Error::NotReady => Error::NotReady,
+            Error::Unknown(msg) => Error::Unknown(msg),
+        }
+    }
+
+    pub fn map<U: From<Box<dyn StdSyncSendError>> + StdSyncSendError>(self) -> Error<M, U> {
+        match self {
+            Error::SendError(inner) => Error::SendError(inner),
+            Error::TryAgain(inner) => Error::TryAgain(inner),
+            Error::NoResponse => Error::NoResponse,
+            Error::NoReceivers => Error::NoReceivers,
+            Error::Serialization(s) => Error::Serialization(s),
+            Error::Other(_) => panic!("expected boxed error!"),
+            Error::OtherBoxed(inner) => Error::Other(inner.into()),
+            Error::WrongMessageType(inner) => Error::WrongMessageType(inner),
+            Error::AddListenerError => Error::AddListenerError,
+            Error::MessageCastError => Error::MessageCastError,
+            Error::TypeTagNotRegistered(tt) => Error::TypeTagNotRegistered(tt),
+            Error::NotReady => Error::NotReady,
+            Error::Unknown(msg) => Error::Unknown(msg),
+        }
+    }
+}
+
+impl<E: StdSyncSendError> Error<(), E> {
+    pub fn specify<M: fmt::Debug>(self) -> Error<M, E> {
+        match self {
+            Error::SendError(_) => panic!("cannot specify type on typed error"),
+            Error::TryAgain(_) => panic!("cannot specify type on typed error"),
+            Error::WrongMessageType(_) => panic!("cannot specify type on typed error"),
+            Error::NoResponse => Error::NoResponse,
+            Error::NoReceivers => Error::NoReceivers,
+            Error::Serialization(s) => Error::Serialization(s),
+            Error::Other(inner) => Error::Other(inner),
+            Error::OtherBoxed(inner) => Error::OtherBoxed(inner),
+            Error::AddListenerError => Error::AddListenerError,
+            Error::MessageCastError => Error::MessageCastError,
+            Error::TypeTagNotRegistered(tt) => Error::TypeTagNotRegistered(tt),
+            Error::NotReady => Error::NotReady,
+            Error::Unknown(msg) => Error::Unknown(msg),
+        }
+    }
+}
+
+impl<M: fmt::Debug, E: StdSyncSendError> From<oneshot::error::RecvError> for Error<M, E> {
+    fn from(_: oneshot::error::RecvError) -> Self {
+        Error::NoResponse
+    }
+}
+
+impl Error<Box<dyn Message>> {
+    pub fn from_typed<M: Message>(err: Error<M>) -> Self {
+        match err {
+            Error::SendError(SendError::Closed(m)) => {
+                Error::SendError(SendError::Closed(m.into_boxed()))
+            }
+            Error::SendError(SendError::Full(m)) => {
+                Error::SendError(SendError::Full(m.into_boxed()))
+            }
+            Error::TryAgain(inner) => Error::TryAgain(inner.into_boxed()),
+            Error::WrongMessageType(m) => Error::WrongMessageType(m.into_boxed()),
+            Error::NoResponse => Error::NoResponse,
+            Error::NoReceivers => Error::NoReceivers,
+            Error::Serialization(s) => Error::Serialization(s),
+            Error::Other(inner) => Error::Other(inner),
+            Error::OtherBoxed(inner) => Error::OtherBoxed(inner),
+            Error::AddListenerError => Error::AddListenerError,
+            Error::MessageCastError => Error::MessageCastError,
+            Error::TypeTagNotRegistered(tt) => Error::TypeTagNotRegistered(tt),
+            Error::NotReady => Error::NotReady,
+            Error::Unknown(msg) => Error::Unknown(msg),
+        }
+    }
+}
+
+// impl<M: fmt::Debug> Error<M> {
+//     pub fn downcast<E>(self) -> Result<E, Self> {
+//         match self {
+//             Error::OtherBoxed(inner) => Ok(),
+//             err => Err(err)
+//         }
+//     }
+// }

src/handler.rs

@@ -1,92 +1,173 @@
-use crate::{Bus, Message};
+use core::iter::FromIterator;
+use std::pin::Pin;
+
+use crate::{error::StdSyncSendError, Bus, Message};
 use async_trait::async_trait;
+use futures::Stream;
+
+#[derive(Debug, Clone, Copy)]
+pub struct ProducerStats {
+    pub completed: usize,
+    pub failed: usize,
+}
+
+#[async_trait]
+pub trait AsyncProducer<M: Message>: Send + Sync {
+    type Item: Message;
+    type Response: Message;
+    type Error: StdSyncSendError;
+
+    async fn producer(
+        &self,
+        msg: M,
+        bus: &Bus,
+    ) -> Result<Pin<Box<dyn Stream<Item = Result<Self::Item, Self::Error>> + Send + '_>>, Self::Error>;
+
+    async fn finish(&self, stats: ProducerStats, bus: &Bus) -> Result<Self::Response, Self::Error>;
+}
 
 pub trait Handler<M: Message>: Send + Sync {
-    fn handle(&self, msg: M, bus: &Bus) -> anyhow::Result<()>;
-    fn sync(&self, _bus: &Bus) -> anyhow::Result<()> {
+    type Error: StdSyncSendError;
+    type Response: Message;
+
+    fn handle(&self, msg: M, bus: &Bus) -> Result<Self::Response, Self::Error>;
+    fn sync(&self, _bus: &Bus) -> Result<(), Self::Error> {
         Ok(())
     }
 }
 
 #[async_trait]
 pub trait AsyncHandler<M: Message>: Send + Sync {
-    async fn handle(&self, msg: M, bus: &Bus) -> anyhow::Result<()>;
-    async fn sync(&self, _bus: &Bus) -> anyhow::Result<()> {
+    type Error: StdSyncSendError;
+    type Response: Message;
+
+    async fn handle(&self, msg: M, bus: &Bus) -> Result<Self::Response, Self::Error>;
+    async fn sync(&self, _bus: &Bus) -> Result<(), Self::Error> {
         Ok(())
     }
 }
 
 pub trait SynchronizedHandler<M: Message>: Send {
-    fn handle(&mut self, msg: M, bus: &Bus) -> anyhow::Result<()>;
-    fn sync(&mut self, _bus: &Bus) -> anyhow::Result<()> {
+    type Error: StdSyncSendError;
+    type Response: Message;
+
+    fn handle(&mut self, msg: M, bus: &Bus) -> Result<Self::Response, Self::Error>;
+    fn sync(&mut self, _bus: &Bus) -> Result<(), Self::Error> {
         Ok(())
     }
 }
 
 #[async_trait]
 pub trait AsyncSynchronizedHandler<M: Message>: Send {
-    async fn handle(&mut self, msg: M, bus: &Bus) -> anyhow::Result<()>;
-    async fn sync(&mut self, _bus: &Bus) -> anyhow::Result<()> {
+    type Error: StdSyncSendError;
+    type Response: Message;
+
+    async fn handle(&mut self, msg: M, bus: &Bus) -> Result<Self::Response, Self::Error>;
+    async fn sync(&mut self, _bus: &Bus) -> Result<(), Self::Error> {
         Ok(())
     }
 }
 
 pub trait BatchHandler<M: Message>: Send + Sync {
-    fn handle(&self, msg: Vec<M>, bus: &Bus) -> anyhow::Result<()>;
-    fn sync(&self, _bus: &Bus) -> anyhow::Result<()> {
+    type Error: StdSyncSendError + Clone;
+    type Response: Message;
+    type InBatch: FromIterator<M> + Send;
+    type OutBatch: IntoIterator<Item = Self::Response> + Send;
+
+    fn handle(&self, msg: Self::InBatch, bus: &Bus) -> Result<Self::OutBatch, Self::Error>;
+    fn sync(&self, _bus: &Bus) -> Result<(), Self::Error> {
         Ok(())
     }
 }
 
 #[async_trait]
 pub trait AsyncBatchHandler<M: Message>: Send + Sync {
-    async fn handle(&self, msg: Vec<M>, bus: &Bus) -> anyhow::Result<()>;
-    async fn sync(&self, _bus: &Bus) -> anyhow::Result<()> {
+    type Error: StdSyncSendError + Clone;
+    type Response: Message;
+    type InBatch: FromIterator<M> + Send;
+    type OutBatch: IntoIterator<Item = Self::Response> + Send;
+
+    async fn handle(&self, msg: Self::InBatch, bus: &Bus) -> Result<Self::OutBatch, Self::Error>;
+    async fn sync(&self, _bus: &Bus) -> Result<(), Self::Error> {
         Ok(())
     }
 }
 
 pub trait BatchSynchronizedHandler<M: Message>: Send {
-    fn handle(&mut self, msg: Vec<M>, bus: &Bus) -> anyhow::Result<()>;
-    fn sync(&mut self, _bus: &Bus) -> anyhow::Result<()> {
+    type Error: StdSyncSendError + Clone;
+    type Response: Message;
+    type InBatch: FromIterator<M> + Send;
+    type OutBatch: IntoIterator<Item = Self::Response> + Send;
+
+    fn handle(&mut self, msg: Self::InBatch, bus: &Bus) -> Result<Self::OutBatch, Self::Error>;
+    fn sync(&mut self, _bus: &Bus) -> Result<(), Self::Error> {
         Ok(())
     }
 }
 
 #[async_trait]
 pub trait AsyncBatchSynchronizedHandler<M: Message>: Send {
-    async fn handle(&mut self, msg: Vec<M>, bus: &Bus) -> anyhow::Result<()>;
-    async fn sync(&mut self, _bus: &Bus) -> anyhow::Result<()> {
+    type Error: StdSyncSendError + Clone;
+    type Response: Message;
+    type InBatch: FromIterator<M> + Send;
+    type OutBatch: IntoIterator<Item = Self::Response> + Send;
+
+    async fn handle(
+        &mut self,
+        msg: Self::InBatch,
+        bus: &Bus,
+    ) -> Result<Self::OutBatch, Self::Error>;
+    async fn sync(&mut self, _bus: &Bus) -> Result<(), Self::Error> {
         Ok(())
     }
 }
 
 pub trait LocalHandler<M: Message> {
-    fn handle(&mut self, msg: Vec<M>, bus: &Bus) -> anyhow::Result<()>;
-    fn sync(&mut self, _bus: &Bus) -> anyhow::Result<()> {
+    type Error: StdSyncSendError;
+    type Response: Message;
+
+    fn handle(&mut self, msg: Vec<M>, bus: &Bus) -> Result<Self::Response, Self::Error>;
+    fn sync(&mut self, _bus: &Bus) -> Result<(), Self::Error> {
         Ok(())
     }
 }
 
 #[async_trait]
 pub trait LocalAsyncHandler<M: Message> {
-    async fn handle(&mut self, msg: Vec<M>, bus: &Bus) -> anyhow::Result<()>;
-    async fn sync(&mut self, _bus: &Bus) -> anyhow::Result<()> {
+    type Error: StdSyncSendError;
+    type Response: Message;
+
+    async fn handle(&mut self, msg: Vec<M>, bus: &Bus) -> Result<Self::Response, Self::Error>;
+    async fn sync(&mut self, _bus: &Bus) -> Result<(), Self::Error> {
         Ok(())
     }
 }
 
 pub trait LocalBatchHandler<M: Message> {
-    fn handle(&mut self, msg: Vec<M>, bus: &Bus) -> anyhow::Result<()>;
-    fn sync(&mut self, _bus: &Bus) -> anyhow::Result<()> {
+    type Error: StdSyncSendError + Clone;
+    type Response: Message;
+    type InBatch: FromIterator<M> + Send;
+    type OutBatch: IntoIterator<Item = Self::Response> + Send;
+
+    fn handle(&mut self, msg: Self::InBatch, bus: &Bus) -> Result<Self::OutBatch, Self::Error>;
+    fn sync(&mut self, _bus: &Bus) -> Result<(), Self::Error> {
         Ok(())
     }
 }
 
 #[async_trait]
 pub trait LocalAsyncBatchHandler<M: Message> {
-    async fn handle(&mut self, msg: Vec<M>, bus: &Bus) -> anyhow::Result<()>;
-    async fn sync(&mut self, _bus: &Bus) -> anyhow::Result<()> {
+    type Error: StdSyncSendError + Clone;
+    type Response: Message;
+    type InBatch: FromIterator<M> + Send;
+    type OutBatch: IntoIterator<Item = Self::Response> + Send;
+
+    async fn handle(
+        &mut self,
+        msg: Self::InBatch,
+        bus: &Bus,
+    ) -> Result<Self::OutBatch, Self::Error>;
+    async fn sync(&mut self, _bus: &Bus) -> Result<(), Self::Error> {
         Ok(())
     }
 }

src/lib.rs

@@ -1,108 +1,124 @@
 mod builder;
 mod envelop;
+pub mod error;
 mod handler;
-pub mod msgs;
 mod receiver;
 pub mod receivers;
+mod relay;
+mod stats;
 mod trait_object;
-mod utils;
+pub mod type_tag;
+
+pub mod __reexport {
+    pub use ctor;
+    pub use serde;
+}
+
+#[macro_use]
+extern crate log;
+
+pub mod derive {
+    pub use messagebus_derive::*;
+}
+
+// privavte
+use core::{
+    any::Any,
+    sync::atomic::{AtomicBool, AtomicU64, Ordering},
+    time::Duration,
+};
+use smallvec::SmallVec;
+use std::{
+    collections::{HashMap, HashSet},
+    sync::Arc,
+};
+use tokio::sync::Mutex;
 
 use builder::BusBuilder;
-pub use envelop::Message;
+use error::{Error, SendError, StdSyncSendError};
+use receiver::{Permit, Receiver};
+use stats::Stats;
+
+// public
+pub use builder::Module;
+pub use ctor;
+pub use envelop::{IntoBoxedMessage, Message, MessageBounds, SharedMessage, TypeTag, TypeTagged};
 pub use handler::*;
-pub use receiver::SendError;
-use receiver::{Receiver, ReceiverStats};
-use utils::binary_search_range_by_key;
-
-use core::any::{Any, TypeId};
-use std::sync::{
-    atomic::{AtomicBool, Ordering},
-    Arc,
+pub use receiver::{
+    Action, Event, EventBoxed, ReciveTypedReceiver, ReciveUntypedReceiver, SendTypedReceiver,
+    SendUntypedReceiver, TypeTagAccept, TypeTagAcceptItem,
 };
-
+pub use relay::Relay;
+pub use type_tag::{deserialize_shared_message, register_shared_message};
 pub type Untyped = Arc<dyn Any + Send + Sync>;
-pub type Result = anyhow::Result<()>;
+
+type LookupQuery = (TypeTag, Option<TypeTag>, Option<TypeTag>);
+
+static ID_COUNTER: AtomicU64 = AtomicU64::new(1);
+
+#[derive(Debug, Clone, Copy, PartialEq)]
+pub enum SendOptions {
+    Broadcast,
+    Except(u64),
+    Direct(u64),
+    Random,
+    Balanced,
+}
+
+impl Default for SendOptions {
+    fn default() -> Self {
+        Self::Broadcast
+    }
+}
 
 pub struct BusInner {
-    receivers: Vec<(TypeId, Receiver)>,
+    receivers: HashSet<Receiver>,
+    lookup: HashMap<LookupQuery, SmallVec<[Receiver; 4]>>,
     closed: AtomicBool,
+    maintain: Mutex<()>,
 }
 
 impl BusInner {
-    pub(crate) fn new(mut receivers: Vec<(TypeId, Receiver)>) -> Self {
-        receivers.sort_unstable_by_key(|(k, _)| *k);
+    pub(crate) fn new(receivers: HashSet<Receiver>) -> Self {
+        let mut lookup = HashMap::new();
+        for recv in receivers.iter() {
+            for (msg, resp) in recv.iter_types() {
+                lookup
+                    .entry((msg.clone(), None, None))
+                    .or_insert_with(HashSet::new)
+                    .insert(recv.clone());
+
+                if let Some((resp, err)) = resp {
+                    lookup
+                        .entry((msg.clone(), Some(resp.clone()), None))
+                        .or_insert_with(HashSet::new)
+                        .insert(recv.clone());
+
+                    lookup
+                        .entry((msg.clone(), None, Some(err.clone())))
+                        .or_insert_with(HashSet::new)
+                        .insert(recv.clone());
+
+                    lookup
+                        .entry((msg, Some(resp), Some(err)))
+                        .or_insert_with(HashSet::new)
+                        .insert(recv.clone());
+                }
+            }
+        }
+
+        let lookup = lookup
+            .into_iter()
+            .map(|(k, v)| (k, v.into_iter().collect()))
+            .collect();
 
         Self {
             receivers,
+            lookup,
             closed: AtomicBool::new(false),
+            maintain: Mutex::new(()),
         }
     }
-
-    pub fn close(&self) {
-        self.closed.store(true, Ordering::SeqCst);
-
-        for (_, r) in &self.receivers {
-            r.close();
-        }
-    }
-
-    pub async fn sync(&self) {
-        for (_, r) in &self.receivers {
-            r.sync().await;
-        }
-    }
-
-    pub fn stats(&self) -> impl Iterator<Item = ReceiverStats> + '_ {
-        self.receivers.iter().map(|(_, r)| r.stats())
-    }
-
-    pub fn try_send<M: Message>(&self, msg: M) -> core::result::Result<(), SendError<M>> {
-        if self.closed.load(Ordering::SeqCst) {
-            println!("Bus closed. Skipping send!");
-            return Ok(());
-        }
-
-        let tid = TypeId::of::<M>();
-        let range = binary_search_range_by_key(&self.receivers, &tid, |(k, _)| *k);
-
-        for i in (range.start + 1)..range.end {
-            self.receivers[i].1.try_broadcast(msg.clone())?;
-        }
-
-        if let Some((_, r)) = self.receivers.get(range.start) {
-            r.try_broadcast(msg.clone())?;
-        } else {
-            println!("Unhandled message {:?}", core::any::type_name::<M>());
-        }
-
-        Ok(())
-    }
-
-    #[inline]
-    pub fn send_blocking<M: Message>(&self, msg: M) -> core::result::Result<(), SendError<M>> {
-        futures::executor::block_on(self.send(msg))
-    }
-
-    pub async fn send<M: Message>(&self, msg: M) -> core::result::Result<(), SendError<M>> {
-        if self.closed.load(Ordering::SeqCst) {
-            return Err(SendError::Closed(msg));
-        }
-
-        let tid = TypeId::of::<M>();
-        let range = binary_search_range_by_key(&self.receivers, &tid, |(k, _)| *k);
-
-        for i in (range.start + 1)..range.end {
-            self.receivers[i].1.broadcast(msg.clone()).await?;
-        }
-
-        if let Some((_, r)) = self.receivers.get(range.start) {
-            r.broadcast(msg.clone()).await?;
-        } else {
-            println!("Unhandled message {:?}", core::any::type_name::<M>());
-        }
-
-        Ok(())
-    }
 }
 
 #[derive(Clone)]
@@ -110,17 +126,696 @@ pub struct Bus {
     inner: Arc<BusInner>,
 }
 
-impl core::ops::Deref for Bus {
-    type Target = BusInner;
-
-    fn deref(&self) -> &Self::Target {
-        self.inner.as_ref()
-    }
-}
-
 impl Bus {
     #[inline]
     pub fn build() -> BusBuilder {
         BusBuilder::new()
     }
+
+    pub fn is_closing(&self) -> bool {
+        self.inner.closed.load(Ordering::SeqCst)
+    }
+
+    pub(crate) fn init(&self) {
+        for r in self.inner.receivers.iter() {
+            r.init(self).unwrap();
+        }
+    }
+
+    pub async fn ready(&self) {
+        for r in self.inner.receivers.iter() {
+            r.ready().await;
+        }
+    }
+
+    pub async fn close(&self) {
+        let _handle = self.inner.maintain.lock().await;
+        self.inner.closed.store(true, Ordering::SeqCst);
+
+        for r in self.inner.receivers.iter() {
+            let err = tokio::time::timeout(Duration::from_secs(20), r.close(self)).await;
+
+            if let Err(err) = err {
+                error!("Close timeout on {}: {}", r.name(), err);
+            }
+        }
+    }
+
+    pub async fn flush_all(&self) {
+        let fuse_count = 32i32;
+        let mut breaked = false;
+        let mut iters = 0usize;
+
+        for _ in 0..fuse_count {
+            iters += 1;
+            let mut flushed = false;
+            for r in self.inner.receivers.iter() {
+                if r.need_flush() {
+                    flushed = true;
+
+                    r.flush(self).await;
+                }
+            }
+
+            if !flushed {
+                breaked = true;
+                break;
+            }
+        }
+
+        if !breaked {
+            warn!(
+                "!!! WARNING: unable to reach equilibrium in {} iterations !!!",
+                fuse_count
+            );
+        } else {
+            info!("flushed in {} iterations !!!", iters);
+        }
+    }
+
+    pub async fn flush<M: Message>(&self) {
+        let fuse_count = 32i32;
+        let mut breaked = false;
+        let mut iters = 0usize;
+
+        for _ in 0..fuse_count {
+            let receivers =
+                self.select_receivers(M::type_tag_(), Default::default(), None, None, false);
+            iters += 1;
+            let mut flushed = false;
+            for r in receivers {
+                if r.need_flush() {
+                    flushed = true;
+
+                    r.flush(self).await;
+                }
+            }
+
+            if !flushed {
+                breaked = true;
+                break;
+            }
+        }
+
+        if !breaked {
+            warn!(
+                "!!! WARNING: unable to reach equilibrium in {} iterations !!!",
+                fuse_count
+            );
+        } else {
+            info!("flushed in {} iterations !!!", iters);
+        }
+    }
+
+    pub async fn flush2<M1: Message, M2: Message>(&self) {
+        let fuse_count = 32i32;
+        let mut breaked = false;
+        let mut iters = 0usize;
+        for _ in 0..fuse_count {
+            let receivers1 =
+                self.select_receivers(M1::type_tag_(), Default::default(), None, None, false);
+
+            let receivers2 =
+                self.select_receivers(M2::type_tag_(), Default::default(), None, None, false);
+
+            iters += 1;
+            let mut flushed = false;
+            for r in receivers1.chain(receivers2) {
+                if r.need_flush() {
+                    flushed = true;
+
+                    r.flush(self).await;
+                }
+            }
+
+            if !flushed {
+                breaked = true;
+                break;
+            }
+        }
+
+        if !breaked {
+            warn!(
+                "!!! WARNING: unable to reach equilibrium in {} iterations !!!",
+                fuse_count
+            );
+        } else {
+            info!("flushed in {} iterations !!!", iters);
+        }
+    }
+
+    pub async fn sync_all(&self) {
+        for r in self.inner.receivers.iter() {
+            r.sync(self).await;
+        }
+    }
+
+    pub async fn sync<M: Message>(&self) {
+        let receivers =
+            self.select_receivers(M::type_tag_(), Default::default(), None, None, false);
+
+        for r in receivers {
+            r.sync(self).await;
+        }
+    }
+
+    pub async fn sync2<M1: Message, M2: Message>(&self) {
+        let receivers1 =
+            self.select_receivers(M1::type_tag_(), Default::default(), None, None, false);
+
+        let receivers2 =
+            self.select_receivers(M2::type_tag_(), Default::default(), None, None, false);
+
+        for r in receivers1.chain(receivers2) {
+            r.sync(self).await;
+        }
+    }
+
+    pub async fn idle_all(&self) {
+        for r in self.inner.receivers.iter() {
+            r.flush(self).await;
+            r.idle().await;
+        }
+    }
+
+    pub async fn idle<M: Message>(&self) {
+        let receivers =
+            self.select_receivers(M::type_tag_(), Default::default(), None, None, false);
+
+        for r in receivers {
+            r.flush(self).await;
+            r.idle().await;
+        }
+    }
+
+    pub async fn idle2<M1: Message, M2: Message>(&self) {
+        let receivers1 =
+            self.select_receivers(M1::type_tag_(), Default::default(), None, None, false);
+
+        let receivers2 =
+            self.select_receivers(M2::type_tag_(), Default::default(), None, None, false);
+
+        for r in receivers1.chain(receivers2) {
+            r.flush(self).await;
+            r.idle().await;
+        }
+    }
+
+    #[inline]
+    pub async fn flush_and_sync_all(&self, force: bool) {
+        if !force {
+            self.idle_all().await;
+        }
+
+        println!("flushing all begin");
+        self.flush_all().await;
+        self.sync_all().await;
+    }
+
+    #[inline]
+    pub async fn flush_and_sync<M: Message>(&self, force: bool) {
+        if !force {
+            self.idle::<M>().await;
+        }
+
+        println!("flushing 1 begin");
+        self.flush::<M>().await;
+        self.sync::<M>().await;
+    }
+
+    #[inline]
+    pub async fn flush_and_sync2<M1: Message, M2: Message>(&self, force: bool) {
+        if !force {
+            self.idle2::<M1, M2>().await;
+        }
+        println!("flushing 2 begin");
+        self.flush2::<M1, M2>().await;
+        self.sync2::<M1, M2>().await;
+    }
+
+    fn try_reserve(&self, tt: &TypeTag, rs: &[Receiver]) -> Option<SmallVec<[Permit; 32]>> {
+        let mut permits = SmallVec::<[Permit; 32]>::new();
+
+        for r in rs {
+            if let Some(prmt) = r.try_reserve(tt) {
+                permits.push(prmt);
+            } else {
+                return None;
+            };
+        }
+
+        Some(permits)
+    }
+
+    #[inline]
+    pub fn try_send<M: Message + Clone>(&self, msg: M) -> Result<(), Error<M>> {
+        self.try_send_ext(msg, SendOptions::Broadcast)
+    }
+
+    pub fn try_send_ext<M: Message + Clone>(
+        &self,
+        msg: M,
+        _options: SendOptions,
+    ) -> core::result::Result<(), Error<M>> {
+        if self.inner.closed.load(Ordering::SeqCst) {
+            return Err(SendError::Closed(msg).into());
+        }
+
+        let tt = msg.type_tag();
+        let mid = ID_COUNTER.fetch_add(1, Ordering::Relaxed);
+
+        if let Some(rs) = self.inner.lookup.get(&(msg.type_tag(), None, None)) {
+            let permits = if let Some(x) = self.try_reserve(&tt, rs) {
+                x
+            } else {
+                return Err(SendError::Full(msg).into());
+            };
+
+            let mut iter = permits.into_iter().zip(rs.iter());
+            let mut counter = 1;
+            let total = rs.len();
+
+            while counter < total {
+                let (p, r) = iter.next().unwrap();
+                let _ = r.send(self, mid, msg.clone(), false, p);
+
+                counter += 1;
+            }
+
+            if let Some((p, r)) = iter.next() {
+                let _ = r.send(self, mid, msg, false, p);
+                return Ok(());
+            }
+        }
+
+        warn!(
+            "Unhandled message {:?}: no receivers",
+            core::any::type_name::<M>()
+        );
+
+        Ok(())
+    }
+
+    #[inline]
+    pub fn send_blocking<M: Message + Clone>(&self, msg: M) -> Result<(), Error<M>> {
+        self.send_blocking_ext(msg, SendOptions::Broadcast)
+    }
+
+    #[inline]
+    pub fn send_blocking_ext<M: Message + Clone>(
+        &self,
+        msg: M,
+        options: SendOptions,
+    ) -> core::result::Result<(), Error<M>> {
+        futures::executor::block_on(self.send_ext(msg, options))
+    }
+
+    #[inline]
+    pub async fn send<M: Message + Clone>(&self, msg: M) -> core::result::Result<(), Error<M>> {
+        Ok(self.send_ext(msg, SendOptions::Broadcast).await?)
+    }
+
+    pub async fn send_ext<M: Message + Clone>(
+        &self,
+        msg: M,
+        _options: SendOptions,
+    ) -> core::result::Result<(), Error<M>> {
+        if self.inner.closed.load(Ordering::SeqCst) {
+            return Err(SendError::Closed(msg).into());
+        }
+
+        let tt = msg.type_tag();
+        let mid = ID_COUNTER.fetch_add(1, Ordering::Relaxed);
+
+        if let Some(rs) = self.inner.lookup.get(&(msg.type_tag(), None, None)) {
+            if let Some((last, head)) = rs.split_last() {
+                for r in head {
+                    let _ = r.send(self, mid, msg.clone(), false, r.reserve(&tt).await);
+                }
+
+                let _ = last.send(self, mid, msg, false, last.reserve(&tt).await);
+
+                return Ok(());
+            }
+        }
+
+        warn!(
+            "Unhandled message {:?}: no receivers",
+            core::any::type_name::<M>()
+        );
+
+        Ok(())
+    }
+
+    #[inline]
+    pub fn force_send<M: Message + Clone>(&self, msg: M) -> Result<(), Error<M>> {
+        self.force_send_ext(msg, SendOptions::Broadcast)
+    }
+
+    pub fn force_send_ext<M: Message + Clone>(
+        &self,
+        msg: M,
+        _options: SendOptions,
+    ) -> core::result::Result<(), Error<M>> {
+        if self.inner.closed.load(Ordering::SeqCst) {
+            return Err(SendError::Closed(msg).into());
+        }
+
+        let mid = ID_COUNTER.fetch_add(1, Ordering::Relaxed);
+
+        if let Some(rs) = self.inner.lookup.get(&(msg.type_tag(), None, None)) {
+            if let Some((last, head)) = rs.split_last() {
+                for r in head {
+                    let _ = r.force_send(self, mid, msg.clone(), false);
+                }
+
+                let _ = last.force_send(self, mid, msg, false);
+
+                return Ok(());
+            }
+        }
+
+        warn!(
+            "Unhandled message {:?}: no receivers",
+            core::any::type_name::<M>()
+        );
+
+        Ok(())
+    }
+
+    #[inline]
+    pub fn try_send_one<M: Message>(&self, msg: M) -> Result<(), Error<M>> {
+        if self.inner.closed.load(Ordering::SeqCst) {
+            return Err(SendError::Closed(msg).into());
+        }
+
+        let tt = msg.type_tag();
+        let mid = ID_COUNTER.fetch_add(1, Ordering::Relaxed);
+
+        if let Some(rs) = self
+            .inner
+            .lookup
+            .get(&(msg.type_tag(), None, None))
+            .and_then(|rs| rs.first())
+        {
+            let permits = if let Some(x) = rs.try_reserve(&tt) {
+                x
+            } else {
+                return Err(SendError::Full(msg).into());
+            };
+
+            Ok(rs.send(self, mid, msg, false, permits)?)
+        } else {
+            Err(Error::NoReceivers)
+        }
+    }
+
+    pub async fn send_one<M: Message>(&self, msg: M) -> Result<(), Error<M>> {
+        if self.inner.closed.load(Ordering::SeqCst) {
+            return Err(SendError::Closed(msg).into());
+        }
+
+        let tt = msg.type_tag();
+        let mid = ID_COUNTER.fetch_add(1, Ordering::Relaxed);
+
+        if let Some(rs) = self
+            .inner
+            .lookup
+            .get(&(msg.type_tag(), None, None))
+            .and_then(|rs| rs.first())
+        {
+            Ok(rs.send(self, mid, msg, false, rs.reserve(&tt).await)?)
+        } else {
+            Err(Error::NoReceivers)
+        }
+    }
+
+    #[inline]
+    pub fn send_one_blocking<M: Message>(&self, msg: M) -> Result<(), Error<M>> {
+        futures::executor::block_on(self.send_one(msg))
+    }
+
+    pub async fn request<M: Message, R: Message>(
+        &self,
+        req: M,
+        options: SendOptions,
+    ) -> Result<R, Error<M>> {
+        let tid = M::type_tag_();
+        let rid = R::type_tag_();
+
+        let mut iter = self.select_receivers(tid.clone(), options, Some(rid), None, true);
+        if let Some(rc) = iter.next() {
+            let (mid, rx) = rc
+                .add_response_waiter::<R>()
+                .map_err(|x| x.specify::<M>())?;
+
+            let mid = mid | 1 << (u64::BITS - 1);
+
+            rc.send(self, mid, req, true, rc.reserve(&tid).await)?;
+            rx.await.map_err(|x| x.specify::<M>())
+        } else {
+            Err(Error::NoReceivers)
+        }
+    }
+
+    pub async fn request_we<M, R, E>(&self, req: M, options: SendOptions) -> Result<R, Error<M, E>>
+    where
+        M: Message,
+        R: Message,
+        E: StdSyncSendError,
+    {
+        let tid = M::type_tag_();
+        let rid = R::type_tag_();
+        let eid = E::type_tag_();
+
+        let mut iter = self.select_receivers(tid.clone(), options, Some(rid), Some(eid), true);
+        if let Some(rc) = iter.next() {
+            let (mid, rx) = rc.add_response_waiter_we::<R, E>().map_err(|x| {
+                x.map_err(|_| unimplemented!())
+                    .map_msg(|_| unimplemented!())
+            })?;
+
+            rc.send(
+                self,
+                mid | 1 << (u64::BITS - 1),
+                req,
+                true,
+                rc.reserve(&tid).await,
+            )
+            .map_err(|x| x.map_err(|_| unimplemented!()))?;
+
+            rx.await.map_err(|x| x.specify::<M>())
+        } else {
+            Err(Error::NoReceivers)
+        }
+    }
+
+    pub async fn send_boxed(
+        &self,
+        msg: Box<dyn Message>,
+        options: SendOptions,
+    ) -> Result<(), Error<Box<dyn Message>>> {
+        if self.inner.closed.load(Ordering::SeqCst) {
+            return Err(SendError::Closed(msg).into());
+        }
+
+        let tt = msg.type_tag();
+        let mid = ID_COUNTER.fetch_add(1, Ordering::Relaxed);
+
+        let mut iter = self.select_receivers(tt.clone(), options, None, None, false);
+        let first = iter.next();
+
+        for r in iter {
+            let _ = r.send_boxed(
+                self,
+                mid,
+                msg.try_clone_boxed().unwrap(),
+                false,
+                r.reserve(&tt).await,
+            );
+        }
+
+        if let Some(r) = first {
+            let _ = r.send_boxed(
+                self,
+                mid,
+                msg.try_clone_boxed().unwrap(),
+                false,
+                r.reserve(&tt).await,
+            );
+        } else {
+            warn!("Unhandled message: no receivers");
+        }
+
+        Ok(())
+    }
+
+    pub async fn send_boxed_one(
+        &self,
+        msg: Box<dyn Message>,
+        options: SendOptions,
+    ) -> Result<(), Error<Box<dyn Message>>> {
+        if self.inner.closed.load(Ordering::SeqCst) {
+            return Err(SendError::Closed(msg).into());
+        }
+
+        let tt = msg.type_tag();
+        let mid = ID_COUNTER.fetch_add(1, Ordering::Relaxed);
+
+        let mut iter = self.select_receivers(tt.clone(), options, None, None, false);
+        if let Some(rs) = iter.next() {
+            Ok(rs.send_boxed(self, mid, msg, false, rs.reserve(&tt).await)?)
+        } else {
+            Err(Error::NoReceivers)
+        }
+    }
+
+    pub async fn request_boxed(
+        &self,
+        req: Box<dyn Message>,
+        options: SendOptions,
+    ) -> Result<Box<dyn Message>, Error<Box<dyn Message>>> {
+        if self.inner.closed.load(Ordering::SeqCst) {
+            return Err(SendError::Closed(req).into());
+        }
+
+        let tt = req.type_tag();
+
+        let mut iter = self.select_receivers(tt.clone(), options, None, None, true);
+        if let Some(rc) = iter.next() {
+            let (mid, rx) = rc.add_response_waiter_boxed().map_err(|x| {
+                x.map_err(|_| unimplemented!())
+                    .map_msg(|_| unimplemented!())
+            })?;
+
+            rc.send_boxed(
+                self,
+                mid | 1 << (usize::BITS - 1),
+                req,
+                true,
+                rc.reserve(&tt).await,
+            )?;
+
+            rx.await.map_err(|x| x.specify::<Box<dyn Message>>())
+        } else {
+            Err(Error::NoReceivers)
+        }
+    }
+
+    pub async fn request_boxed_we<E: StdSyncSendError>(
+        &self,
+        req: Box<dyn Message>,
+        options: SendOptions,
+    ) -> Result<Box<dyn Message>, Error<Box<dyn Message>, E>> {
+        if self.inner.closed.load(Ordering::SeqCst) {
+            return Err(SendError::Closed(req).into());
+        }
+
+        let tt = req.type_tag();
+        let eid = E::type_tag_();
+
+        let mut iter = self.select_receivers(tt.clone(), options, None, Some(eid), true);
+        if let Some(rc) = iter.next() {
+            let (mid, rx) = rc.add_response_waiter_boxed_we().map_err(|x| {
+                x.map_err(|_| unimplemented!())
+                    .map_msg(|_| unimplemented!())
+            })?;
+
+            rc.send_boxed(
+                self,
+                mid | 1 << (usize::BITS - 1),
+                req,
+                true,
+                rc.reserve(&tt).await,
+            )
+            .map_err(|x| x.map_err(|_| unimplemented!()))?;
+
+            rx.await.map_err(|x| x.specify::<Box<dyn Message>>())
+        } else {
+            Err(Error::NoReceivers)
+        }
+    }
+
+    pub async fn send_deserialize_one<'a, 'b: 'a, 'c: 'a>(
+        &'a self,
+        tt: TypeTag,
+        de: &'b mut dyn erased_serde::Deserializer<'c>,
+        _options: SendOptions,
+    ) -> Result<(), Error<Box<dyn Message>>> {
+        if self.inner.closed.load(Ordering::SeqCst) {
+            warn!("closed message bus");
+            return Err(Error::NoResponse);
+        }
+
+        let mid = ID_COUNTER.fetch_add(1, Ordering::Relaxed);
+
+        if let Some(rs) = self
+            .inner
+            .lookup
+            .get(&(tt.clone(), None, None))
+            .and_then(|rs| rs.first())
+        {
+            let msg = deserialize_shared_message(tt.clone(), de)?;
+
+            Ok(rs.send_boxed(self, mid, msg.upcast_box(), false, rs.reserve(&tt).await)?)
+        } else {
+            Err(Error::NoReceivers)
+        }
+    }
+
+    pub async fn request_deserialize<'a, 'b: 'a, 'c: 'a>(
+        &'a self,
+        tt: TypeTag,
+        de: &'b mut dyn erased_serde::Deserializer<'c>,
+        options: SendOptions,
+    ) -> Result<Box<dyn Message>, Error<Box<dyn Message>>> {
+        if self.inner.closed.load(Ordering::SeqCst) {
+            warn!("closed message bus");
+            return Err(Error::NoResponse);
+        }
+
+        let mut iter = self.select_receivers(tt.clone(), options, None, None, true);
+        if let Some(rc) = iter.next() {
+            let (mid, rx) = rc.add_response_waiter_boxed().unwrap();
+            let msg = deserialize_shared_message(tt.clone(), de)?;
+
+            rc.send_boxed(
+                self,
+                mid | 1 << (usize::BITS - 1),
+                msg.upcast_box(),
+                true,
+                rc.reserve(&tt).await,
+            )?;
+
+            rx.await.map_err(|x| x.specify::<Box<dyn Message>>())
+        } else {
+            Err(Error::NoReceivers)
+        }
+    }
+
+    pub fn stats(&self) -> impl Iterator<Item = Stats> + '_ {
+        self.inner.receivers.iter().map(|x| x.stats())
+    }
+
+    #[inline]
+    fn select_receivers(
+        &self,
+        tid: TypeTag,
+        options: SendOptions,
+        rid: Option<TypeTag>,
+        eid: Option<TypeTag>,
+        is_req: bool,
+    ) -> impl Iterator<Item = &Receiver> + '_ {
+        self.inner
+            .lookup
+            .get(&(tid.clone(), rid.clone(), eid.clone()))
+            .into_iter()
+            .flatten()
+            .filter(move |r| r.accept(is_req, &tid, rid.as_ref(), eid.as_ref()))
+            .filter(move |r| match options {
+                SendOptions::Except(id) => id != r.id(),
+                SendOptions::Direct(id) => id == r.id(),
+                _ => true,
+            })
+    }
 }

src/msgs.rs

@@ -1,10 +0,0 @@
-use std::sync::Arc;
-
-#[derive(Clone, Debug)]
-pub struct Error(pub Arc<anyhow::Error>);
-
-impl<T: Into<anyhow::Error>> From<T> for Error {
-    fn from(e: T) -> Self {
-        Self(Arc::new(e.into()))
-    }
-}

src/receivers/buffer_unordered/async.rs

@@ -1,48 +1,65 @@
 use std::{
-    any::TypeId,
-    marker::PhantomData,
     pin::Pin,
     sync::{
         atomic::{AtomicU64, Ordering},
         Arc,
     },
-    task::{Context, Poll},
 };
 
-use crate::{receiver::ReceiverStats, receivers::mpsc};
-use futures::{Future, StreamExt};
-
-use super::{BufferUnorderedConfig, BufferUnorderedStats};
 use crate::{
-    builder::{ReceiverSubscriber, ReceiverSubscriberBuilder},
-    msgs,
-    receiver::{AnyReceiver, ReceiverTrait, SendError, TypedReceiver},
+    buffer_unordered_poller_macro,
+    builder::ReceiverSubscriberBuilder,
+    error::{Error, StdSyncSendError},
+    receiver::{
+        Action, Event, ReciveTypedReceiver, SendTypedReceiver, SendUntypedReceiver,
+        UntypedPollerCallback,
+    },
+    receivers::Request,
     AsyncHandler, Bus, Message, Untyped,
 };
 
-pub struct BufferUnorderedAsyncSubscriber<T, M>
+use super::{BufferUnorderedConfig, BufferUnorderedStats};
+
+use futures::{Future, Stream};
+use parking_lot::Mutex;
+use tokio::sync::mpsc::{self, UnboundedSender};
+
+buffer_unordered_poller_macro!(
+    T,
+    AsyncHandler,
+    |mid, msg, bus, ut: Arc<T>, stx: UnboundedSender<_>, task_permit| {
+        tokio::spawn(async move {
+            let resp = ut.handle(msg, &bus).await;
+            drop(task_permit);
+
+            stx.send(Event::Response(mid, resp.map_err(Error::Other)))
+                .unwrap();
+        })
+    },
+    |bus, ut: Arc<T>| { async move { ut.sync(&bus).await } }
+);
+
+pub struct BufferUnorderedAsync<M, R, E>
 where
-    T: AsyncHandler<M> + 'static,
     M: Message,
+    R: Message,
+    E: StdSyncSendError,
 {
-    cfg: BufferUnorderedConfig,
-    _m: PhantomData<(T, M)>,
+    tx: mpsc::UnboundedSender<Request<M>>,
+    stats: Arc<BufferUnorderedStats>,
+    srx: Mutex<Option<mpsc::UnboundedReceiver<Event<R, E>>>>,
 }
 
-impl<T, M> ReceiverSubscriber<T> for BufferUnorderedAsyncSubscriber<T, M>
+impl<T, M, R, E> ReceiverSubscriberBuilder<T, M, R, E> for BufferUnorderedAsync<M, R, E>
 where
-    T: AsyncHandler<M> + 'static,
+    T: AsyncHandler<M, Response = R, Error = E> + 'static,
+    R: Message,
     M: Message,
+    E: StdSyncSendError,
 {
-    fn subscribe(
-        self,
-    ) -> (
-        Arc<dyn ReceiverTrait>,
-        Box<
-            dyn FnOnce(Untyped) -> Box<dyn FnOnce(Bus) -> Pin<Box<dyn Future<Output = ()> + Send>>>,
-        >,
-    ) {
-        let cfg = self.cfg;
+    type Config = BufferUnorderedConfig;
+
+    fn build(cfg: Self::Config) -> (Self, UntypedPollerCallback) {
         let stats = Arc::new(BufferUnorderedStats {
             buffer: AtomicU64::new(0),
             buffer_total: AtomicU64::new(cfg.buffer_size as _),
@@ -50,154 +67,81 @@ where
             parallel_total: AtomicU64::new(cfg.max_parallel as _),
         });
 
-        let (tx, rx) = mpsc::channel(cfg.buffer_size);
-        let arc = Arc::new(BufferUnorderedAsync::<M> {
-            tx,
-            stats: stats.clone(),
-        });
+        let (stx, srx) = mpsc::unbounded_channel();
+        let (tx, rx) = mpsc::unbounded_channel();
+        let stats_clone = stats.clone();
 
         let poller = Box::new(move |ut| {
             Box::new(move |bus| {
-                Box::pin(buffer_unordered_poller::<T, M>(rx, bus, ut, stats, cfg))
-                    as Pin<Box<dyn Future<Output = ()> + Send>>
+                Box::pin(buffer_unordered_poller::<T, M, R, E>(
+                    rx,
+                    bus,
+                    ut,
+                    stats_clone,
+                    cfg,
+                    stx,
+                )) as Pin<Box<dyn Future<Output = ()> + Send>>
             }) as Box<dyn FnOnce(Bus) -> Pin<Box<dyn Future<Output = ()> + Send>>>
         });
 
-        (arc, poller)
+        (
+            BufferUnorderedAsync::<M, R, E> {
+                tx,
+                stats,
+                srx: Mutex::new(Some(srx)),
+            },
+            poller,
+        )
     }
 }
 
-async fn buffer_unordered_poller<T, M>(
-    rx: mpsc::Receiver<M>,
-    bus: Bus,
-    ut: Untyped,
-    stats: Arc<BufferUnorderedStats>,
-    cfg: BufferUnorderedConfig,
-) where
-    T: AsyncHandler<M> + 'static,
-    M: Message,
-{
-    let ut = ut.downcast::<T>().unwrap();
-
-    let mut x = rx
-        .map(|msg| {
-            stats.buffer.fetch_sub(1, Ordering::Relaxed);
-            stats.parallel.fetch_add(1, Ordering::Relaxed);
-            let bus = bus.clone();
-            let ut = ut.clone();
-
-            tokio::task::spawn(async move { ut.handle(msg, &bus).await })
-        })
-        .buffer_unordered(cfg.max_parallel);
-
-    while let Some(err) = x.next().await {
-        stats.parallel.fetch_sub(1, Ordering::Relaxed);
-
-        match err {
-            Ok(Err(err)) => {
-                let _ = bus.send(msgs::Error(Arc::new(err))).await;
-            }
-            _ => (),
-        }
-    }
-
-    let ut = ut.clone();
-    let bus_clone = bus.clone();
-    let res = tokio::task::spawn(async move { ut.sync(&bus_clone).await }).await;
-
-    match res {
-        Ok(Err(err)) => {
-            let _ = bus.send(msgs::Error(Arc::new(err))).await;
-        }
-        _ => (),
-    }
-
-    println!(
-        "[EXIT] BufferUnorderedAsync<{}>",
-        std::any::type_name::<M>()
-    );
-}
-
-pub struct BufferUnorderedAsync<M: Message> {
-    tx: mpsc::Sender<M>,
-    stats: Arc<BufferUnorderedStats>,
-}
-
-impl<T, M> ReceiverSubscriberBuilder<M, T> for BufferUnorderedAsync<M>
+impl<M, R, E> SendUntypedReceiver for BufferUnorderedAsync<M, R, E>
 where
-    T: AsyncHandler<M> + 'static,
     M: Message,
+    R: Message,
+    E: StdSyncSendError,
 {
-    type Entry = BufferUnorderedAsyncSubscriber<T, M>;
-    type Config = BufferUnorderedConfig;
-
-    fn build(cfg: Self::Config) -> Self::Entry {
-        BufferUnorderedAsyncSubscriber {
-            cfg,
-            _m: Default::default(),
+    fn send(&self, m: Action, _bus: &Bus) -> Result<(), Error<Action>> {
+        match self.tx.send(Request::Action(m)) {
+            Ok(_) => Ok(()),
+            Err(mpsc::error::SendError(Request::Action(msg))) => Err(Error::send_closed(msg)),
+            _ => unimplemented!(),
         }
     }
 }
 
-impl<M: Message> TypedReceiver<M> for BufferUnorderedAsync<M> {
-    fn poll_ready(&self, ctx: &mut Context<'_>) -> Poll<()> {
-        match self.tx.poll_ready(ctx) {
-            Poll::Ready(_) => Poll::Ready(()),
-            Poll::Pending => Poll::Pending,
-        }
-    }
-
-    fn try_send(&self, m: M) -> Result<(), SendError<M>> {
-        match self.tx.try_send(m) {
+impl<M, R, E> SendTypedReceiver<M> for BufferUnorderedAsync<M, R, E>
+where
+    M: Message,
+    R: Message,
+    E: StdSyncSendError,
+{
+    fn send(&self, mid: u64, m: M, req: bool, _bus: &Bus) -> Result<(), Error<M>> {
+        match self.tx.send(Request::Request(mid, m, req)) {
             Ok(_) => {
                 self.stats.buffer.fetch_add(1, Ordering::Relaxed);
 
                 Ok(())
             }
-            Err(err) => Err(err),
+            Err(mpsc::error::SendError(Request::Request(_, msg, _))) => {
+                Err(Error::send_closed(msg))
+            }
+            _ => unimplemented!(),
         }
     }
 }
 
-impl<M: Message> ReceiverTrait for BufferUnorderedAsync<M> {
-    fn typed(&self) -> AnyReceiver<'_> {
-        AnyReceiver::new(self)
-    }
+impl<M, R, E> ReciveTypedReceiver<R, E> for BufferUnorderedAsync<M, R, E>
+where
+    M: Message,
+    R: Message,
+    E: StdSyncSendError,
+{
+    type Stream = Pin<Box<dyn Stream<Item = Event<R, E>> + Send>>;
 
-    fn type_id(&self) -> TypeId {
-        TypeId::of::<BufferUnorderedAsync<M>>()
-    }
+    fn event_stream(&self, _: Bus) -> Self::Stream {
+        let mut rx = self.srx.lock().take().unwrap();
 
-    fn close(&self) {
-        self.tx.close();
-    }
-
-    fn stats(&self) -> ReceiverStats {
-        ReceiverStats {
-            name: std::any::type_name::<M>().into(),
-            fields: vec![
-                ("buffer".into(), self.stats.buffer.load(Ordering::SeqCst)),
-                (
-                    "buffer_total".into(),
-                    self.stats.buffer_total.load(Ordering::SeqCst),
-                ),
-                (
-                    "parallel".into(),
-                    self.stats.parallel.load(Ordering::SeqCst),
-                ),
-                (
-                    "parallel_total".into(),
-                    self.stats.parallel_total.load(Ordering::SeqCst),
-                ),
-            ],
-        }
-    }
-
-    fn sync(&self) {
-        self.tx.flush();
-    }
-
-    fn poll_synchronized(&self, _ctx: &mut Context<'_>) -> Poll<()> {
-        Poll::Ready(())
+        Box::pin(futures::stream::poll_fn(move |cx| rx.poll_recv(cx)))
     }
 }

src/receivers/buffer_unordered/mod.rs

@@ -3,8 +3,9 @@ mod sync;
 
 use std::sync::atomic::AtomicU64;
 
-pub use r#async::{BufferUnorderedAsync, BufferUnorderedAsyncSubscriber};
-pub use sync::{BufferUnorderedSync, BufferUnorderedSyncSubscriber};
+pub use r#async::BufferUnorderedAsync;
+use serde_derive::{Deserialize, Serialize};
+pub use sync::BufferUnorderedSync;
 
 #[derive(Debug)]
 pub struct BufferUnorderedStats {
@@ -14,7 +15,7 @@ pub struct BufferUnorderedStats {
     pub parallel_total: AtomicU64,
 }
 
-#[derive(Copy, Clone, Debug)]
+#[derive(Copy, Clone, Debug, Serialize, Deserialize)]
 pub struct BufferUnorderedConfig {
     pub buffer_size: usize,
     pub max_parallel: usize,
@@ -28,3 +29,62 @@ impl Default for BufferUnorderedConfig {
         }
     }
 }
+
+#[macro_export]
+macro_rules! buffer_unordered_poller_macro {
+    ($t: tt, $h: tt, $st1: expr, $st2: expr) => {
+        async fn buffer_unordered_poller<$t, M, R, E>(
+            mut rx: mpsc::UnboundedReceiver<Request<M>>,
+            bus: Bus,
+            ut: Untyped,
+            _stats: Arc<BufferUnorderedStats>,
+            cfg: BufferUnorderedConfig,
+            stx: mpsc::UnboundedSender<Event<R, E>>,
+        ) where
+            $t: $h<M, Response = R, Error = E> + 'static,
+            M: Message,
+            R: Message,
+            E: StdSyncSendError,
+        {
+            let ut = ut.downcast::<$t>().unwrap();
+            let semaphore = Arc::new(tokio::sync::Semaphore::new(cfg.max_parallel));
+
+            while let Some(msg) = rx.recv().await {
+                match msg {
+                    Request::Request(mid, msg, _req) => {
+                        #[allow(clippy::redundant_closure_call)]
+                        let _ = ($st1)(
+                            mid,
+                            msg,
+                            bus.clone(),
+                            ut.clone(),
+                            stx.clone(),
+                            semaphore.clone().acquire_owned().await,
+                        );
+                    }
+
+                    Request::Action(Action::Init(..)) => stx.send(Event::Ready).unwrap(),
+                    Request::Action(Action::Close) => rx.close(),
+
+                    Request::Action(Action::Flush) => {
+                        let _ = semaphore.acquire_many(cfg.max_parallel as _).await;
+                        stx.send(Event::Flushed).unwrap();
+                    }
+
+                    Request::Action(Action::Sync) => {
+                        let lock = semaphore.acquire_many(cfg.max_parallel as _).await;
+
+                        #[allow(clippy::redundant_closure_call)]
+                        let resp = ($st2)(bus.clone(), ut.clone()).await;
+                        drop(lock);
+
+                        stx.send(Event::Synchronized(resp.map_err(Error::Other)))
+                            .unwrap();
+                    }
+
+                    _ => unimplemented!(),
+                }
+            }
+        }
+    };
+}

src/receivers/buffer_unordered/sync.rs

@@ -1,48 +1,68 @@
-use crate::{receiver::ReceiverStats, receivers::mpsc};
-use futures::{Future, StreamExt};
 use std::{
-    any::TypeId,
-    marker::PhantomData,
     pin::Pin,
     sync::{
         atomic::{AtomicU64, Ordering},
         Arc,
     },
-    task::{Context, Poll},
 };
 
 use super::{BufferUnorderedConfig, BufferUnorderedStats};
 use crate::{
-    builder::{ReceiverSubscriber, ReceiverSubscriberBuilder},
-    msgs,
-    receiver::{AnyReceiver, ReceiverTrait, SendError, TypedReceiver},
+    buffer_unordered_poller_macro,
+    builder::ReceiverSubscriberBuilder,
+    error::{Error, StdSyncSendError},
+    receiver::{
+        Action, Event, ReciveTypedReceiver, SendTypedReceiver, SendUntypedReceiver,
+        UntypedPollerCallback,
+    },
+    receivers::Request,
     Bus, Handler, Message, Untyped,
 };
 
-pub struct BufferUnorderedSyncSubscriber<T, M>
+use futures::{Future, Stream};
+use parking_lot::Mutex;
+use tokio::sync::mpsc::{self, UnboundedSender};
+
+buffer_unordered_poller_macro!(
+    T,
+    Handler,
+    |mid, msg, bus, ut: Arc<T>, stx: UnboundedSender<_>, task_permit| {
+        tokio::task::spawn_blocking(move || {
+            let resp = ut.handle(msg, &bus);
+            drop(task_permit);
+
+            stx.send(Event::Response(mid, resp.map_err(Error::Other)))
+                .unwrap();
+        })
+    },
+    |bus, ut: Arc<T>| async move {
+        tokio::task::spawn_blocking(move || ut.sync(&bus))
+            .await
+            .unwrap()
+    }
+);
+
+pub struct BufferUnorderedSync<M, R, E>
 where
-    T: Handler<M> + 'static,
     M: Message,
+    R: Message,
+    E: StdSyncSendError,
 {
-    cfg: BufferUnorderedConfig,
-    _m: PhantomData<(M, T)>,
+    tx: mpsc::UnboundedSender<Request<M>>,
+    stats: Arc<BufferUnorderedStats>,
+    srx: Mutex<Option<mpsc::UnboundedReceiver<Event<R, E>>>>,
 }
 
-impl<T, M> ReceiverSubscriber<T> for BufferUnorderedSyncSubscriber<T, M>
+impl<T, M, R, E> ReceiverSubscriberBuilder<T, M, R, E> for BufferUnorderedSync<M, R, E>
 where
-    T: Handler<M> + 'static,
+    T: Handler<M, Response = R, Error = E> + 'static,
+    R: Message,
     M: Message,
+    E: StdSyncSendError,
 {
-    fn subscribe(
-        self,
-    ) -> (
-        Arc<dyn ReceiverTrait>,
-        Box<
-            dyn FnOnce(Untyped) -> Box<dyn FnOnce(Bus) -> Pin<Box<dyn Future<Output = ()> + Send>>>,
-        >,
-    ) {
-        let cfg = self.cfg;
-        let (tx, rx) = mpsc::channel(cfg.buffer_size);
+    type Config = BufferUnorderedConfig;
+
+    fn build(cfg: Self::Config) -> (Self, UntypedPollerCallback) {
         let stats = Arc::new(BufferUnorderedStats {
             buffer: AtomicU64::new(0),
             buffer_total: AtomicU64::new(cfg.buffer_size as _),
@@ -50,154 +70,81 @@ where
             parallel_total: AtomicU64::new(cfg.max_parallel as _),
         });
 
-        let arc = Arc::new(BufferUnorderedSync::<M> {
-            tx,
-            stats: stats.clone(),
-        });
+        let (stx, srx) = mpsc::unbounded_channel();
+        let (tx, rx) = mpsc::unbounded_channel();
+        let stats_clone = stats.clone();
 
         let poller = Box::new(move |ut| {
             Box::new(move |bus| {
-                Box::pin(buffer_unordered_poller::<T, M>(rx, bus, ut, stats, cfg))
-                    as Pin<Box<dyn Future<Output = ()> + Send>>
+                Box::pin(buffer_unordered_poller::<T, M, R, E>(
+                    rx,
+                    bus,
+                    ut,
+                    stats_clone,
+                    cfg,
+                    stx,
+                )) as Pin<Box<dyn Future<Output = ()> + Send>>
             }) as Box<dyn FnOnce(Bus) -> Pin<Box<dyn Future<Output = ()> + Send>>>
         });
 
-        (arc, poller)
+        (
+            BufferUnorderedSync::<M, R, E> {
+                tx,
+                stats,
+                srx: Mutex::new(Some(srx)),
+            },
+            poller,
+        )
     }
 }
 
-async fn buffer_unordered_poller<T, M>(
-    rx: mpsc::Receiver<M>,
-    bus: Bus,
-    ut: Untyped,
-    stats: Arc<BufferUnorderedStats>,
-    cfg: BufferUnorderedConfig,
-) where
-    T: Handler<M> + 'static,
-    M: Message,
-{
-    let ut = ut.downcast::<T>().unwrap();
-
-    let mut x = rx
-        .map(|msg| {
-            stats.buffer.fetch_sub(1, Ordering::Relaxed);
-            stats.parallel.fetch_add(1, Ordering::Relaxed);
-
-            let bus = bus.clone();
-            let ut = ut.clone();
-
-            tokio::task::spawn_blocking(move || ut.handle(msg, &bus))
-        })
-        .buffer_unordered(cfg.max_parallel);
-
-    while let Some(err) = x.next().await {
-        stats.parallel.fetch_sub(1, Ordering::Relaxed);
-
-        match err {
-            Ok(Err(err)) => {
-                let _ = bus.send(msgs::Error(Arc::new(err))).await;
-            }
-            _ => (),
-        }
-    }
-
-    let ut = ut.clone();
-    let bus_clone = bus.clone();
-    let res = tokio::task::spawn_blocking(move || ut.sync(&bus_clone)).await;
-
-    match res {
-        Ok(Err(err)) => {
-            let _ = bus.send(msgs::Error(Arc::new(err))).await;
-        }
-        _ => (),
-    }
-
-    println!(
-        "[EXIT] BufferUnorderedSync<{}>",
-        std::any::type_name::<M>()
-    );
-}
-
-pub struct BufferUnorderedSync<M: Message> {
-    tx: mpsc::Sender<M>,
-    stats: Arc<BufferUnorderedStats>,
-}
-
-impl<T, M> ReceiverSubscriberBuilder<M, T> for BufferUnorderedSync<M>
+impl<M, R, E> SendUntypedReceiver for BufferUnorderedSync<M, R, E>
 where
-    T: Handler<M> + 'static,
     M: Message,
+    R: Message,
+    E: StdSyncSendError,
 {
-    type Entry = BufferUnorderedSyncSubscriber<T, M>;
-    type Config = BufferUnorderedConfig;
-
-    fn build(cfg: Self::Config) -> Self::Entry {
-        BufferUnorderedSyncSubscriber {
-            cfg,
-            _m: Default::default(),
+    fn send(&self, msg: Action, _bus: &Bus) -> Result<(), Error<Action>> {
+        match self.tx.send(Request::Action(msg)) {
+            Ok(_) => Ok(()),
+            Err(mpsc::error::SendError(Request::Action(msg))) => Err(Error::send_closed(msg)),
+            _ => unimplemented!(),
         }
     }
 }
 
-impl<M: Message> TypedReceiver<M> for BufferUnorderedSync<M> {
-    fn poll_ready(&self, ctx: &mut Context<'_>) -> Poll<()> {
-        match self.tx.poll_ready(ctx) {
-            Poll::Ready(_) => Poll::Ready(()),
-            Poll::Pending => Poll::Pending,
-        }
-    }
-
-    fn try_send(&self, m: M) -> Result<(), SendError<M>> {
-        match self.tx.try_send(m) {
+impl<M, R, E> SendTypedReceiver<M> for BufferUnorderedSync<M, R, E>
+where
+    M: Message,
+    R: Message,
+    E: StdSyncSendError,
+{
+    fn send(&self, mid: u64, m: M, req: bool, _bus: &Bus) -> Result<(), Error<M>> {
+        match self.tx.send(Request::Request(mid, m, req)) {
             Ok(_) => {
                 self.stats.buffer.fetch_add(1, Ordering::Relaxed);
 
                 Ok(())
             }
-            Err(err) => Err(err),
+            Err(mpsc::error::SendError(Request::Request(_, msg, _))) => {
+                Err(Error::send_closed(msg))
+            }
+            _ => unimplemented!(),
         }
     }
 }
 
-impl<M: Message> ReceiverTrait for BufferUnorderedSync<M> {
-    fn typed(&self) -> AnyReceiver<'_> {
-        AnyReceiver::new(self)
-    }
+impl<M, R, E> ReciveTypedReceiver<R, E> for BufferUnorderedSync<M, R, E>
+where
+    M: Message,
+    R: Message,
+    E: StdSyncSendError,
+{
+    type Stream = Pin<Box<dyn Stream<Item = Event<R, E>> + Send>>;
 
-    fn type_id(&self) -> TypeId {
-        TypeId::of::<BufferUnorderedSync<M>>()
-    }
+    fn event_stream(&self, _: Bus) -> Self::Stream {
+        let mut rx = self.srx.lock().take().unwrap();
 
-    fn stats(&self) -> ReceiverStats {
-        ReceiverStats {
-            name: std::any::type_name::<M>().into(),
-            fields: vec![
-                ("buffer".into(), self.stats.buffer.load(Ordering::SeqCst)),
-                (
-                    "buffer_total".into(),
-                    self.stats.buffer_total.load(Ordering::SeqCst),
-                ),
-                (
-                    "parallel".into(),
-                    self.stats.parallel.load(Ordering::SeqCst),
-                ),
-                (
-                    "parallel_total".into(),
-                    self.stats.parallel_total.load(Ordering::SeqCst),
-                ),
-            ],
-        }
-    }
-
-    fn close(&self) {
-        self.tx.close();
-    }
-
-    fn sync(&self) {
-        self.tx.flush();
-    }
-
-    fn poll_synchronized(&self, _ctx: &mut Context<'_>) -> Poll<()> {
-        Poll::Ready(())
+        Box::pin(futures::stream::poll_fn(move |cx| rx.poll_recv(cx)))
     }
 }

src/receivers/buffer_unordered_batched/async.rs

@@ -1,48 +1,64 @@
 use std::{
-    any::TypeId,
-    marker::PhantomData,
     pin::Pin,
     sync::{
         atomic::{AtomicU64, Ordering},
         Arc,
     },
-    task::{Context, Poll},
 };
 
-use crate::{receiver::ReceiverStats, receivers::mpsc};
-use futures::{Future, StreamExt};
-
-use super::{BufferUnorderedBatchedConfig, BufferUnorderedBatchedStats};
 use crate::{
-    builder::{ReceiverSubscriber, ReceiverSubscriberBuilder},
-    msgs,
-    receiver::{AnyReceiver, ReceiverTrait, SendError, TypedReceiver},
+    buffer_unordered_batch_poller_macro,
+    builder::ReceiverSubscriberBuilder,
+    error::{Error, StdSyncSendError},
+    receiver::{
+        Action, Event, ReciveTypedReceiver, SendTypedReceiver, SendUntypedReceiver,
+        UntypedPollerCallback,
+    },
+    receivers::Request,
     AsyncBatchHandler, Bus, Message, Untyped,
 };
 
-pub struct BufferUnorderedBatchedAsyncSubscriber<T, M>
+use super::{BufferUnorderedBatchedConfig, BufferUnorderedBatchedStats};
+use futures::{Future, Stream};
+use parking_lot::Mutex;
+use tokio::sync::mpsc::{self, UnboundedSender};
+
+buffer_unordered_batch_poller_macro!(
+    T,
+    AsyncBatchHandler,
+    |mids: Vec<_>, msgs, bus, ut: Arc<T>, task_permit, stx: UnboundedSender<_>| {
+        tokio::spawn(async move {
+            let resp = ut.handle(msgs, &bus).await;
+            drop(task_permit);
+
+            crate::process_batch_result!(resp, mids, stx);
+        })
+    },
+    |bus, ut: Arc<T>| { async move { ut.sync(&bus).await } }
+);
+
+pub struct BufferUnorderedBatchedAsync<M, R, E>
 where
-    T: AsyncBatchHandler<M> + 'static,
     M: Message,
+    R: Message,
+    E: StdSyncSendError,
 {
-    cfg: BufferUnorderedBatchedConfig,
-    _m: PhantomData<(T, M)>,
+    tx: mpsc::UnboundedSender<Request<M>>,
+    stats: Arc<BufferUnorderedBatchedStats>,
+    srx: Mutex<Option<mpsc::UnboundedReceiver<Event<R, E>>>>,
 }
 
-impl<T, M> ReceiverSubscriber<T> for BufferUnorderedBatchedAsyncSubscriber<T, M>
+impl<T, M, R> ReceiverSubscriberBuilder<T, M, R, T::Error>
+    for BufferUnorderedBatchedAsync<M, R, T::Error>
 where
-    T: AsyncBatchHandler<M> + 'static,
+    T: AsyncBatchHandler<M, Response = R> + 'static,
+    T::Error: StdSyncSendError + Clone,
+    R: Message,
     M: Message,
 {
-    fn subscribe(
-        self,
-    ) -> (
-        Arc<dyn ReceiverTrait>,
-        Box<
-            dyn FnOnce(Untyped) -> Box<dyn FnOnce(Bus) -> Pin<Box<dyn Future<Output = ()> + Send>>>,
-        >,
-    ) {
-        let cfg = self.cfg;
+    type Config = BufferUnorderedBatchedConfig;
+
+    fn build(cfg: Self::Config) -> (Self, UntypedPollerCallback) {
         let stats = Arc::new(BufferUnorderedBatchedStats {
             buffer: AtomicU64::new(0),
             buffer_total: AtomicU64::new(cfg.buffer_size as _),
@@ -52,173 +68,81 @@ where
             batch_size: AtomicU64::new(cfg.batch_size as _),
         });
 
-        let (tx, rx) = mpsc::channel(cfg.buffer_size);
-        let arc = Arc::new(BufferUnorderedBatchedAsync::<M> {
-            tx,
-            stats: stats.clone(),
-        });
+        let (stx, srx) = mpsc::unbounded_channel();
+        let (tx, rx) = mpsc::unbounded_channel();
+        let stats_clone = stats.clone();
 
         let poller = Box::new(move |ut| {
             Box::new(move |bus| {
-                Box::pin(buffer_unordered_poller::<T, M>(rx, bus, ut, stats, cfg))
-                    as Pin<Box<dyn Future<Output = ()> + Send>>
+                Box::pin(buffer_unordered_batch_poller::<T, M, R>(
+                    rx,
+                    bus,
+                    ut,
+                    stats_clone,
+                    cfg,
+                    stx,
+                )) as Pin<Box<dyn Future<Output = ()> + Send>>
             }) as Box<dyn FnOnce(Bus) -> Pin<Box<dyn Future<Output = ()> + Send>>>
         });
 
-        (arc, poller)
+        (
+            BufferUnorderedBatchedAsync::<M, R, T::Error> {
+                tx,
+                stats,
+                srx: Mutex::new(Some(srx)),
+            },
+            poller,
+        )
     }
 }
 
-async fn buffer_unordered_poller<T, M>(
-    rx: mpsc::Receiver<M>,
-    bus: Bus,
-    ut: Untyped,
-    stats: Arc<BufferUnorderedBatchedStats>,
-    cfg: BufferUnorderedBatchedConfig,
-) where
-    T: AsyncBatchHandler<M> + 'static,
-    M: Message,
-{
-    let ut = ut.downcast::<T>().unwrap();
-    let rx = rx
-        .inspect(|_| {
-            stats.buffer.fetch_sub(1, Ordering::Relaxed);
-            stats.batch.fetch_add(1, Ordering::Relaxed); 
-        });
-
-    let rx = if cfg.when_ready {
-        rx.ready_chunks(cfg.batch_size)
-            .left_stream()
-    } else {
-        rx.chunks(cfg.batch_size)
-            .right_stream()
-    };
-
-    let mut rx = rx
-        .map(|msgs| {
-            stats.batch.fetch_sub(msgs.len() as _, Ordering::Relaxed);
-            stats.parallel.fetch_add(1, Ordering::Relaxed);
-
-            let bus_clone = bus.clone();
-            let ut = ut.clone();
-
-            tokio::task::spawn(async move { ut.handle(msgs, &bus_clone).await })
-        })
-        .buffer_unordered(cfg.max_parallel);
-
-    while let Some(err) = rx.next().await {
-        stats.parallel.fetch_sub(1, Ordering::Relaxed);
-
-        match err {
-            Ok(Err(err)) => {
-                let _ = bus.send(msgs::Error(Arc::new(err))).await;
-            }
-            _ => (),
-        }
-    }
-
-    let ut = ut.clone();
-    let bus_clone = bus.clone();
-    let res = tokio::task::spawn(async move { ut.sync(&bus_clone).await }).await;
-
-    match res {
-        Ok(Err(err)) => {
-            let _ = bus.send(msgs::Error(Arc::new(err))).await;
-        }
-        _ => (),
-    }
-
-    println!(
-        "[EXIT] BufferUnorderedBatchedAsync<{}>",
-        std::any::type_name::<M>()
-    );
-}
-
-pub struct BufferUnorderedBatchedAsync<M: Message> {
-    tx: mpsc::Sender<M>,
-    stats: Arc<BufferUnorderedBatchedStats>,
-}
-
-impl<T, M> ReceiverSubscriberBuilder<M, T> for BufferUnorderedBatchedAsync<M>
+impl<M, R, E> SendUntypedReceiver for BufferUnorderedBatchedAsync<M, R, E>
 where
-    T: AsyncBatchHandler<M> + 'static,
     M: Message,
+    R: Message,
+    E: StdSyncSendError,
 {
-    type Entry = BufferUnorderedBatchedAsyncSubscriber<T, M>;
-    type Config = BufferUnorderedBatchedConfig;
-
-    fn build(cfg: Self::Config) -> Self::Entry {
-        BufferUnorderedBatchedAsyncSubscriber {
-            cfg,
-            _m: Default::default(),
+    fn send(&self, m: Action, _bus: &Bus) -> Result<(), Error<Action>> {
+        match self.tx.send(Request::Action(m)) {
+            Ok(_) => Ok(()),
+            Err(mpsc::error::SendError(Request::Action(msg))) => Err(Error::send_closed(msg)),
+            _ => unimplemented!(),
         }
     }
 }
 
-impl<M: Message> TypedReceiver<M> for BufferUnorderedBatchedAsync<M> {
-    fn poll_ready(&self, ctx: &mut Context<'_>) -> Poll<()> {
-        match self.tx.poll_ready(ctx) {
-            Poll::Ready(_) => Poll::Ready(()),
-            Poll::Pending => Poll::Pending,
-        }
-    }
-
-    fn try_send(&self, m: M) -> Result<(), SendError<M>> {
-        match self.tx.try_send(m) {
+impl<M, R, E> SendTypedReceiver<M> for BufferUnorderedBatchedAsync<M, R, E>
+where
+    M: Message,
+    R: Message,
+    E: StdSyncSendError,
+{
+    fn send(&self, mid: u64, m: M, req: bool, _bus: &Bus) -> Result<(), Error<M>> {
+        match self.tx.send(Request::Request(mid, m, req)) {
             Ok(_) => {
                 self.stats.buffer.fetch_add(1, Ordering::Relaxed);
 
                 Ok(())
             }
-            Err(err) => Err(err),
+            Err(mpsc::error::SendError(Request::Request(_, msg, _))) => {
+                Err(Error::send_closed(msg))
+            }
+            _ => unimplemented!(),
         }
     }
 }
 
-impl<M: Message> ReceiverTrait for BufferUnorderedBatchedAsync<M> {
-    fn typed(&self) -> AnyReceiver<'_> {
-        AnyReceiver::new(self)
-    }
+impl<M, R, E> ReciveTypedReceiver<R, E> for BufferUnorderedBatchedAsync<M, R, E>
+where
+    M: Message,
+    R: Message,
+    E: StdSyncSendError,
+{
+    type Stream = Pin<Box<dyn Stream<Item = Event<R, E>> + Send>>;
 
-    fn type_id(&self) -> TypeId {
-        TypeId::of::<BufferUnorderedBatchedAsync<M>>()
-    }
+    fn event_stream(&self, _: Bus) -> Self::Stream {
+        let mut rx = self.srx.lock().take().unwrap();
 
-    fn close(&self) {
-        self.tx.close();
-    }
-
-    fn stats(&self) -> ReceiverStats {
-        ReceiverStats {
-            name: std::any::type_name::<M>().into(),
-            fields: vec![
-                ("buffer".into(), self.stats.buffer.load(Ordering::SeqCst)),
-                (
-                    "buffer_total".into(),
-                    self.stats.buffer_total.load(Ordering::SeqCst),
-                ),
-                (
-                    "parallel".into(),
-                    self.stats.parallel.load(Ordering::SeqCst),
-                ),
-                (
-                    "parallel_total".into(),
-                    self.stats.parallel_total.load(Ordering::SeqCst),
-                ),
-                ("batch".into(), self.stats.batch.load(Ordering::SeqCst)),
-                (
-                    "batch_size".into(),
-                    self.stats.batch_size.load(Ordering::SeqCst),
-                ),
-            ],
-        }
-    }
-
-    fn sync(&self) {
-        self.tx.flush();
-    }
-
-    fn poll_synchronized(&self, _ctx: &mut Context<'_>) -> Poll<()> {
-        Poll::Ready(())
+        Box::pin(futures::stream::poll_fn(move |cx| rx.poll_recv(cx)))
     }
 }

src/receivers/buffer_unordered_batched/mod.rs

@@ -3,8 +3,9 @@ mod sync;
 
 use std::sync::atomic::AtomicU64;
 
-pub use r#async::{BufferUnorderedBatchedAsync, BufferUnorderedBatchedAsyncSubscriber};
-pub use sync::{BufferUnorderedBatchedSync, BufferUnorderedBatchedSyncSubscriber};
+pub use r#async::BufferUnorderedBatchedAsync;
+use serde_derive::{Deserialize, Serialize};
+pub use sync::BufferUnorderedBatchedSync;
 
 #[derive(Debug)]
 pub struct BufferUnorderedBatchedStats {
@@ -16,7 +17,7 @@ pub struct BufferUnorderedBatchedStats {
     pub batch_size: AtomicU64,
 }
 
-#[derive(Copy, Clone, Debug)]
+#[derive(Copy, Clone, Debug, Serialize, Deserialize)]
 pub struct BufferUnorderedBatchedConfig {
     pub buffer_size: usize,
     pub max_parallel: usize,
@@ -34,3 +35,87 @@ impl Default for BufferUnorderedBatchedConfig {
         }
     }
 }
+
+#[macro_export]
+macro_rules! buffer_unordered_batch_poller_macro {
+    ($t: tt, $h: tt, $st1: expr, $st2: expr) => {
+        async fn buffer_unordered_batch_poller<$t, M, R>(
+            mut rx: mpsc::UnboundedReceiver<Request<M>>,
+            bus: Bus,
+            ut: Untyped,
+            _stats: Arc<BufferUnorderedBatchedStats>,
+            cfg: BufferUnorderedBatchedConfig,
+            stx: mpsc::UnboundedSender<Event<R, $t::Error>>,
+        ) where
+            $t: $h<M, Response = R> + 'static,
+            M: Message,
+            R: Message,
+        {
+            let ut = ut.downcast::<$t>().unwrap();
+            let semaphore = Arc::new(tokio::sync::Semaphore::new(cfg.max_parallel));
+
+            let mut buffer_mid = Vec::with_capacity(cfg.batch_size);
+            let mut buffer = Vec::with_capacity(cfg.batch_size);
+
+            while let Some(msg) = rx.recv().await {
+                let bus = bus.clone();
+                let ut = ut.clone();
+                let semaphore = semaphore.clone();
+                let stx = stx.clone();
+
+                match msg {
+                    Request::Request(mid, msg, req) => {
+                        buffer_mid.push((mid, req));
+                        buffer.push(msg);
+
+                        if buffer_mid.len() >= cfg.batch_size {
+                            let task_permit = semaphore.acquire_owned().await;
+
+                            let buffer_mid_clone = buffer_mid.drain(..).collect::<Vec<_>>();
+                            let buffer_clone = buffer.drain(..).collect();
+
+                            #[allow(clippy::redundant_closure_call)]
+                            let _ =
+                                ($st1)(buffer_mid_clone, buffer_clone, bus, ut, task_permit, stx);
+                        }
+                    }
+                    Request::Action(Action::Init(..)) => {
+                        stx.send(Event::Ready).unwrap();
+                    }
+                    Request::Action(Action::Close) => {
+                        rx.close();
+                    }
+                    Request::Action(Action::Flush) => {
+                        let stx_clone = stx.clone();
+
+                        if !buffer_mid.is_empty() {
+                            let buffer_mid_clone = buffer_mid.drain(..).collect::<Vec<_>>();
+                            let buffer_clone = buffer.drain(..).collect();
+                            let task_permit = semaphore.clone().acquire_owned().await;
+
+                            #[allow(clippy::redundant_closure_call)]
+                            let _ =
+                                ($st1)(buffer_mid_clone, buffer_clone, bus, ut, task_permit, stx);
+                        }
+
+                        let _ = semaphore.acquire_many(cfg.max_parallel as _).await;
+                        stx_clone.send(Event::Flushed).unwrap();
+                    }
+
+                    Request::Action(Action::Sync) => {
+                        let lock = semaphore.acquire_many(cfg.max_parallel as _).await;
+
+                        #[allow(clippy::redundant_closure_call)]
+                        let resp = ($st2)(bus.clone(), ut.clone()).await;
+                        drop(lock);
+
+                        stx.send(Event::Synchronized(resp.map_err(Error::Other)))
+                            .unwrap();
+                    }
+
+                    _ => unimplemented!(),
+                }
+            }
+        }
+    };
+}

src/receivers/buffer_unordered_batched/sync.rs

@@ -1,48 +1,70 @@
-use crate::{receiver::ReceiverStats, receivers::mpsc};
-use futures::{Future, StreamExt};
 use std::{
-    any::TypeId,
-    marker::PhantomData,
     pin::Pin,
     sync::{
         atomic::{AtomicU64, Ordering},
         Arc,
     },
-    task::{Context, Poll},
 };
 
 use super::{BufferUnorderedBatchedConfig, BufferUnorderedBatchedStats};
 use crate::{
-    builder::{ReceiverSubscriber, ReceiverSubscriberBuilder},
-    msgs,
-    receiver::{AnyReceiver, ReceiverTrait, SendError, TypedReceiver},
-    Bus, BatchHandler, Message, Untyped,
+    buffer_unordered_batch_poller_macro,
+    builder::ReceiverSubscriberBuilder,
+    error::{Error, StdSyncSendError},
+    receiver::{
+        Action, Event, ReciveTypedReceiver, SendTypedReceiver, SendUntypedReceiver,
+        UntypedPollerCallback,
+    },
+    receivers::Request,
+    BatchHandler, Bus, Message, Untyped,
 };
 
-pub struct BufferUnorderedBatchedSyncSubscriber<T, M>
+use futures::{Future, Stream};
+use parking_lot::Mutex;
+use tokio::sync::mpsc::{self, UnboundedSender};
+
+buffer_unordered_batch_poller_macro!(
+    T,
+    BatchHandler,
+    |mids: Vec<_>, msgs, bus, ut: Arc<T>, task_permit, stx: UnboundedSender<_>| {
+        tokio::task::spawn_blocking(move || {
+            let resp = ut.handle(msgs, &bus);
+            drop(task_permit);
+
+            crate::process_batch_result!(resp, mids, stx);
+        })
+    },
+    |bus, ut: Arc<T>| {
+        async move {
+            tokio::task::spawn_blocking(move || ut.sync(&bus))
+                .await
+                .unwrap()
+        }
+    }
+);
+
+pub struct BufferUnorderedBatchedSync<M, R, E>
 where
-    T: BatchHandler<M> + 'static,
     M: Message,
+    R: Message,
+    E: StdSyncSendError,
 {
-    cfg: BufferUnorderedBatchedConfig,
-    _m: PhantomData<(M, T)>,
+    tx: mpsc::UnboundedSender<Request<M>>,
+    stats: Arc<BufferUnorderedBatchedStats>,
+    srx: Mutex<Option<mpsc::UnboundedReceiver<Event<R, E>>>>,
 }
 
-impl<T, M> ReceiverSubscriber<T> for BufferUnorderedBatchedSyncSubscriber<T, M>
+impl<T, M, R> ReceiverSubscriberBuilder<T, M, R, T::Error>
+    for BufferUnorderedBatchedSync<M, R, T::Error>
 where
-    T: BatchHandler<M> + 'static,
+    T: BatchHandler<M, Response = R> + 'static,
+    T::Error: StdSyncSendError,
+    R: Message,
     M: Message,
 {
-    fn subscribe(
-        self,
-    ) -> (
-        Arc<dyn ReceiverTrait>,
-        Box<
-            dyn FnOnce(Untyped) -> Box<dyn FnOnce(Bus) -> Pin<Box<dyn Future<Output = ()> + Send>>>,
-        >,
-    ) {
-        let cfg = self.cfg;
-        let (tx, rx) = mpsc::channel(cfg.buffer_size);
+    type Config = BufferUnorderedBatchedConfig;
+
+    fn build(cfg: Self::Config) -> (Self, UntypedPollerCallback) {
         let stats = Arc::new(BufferUnorderedBatchedStats {
             buffer: AtomicU64::new(0),
             buffer_total: AtomicU64::new(cfg.buffer_size as _),
@@ -52,172 +74,81 @@ where
             batch_size: AtomicU64::new(cfg.batch_size as _),
         });
 
-        let arc = Arc::new(BufferUnorderedBatchedSync::<M> {
-            tx,
-            stats: stats.clone(),
-        });
+        let (stx, srx) = mpsc::unbounded_channel();
+        let (tx, rx) = mpsc::unbounded_channel();
+        let stats_clone = stats.clone();
 
         let poller = Box::new(move |ut| {
             Box::new(move |bus| {
-                Box::pin(buffer_unordered_poller::<T, M>(rx, bus, ut, stats, cfg))
-                    as Pin<Box<dyn Future<Output = ()> + Send>>
+                Box::pin(buffer_unordered_batch_poller::<T, M, R>(
+                    rx,
+                    bus,
+                    ut,
+                    stats_clone,
+                    cfg,
+                    stx,
+                )) as Pin<Box<dyn Future<Output = ()> + Send>>
             }) as Box<dyn FnOnce(Bus) -> Pin<Box<dyn Future<Output = ()> + Send>>>
         });
 
-        (arc, poller)
+        (
+            BufferUnorderedBatchedSync::<M, R, T::Error> {
+                tx,
+                stats,
+                srx: Mutex::new(Some(srx)),
+            },
+            poller,
+        )
     }
 }
 
-async fn buffer_unordered_poller<T, M>(
-    rx: mpsc::Receiver<M>,
-    bus: Bus,
-    ut: Untyped,
-    stats: Arc<BufferUnorderedBatchedStats>,
-    cfg: BufferUnorderedBatchedConfig,
-) where
-    T: BatchHandler<M> + 'static,
-    M: Message,
-{
-    let ut = ut.downcast::<T>().unwrap();
-    let rx = rx
-        .inspect(|_| { 
-            stats.buffer.fetch_sub(1, Ordering::Relaxed);
-            stats.batch.fetch_add(1, Ordering::Relaxed); 
-        });
-
-    let rx = if cfg.when_ready {
-        rx.ready_chunks(cfg.batch_size)
-            .left_stream()
-    } else {
-        rx.chunks(cfg.batch_size)
-            .right_stream()
-    };
-
-    let mut rx = rx
-        .map(|msgs| {
-            stats.batch.fetch_sub(msgs.len() as _, Ordering::Relaxed);
-            stats.parallel.fetch_add(1, Ordering::Relaxed);
-
-            let bus = bus.clone();
-            let ut = ut.clone();
-
-            tokio::task::spawn_blocking(move || ut.handle(msgs, &bus))
-        })
-        .buffer_unordered(cfg.max_parallel);
-
-    while let Some(err) = rx.next().await {
-        stats.parallel.fetch_sub(1, Ordering::Relaxed);
-
-        match err {
-            Ok(Err(err)) => {
-                let _ = bus.send(msgs::Error(Arc::new(err))).await;
-            }
-            _ => (),
-        }
-    }
-
-    let ut = ut.clone();
-    let bus_clone = bus.clone();
-    let res = tokio::task::spawn_blocking(move || ut.sync(&bus_clone)).await;
-
-    match res {
-        Ok(Err(err)) => {
-            let _ = bus.send(msgs::Error(Arc::new(err))).await;
-        }
-        _ => (),
-    }
-
-    println!(
-        "[EXIT] BufferUnorderedBatchedSync<{}>",
-        std::any::type_name::<M>()
-    );
-}
-
-pub struct BufferUnorderedBatchedSync<M: Message> {
-    tx: mpsc::Sender<M>,
-    stats: Arc<BufferUnorderedBatchedStats>,
-}
-
-impl<T, M> ReceiverSubscriberBuilder<M, T> for BufferUnorderedBatchedSync<M>
+impl<M, R, E> SendUntypedReceiver for BufferUnorderedBatchedSync<M, R, E>
 where
-    T: BatchHandler<M> + 'static,
     M: Message,
+    R: Message,
+    E: StdSyncSendError,
 {
-    type Entry = BufferUnorderedBatchedSyncSubscriber<T, M>;
-    type Config = BufferUnorderedBatchedConfig;
-
-    fn build(cfg: Self::Config) -> Self::Entry {
-        BufferUnorderedBatchedSyncSubscriber {
-            cfg,
-            _m: Default::default(),
+    fn send(&self, msg: Action, _bus: &Bus) -> Result<(), Error<Action>> {
+        match self.tx.send(Request::Action(msg)) {
+            Ok(_) => Ok(()),
+            Err(mpsc::error::SendError(Request::Action(msg))) => Err(Error::send_closed(msg)),
+            _ => unimplemented!(),
         }
     }
 }
 
-impl<M: Message> TypedReceiver<M> for BufferUnorderedBatchedSync<M> {
-    fn poll_ready(&self, ctx: &mut Context<'_>) -> Poll<()> {
-        match self.tx.poll_ready(ctx) {
-            Poll::Ready(_) => Poll::Ready(()),
-            Poll::Pending => Poll::Pending,
-        }
-    }
-
-    fn try_send(&self, m: M) -> Result<(), SendError<M>> {
-        match self.tx.try_send(m) {
+impl<M, R, E> SendTypedReceiver<M> for BufferUnorderedBatchedSync<M, R, E>
+where
+    M: Message,
+    R: Message,
+    E: StdSyncSendError,
+{
+    fn send(&self, mid: u64, m: M, req: bool, _bus: &Bus) -> Result<(), Error<M>> {
+        match self.tx.send(Request::Request(mid, m, req)) {
             Ok(_) => {
                 self.stats.buffer.fetch_add(1, Ordering::Relaxed);
 
                 Ok(())
             }
-            Err(err) => Err(err),
+            Err(mpsc::error::SendError(Request::Request(_, msg, _))) => {
+                Err(Error::send_closed(msg))
+            }
+            _ => unimplemented!(),
         }
     }
 }
 
-impl<M: Message> ReceiverTrait for BufferUnorderedBatchedSync<M> {
-    fn typed(&self) -> AnyReceiver<'_> {
-        AnyReceiver::new(self)
-    }
+impl<M, R, E> ReciveTypedReceiver<R, E> for BufferUnorderedBatchedSync<M, R, E>
+where
+    M: Message,
+    R: Message,
+    E: StdSyncSendError,
+{
+    type Stream = Pin<Box<dyn Stream<Item = Event<R, E>> + Send>>;
 
-    fn type_id(&self) -> TypeId {
-        TypeId::of::<BufferUnorderedBatchedSync<M>>()
-    }
+    fn event_stream(&self, _: Bus) -> Self::Stream {
+        let mut rx = self.srx.lock().take().unwrap();
 
-    fn stats(&self) -> ReceiverStats {
-        ReceiverStats {
-            name: std::any::type_name::<M>().into(),
-            fields: vec![
-                ("buffer".into(), self.stats.buffer.load(Ordering::SeqCst)),
-                (
-                    "buffer_total".into(),
-                    self.stats.buffer_total.load(Ordering::SeqCst),
-                ),
-                (
-                    "parallel".into(),
-                    self.stats.parallel.load(Ordering::SeqCst),
-                ),
-                (
-                    "parallel_total".into(),
-                    self.stats.parallel_total.load(Ordering::SeqCst),
-                ),
-                ("batch".into(), self.stats.batch.load(Ordering::SeqCst)),
-                (
-                    "batch_size".into(),
-                    self.stats.batch_size.load(Ordering::SeqCst),
-                ),
-            ],
-        }
-    }
-
-    fn close(&self) {
-        self.tx.close();
-    }
-
-    fn sync(&self) {
-        self.tx.flush();
-    }
-
-    fn poll_synchronized(&self, _ctx: &mut Context<'_>) -> Poll<()> {
-        Poll::Ready(())
+        Box::pin(futures::stream::poll_fn(move |cx| rx.poll_recv(cx)))
     }
 }

src/receivers/mod.rs

@@ -1,29 +1,56 @@
 mod buffer_unordered;
 mod buffer_unordered_batched;
-mod mpsc_futures;
+// mod producer;
 mod synchronize_batched;
 mod synchronized;
 
-mod mpsc {
-    pub use super::mpsc_futures::*;
-}
-
-pub use buffer_unordered::{
-    BufferUnorderedAsync, BufferUnorderedAsyncSubscriber, BufferUnorderedConfig,
-    BufferUnorderedSync, BufferUnorderedSyncSubscriber,
-};
-
+pub use buffer_unordered::{BufferUnorderedAsync, BufferUnorderedConfig, BufferUnorderedSync};
 pub use buffer_unordered_batched::{
-    BufferUnorderedBatchedAsync, BufferUnorderedBatchedAsyncSubscriber, BufferUnorderedBatchedConfig,
-    BufferUnorderedBatchedSync, BufferUnorderedBatchedSyncSubscriber,
-};
-
-pub use synchronized::{
-    SynchronizedAsync, SynchronizedAsyncSubscriber, SynchronizedConfig, SynchronizedSync,
-    SynchronizedSyncSubscriber,
+    BufferUnorderedBatchedAsync, BufferUnorderedBatchedConfig, BufferUnorderedBatchedSync,
 };
+pub use synchronized::{SynchronizedAsync, SynchronizedConfig, SynchronizedSync};
 
 pub use synchronize_batched::{
-    SynchronizeBatchedAsync, SynchronizeBatchedAsyncSubscriber, SynchronizeBatchedConfig,
-    SynchronizeBatchedSync, SynchronizeBatchedSyncSubscriber,
+    SynchronizedBatchedAsync, SynchronizedBatchedConfig, SynchronizedBatchedSync,
 };
+
+// pub use producer::{AsyncProducer, AsyncProducerConfig};
+
+use crate::receiver::Action;
+
+#[macro_export]
+macro_rules! process_batch_result {
+    ($resp: expr, $mids: expr, $stx: expr) => {
+        let mids = $mids;
+
+        match $resp {
+            Ok(re) => {
+                let mut mids = mids.into_iter();
+                let mut re = re.into_iter();
+
+                while let Some((mid, _req)) = mids.next() {
+                    if let Some(r) = re.next() {
+                        $stx.send(Event::Response(mid, Ok(r))).unwrap();
+                    } else {
+                        $stx.send(Event::Response(mid, Err(Error::NoResponse)))
+                            .unwrap();
+                    }
+                }
+            }
+            Err(er) => {
+                for (mid, _req) in mids {
+                    $stx.send(Event::Response(mid, Err(Error::Other(er.clone()))))
+                        .unwrap();
+                }
+
+                $stx.send(Event::Error(Error::Other(er))).unwrap();
+            }
+        }
+    };
+}
+
+#[derive(Debug)]
+pub(crate) enum Request<M> {
+    Action(Action),
+    Request(u64, M, bool),
+}

src/receivers/mpsc.rs

@@ -1,142 +0,0 @@
-use futures::{Stream, StreamExt};
-use core::pin::Pin;
-use crossbeam::queue::ArrayQueue;
-use crossbeam::atomic::AtomicCell;
-use core::task::{Waker, Context, Poll};
-use std::sync::{Arc, atomic::*};
-
-use crate::receiver::SendError;
-
-
-
-struct ChannelInner<T> {
-    queue: ArrayQueue<T>,
-    send_waker: AtomicCell<Option<Box<Waker>>>,
-    recv_waker: AtomicCell<Option<Box<Waker>>>,
-    closed: AtomicBool,
-}
-
-pub fn channel<T>(buffer: usize) -> (Sender<T>, Receiver<T>) {
-    let inner = Arc::new(ChannelInner {
-        queue: ArrayQueue::new(buffer),
-        send_waker: AtomicCell::new(None),
-        recv_waker: AtomicCell::new(None),
-        closed: AtomicBool::new(false),
-    });
-    
-    (
-        Sender {
-            inner: inner.clone(),
-        },
-        Receiver {
-            inner,
-        }
-    )
-}
-
-
-#[derive(Clone)]
-pub struct Sender<T> {
-    inner: Arc<ChannelInner<T>>
-}
-
-impl <T> Sender<T> {
-    pub fn poll_ready(&self, cx: &mut Context<'_>) -> Poll<()> {
-        if self.inner.closed.load(Ordering::SeqCst) {
-            return Poll::Ready(());
-        }
-
-        if self.inner.queue.is_full() {
-            self.inner.send_waker.store(Some(Box::new(cx.waker().clone())));
-        }
-        
-        let mut counter = 4;
-        loop {
-            if self.inner.queue.is_full() {
-                if counter > 0 {
-                    counter -= 1;
-                    continue;
-                } else {
-                    break Poll::Pending;
-                }
-            } else {
-                break Poll::Ready(());
-            }
-        }
-    }
-    
-    pub fn try_send(&self, mut item: T) -> Result<(), SendError<T>> {
-        if self.inner.closed.load(Ordering::SeqCst) {
-            return Err(SendError::Closed(item));
-        }
-
-        let mut counter = 0;
-        loop {
-            match self.inner.queue.push(item) {
-                Ok(_) => {
-                    if let Some(waker) = self.inner.recv_waker.take() {
-                        waker.wake();
-                    }
-                    
-                    break Ok(());
-                }
-                
-                Err(inner) => {
-                    if counter >= 4 {
-                        break Err(SendError::Full(inner));
-                    } else {
-                        item = inner;
-                        counter += 1;
-                    }
-                }
-            }
-        }
-    }
-
-    pub fn close(&self) {
-        self.inner.closed.store(true, Ordering::SeqCst);
-        if let Some(waker) = self.inner.recv_waker.take() {
-            waker.wake();
-        }
-    }    
-}
-
-pub struct Receiver<T> {
-    inner: Arc<ChannelInner<T>>
-}
-
-impl <T> Stream for Receiver<T> {
-    type Item = T;
-    
-    fn poll_next(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
-        let this = self.get_mut();
-        let mut counter = 0;
-        
-        loop {
-            match this.inner.queue.pop() {
-                Some(inner) => {
-                    if let Some(waker) = this.inner.send_waker.take() {
-                        waker.wake();
-                    }
-                    
-                    break Poll::Ready(Some(inner));
-                },
-                None => {
-                    if this.inner.closed.load(Ordering::SeqCst) {
-                        break Poll::Ready(None);
-                    } else {
-                        if counter == 0 {
-                            this.inner.recv_waker.store(Some(Box::new(cx.waker().clone())));
-                        }
-                        
-                        if counter >= 8 {
-                            break Poll::Pending;
-                        } else {
-                            counter += 1;
-                        }
-                    }
-                }
-            }
-        }
-    }
-}

src/receivers/mpsc_futures.rs

@@ -1,105 +0,0 @@
-use crate::receiver::SendError;
-use core::pin::Pin;
-use core::task::{Context, Poll};
-use crossbeam::queue::SegQueue;
-use futures::{channel::mpsc, Stream};
-use std::{
-    sync::{
-        atomic::{AtomicUsize, Ordering},
-        Arc,
-    },
-    task::Waker,
-};
-
-pub struct State {
-    buffer: usize,
-    counter: AtomicUsize,
-    send_wakers: SegQueue<Waker>,
-}
-
-pub fn channel<T>(buffer: usize) -> (Sender<T>, Receiver<T>) {
-    let state = Arc::new(State {
-        buffer,
-        counter: AtomicUsize::new(0),
-        send_wakers: SegQueue::new(),
-    });
-    let (tx, rx) = mpsc::unbounded();
-
-    (
-        Sender {
-            inner: tx,
-            state: state.clone(),
-        },
-        Receiver { inner: rx, state },
-    )
-}
-
-pub struct Sender<T> {
-    inner: mpsc::UnboundedSender<T>,
-    state: Arc<State>,
-}
-
-impl<T> Sender<T> {
-    pub fn poll_ready(&self, cx: &mut Context<'_>) -> Poll<()> {
-        if self.state.counter.load(Ordering::SeqCst) >= self.state.buffer {
-            self.state.send_wakers.push(cx.waker().clone());
-            return Poll::Pending;
-        }
-
-        Poll::Ready(())
-    }
-
-    pub fn try_send(&self, item: T) -> Result<(), SendError<T>> {
-        if self.state.counter.load(Ordering::Relaxed) >= self.state.buffer {
-            return Err(SendError::Full(item));
-        }
-
-        self.state.counter.fetch_add(1, Ordering::SeqCst);
-        match self.inner.unbounded_send(item) {
-            Ok(_) => Ok(()),
-            Err(err) if err.is_full() => Err(SendError::Full(err.into_inner())),
-            Err(err) => Err(SendError::Closed(err.into_inner())),
-        }
-    }
-
-    #[inline]
-    pub fn flush(&self) {}
-
-    #[inline]
-    pub fn close(&self) {
-        self.inner.close_channel();
-    }
-}
-
-pub struct Receiver<T> {
-    inner: mpsc::UnboundedReceiver<T>,
-    state: Arc<State>,
-}
-
-impl<T> Stream for Receiver<T> {
-    type Item = T;
-
-    fn poll_next(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
-        let this = self.get_mut();
-        match Pin::new(&mut this.inner).poll_next(cx) {
-            Poll::Ready(inner) => {
-                let val = this.state.counter.fetch_sub(1, Ordering::SeqCst);
-
-                if val <= this.state.buffer {
-                    if let Some(waker) = this.state.send_wakers.pop() {
-                        waker.wake();
-                    }
-                }
-
-                Poll::Ready(inner)
-            }
-            Poll::Pending => {
-                while let Some(waker) = this.state.send_wakers.pop() {
-                    waker.wake();
-                }
-
-                Poll::Pending
-            },
-        }
-    }
-}

src/receivers/producer/mod.rs

@@ -0,0 +1,147 @@
+use std::pin::Pin;
+
+use futures::{pin_mut, Future, Stream};
+use tokio::sync::{mpsc, Mutex};
+
+use crate::builder::ReceiverSubscriberBuilder;
+use crate::error::{Error, StdSyncSendError};
+use crate::handler::AsyncProducer as AsyncProducerHandler;
+use crate::receiver::UntypedPollerCallback;
+use crate::receivers::Request;
+use crate::{
+    Action, Bus, Event, Message, ReciveTypedReceiver, SendTypedReceiver, SendUntypedReceiver,
+    Untyped,
+};
+
+#[derive(Default)]
+pub struct AsyncProducerConfig {}
+
+async fn producer_poller<T, M>(
+    mut rx: mpsc::UnboundedReceiver<Request<M>>,
+    bus: Bus,
+    ut: Untyped,
+    stx: mpsc::UnboundedSender<Event<T::Response, T::Error>>,
+) where
+    T: AsyncProducerHandler<M> + 'static,
+    T::Error: StdSyncSendError,
+    T::Item: Message,
+    T::Response: Message,
+    M: Message,
+{
+    let ut = ut.downcast::<Mutex<T>>().unwrap();
+    let stream = Option<Pin<Box<dyn Stream<Item = Result<Self::Item, Self::Error>> + Send + '_>>, Self::Error>;
+
+    while let Some(msg) = rx.recv().await {
+        match msg {
+            Request::Request(mid, msg, _req) => {
+                let lock = ut.lock().await;
+                let stream = lock.producer(msg, &bus).await.unwrap();
+                pin_mut!(stream);
+
+                stx.send(Event::BatchComplete(M::type_tag_(), 1)).unwrap();
+            }
+            Request::Action(Action::Init(..)) => {
+                stx.send(Event::Ready).unwrap();
+            }
+            Request::Action(Action::Close) => {
+                rx.close();
+            }
+            Request::Action(Action::Flush) => {
+                stx.send(Event::Flushed).unwrap();
+            }
+            Request::Action(Action::Sync) => {}
+
+            _ => unimplemented!(),
+        }
+    }
+}
+
+#[derive(Debug)]
+pub struct AsyncProducer<M, R, E>
+where
+    M: Message,
+    R: Message,
+    E: StdSyncSendError,
+{
+    tx: mpsc::UnboundedSender<Request<M>>,
+    srx: parking_lot::Mutex<Option<mpsc::UnboundedReceiver<Event<R, E>>>>,
+}
+
+impl<T, M> ReceiverSubscriberBuilder<T, M, T::Response, T::Error>
+    for AsyncProducer<M, T::Response, T::Error>
+where
+    T: AsyncProducerHandler<M> + 'static,
+    T::Item: Message,
+    T::Response: Message,
+    T::Error: StdSyncSendError,
+    M: Message,
+{
+    type Config = AsyncProducerConfig;
+
+    fn build(_cfg: Self::Config) -> (Self, UntypedPollerCallback) {
+        let (stx, srx) = mpsc::unbounded_channel();
+        let (tx, rx) = mpsc::unbounded_channel();
+
+        let poller = Box::new(move |ut| {
+            Box::new(move |bus| {
+                Box::pin(producer_poller::<T, M>(rx, bus, ut, stx))
+                    as Pin<Box<dyn Future<Output = ()> + Send>>
+            }) as Box<dyn FnOnce(Bus) -> Pin<Box<dyn Future<Output = ()> + Send>>>
+        });
+
+        (
+            AsyncProducer::<M, T::Response, T::Error> {
+                tx,
+                srx: parking_lot::Mutex::new(Some(srx)),
+            },
+            poller,
+        )
+    }
+}
+
+impl<M, R, E> SendUntypedReceiver for AsyncProducer<M, R, E>
+where
+    M: Message,
+    R: Message,
+    E: StdSyncSendError,
+{
+    fn send(&self, m: Action, _bus: &Bus) -> Result<(), Error<Action>> {
+        match self.tx.send(Request::Action(m)) {
+            Ok(_) => Ok(()),
+            Err(mpsc::error::SendError(Request::Action(msg))) => Err(Error::send_closed(msg)),
+            _ => unimplemented!(),
+        }
+    }
+}
+
+impl<M, R, E> SendTypedReceiver<M> for AsyncProducer<M, R, E>
+where
+    M: Message,
+    R: Message,
+    E: StdSyncSendError,
+{
+    fn send(&self, mid: u64, m: M, req: bool, _bus: &Bus) -> Result<(), Error<M>> {
+        match self.tx.send(Request::Request(mid, m, req)) {
+            Ok(_) => Ok(()),
+            Err(mpsc::error::SendError(Request::Request(_, msg, _))) => {
+                Err(Error::send_closed(msg))
+            }
+            _ => unimplemented!(),
+        }
+    }
+}
+
+impl<M, R, E> ReciveTypedReceiver<R, E> for AsyncProducer<M, R, E>
+where
+    M: Message,
+    R: Message,
+    E: StdSyncSendError,
+{
+    type Stream = Pin<Box<dyn Stream<Item = Event<R, E>> + Send>>;
+
+    fn event_stream(&self, _: Bus) -> Self::Stream {
+        let mut rx = self.srx.lock().take().unwrap();
+
+        Box::pin(futures::stream::poll_fn(move |cx| rx.poll_recv(cx)))
+    }
+}

src/receivers/synchronize_batched/async.rs

@@ -1,211 +1,121 @@
-use std::{
-    any::TypeId,
-    marker::PhantomData,
-    pin::Pin,
-    sync::{
-        atomic::{AtomicU64, Ordering},
-        Arc,
-    },
-    task::{Context, Poll},
-};
+use std::{pin::Pin, sync::Arc};
 
-use crate::{receiver::ReceiverStats, receivers::mpsc};
-use futures::{Future, StreamExt};
-use tokio::sync::Mutex;
-
-use super::{SynchronizeBatchedConfig, SynchronizeBatchedStats};
+use super::SynchronizedBatchedConfig;
 use crate::{
-    builder::{ReceiverSubscriber, ReceiverSubscriberBuilder},
-    msgs,
-    receiver::{AnyReceiver, ReceiverTrait, SendError, TypedReceiver},
+    batch_synchronized_poller_macro,
+    builder::ReceiverSubscriberBuilder,
+    error::{Error, StdSyncSendError},
+    receiver::{
+        Action, Event, ReciveTypedReceiver, SendTypedReceiver, SendUntypedReceiver,
+        UntypedPollerCallback,
+    },
+    receivers::Request,
     AsyncBatchSynchronizedHandler, Bus, Message, Untyped,
 };
 
-pub struct SynchronizeBatchedAsyncSubscriber<T, M>
-where
-    T: AsyncBatchSynchronizedHandler<M> + 'static,
-    M: Message,
-{
-    cfg: SynchronizeBatchedConfig,
-    _m: PhantomData<(T, M)>,
+use futures::{Future, Stream};
+use tokio::sync::{
+    mpsc::{self, UnboundedSender},
+    Mutex,
+};
+
+batch_synchronized_poller_macro! {
+    T,
+    AsyncBatchSynchronizedHandler,
+    |mids: Vec<_>, msgs, bus, ut: Arc<Mutex<T>>, stx: UnboundedSender<_>| {
+        tokio::spawn(async move {
+            let resp = ut.lock().await.handle(msgs, &bus).await;
+
+            crate::process_batch_result!(resp, mids, stx);
+        })
+    },
+    |bus, ut: Arc<Mutex<T>>| { async move { ut.lock().await.sync(&bus).await } }
 }
 
-impl<T, M> ReceiverSubscriber<T> for SynchronizeBatchedAsyncSubscriber<T, M>
+pub struct SynchronizedBatchedAsync<M, R, E>
 where
-    T: AsyncBatchSynchronizedHandler<M> + 'static,
+    M: Message,
+    R: Message,
+    E: StdSyncSendError,
+{
+    tx: mpsc::UnboundedSender<Request<M>>,
+    srx: parking_lot::Mutex<Option<mpsc::UnboundedReceiver<Event<R, E>>>>,
+}
+
+impl<T, M, R> ReceiverSubscriberBuilder<T, M, R, T::Error>
+    for SynchronizedBatchedAsync<M, R, T::Error>
+where
+    T: AsyncBatchSynchronizedHandler<M, Response = R> + 'static,
+    T::Error: StdSyncSendError + Clone,
+    R: Message,
     M: Message,
 {
-    fn subscribe(
-        self,
-    ) -> (
-        Arc<dyn ReceiverTrait>,
-        Box<
-            dyn FnOnce(Untyped) -> Box<dyn FnOnce(Bus) -> Pin<Box<dyn Future<Output = ()> + Send>>>,
-        >,
-    ) {
-        let cfg = self.cfg;
-        let (tx, rx) = mpsc::channel(cfg.buffer_size);
-        let stats = Arc::new(SynchronizeBatchedStats {
-            buffer: AtomicU64::new(0),
-            buffer_total: AtomicU64::new(cfg.buffer_size as _),
-            batch: AtomicU64::new(0),
-            batch_size: AtomicU64::new(cfg.batch_size as _),
-        });
+    type Config = SynchronizedBatchedConfig;
 
-        let arc = Arc::new(SynchronizeBatchedAsync::<M> {
-            tx,
-            stats: stats.clone(),
-        });
+    fn build(cfg: Self::Config) -> (Self, UntypedPollerCallback) {
+        let (stx, srx) = mpsc::unbounded_channel();
+        let (tx, rx) = mpsc::unbounded_channel();
 
         let poller = Box::new(move |ut| {
             Box::new(move |bus| {
-                Box::pin(buffer_unordered_poller::<T, M>(rx, bus, ut, stats, cfg))
+                Box::pin(batch_synchronized_poller::<T, M, R>(rx, bus, ut, cfg, stx))
                     as Pin<Box<dyn Future<Output = ()> + Send>>
             }) as Box<dyn FnOnce(Bus) -> Pin<Box<dyn Future<Output = ()> + Send>>>
         });
 
-        (arc, poller)
+        (
+            SynchronizedBatchedAsync::<M, R, T::Error> {
+                tx,
+                srx: parking_lot::Mutex::new(Some(srx)),
+            },
+            poller,
+        )
     }
 }
 
-async fn buffer_unordered_poller<T, M>(
-    rx: mpsc::Receiver<M>,
-    bus: Bus,
-    ut: Untyped,
-    stats: Arc<SynchronizeBatchedStats>,
-    cfg: SynchronizeBatchedConfig,
-) where
-    T: AsyncBatchSynchronizedHandler<M> + 'static,
-    M: Message,
-{
-    let ut = ut.downcast::<Mutex<T>>().unwrap();
-
-    let rx = rx
-        .inspect(|_|{ 
-            stats.buffer.fetch_sub(1, Ordering::Relaxed);
-            stats.batch.fetch_add(1, Ordering::Relaxed); 
-        });
-
-    let mut rx = if cfg.when_ready {
-        rx.ready_chunks(cfg.batch_size)
-            .left_stream()
-    } else {
-        rx.chunks(cfg.batch_size)
-            .right_stream()
-    };
-
-    while let Some(msgs) = rx.next().await {
-        stats.batch.fetch_sub(msgs.len() as _, Ordering::Relaxed);
-
-        let bus_clone = bus.clone();
-        let ut = ut.clone();
-
-        let res =
-            tokio::task::spawn(async move { ut.lock().await.handle(msgs, &bus_clone).await })
-                .await;
-
-        match res {
-            Ok(Err(err)) => {
-                let _ = bus.send(msgs::Error(Arc::new(err))).await;
-            }
-            _ => (),
-        }
-    }
-
-    let ut = ut.clone();
-    let bus_clone = bus.clone();
-    let res = tokio::task::spawn(async move { ut.lock().await.sync(&bus_clone).await }).await;
-
-    match res {
-        Ok(Err(err)) => {
-            let _ = bus.send(msgs::Error(Arc::new(err))).await;
-        }
-        _ => (),
-    }
-
-    println!(
-        "[EXIT] SynchronizeBatchedAsync<{}>",
-        std::any::type_name::<M>()
-    );
-}
-
-pub struct SynchronizeBatchedAsync<M: Message> {
-    tx: mpsc::Sender<M>,
-    stats: Arc<SynchronizeBatchedStats>,
-}
-
-impl<T, M> ReceiverSubscriberBuilder<M, T> for SynchronizeBatchedAsync<M>
+impl<M, R, E> SendUntypedReceiver for SynchronizedBatchedAsync<M, R, E>
 where
-    T: AsyncBatchSynchronizedHandler<M> + 'static,
     M: Message,
+    R: Message,
+    E: StdSyncSendError,
 {
-    type Entry = SynchronizeBatchedAsyncSubscriber<T, M>;
-    type Config = SynchronizeBatchedConfig;
-
-    fn build(cfg: Self::Config) -> Self::Entry {
-        SynchronizeBatchedAsyncSubscriber {
-            cfg,
-            _m: Default::default(),
+    fn send(&self, m: Action, _bus: &Bus) -> Result<(), Error<Action>> {
+        match self.tx.send(Request::Action(m)) {
+            Ok(_) => Ok(()),
+            Err(mpsc::error::SendError(Request::Action(msg))) => Err(Error::send_closed(msg)),
+            _ => unimplemented!(),
         }
     }
 }
 
-impl<M: Message> TypedReceiver<M> for SynchronizeBatchedAsync<M> {
-    fn poll_ready(&self, ctx: &mut Context<'_>) -> Poll<()> {
-        match self.tx.poll_ready(ctx) {
-            Poll::Ready(_) => Poll::Ready(()),
-            Poll::Pending => Poll::Pending,
+impl<M, R, E> SendTypedReceiver<M> for SynchronizedBatchedAsync<M, R, E>
+where
+    M: Message,
+    R: Message,
+    E: StdSyncSendError,
+{
+    fn send(&self, mid: u64, m: M, req: bool, _bus: &Bus) -> Result<(), Error<M>> {
+        match self.tx.send(Request::Request(mid, m, req)) {
+            Ok(_) => Ok(()),
+            Err(mpsc::error::SendError(Request::Request(_, msg, _))) => {
+                Err(Error::send_closed(msg))
             }
-    }
-
-    fn try_send(&self, m: M) -> Result<(), SendError<M>> {
-        match self.tx.try_send(m) {
-            Ok(_) => {
-                self.stats.buffer.fetch_add(1, Ordering::Relaxed);
-
-                Ok(())
-            }
-            Err(err) => Err(err),
+            _ => unimplemented!(),
         }
     }
 }
 
-impl<M: Message> ReceiverTrait for SynchronizeBatchedAsync<M> {
-    fn typed(&self) -> AnyReceiver<'_> {
-        AnyReceiver::new(self)
-    }
+impl<M, R, E> ReciveTypedReceiver<R, E> for SynchronizedBatchedAsync<M, R, E>
+where
+    M: Message,
+    R: Message,
+    E: StdSyncSendError,
+{
+    type Stream = Pin<Box<dyn Stream<Item = Event<R, E>> + Send>>;
 
-    fn type_id(&self) -> TypeId {
-        TypeId::of::<Self>()
-    }
+    fn event_stream(&self, _: Bus) -> Self::Stream {
+        let mut rx = self.srx.lock().take().unwrap();
 
-    fn close(&self) {
-        self.tx.close();
-    }
-
-    fn stats(&self) -> ReceiverStats {
-        ReceiverStats {
-            name: std::any::type_name::<M>().into(),
-            fields: vec![
-                ("buffer".into(), self.stats.buffer.load(Ordering::SeqCst)),
-                (
-                    "buffer_total".into(),
-                    self.stats.buffer_total.load(Ordering::SeqCst),
-                ),
-                ("batch".into(), self.stats.batch.load(Ordering::SeqCst)),
-                (
-                    "batch_size".into(),
-                    self.stats.batch_size.load(Ordering::SeqCst),
-                ),
-            ],
-        }
-    }
-
-    fn sync(&self) {
-        self.tx.flush();
-    }
-
-    fn poll_synchronized(&self, _ctx: &mut Context<'_>) -> Poll<()> {
-        Poll::Ready(())
+        Box::pin(futures::stream::poll_fn(move |cx| rx.poll_recv(cx)))
     }
 }

src/receivers/synchronize_batched/mod.rs

@@ -3,31 +3,104 @@ mod sync;
 
 use std::sync::atomic::AtomicU64;
 
-pub use sync::{SynchronizeBatchedSync, SynchronizeBatchedSyncSubscriber};
-
-pub use r#async::{SynchronizeBatchedAsync, SynchronizeBatchedAsyncSubscriber};
+pub use r#async::SynchronizedBatchedAsync;
+use serde_derive::{Deserialize, Serialize};
+pub use sync::SynchronizedBatchedSync;
 
 #[derive(Debug)]
-pub struct SynchronizeBatchedStats {
+pub struct SynchronizedBatchedStats {
     pub buffer: AtomicU64,
     pub buffer_total: AtomicU64,
     pub batch: AtomicU64,
     pub batch_size: AtomicU64,
 }
 
-#[derive(Copy, Clone, Debug)]
-pub struct SynchronizeBatchedConfig {
+#[derive(Copy, Clone, Debug, Serialize, Deserialize)]
+pub struct SynchronizedBatchedConfig {
     pub buffer_size: usize,
     pub batch_size: usize,
     pub when_ready: bool,
 }
 
-impl Default for SynchronizeBatchedConfig {
+impl Default for SynchronizedBatchedConfig {
     fn default() -> Self {
         Self {
             buffer_size: 4,
-            batch_size: 16,
+            batch_size: 8,
             when_ready: false,
         }
     }
 }
+
+#[macro_export]
+macro_rules! batch_synchronized_poller_macro {
+    ($t: tt, $h: tt, $st1: expr, $st2: expr) => {
+        async fn batch_synchronized_poller<$t, M, R>(
+            mut rx: mpsc::UnboundedReceiver<Request<M>>,
+            bus: Bus,
+            ut: Untyped,
+            // stats: Arc<SynchronizedBatchedStats>,
+            cfg: SynchronizedBatchedConfig,
+            stx: mpsc::UnboundedSender<Event<R, $t::Error>>,
+        ) where
+            $t: $h<M, Response = R> + 'static,
+            $t::Error: StdSyncSendError + Clone,
+            M: Message,
+            R: Message,
+        {
+            let ut = ut.downcast::<Mutex<T>>().unwrap();
+
+            let mut buffer_mid = Vec::with_capacity(cfg.batch_size);
+            let mut buffer = Vec::with_capacity(cfg.batch_size);
+
+            while let Some(msg) = rx.recv().await {
+                let bus = bus.clone();
+                let ut = ut.clone();
+                let stx = stx.clone();
+
+                match msg {
+                    Request::Request(mid, msg, req) => {
+                        buffer_mid.push((mid, req));
+                        buffer.push(msg);
+
+                        if buffer_mid.len() >= cfg.batch_size {
+                            let buffer_mid_clone = buffer_mid.drain(..).collect::<Vec<_>>();
+                            let buffer_clone = buffer.drain(..).collect();
+
+                            #[allow(clippy::redundant_closure_call)]
+                            let _ = ($st1)(buffer_mid_clone, buffer_clone, bus, ut, stx);
+                        }
+                    }
+                    Request::Action(Action::Init(..)) => {
+                        stx.send(Event::Ready).unwrap();
+                    }
+                    Request::Action(Action::Close) => {
+                        rx.close();
+                    }
+                    Request::Action(Action::Flush) => {
+                        let stx_clone = stx.clone();
+
+                        if !buffer_mid.is_empty() {
+                            let buffer_mid_clone = buffer_mid.drain(..).collect::<Vec<_>>();
+                            let buffer_clone = buffer.drain(..).collect();
+
+                            #[allow(clippy::redundant_closure_call)]
+                            let _ = ($st1)(buffer_mid_clone, buffer_clone, bus, ut, stx);
+                        }
+
+                        stx_clone.send(Event::Flushed).unwrap();
+                    }
+
+                    Request::Action(Action::Sync) => {
+                        #[allow(clippy::redundant_closure_call)]
+                        let resp = ($st2)(bus.clone(), ut.clone()).await;
+                        stx.send(Event::Synchronized(resp.map_err(Error::Other)))
+                            .unwrap();
+                    }
+
+                    _ => unimplemented!(),
+                }
+            }
+        }
+    };
+}

src/receivers/synchronize_batched/sync.rs

@@ -1,213 +1,125 @@
-use super::{SynchronizeBatchedConfig, SynchronizeBatchedStats};
+use std::{pin::Pin, sync::Arc};
+
 use crate::{
-    builder::{ReceiverSubscriber, ReceiverSubscriberBuilder},
-    msgs,
-    receiver::{AnyReceiver, ReceiverTrait, SendError, TypedReceiver},
+    batch_synchronized_poller_macro,
+    builder::ReceiverSubscriberBuilder,
+    error::{Error, StdSyncSendError},
+    receiver::{
+        Action, Event, ReciveTypedReceiver, SendTypedReceiver, SendUntypedReceiver,
+        UntypedPollerCallback,
+    },
+    receivers::Request,
     BatchSynchronizedHandler, Bus, Message, Untyped,
 };
-use crate::{receiver::ReceiverStats, receivers::mpsc};
-use futures::{Future, StreamExt};
-use std::{
-    any::TypeId,
-    marker::PhantomData,
-    pin::Pin,
-    sync::{
-        atomic::{AtomicU64, Ordering},
-        Arc,
-    },
-    task::{Context, Poll},
-};
-use tokio::sync::Mutex;
 
-pub struct SynchronizeBatchedSyncSubscriber<T, M>
-where
-    T: BatchSynchronizedHandler<M> + 'static,
-    M: Message,
-{
-    cfg: SynchronizeBatchedConfig,
-    _m: PhantomData<(M, T)>,
+use super::SynchronizedBatchedConfig;
+use futures::{executor::block_on, Future, Stream};
+use tokio::sync::{
+    mpsc::{self, UnboundedSender},
+    Mutex,
+};
+
+batch_synchronized_poller_macro! {
+    T,
+    BatchSynchronizedHandler,
+    |mids: Vec<_>, msgs, bus, ut: Arc<Mutex<T>>, stx: UnboundedSender<_>| {
+        tokio::task::spawn_blocking(move || {
+            let resp = block_on(ut.lock()).handle(msgs, &bus);
+
+            crate::process_batch_result!(resp, mids, stx);
+        })
+    },
+    |bus, ut: Arc<Mutex<T>>| async move {
+        tokio::task::spawn_blocking(move || block_on(ut.lock()).sync(&bus))
+            .await
+            .unwrap()
+    }
 }
 
-impl<T, M> ReceiverSubscriber<T> for SynchronizeBatchedSyncSubscriber<T, M>
+pub struct SynchronizedBatchedSync<M, R, E>
 where
-    T: BatchSynchronizedHandler<M> + 'static,
+    M: Message,
+    R: Message,
+    E: StdSyncSendError,
+{
+    tx: mpsc::UnboundedSender<Request<M>>,
+    srx: parking_lot::Mutex<Option<mpsc::UnboundedReceiver<Event<R, E>>>>,
+}
+
+impl<T, M, R> ReceiverSubscriberBuilder<T, M, R, T::Error>
+    for SynchronizedBatchedSync<M, R, T::Error>
+where
+    T: BatchSynchronizedHandler<M, Response = R> + 'static,
+    T::Error: StdSyncSendError,
+    R: Message,
     M: Message,
 {
-    fn subscribe(
-        self,
-    ) -> (
-        Arc<dyn ReceiverTrait>,
-        Box<
-            dyn FnOnce(Untyped) -> Box<dyn FnOnce(Bus) -> Pin<Box<dyn Future<Output = ()> + Send>>>,
-        >,
-    ) {
-        let cfg = self.cfg;
-        let (tx, rx) = mpsc::channel(cfg.buffer_size);
-        let stats = Arc::new(SynchronizeBatchedStats {
-            buffer: AtomicU64::new(0),
-            buffer_total: AtomicU64::new(cfg.buffer_size as _),
-            batch: AtomicU64::new(0),
-            batch_size: AtomicU64::new(cfg.batch_size as _),
-        });
+    type Config = SynchronizedBatchedConfig;
+
+    fn build(cfg: Self::Config) -> (Self, UntypedPollerCallback) {
+        let (stx, srx) = mpsc::unbounded_channel();
+        let (tx, rx) = mpsc::unbounded_channel();
 
-        let arc = Arc::new(SynchronizeBatchedSync::<M> {
-            tx,
-            stats: stats.clone(),
-        });
         let poller = Box::new(move |ut| {
             Box::new(move |bus| {
-                Box::pin(buffer_unordered_poller::<T, M>(rx, bus, ut, stats, cfg))
+                Box::pin(batch_synchronized_poller::<T, M, R>(rx, bus, ut, cfg, stx))
                     as Pin<Box<dyn Future<Output = ()> + Send>>
             }) as Box<dyn FnOnce(Bus) -> Pin<Box<dyn Future<Output = ()> + Send>>>
         });
 
-        (arc, poller)
+        (
+            SynchronizedBatchedSync::<M, R, T::Error> {
+                tx,
+                srx: parking_lot::Mutex::new(Some(srx)),
+            },
+            poller,
+        )
     }
 }
 
-async fn buffer_unordered_poller<T, M>(
-    rx: mpsc::Receiver<M>,
-    bus: Bus,
-    ut: Untyped,
-    stats: Arc<SynchronizeBatchedStats>,
-    cfg: SynchronizeBatchedConfig,
-) where
-    T: BatchSynchronizedHandler<M> + 'static,
-    M: Message,
-{
-    let ut = ut.downcast::<Mutex<T>>().unwrap();
-
-    let rx = rx
-        .inspect(|_|{ 
-            stats.buffer.fetch_sub(1, Ordering::Relaxed);
-            stats.batch.fetch_add(1, Ordering::Relaxed); 
-        });
-
-    let mut rx = if cfg.when_ready {
-        rx.ready_chunks(cfg.batch_size)
-            .left_stream()
-    } else {
-        rx.chunks(cfg.batch_size)
-            .right_stream()
-    };
-
-    while let Some(msgs) = rx.next().await {
-        stats.batch.fetch_sub(msgs.len() as _, Ordering::Relaxed);
-
-        let bus_clone = bus.clone();
-        let ut = ut.clone();
-
-        let res = tokio::task::spawn_blocking(move || {
-            let mut uut = futures::executor::block_on(ut.lock());
-            
-            uut.handle(msgs, &bus_clone)
-        }).await;
-
-        match res {
-            Ok(Err(err)) => {
-                let _ = bus.send(msgs::Error(Arc::new(err))).await;
-            }
-            _ => (),
-        }
-    }
-
-    let ut = ut.clone();
-    let bus_clone = bus.clone();
-    let res = tokio::task::spawn_blocking(move || {
-        futures::executor::block_on(ut.lock()).sync(&bus_clone)
-    })
-    .await;
-
-    match res {
-        Ok(Err(err)) => {
-            let _ = bus.send(msgs::Error(Arc::new(err))).await;
-        }
-        _ => (),
-    }
-
-    println!(
-        "[EXIT] SynchronizeBatchedSync<{}>",
-        std::any::type_name::<M>()
-    );
-}
-
-pub struct SynchronizeBatchedSync<M: Message> {
-    tx: mpsc::Sender<M>,
-    stats: Arc<SynchronizeBatchedStats>,
-}
-
-impl<T, M> ReceiverSubscriberBuilder<M, T> for SynchronizeBatchedSync<M>
+impl<M, R, E> SendUntypedReceiver for SynchronizedBatchedSync<M, R, E>
 where
-    T: BatchSynchronizedHandler<M> + 'static,
     M: Message,
+    R: Message,
+    E: StdSyncSendError,
 {
-    type Entry = SynchronizeBatchedSyncSubscriber<T, M>;
-    type Config = SynchronizeBatchedConfig;
-
-    fn build(cfg: Self::Config) -> Self::Entry {
-        SynchronizeBatchedSyncSubscriber {
-            cfg,
-            _m: Default::default(),
+    fn send(&self, msg: Action, _bus: &Bus) -> Result<(), Error<Action>> {
+        match self.tx.send(Request::Action(msg)) {
+            Ok(_) => Ok(()),
+            Err(mpsc::error::SendError(Request::Action(msg))) => Err(Error::send_closed(msg)),
+            _ => unimplemented!(),
         }
     }
 }
 
-impl<M: Message> TypedReceiver<M> for SynchronizeBatchedSync<M> {
-    fn poll_ready(&self, ctx: &mut Context<'_>) -> Poll<()> {
-        match self.tx.poll_ready(ctx) {
-            Poll::Ready(_) => Poll::Ready(()),
-            Poll::Pending => Poll::Pending,
+impl<M, R, E> SendTypedReceiver<M> for SynchronizedBatchedSync<M, R, E>
+where
+    M: Message,
+    R: Message,
+    E: StdSyncSendError,
+{
+    fn send(&self, mid: u64, m: M, req: bool, _bus: &Bus) -> Result<(), Error<M>> {
+        match self.tx.send(Request::Request(mid, m, req)) {
+            Ok(_) => Ok(()),
+            Err(mpsc::error::SendError(Request::Request(_, msg, _))) => {
+                Err(Error::send_closed(msg))
             }
-    }
-
-    fn try_send(&self, m: M) -> Result<(), SendError<M>> {
-        match self.tx.try_send(m) {
-            Ok(_) => {
-                self.stats.buffer.fetch_add(1, Ordering::Relaxed);
-
-                Ok(())
-            }
-            Err(err) => Err(err),
+            _ => unimplemented!(),
         }
     }
 }
 
-impl<M: Message> ReceiverTrait for SynchronizeBatchedSync<M> {
-    fn typed(&self) -> AnyReceiver<'_> {
-        AnyReceiver::new(self)
-    }
+impl<M, R, E> ReciveTypedReceiver<R, E> for SynchronizedBatchedSync<M, R, E>
+where
+    M: Message,
+    R: Message,
+    E: StdSyncSendError,
+{
+    type Stream = Pin<Box<dyn Stream<Item = Event<R, E>> + Send>>;
 
-    fn type_id(&self) -> TypeId {
-        TypeId::of::<Self>()
-    }
+    fn event_stream(&self, _: Bus) -> Self::Stream {
+        let mut rx = self.srx.lock().take().unwrap();
 
-    fn stats(&self) -> ReceiverStats {
-        ReceiverStats {
-            name: std::any::type_name::<M>().into(),
-            fields: vec![
-                ("buffer".into(), self.stats.buffer.load(Ordering::SeqCst)),
-                (
-                    "buffer_total".into(),
-                    self.stats.buffer_total.load(Ordering::SeqCst),
-                ),
-                ("batch".into(), self.stats.batch.load(Ordering::SeqCst)),
-                (
-                    "batch_size".into(),
-                    self.stats.batch_size.load(Ordering::SeqCst),
-                ),
-            ],
-        }
-    }
-
-    fn close(&self) {
-        self.tx.close();
-    }
-
-    fn sync(&self) {
-        self.tx.flush();
-    }
-
-    fn poll_synchronized(&self, _ctx: &mut Context<'_>) -> Poll<()> {
-        Poll::Ready(())
+        Box::pin(futures::stream::poll_fn(move |cx| rx.poll_recv(cx)))
     }
 }

src/receivers/synchronized/async.rs

@@ -1,186 +1,121 @@
-use std::{
-    any::TypeId,
-    marker::PhantomData,
-    pin::Pin,
-    sync::{
-        atomic::{AtomicU64, Ordering},
-        Arc,
-    },
-    task::{Context, Poll},
-};
+use std::{pin::Pin, sync::Arc};
 
-use crate::{receiver::ReceiverStats, receivers::mpsc};
-use futures::{Future, StreamExt};
-use tokio::sync::Mutex;
+use crate::{receiver::UntypedPollerCallback, synchronized_poller_macro};
+use futures::{Future, Stream};
 
-use super::{SynchronizedConfig, SynchronizedStats};
+use super::SynchronizedConfig;
 use crate::{
-    builder::{ReceiverSubscriber, ReceiverSubscriberBuilder},
-    msgs,
-    receiver::{AnyReceiver, ReceiverTrait, SendError, TypedReceiver},
+    builder::ReceiverSubscriberBuilder,
+    error::{Error, StdSyncSendError},
+    receiver::{Action, Event, ReciveTypedReceiver, SendTypedReceiver, SendUntypedReceiver},
+    receivers::Request,
     AsyncSynchronizedHandler, Bus, Message, Untyped,
 };
+use tokio::sync::{
+    mpsc::{self, UnboundedSender},
+    Mutex,
+};
 
-pub struct SynchronizedAsyncSubscriber<T, M>
-where
-    T: AsyncSynchronizedHandler<M> + 'static,
-    M: Message,
-{
-    cfg: SynchronizedConfig,
-    _m: PhantomData<(T, M)>,
+synchronized_poller_macro! {
+    T,
+    AsyncSynchronizedHandler,
+    |mid, msg, bus, ut: Arc<Mutex<T>>, stx: UnboundedSender<_>| {
+        tokio::spawn(async move {
+            let resp = ut.lock().await.handle(msg, &bus).await;
+
+            stx.send(Event::Response(mid, resp.map_err(Error::Other)))
+                .unwrap();
+        })
+    },
+
+    |bus, ut: Arc<Mutex<T>>| async move {
+        ut.lock().await.sync(&bus).await
+    }
 }
 
-impl<T, M> ReceiverSubscriber<T> for SynchronizedAsyncSubscriber<T, M>
+pub struct SynchronizedAsync<M, R, E>
 where
-    T: AsyncSynchronizedHandler<M> + 'static,
     M: Message,
+    R: Message,
+    E: StdSyncSendError,
 {
-    fn subscribe(
-        self,
-    ) -> (
-        Arc<dyn ReceiverTrait>,
-        Box<
-            dyn FnOnce(Untyped) -> Box<dyn FnOnce(Bus) -> Pin<Box<dyn Future<Output = ()> + Send>>>,
-        >,
-    ) {
-        let cfg = self.cfg;
-        let (tx, rx) = mpsc::channel(cfg.buffer_size);
-        let stats = Arc::new(SynchronizedStats {
-            buffer: AtomicU64::new(0),
-            buffer_total: AtomicU64::new(cfg.buffer_size as _),
-        });
+    tx: mpsc::UnboundedSender<Request<M>>,
+    srx: parking_lot::Mutex<Option<mpsc::UnboundedReceiver<Event<R, E>>>>,
+}
 
-        let arc = Arc::new(SynchronizedAsync::<M> {
-            tx,
-            stats: stats.clone(),
-        });
+impl<T, M, R, E> ReceiverSubscriberBuilder<T, M, R, E> for SynchronizedAsync<M, R, E>
+where
+    T: AsyncSynchronizedHandler<M, Response = R, Error = E> + 'static,
+    R: Message,
+    M: Message,
+    E: StdSyncSendError,
+{
+    type Config = SynchronizedConfig;
+
+    fn build(_cfg: Self::Config) -> (Self, UntypedPollerCallback) {
+        let (stx, srx) = mpsc::unbounded_channel();
+        let (tx, rx) = mpsc::unbounded_channel();
 
         let poller = Box::new(move |ut| {
             Box::new(move |bus| {
-                Box::pin(buffer_unordered_poller::<T, M>(rx, bus, ut, stats, cfg))
+                Box::pin(synchronized_poller::<T, M, R>(rx, bus, ut, stx))
                     as Pin<Box<dyn Future<Output = ()> + Send>>
             }) as Box<dyn FnOnce(Bus) -> Pin<Box<dyn Future<Output = ()> + Send>>>
         });
 
-        (arc, poller)
-    }
-}
-
-async fn buffer_unordered_poller<T, M>(
-    rx: mpsc::Receiver<M>,
-    bus: Bus,
-    ut: Untyped,
-    stats: Arc<SynchronizedStats>,
-    _cfg: SynchronizedConfig,
-) where
-    T: AsyncSynchronizedHandler<M> + 'static,
-    M: Message,
-{
-    let ut = ut.downcast::<Mutex<T>>().unwrap();
-    let mut x = rx.then(|msg| {
-        let bus = bus.clone();
-        let ut = ut.clone();
-
-        tokio::task::spawn(async move { ut.lock().await.handle(msg, &bus).await })
-    });
-
-    while let Some(err) = x.next().await {
-        stats.buffer.fetch_sub(1, Ordering::Relaxed);
-
-        match err {
-            Ok(Err(err)) => {
-                let _ = bus.send(msgs::Error(Arc::new(err))).await;
-            }
-            _ => (),
-        }
-    }
-
-    let ut = ut.clone();
-    let bus_clone = bus.clone();
-    let res = tokio::task::spawn(async move { ut.lock().await.sync(&bus_clone).await }).await;
-
-    match res {
-        Ok(Err(err)) => {
-            let _ = bus.send(msgs::Error(Arc::new(err))).await;
-        }
-        _ => (),
-    }
-
-    println!("[EXIT] SynchronizedAsync<{}>", std::any::type_name::<M>());
-}
-
-pub struct SynchronizedAsync<M: Message> {
-    tx: mpsc::Sender<M>,
-    stats: Arc<SynchronizedStats>,
-}
-
-impl<T, M> ReceiverSubscriberBuilder<M, T> for SynchronizedAsync<M>
-where
-    T: AsyncSynchronizedHandler<M> + 'static,
-    M: Message,
-{
-    type Entry = SynchronizedAsyncSubscriber<T, M>;
-    type Config = SynchronizedConfig;
-
-    fn build(cfg: Self::Config) -> Self::Entry {
-        SynchronizedAsyncSubscriber {
-            cfg,
-            _m: Default::default(),
-        }
-    }
-}
-
-impl<M: Message> TypedReceiver<M> for SynchronizedAsync<M> {
-    fn poll_ready(&self, ctx: &mut Context<'_>) -> Poll<()> {
-        match self.tx.poll_ready(ctx) {
-            Poll::Ready(_) => Poll::Ready(()),
-            Poll::Pending => Poll::Pending,
-        }
-    }
-
-    fn try_send(&self, m: M) -> Result<(), SendError<M>> {
-        match self.tx.try_send(m) {
-            Ok(_) => {
-                self.stats.buffer.fetch_add(1, Ordering::Relaxed);
-
-                Ok(())
-            }
-            Err(err) => Err(err),
-        }
-    }
-}
-
-impl<M: Message> ReceiverTrait for SynchronizedAsync<M> {
-    fn typed(&self) -> AnyReceiver<'_> {
-        AnyReceiver::new(self)
-    }
-
-    fn type_id(&self) -> TypeId {
-        TypeId::of::<SynchronizedAsync<M>>()
-    }
-
-    fn stats(&self) -> ReceiverStats {
-        ReceiverStats {
-            name: std::any::type_name::<M>().into(),
-            fields: vec![
-                ("buffer".into(), self.stats.buffer.load(Ordering::SeqCst)),
         (
-                    "buffer_total".into(),
-                    self.stats.buffer_total.load(Ordering::SeqCst),
-                ),
-            ],
-        }
-    }
-
-    fn close(&self) {
-        self.tx.close();
-    }
-
-    fn sync(&self) {
-        self.tx.flush();
-    }
-
-    fn poll_synchronized(&self, _ctx: &mut Context<'_>) -> Poll<()> {
-        Poll::Ready(())
+            SynchronizedAsync::<M, R, E> {
+                tx,
+                srx: parking_lot::Mutex::new(Some(srx)),
+            },
+            poller,
+        )
+    }
+}
+
+impl<M, R, E> SendUntypedReceiver for SynchronizedAsync<M, R, E>
+where
+    M: Message,
+    R: Message,
+    E: StdSyncSendError,
+{
+    fn send(&self, m: Action, _bus: &Bus) -> Result<(), Error<Action>> {
+        match self.tx.send(Request::Action(m)) {
+            Ok(_) => Ok(()),
+            Err(mpsc::error::SendError(Request::Action(msg))) => Err(Error::send_closed(msg)),
+            _ => unimplemented!(),
+        }
+    }
+}
+
+impl<M, R, E> SendTypedReceiver<M> for SynchronizedAsync<M, R, E>
+where
+    M: Message,
+    R: Message,
+    E: StdSyncSendError,
+{
+    fn send(&self, mid: u64, m: M, req: bool, _bus: &Bus) -> Result<(), Error<M>> {
+        match self.tx.send(Request::Request(mid, m, req)) {
+            Ok(_) => Ok(()),
+            Err(mpsc::error::SendError(Request::Request(_, msg, _))) => {
+                Err(Error::send_closed(msg))
+            }
+            _ => unimplemented!(),
+        }
+    }
+}
+
+impl<M, R, E> ReciveTypedReceiver<R, E> for SynchronizedAsync<M, R, E>
+where
+    M: Message,
+    R: Message,
+    E: StdSyncSendError,
+{
+    type Stream = Pin<Box<dyn Stream<Item = Event<R, E>> + Send>>;
+
+    fn event_stream(&self, _: Bus) -> Self::Stream {
+        let mut rx = self.srx.lock().take().unwrap();
+
+        Box::pin(futures::stream::poll_fn(move |cx| rx.poll_recv(cx)))
     }
 }

src/receivers/synchronized/mod.rs

@@ -3,9 +3,9 @@ mod sync;
 
 use std::sync::atomic::AtomicU64;
 
-pub use sync::{SynchronizedSync, SynchronizedSyncSubscriber};
-
-pub use r#async::{SynchronizedAsync, SynchronizedAsyncSubscriber};
+pub use r#async::SynchronizedAsync;
+use serde_derive::{Deserialize, Serialize};
+pub use sync::SynchronizedSync;
 
 #[derive(Debug)]
 pub struct SynchronizedStats {
@@ -13,7 +13,7 @@ pub struct SynchronizedStats {
     pub buffer_total: AtomicU64,
 }
 
-#[derive(Copy, Clone, Debug)]
+#[derive(Clone, Debug, Serialize, Deserialize)]
 pub struct SynchronizedConfig {
     pub buffer_size: usize,
 }
@@ -23,3 +23,51 @@ impl Default for SynchronizedConfig {
         Self { buffer_size: 1 }
     }
 }
+
+#[macro_export]
+macro_rules! synchronized_poller_macro {
+    ($t: tt, $h: tt, $st1: expr, $st2: expr) => {
+        async fn synchronized_poller<$t, M, R>(
+            mut rx: mpsc::UnboundedReceiver<Request<M>>,
+            bus: Bus,
+            ut: Untyped,
+            stx: mpsc::UnboundedSender<Event<R, $t::Error>>,
+        ) where
+            $t: $h<M, Response = R> + 'static,
+            $t::Error: StdSyncSendError,
+            M: Message,
+            R: Message,
+        {
+            let ut = ut.downcast::<Mutex<T>>().unwrap();
+
+            while let Some(msg) = rx.recv().await {
+                match msg {
+                    Request::Request(mid, msg, _req) =>
+                    {
+                        #[allow(clippy::redundant_closure_call)]
+                        ($st1)(mid, msg, bus.clone(), ut.clone(), stx.clone())
+                            .await
+                            .unwrap()
+                    }
+                    Request::Action(Action::Init(..)) => {
+                        stx.send(Event::Ready).unwrap();
+                    }
+                    Request::Action(Action::Close) => {
+                        rx.close();
+                    }
+                    Request::Action(Action::Flush) => {
+                        stx.send(Event::Flushed).unwrap();
+                    }
+                    Request::Action(Action::Sync) => {
+                        #[allow(clippy::redundant_closure_call)]
+                        let resp = ($st2)(bus.clone(), ut.clone()).await;
+                        stx.send(Event::Synchronized(resp.map_err(Error::Other)))
+                            .unwrap();
+                    }
+
+                    _ => unimplemented!(),
+                }
+            }
+        }
+    };
+}

src/receivers/synchronized/sync.rs

@@ -1,190 +1,122 @@
-use super::{SynchronizedConfig, SynchronizedStats};
-use crate::{receiver::ReceiverStats, receivers::mpsc};
-use futures::{executor::block_on, Future, StreamExt};
-use std::{
-    any::TypeId,
-    marker::PhantomData,
-    pin::Pin,
-    sync::{
-        atomic::{AtomicU64, Ordering},
-        Arc,
-    },
-    task::{Context, Poll},
-};
-use tokio::sync::Mutex;
+use std::{pin::Pin, sync::Arc};
 
+use crate::{receiver::UntypedPollerCallback, synchronized_poller_macro};
+use futures::{executor::block_on, Future, Stream};
+
+use super::SynchronizedConfig;
 use crate::{
-    builder::{ReceiverSubscriber, ReceiverSubscriberBuilder},
-    msgs,
-    receiver::{AnyReceiver, ReceiverTrait, SendError, TypedReceiver},
+    builder::ReceiverSubscriberBuilder,
+    error::{Error, StdSyncSendError},
+    receiver::{Action, Event, ReciveTypedReceiver, SendTypedReceiver, SendUntypedReceiver},
+    receivers::Request,
     Bus, Message, SynchronizedHandler, Untyped,
 };
+use tokio::sync::{
+    mpsc::{self, UnboundedSender},
+    Mutex,
+};
 
-pub struct SynchronizedSyncSubscriber<T, M>
-where
-    T: SynchronizedHandler<M> + 'static,
-    M: Message,
-{
-    cfg: SynchronizedConfig,
-    _m: PhantomData<(M, T)>,
+synchronized_poller_macro! {
+    T,
+    SynchronizedHandler,
+    |mid, msg, bus, ut: Arc<Mutex<T>>, stx: UnboundedSender<_>| {
+        tokio::task::spawn_blocking(move || {
+            let resp = block_on(ut.lock()).handle(msg, &bus);
+
+            stx.send(Event::Response(mid, resp.map_err(Error::Other)))
+                .unwrap();
+        })
+    },
+    |bus, ut: Arc<Mutex<T>>| async move {
+        tokio::task::spawn_blocking(move || block_on(ut.lock()).sync(&bus))
+            .await
+            .unwrap()
+    }
 }
 
-impl<T, M> ReceiverSubscriber<T> for SynchronizedSyncSubscriber<T, M>
+pub struct SynchronizedSync<M, R, E>
 where
-    T: SynchronizedHandler<M> + 'static,
     M: Message,
+    R: Message,
+    E: StdSyncSendError,
 {
-    fn subscribe(
-        self,
-    ) -> (
-        Arc<dyn ReceiverTrait>,
-        Box<
-            dyn FnOnce(Untyped) -> Box<dyn FnOnce(Bus) -> Pin<Box<dyn Future<Output = ()> + Send>>>,
-        >,
-    ) {
-        let cfg = self.cfg;
-        let (tx, rx) = mpsc::channel(cfg.buffer_size);
-        let stats = Arc::new(SynchronizedStats {
-            buffer: AtomicU64::new(0),
-            buffer_total: AtomicU64::new(cfg.buffer_size as _),
-        });
+    tx: mpsc::UnboundedSender<Request<M>>,
+    srx: parking_lot::Mutex<Option<mpsc::UnboundedReceiver<Event<R, E>>>>,
+}
+
+impl<T, M, R, E> ReceiverSubscriberBuilder<T, M, R, E> for SynchronizedSync<M, R, E>
+where
+    T: SynchronizedHandler<M, Response = R, Error = E> + 'static,
+    R: Message,
+    M: Message,
+    E: StdSyncSendError,
+{
+    type Config = SynchronizedConfig;
+
+    fn build(_cfg: Self::Config) -> (Self, UntypedPollerCallback) {
+        let (stx, srx) = mpsc::unbounded_channel();
+        let (tx, rx) = mpsc::unbounded_channel();
 
-        let arc = Arc::new(SynchronizedSync::<M> {
-            tx,
-            stats: stats.clone(),
-        });
         let poller = Box::new(move |ut| {
             Box::new(move |bus| {
-                Box::pin(buffer_unordered_poller::<T, M>(rx, bus, ut, stats, cfg))
+                Box::pin(synchronized_poller::<T, M, R>(rx, bus, ut, stx))
                     as Pin<Box<dyn Future<Output = ()> + Send>>
             }) as Box<dyn FnOnce(Bus) -> Pin<Box<dyn Future<Output = ()> + Send>>>
         });
 
-        (arc, poller)
-    }
-}
-
-async fn buffer_unordered_poller<T, M>(
-    rx: mpsc::Receiver<M>,
-    bus: Bus,
-    ut: Untyped,
-    stats: Arc<SynchronizedStats>,
-    _cfg: SynchronizedConfig,
-) where
-    T: SynchronizedHandler<M> + 'static,
-    M: Message,
-{
-    let ut = ut.downcast::<Mutex<T>>().unwrap();
-    let mut x = rx.then(|msg| {
-        let ut = ut.clone();
-        let bus = bus.clone();
-
-        tokio::task::spawn_blocking(move || block_on(ut.lock()).handle(msg, &bus))
-    });
-
-    while let Some(err) = x.next().await {
-        stats.buffer.fetch_sub(1, Ordering::Relaxed);
-
-        match err {
-            Ok(Err(err)) => {
-                let _ = bus.send(msgs::Error(Arc::new(err))).await;
-            }
-            _ => (),
-        }
-    }
-
-    let ut = ut.clone();
-    let bus_clone = bus.clone();
-    let res = tokio::task::spawn_blocking(move || {
-        futures::executor::block_on(ut.lock()).sync(&bus_clone)
-    })
-    .await;
-
-    match res {
-        Ok(Err(err)) => {
-            let _ = bus.send(msgs::Error(Arc::new(err))).await;
-        }
-        _ => (),
-    }
-
-    println!(
-        "[EXIT] BufferUnorderedSync<{}>",
-        std::any::type_name::<M>()
-    );
-}
-
-pub struct SynchronizedSync<M: Message> {
-    tx: mpsc::Sender<M>,
-    stats: Arc<SynchronizedStats>,
-}
-
-impl<T, M> ReceiverSubscriberBuilder<M, T> for SynchronizedSync<M>
-where
-    T: SynchronizedHandler<M> + 'static,
-    M: Message,
-{
-    type Entry = SynchronizedSyncSubscriber<T, M>;
-    type Config = SynchronizedConfig;
-
-    fn build(cfg: Self::Config) -> Self::Entry {
-        SynchronizedSyncSubscriber {
-            cfg,
-            _m: Default::default(),
-        }
-    }
-}
-
-impl<M: Message> TypedReceiver<M> for SynchronizedSync<M> {
-    fn poll_ready(&self, ctx: &mut Context<'_>) -> Poll<()> {
-        match self.tx.poll_ready(ctx) {
-            Poll::Ready(_) => Poll::Ready(()),
-            Poll::Pending => Poll::Pending,
-        }
-    }
-
-    fn try_send(&self, m: M) -> Result<(), SendError<M>> {
-        match self.tx.try_send(m) {
-            Ok(_) => {
-                self.stats.buffer.fetch_add(1, Ordering::Relaxed);
-
-                Ok(())
-            }
-            Err(err) => Err(err),
-        }
-    }
-}
-
-impl<M: Message> ReceiverTrait for SynchronizedSync<M> {
-    fn typed(&self) -> AnyReceiver<'_> {
-        AnyReceiver::new(self)
-    }
-
-    fn type_id(&self) -> TypeId {
-        TypeId::of::<SynchronizedSync<M>>()
-    }
-
-    fn stats(&self) -> ReceiverStats {
-        ReceiverStats {
-            name: std::any::type_name::<M>().into(),
-            fields: vec![
-                ("buffer".into(), self.stats.buffer.load(Ordering::SeqCst)),
         (
-                    "buffer_total".into(),
-                    self.stats.buffer_total.load(Ordering::SeqCst),
-                ),
-            ],
-        }
-    }
-
-    fn close(&self) {
-        self.tx.close();
-    }
-
-    fn sync(&self) {
-        self.tx.flush();
-    }
-
-    fn poll_synchronized(&self, _ctx: &mut Context<'_>) -> Poll<()> {
-        Poll::Ready(())
+            SynchronizedSync::<M, R, E> {
+                tx,
+                srx: parking_lot::Mutex::new(Some(srx)),
+            },
+            poller,
+        )
+    }
+}
+
+impl<M, R, E> SendUntypedReceiver for SynchronizedSync<M, R, E>
+where
+    M: Message,
+    R: Message,
+    E: StdSyncSendError,
+{
+    fn send(&self, msg: Action, _bus: &Bus) -> Result<(), Error<Action>> {
+        match self.tx.send(Request::Action(msg)) {
+            Ok(_) => Ok(()),
+            Err(mpsc::error::SendError(Request::Action(msg))) => Err(Error::send_closed(msg)),
+            _ => unimplemented!(),
+        }
+    }
+}
+
+impl<M, R, E> SendTypedReceiver<M> for SynchronizedSync<M, R, E>
+where
+    M: Message,
+    R: Message,
+    E: StdSyncSendError,
+{
+    fn send(&self, mid: u64, m: M, req: bool, _bus: &Bus) -> Result<(), Error<M>> {
+        match self.tx.send(Request::Request(mid, m, req)) {
+            Ok(_) => Ok(()),
+            Err(mpsc::error::SendError(Request::Request(_, msg, _))) => {
+                Err(Error::send_closed(msg))
+            }
+            _ => unimplemented!(),
+        }
+    }
+}
+
+impl<M, R, E> ReciveTypedReceiver<R, E> for SynchronizedSync<M, R, E>
+where
+    M: Message,
+    R: Message,
+    E: StdSyncSendError,
+{
+    type Stream = Pin<Box<dyn Stream<Item = Event<R, E>> + Send>>;
+
+    fn event_stream(&self, _: Bus) -> Self::Stream {
+        let mut rx = self.srx.lock().take().unwrap();
+
+        Box::pin(futures::stream::poll_fn(move |cx| rx.poll_recv(cx)))
     }
 }

src/relay.rs

@@ -0,0 +1,320 @@
+use crate::{
+    error::Error,
+    receiver::{
+        Action, AnyReceiver, AnyWrapperRef, BusPollerCallback, PermitDrop, ReceiverTrait,
+        SendUntypedReceiver, TypeTagAccept,
+    },
+    stats::Stats,
+    Bus, Event, Message, Permit, ReciveUntypedReceiver, TypeTag, TypeTagAcceptItem,
+};
+use core::sync::atomic::{AtomicBool, AtomicU64, Ordering};
+use dashmap::DashMap;
+use futures::{pin_mut, StreamExt};
+use std::sync::Arc;
+use tokio::sync::{oneshot, Notify};
+
+pub trait Relay: TypeTagAccept + SendUntypedReceiver + ReciveUntypedReceiver + 'static {}
+impl<T: TypeTagAccept + SendUntypedReceiver + ReciveUntypedReceiver + 'static> Relay for T {}
+
+struct SlabCfg;
+impl sharded_slab::Config for SlabCfg {
+    const RESERVED_BITS: usize = 1;
+}
+
+type Slab<T> = sharded_slab::Slab<T, SlabCfg>;
+
+pub(crate) struct RelayContext {
+    receivers: DashMap<TypeTag, Arc<RelayReceiverContext>>,
+    need_flush: AtomicBool,
+    ready_flag: AtomicBool,
+    idling_flag: AtomicBool,
+    init_sent: AtomicBool,
+    flushed: Notify,
+    synchronized: Notify,
+    closed: Notify,
+    ready: Notify,
+    idle: Notify,
+}
+
+pub struct RelayReceiverContext {
+    limit: u64,
+    processing: AtomicU64,
+    response: Arc<Notify>,
+}
+
+impl RelayReceiverContext {
+    fn new(limit: u64) -> Self {
+        Self {
+            limit,
+            processing: Default::default(),
+            response: Arc::new(Notify::new()),
+        }
+    }
+}
+
+impl PermitDrop for RelayReceiverContext {
+    fn permit_drop(&self) {
+        self.processing.fetch_sub(1, Ordering::SeqCst);
+    }
+}
+
+pub(crate) struct RelayWrapper<S>
+where
+    S: 'static,
+{
+    id: u64,
+    inner: S,
+    context: Arc<RelayContext>,
+    waiters: Slab<oneshot::Sender<Result<Box<dyn Message>, Error>>>,
+}
+impl<S> RelayWrapper<S> {
+    pub fn new(id: u64, inner: S) -> Self {
+        Self {
+            id,
+            inner,
+            context: Arc::new(RelayContext {
+                receivers: DashMap::new(),
+                need_flush: AtomicBool::new(false),
+                ready_flag: AtomicBool::new(false),
+                idling_flag: AtomicBool::new(true),
+                init_sent: AtomicBool::new(false),
+                flushed: Notify::new(),
+                synchronized: Notify::new(),
+                closed: Notify::new(),
+                ready: Notify::new(),
+                idle: Notify::new(),
+            }),
+            waiters: sharded_slab::Slab::new_with_config::<SlabCfg>(),
+        }
+    }
+}
+
+impl<S> TypeTagAccept for RelayWrapper<S>
+where
+    S: Relay + Send + Sync + 'static,
+{
+    fn iter_types(&self) -> Box<dyn Iterator<Item = TypeTagAcceptItem> + '_> {
+        self.inner.iter_types()
+    }
+
+    fn accept_msg(&self, msg: &TypeTag) -> bool {
+        self.inner.accept_msg(msg)
+    }
+
+    fn accept_req(&self, req: &TypeTag, resp: Option<&TypeTag>, err: Option<&TypeTag>) -> bool {
+        self.inner.accept_req(req, resp, err)
+    }
+}
+
+impl<S> ReceiverTrait for RelayWrapper<S>
+where
+    S: Relay + Send + Sync + 'static,
+{
+    fn name(&self) -> &str {
+        std::any::type_name::<Self>()
+    }
+
+    fn typed(&self) -> Option<AnyReceiver<'_>> {
+        None
+    }
+
+    fn wrapper(&self) -> Option<AnyWrapperRef<'_>> {
+        None
+    }
+    fn id(&self) -> u64 {
+        self.id
+    }
+
+    fn send_boxed(
+        &self,
+        mid: u64,
+        boxed_msg: Box<dyn Message>,
+        req: bool,
+        bus: &Bus,
+    ) -> Result<(), Error<Box<dyn Message>>> {
+        self.inner.send_msg(mid, boxed_msg, req, bus)
+    }
+
+    fn add_response_listener(
+        &self,
+        listener: oneshot::Sender<Result<Box<dyn Message>, Error>>,
+    ) -> Result<u64, Error> {
+        Ok(self
+            .waiters
+            .insert(listener)
+            .ok_or(Error::AddListenerError)? as _)
+    }
+
+    fn stats(&self) -> Stats {
+        unimplemented!()
+    }
+
+    fn send_action(&self, bus: &Bus, action: Action) -> Result<(), Error<Action>> {
+        SendUntypedReceiver::send(&self.inner, action, bus)
+    }
+
+    fn close_notify(&self) -> &Notify {
+        &self.context.closed
+    }
+
+    fn sync_notify(&self) -> &Notify {
+        &self.context.synchronized
+    }
+
+    fn flush_notify(&self) -> &Notify {
+        &self.context.flushed
+    }
+
+    fn ready_notify(&self) -> &Notify {
+        &self.context.ready
+    }
+
+    fn idle_notify(&self) -> &Notify {
+        &self.context.idle
+    }
+
+    fn is_init_sent(&self) -> bool {
+        self.context.init_sent.load(Ordering::SeqCst)
+    }
+
+    fn is_ready(&self) -> bool {
+        self.context.ready_flag.load(Ordering::SeqCst)
+    }
+
+    fn is_idling(&self) -> bool {
+        self.context.idling_flag.load(Ordering::SeqCst)
+    }
+
+    fn need_flush(&self) -> bool {
+        self.context.need_flush.load(Ordering::SeqCst)
+    }
+
+    fn set_need_flush(&self) {
+        self.context.need_flush.store(true, Ordering::SeqCst);
+    }
+
+    fn try_reserve(&self, tt: &TypeTag) -> Option<Permit> {
+        if !self.context.receivers.contains_key(tt) {
+            self.context
+                .receivers
+                .insert(tt.clone(), Arc::new(RelayReceiverContext::new(16)));
+        }
+
+        loop {
+            let context = self.context.receivers.get(tt).unwrap();
+            let count = context.processing.load(Ordering::Relaxed);
+
+            if count < context.limit {
+                let res = context.processing.compare_exchange(
+                    count,
+                    count + 1,
+                    Ordering::SeqCst,
+                    Ordering::SeqCst,
+                );
+                if res.is_ok() {
+                    break Some(Permit {
+                        fuse: false,
+                        inner: context.clone(),
+                    });
+                }
+
+                // continue
+            } else {
+                break None;
+            }
+        }
+    }
+
+    fn reserve_notify(&self, tt: &TypeTag) -> Arc<Notify> {
+        if !self.context.receivers.contains_key(tt) {
+            self.context
+                .receivers
+                .insert(tt.clone(), Arc::new(RelayReceiverContext::new(16)));
+        }
+
+        self.context.receivers.get(tt).unwrap().response.clone()
+    }
+
+    fn increment_processing(&self, tt: &TypeTag) {
+        self.context
+            .receivers
+            .get(tt)
+            .map(|r| r.processing.fetch_add(1, Ordering::SeqCst));
+    }
+
+    fn start_polling(self: Arc<Self>) -> BusPollerCallback {
+        Box::new(move |bus| {
+            Box::pin(async move {
+                let this = self.clone();
+                let events = this.inner.event_stream(bus);
+                pin_mut!(events);
+
+                loop {
+                    let event = if let Some(event) = events.next().await {
+                        event
+                    } else {
+                        self.context.closed.notify_waiters();
+                        break;
+                    };
+
+                    match event {
+                        Event::Error(err) => error!("Batch Error: {}", err),
+                        Event::Pause => self.context.ready_flag.store(false, Ordering::SeqCst),
+                        Event::Ready => {
+                            self.context.ready.notify_waiters();
+                            self.context.ready_flag.store(true, Ordering::SeqCst)
+                        }
+                        Event::InitFailed(err) => {
+                            error!("Relay init failed: {}", err);
+
+                            self.context.ready.notify_waiters();
+                            self.context.ready_flag.store(false, Ordering::SeqCst);
+                        }
+                        Event::Exited => {
+                            self.context.closed.notify_waiters();
+                            break;
+                        }
+                        Event::Flushed => {
+                            self.context.need_flush.store(false, Ordering::SeqCst);
+                            self.context.flushed.notify_one()
+                        }
+                        Event::Synchronized(_res) => self.context.synchronized.notify_waiters(),
+                        Event::Response(mid, resp) => {
+                            let tt = if let Ok(bm) = &resp {
+                                Some(bm.type_tag())
+                            } else {
+                                None
+                            };
+
+                            if let Some(chan) = self.waiters.take(mid as _) {
+                                if let Err(err) = chan.send(resp) {
+                                    error!("Response error for mid({}): {:?}", mid, err);
+                                }
+                            } else {
+                                warn!("No waiters for mid({})", mid);
+                            };
+
+                            if let Some(tt) = tt {
+                                if let Some(ctx) = self.context.receivers.get(&tt) {
+                                    ctx.processing.fetch_sub(1, Ordering::SeqCst);
+                                    ctx.response.notify_one();
+                                }
+                            }
+                        }
+
+                        Event::BatchComplete(tt, n) => {
+                            if let Some(ctx) = self.context.receivers.get(&tt) {
+                                ctx.processing.fetch_sub(n, Ordering::SeqCst);
+
+                                for _ in 0..n {
+                                    ctx.response.notify_one();
+                                }
+                            }
+                        }
+                        _ => unimplemented!(),
+                    }
+                }
+            })
+        })
+    }
+}

src/stats.rs

@@ -0,0 +1,21 @@
+use std::borrow::Cow;
+
+#[derive(Default, Debug, Clone)]
+pub struct Stats {
+    pub msg_type_tag: Cow<'static, str>,
+
+    pub resp_type_tag: Option<Cow<'static, str>>,
+    pub err_type_tag: Option<Cow<'static, str>>,
+
+    pub has_queue: bool,
+    pub queue_capacity: i64,
+    pub queue_size: i64,
+
+    pub has_parallel: bool,
+    pub parallel_capacity: i64,
+    pub parallel_size: i64,
+
+    pub has_batch: bool,
+    pub batch_capacity: i64,
+    pub batch_size: i64,
+}

src/type_tag.rs

@@ -0,0 +1,84 @@
+use parking_lot::RwLock;
+use std::collections::HashMap;
+
+use crate::envelop::IntoSharedMessage;
+use crate::error::Error;
+use crate::{Message, SharedMessage, TypeTag};
+
+static TYPE_REGISTRY: TypeRegistry = TypeRegistry::new();
+
+type MessageDeserializerCallback = Box<
+    dyn Fn(&mut dyn erased_serde::Deserializer<'_>) -> Result<Box<dyn SharedMessage>, Error>
+        + Send
+        + Sync,
+>;
+
+pub struct MessageTypeDescriptor {
+    de: MessageDeserializerCallback,
+}
+
+impl MessageTypeDescriptor {
+    #[inline]
+    pub fn deserialize_boxed(
+        &self,
+        de: &mut dyn erased_serde::Deserializer<'_>,
+    ) -> Result<Box<dyn SharedMessage>, Error> {
+        (self.de)(de)
+    }
+}
+
+#[derive(Default)]
+pub struct TypeRegistry {
+    message_types: RwLock<Option<HashMap<TypeTag, MessageTypeDescriptor>>>,
+}
+
+impl TypeRegistry {
+    pub const fn new() -> Self {
+        Self {
+            message_types: parking_lot::const_rwlock(None),
+        }
+    }
+
+    pub fn deserialize(
+        &self,
+        tt: TypeTag,
+        de: &mut dyn erased_serde::Deserializer<'_>,
+    ) -> Result<Box<dyn SharedMessage>, Error<Box<dyn Message>>> {
+        let guard = self.message_types.read();
+        let md = guard
+            .as_ref()
+            .ok_or_else(|| Error::TypeTagNotRegistered(tt.clone()))?
+            .get(&tt)
+            .ok_or(Error::TypeTagNotRegistered(tt))?;
+
+        md.deserialize_boxed(de)
+            .map_err(|err| err.specify::<Box<dyn Message>>())
+    }
+
+    pub fn register<M: Message + serde::Serialize + serde::de::DeserializeOwned>(&self) {
+        println!("insert {}", M::type_tag_());
+
+        self.message_types
+            .write()
+            .get_or_insert_with(HashMap::new)
+            .insert(
+                M::type_tag_(),
+                MessageTypeDescriptor {
+                    de: Box::new(move |de| Ok(M::deserialize(de)?.into_shared())),
+                },
+            );
+    }
+}
+
+#[inline]
+pub fn deserialize_shared_message(
+    tt: TypeTag,
+    de: &mut dyn erased_serde::Deserializer<'_>,
+) -> Result<Box<dyn SharedMessage>, Error<Box<dyn Message>>> {
+    TYPE_REGISTRY.deserialize(tt, de)
+}
+
+#[inline]
+pub fn register_shared_message<M: Message + serde::Serialize + serde::de::DeserializeOwned>() {
+    TYPE_REGISTRY.register::<M>();
+}

src/utils.rs

@@ -1,33 +0,0 @@
-use core::cmp::{Ord, Ordering};
-use core::ops::Range;
-
-pub fn binary_search_range_by_key<'a, T, B, F>(data: &'a [T], item: &B, mut f: F) -> Range<usize>
-where
-    F: FnMut(&'a T) -> B,
-    B: Ord,
-{
-    if let Ok(index) = data.binary_search_by_key(item, &mut f) {
-        let mut begin = index;
-        let mut end = index + 1;
-
-        for i in (0..index).rev() {
-            if f(unsafe { data.get_unchecked(i) }).cmp(item) != Ordering::Equal {
-                break;
-            }
-
-            begin = i;
-        }
-
-        for i in end..data.len() {
-            end = i;
-
-            if f(unsafe { data.get_unchecked(i) }).cmp(item) != Ordering::Equal {
-                break;
-            }
-        }
-
-        begin..end
-    } else {
-        data.len()..data.len()
-    }
-}

tests/test_backpressure.rs

@@ -0,0 +1,58 @@
+use async_trait::async_trait;
+use messagebus::{
+    derive::{Error as MbError, Message},
+    error, receivers, AsyncHandler, Bus, Message,
+};
+use thiserror::Error;
+
+#[derive(Debug, Error, MbError)]
+enum Error {
+    #[error("Error({0})")]
+    Error(anyhow::Error),
+}
+
+impl<M: Message> From<error::Error<M>> for Error {
+    fn from(err: error::Error<M>) -> Self {
+        Self::Error(err.into())
+    }
+}
+
+#[derive(Debug, Clone, Message)]
+struct MsgF32(pub f32);
+
+struct TmpReceiver;
+
+#[async_trait]
+impl AsyncHandler<MsgF32> for TmpReceiver {
+    type Error = Error;
+    type Response = ();
+
+    async fn handle(&self, _msg: MsgF32, _bus: &Bus) -> Result<Self::Response, Self::Error> {
+        std::thread::sleep(std::time::Duration::from_millis(100));
+        Ok(())
+    }
+}
+
+#[tokio::test]
+async fn test_backpressure() {
+    let (b, poller) = Bus::build()
+        .register(TmpReceiver)
+        .subscribe_async::<MsgF32>(
+            1,
+            receivers::BufferUnorderedConfig {
+                buffer_size: 1,
+                max_parallel: 1,
+            },
+        )
+        .done()
+        .build();
+
+    b.send(MsgF32(32f32)).await.unwrap();
+    b.send(MsgF32(32f32)).await.unwrap();
+
+    assert!(b.try_send(MsgF32(32f32)).is_err());
+
+    b.flush_all().await;
+    b.close().await;
+    poller.await;
+}

tests/test_batch.rs

@@ -0,0 +1,115 @@
+use std::sync::Arc;
+
+use async_trait::async_trait;
+use messagebus::{
+    derive::{Error as MbError, Message},
+    error,
+    receivers::BufferUnorderedBatchedConfig,
+    AsyncBatchHandler, Bus, Message,
+};
+use parking_lot::Mutex;
+use thiserror::Error;
+
+#[derive(Debug, Error, Clone, MbError)]
+enum Error {
+    #[error("Error({0})")]
+    Error(Arc<anyhow::Error>),
+}
+
+impl<M: Message> From<error::Error<M>> for Error {
+    fn from(err: error::Error<M>) -> Self {
+        Self::Error(Arc::new(err.into()))
+    }
+}
+
+#[derive(Debug, Clone, Message)]
+#[message(clone)]
+struct MsgI32(i32);
+
+#[derive(Debug, Clone, Message)]
+#[message(clone)]
+struct MsgI16(i16);
+
+struct TmpReceiver {
+    batches: Arc<Mutex<Vec<Vec<i32>>>>,
+}
+
+#[async_trait]
+impl AsyncBatchHandler<MsgI32> for TmpReceiver {
+    type Error = Error;
+    type Response = ();
+    type InBatch = Vec<MsgI32>;
+    type OutBatch = Vec<()>;
+
+    async fn handle(
+        &self,
+        msg: Vec<MsgI32>,
+        _bus: &Bus,
+    ) -> Result<Vec<Self::Response>, Self::Error> {
+        self.batches
+            .lock()
+            .push(msg.into_iter().map(|x| x.0).collect());
+
+        Ok(vec![])
+    }
+}
+
+#[tokio::test]
+async fn test_batch() {
+    let batches = Arc::new(Mutex::new(Vec::new()));
+
+    let (b, poller) = Bus::build()
+        .register(TmpReceiver {
+            batches: batches.clone(),
+        })
+        .subscribe_batch_async::<MsgI32>(
+            16,
+            BufferUnorderedBatchedConfig {
+                batch_size: 8,
+                ..Default::default()
+            },
+        )
+        .done()
+        .build();
+
+    for i in 1..100i32 {
+        b.send(MsgI32(i)).await.unwrap();
+    }
+
+    let mut re = Vec::new();
+    let mut counter = 1i32;
+    for _ in 1..100i32 {
+        let mut v = Vec::new();
+        for _ in 0..8 {
+            if counter >= 100 {
+                break;
+            }
+
+            v.push(counter);
+
+            counter += 1;
+        }
+
+        re.push(v);
+
+        if counter >= 100 {
+            break;
+        }
+    }
+
+    println!("flush");
+    b.flush_all().await;
+
+    let mut lock = batches.lock();
+    lock.sort_by(|a, b| a[0].cmp(&b[0]));
+
+    assert_eq!(lock.as_slice(), re.as_slice());
+
+    println!("close");
+    b.close().await;
+
+    println!("closed");
+
+    poller.await;
+    println!("[done]");
+}

tests/test_concurrency.rs

@@ -0,0 +1,133 @@
+use std::{sync::atomic::AtomicU32, time::Duration};
+
+use async_trait::async_trait;
+use messagebus::{
+    derive::{Error as MbError, Message},
+    error,
+    receivers::BufferUnorderedConfig,
+    AsyncHandler, Bus, Message, Module,
+};
+use thiserror::Error;
+
+#[derive(Debug, Error, MbError)]
+enum Error {
+    #[error("Error({0})")]
+    Error(anyhow::Error),
+
+    #[error("MyError")]
+    MyError,
+}
+
+impl<M: Message> From<error::Error<M>> for Error {
+    fn from(err: error::Error<M>) -> Self {
+        Self::Error(err.into())
+    }
+}
+
+#[derive(Debug, Clone, Message)]
+struct Req(pub u32);
+
+#[derive(Debug, Clone, Message)]
+struct Resp(pub u32);
+
+#[derive(Debug, Clone, Message)]
+struct GetCount;
+
+#[derive(Debug, Clone, Message)]
+struct CountResult(pub u32);
+
+struct TmpReceiver {
+    counter: AtomicU32,
+}
+
+#[async_trait]
+impl AsyncHandler<Req> for TmpReceiver {
+    type Error = Error;
+    type Response = ();
+
+    async fn handle(&self, msg: Req, bus: &Bus) -> Result<Self::Response, Self::Error> {
+        tokio::time::sleep(Duration::from_millis((msg.0 % 20) as _)).await;
+
+        if msg.0 % 128 == 0 {
+            return Err(Error::MyError);
+        } else {
+            bus.send(Resp(msg.0)).await?;
+        }
+
+        Ok(())
+    }
+}
+
+#[async_trait]
+impl AsyncHandler<Resp> for TmpReceiver {
+    type Error = Error;
+    type Response = ();
+
+    async fn handle(&self, _msg: Resp, _bus: &Bus) -> Result<Self::Response, Self::Error> {
+        self.counter
+            .fetch_add(1, std::sync::atomic::Ordering::SeqCst);
+        Ok(())
+    }
+}
+
+#[async_trait]
+impl AsyncHandler<GetCount> for TmpReceiver {
+    type Error = Error;
+    type Response = CountResult;
+
+    async fn handle(&self, _: GetCount, _bus: &Bus) -> Result<Self::Response, Self::Error> {
+        Ok(CountResult(
+            self.counter.load(std::sync::atomic::Ordering::SeqCst),
+        ))
+    }
+}
+
+fn module() -> Module {
+    Module::new()
+        .register(TmpReceiver {
+            counter: AtomicU32::new(0),
+        })
+        .subscribe_async::<Req>(
+            1024,
+            BufferUnorderedConfig {
+                buffer_size: 1024,
+                max_parallel: 1024,
+            },
+        )
+        .subscribe_async::<Resp>(1024, Default::default())
+        .subscribe_async::<GetCount>(8, Default::default())
+        .done()
+}
+
+#[tokio::test]
+async fn test_sync() {
+    let (b, poller) = Bus::build().add_module(module()).build();
+    let cnt = 4u32;
+    for i in 0..cnt {
+        for j in 0..32768 {
+            b.send(Req(i * 128 + j)).await.unwrap();
+        }
+
+        println!("{} sent", i);
+    }
+
+    println!("sent");
+
+    b.flush_all().await;
+
+    println!("flushed");
+
+    assert_eq!(
+        b.request_we::<_, CountResult, Error>(GetCount, Default::default())
+            .await
+            .unwrap()
+            .0,
+        cnt * 32768 - cnt * 256
+    );
+
+    b.close().await;
+
+    println!("closed");
+
+    poller.await;
+}

tests/test_derive.rs

@@ -0,0 +1,32 @@
+use messagebus::{
+    derive::{Error as MbError, Message},
+    error, Message, TypeTagged,
+};
+use thiserror::Error;
+
+#[derive(Debug, Error, MbError)]
+enum Error {
+    #[error("Error({0})")]
+    Error(anyhow::Error),
+}
+
+impl<M: Message> From<error::Error<M>> for Error {
+    fn from(err: error::Error<M>) -> Self {
+        Self::Error(err.into())
+    }
+}
+
+#[derive(Debug, Clone, Message)]
+#[namespace("api")]
+pub struct Msg<F>(pub F);
+
+#[derive(Debug, Clone, Message)]
+#[type_tag("api::Query")]
+pub struct Qqq<F, G, H>(pub F, pub G, pub H);
+
+fn main() {
+    assert_eq!(
+        Qqq::<Msg<i32>, Msg<()>, u64>::type_tag_(),
+        "api::Query<api::Msg<i32>,api::Msg<()>,u64>"
+    );
+}

tests/test_idle.rs

@@ -0,0 +1,71 @@
+use async_trait::async_trait;
+use messagebus::{
+    derive::{Error as MbError, Message},
+    error, receivers, AsyncHandler, Bus, Message,
+};
+use thiserror::Error;
+
+#[derive(Debug, Error, MbError)]
+enum Error {
+    #[error("Error({0})")]
+    Error(anyhow::Error),
+}
+
+impl<M: Message> From<error::Error<M>> for Error {
+    fn from(err: error::Error<M>) -> Self {
+        Self::Error(err.into())
+    }
+}
+
+#[derive(Debug, Clone, Message)]
+struct MsgF32(pub f32);
+
+#[derive(Debug, Clone, Message)]
+struct MsgF64(pub f64);
+
+struct TmpReceiver;
+
+#[async_trait]
+impl AsyncHandler<MsgF64> for TmpReceiver {
+    type Error = Error;
+    type Response = ();
+
+    async fn handle(&self, _msg: MsgF64, _bus: &Bus) -> Result<Self::Response, Self::Error> {
+        std::thread::sleep(std::time::Duration::from_millis(100));
+
+        Ok(())
+    }
+}
+#[async_trait]
+impl AsyncHandler<MsgF32> for TmpReceiver {
+    type Error = Error;
+    type Response = ();
+
+    async fn handle(&self, _msg: MsgF32, bus: &Bus) -> Result<Self::Response, Self::Error> {
+        bus.send(MsgF64(12.0)).await.unwrap();
+        bus.flush::<MsgF64>().await;
+
+        Ok(())
+    }
+}
+
+#[tokio::test]
+async fn test_backpressure() {
+    let (b, poller) = Bus::build()
+        .register(TmpReceiver)
+        .subscribe_async::<MsgF32>(
+            1,
+            receivers::BufferUnorderedConfig {
+                buffer_size: 1,
+                max_parallel: 1,
+            },
+        )
+        .done()
+        .build();
+
+    b.send(MsgF32(10.0)).await.unwrap();
+    // b.idle_all().await;
+    b.flush_all().await;
+    b.close().await;
+    poller.await;
+}

tests/test_relay.rs

@@ -0,0 +1,204 @@
+use std::pin::Pin;
+
+use async_trait::async_trait;
+use futures::Stream;
+use messagebus::{
+    derive::{Error as MbError, Message},
+    error::{self, GenericError},
+    receivers, Action, AsyncHandler, Bus, Event, Message, MessageBounds, ReciveUntypedReceiver,
+    SendUntypedReceiver, TypeTagAccept, TypeTagAcceptItem, TypeTagged,
+};
+use parking_lot::Mutex;
+use thiserror::Error;
+use tokio::sync::mpsc;
+
+#[derive(Debug, Error, MbError)]
+enum Error {
+    #[error("Error({0})")]
+    Error(anyhow::Error),
+}
+
+impl<M: Message> From<error::Error<M>> for Error {
+    fn from(err: error::Error<M>) -> Self {
+        Self::Error(err.into())
+    }
+}
+
+#[derive(Debug, Clone, Message)]
+pub struct Msg<F: MessageBounds + Clone>(pub F);
+
+struct TmpReceiver;
+
+#[async_trait]
+impl AsyncHandler<Msg<i32>> for TmpReceiver {
+    type Error = Error;
+    type Response = ();
+
+    async fn handle(&self, msg: Msg<i32>, _bus: &Bus) -> Result<Self::Response, Self::Error> {
+        println!("TmpReceiver::handle {:?}", msg);
+        Ok(())
+    }
+
+    async fn sync(&self, _bus: &Bus) -> Result<(), Self::Error> {
+        println!("TmpReceiver::sync");
+        Ok(())
+    }
+}
+
+pub type TestRelayRxChannelCell =
+    Mutex<Option<mpsc::UnboundedReceiver<Event<Box<dyn Message>, GenericError>>>>;
+pub type TestRelayRxStream =
+    Pin<Box<dyn Stream<Item = Event<Box<dyn Message>, error::GenericError>> + Send>>;
+
+pub struct TestRelay {
+    stx: mpsc::UnboundedSender<Event<Box<dyn Message>, GenericError>>,
+    srx: TestRelayRxChannelCell,
+}
+
+impl TypeTagAccept for TestRelay {
+    fn accept_req(
+        &self,
+        msg: &messagebus::TypeTag,
+        resp: Option<&messagebus::TypeTag>,
+        _err: Option<&messagebus::TypeTag>,
+    ) -> bool {
+        if msg.as_ref() == Msg::<i16>::type_tag_().as_ref() {
+            if let Some(resp) = resp {
+                if resp.as_ref() == Msg::<u8>::type_tag_().as_ref() {
+                    return true;
+                }
+            } else {
+                return true;
+            }
+        }
+
+        if msg.as_ref() == Msg::<i32>::type_tag_().as_ref() {
+            if let Some(resp) = resp {
+                if resp.as_ref() == Msg::<u64>::type_tag_().as_ref() {
+                    return true;
+                }
+            } else {
+                return true;
+            }
+        }
+
+        false
+    }
+
+    fn accept_msg(&self, msg: &messagebus::TypeTag) -> bool {
+        if msg.as_ref() == Msg::<i32>::type_tag_().as_ref() {
+            return true;
+        }
+
+        false
+    }
+
+    fn iter_types(&self) -> Box<dyn Iterator<Item = TypeTagAcceptItem>> {
+        Box::new(
+            std::iter::once((Msg::<i32>::type_tag_(), None))
+                .chain(std::iter::once((
+                    Msg::<i32>::type_tag_(),
+                    Some((Msg::<u64>::type_tag_(), GenericError::type_tag_())),
+                )))
+                .chain(std::iter::once((
+                    Msg::<i16>::type_tag_(),
+                    Some((Msg::<u8>::type_tag_(), GenericError::type_tag_())),
+                ))),
+        )
+    }
+}
+
+impl SendUntypedReceiver for TestRelay {
+    fn send(&self, msg: Action, _bus: &Bus) -> Result<(), error::Error<Action>> {
+        match msg {
+            Action::Init(..) => {
+                self.stx.send(Event::Ready).unwrap();
+            }
+            Action::Close => {
+                self.stx.send(Event::Exited).unwrap();
+            }
+            Action::Flush => {
+                self.stx.send(Event::Flushed).unwrap();
+            }
+            Action::Sync => {
+                self.stx.send(Event::Synchronized(Ok(()))).unwrap();
+            }
+            _ => unimplemented!(),
+        }
+
+        println!("TestRelay::send {:?}", msg);
+        Ok(())
+    }
+
+    fn send_msg(
+        &self,
+        mid: u64,
+        msg: Box<dyn Message>,
+        req: bool,
+        _bus: &Bus,
+    ) -> Result<(), error::Error<Box<dyn Message>>> {
+        println!("TestRelay::send_msg [{}] {:?}", mid, msg);
+        if msg.type_tag().as_ref() == Msg::<i16>::type_tag_().as_ref() {
+            self.stx
+                .send(Event::Response(mid, Ok(Box::new(Msg(9u8)))))
+                .unwrap();
+        } else if msg.type_tag().as_ref() == Msg::<i32>::type_tag_().as_ref() {
+            if req {
+                self.stx
+                    .send(Event::Response(mid, Ok(Box::new(Msg(22u64)))))
+                    .unwrap();
+            } else {
+                self.stx
+                    .send(Event::Response(mid, Ok(Box::new(()))))
+                    .unwrap();
+            }
+        } else {
+            panic!("unsupported message type {}", msg.type_tag());
+        }
+
+        Ok(())
+    }
+}
+
+impl ReciveUntypedReceiver for TestRelay {
+    type Stream = TestRelayRxStream;
+
+    fn event_stream(&self, _: Bus) -> Self::Stream {
+        let mut rx = self.srx.lock().take().unwrap();
+
+        Box::pin(futures::stream::poll_fn(move |cx| rx.poll_recv(cx)))
+    }
+}
+
+#[tokio::test]
+async fn test_relay() {
+    let (stx, srx) = mpsc::unbounded_channel();
+    let relay = TestRelay {
+        stx,
+        srx: Mutex::new(Some(srx)),
+    };
+
+    let (b, poller) = Bus::build()
+        .register_relay(relay)
+        .register(TmpReceiver)
+        .subscribe_async::<Msg<i32>>(
+            1,
+            receivers::BufferUnorderedConfig {
+                buffer_size: 1,
+                max_parallel: 1,
+            },
+        )
+        .done()
+        .build();
+
+    b.send(Msg(32i32)).await.unwrap();
+    let res1: Msg<u8> = b.request(Msg(12i16), Default::default()).await.unwrap();
+    let res2: Msg<u64> = b.request(Msg(12i32), Default::default()).await.unwrap();
+
+    assert_eq!(res1.0, 9u8);
+    assert_eq!(res2.0, 22u64);
+
+    b.flush_all().await;
+    b.close().await;
+    poller.await;
+}

tests/test_req_resp.rs

@@ -0,0 +1,246 @@
+use core::f32;
+
+use async_trait::async_trait;
+use messagebus::{
+    derive::Message,
+    error::{self, StdSyncSendError},
+    AsyncHandler, Bus, Message,
+};
+use thiserror::Error;
+
+#[derive(Debug, Error, messagebus::derive::Error)]
+enum Error {
+    #[error("Error({0})")]
+    Error(anyhow::Error),
+}
+
+impl<M: Message, E: StdSyncSendError> From<error::Error<M, E>> for Error {
+    fn from(err: error::Error<M, E>) -> Self {
+        Self::Error(err.into())
+    }
+}
+
+#[derive(Debug, Clone, Message)]
+#[message(clone)]
+struct MsgF64(pub f64);
+
+#[derive(Debug, Clone, Message)]
+#[message(clone)]
+struct MsgF32(pub f32);
+
+#[derive(Debug, Clone, Message)]
+#[message(clone)]
+struct MsgI32(pub i32);
+
+#[derive(Debug, Clone, Message)]
+#[message(clone)]
+struct MsgU32(pub u32);
+
+#[derive(Debug, Clone, Message)]
+#[message(clone)]
+struct MsgU16(pub u16);
+
+#[derive(Debug, Clone, Message)]
+#[message(clone)]
+struct MsgI16(pub i16);
+
+#[derive(Debug, Clone, Message)]
+#[message(clone)]
+struct MsgU8(pub u8);
+
+#[derive(Debug, Clone, Message)]
+#[message(clone)]
+struct MsgI8(pub i8);
+
+struct TmpReceiver1;
+struct TmpReceiver2;
+
+#[async_trait]
+impl AsyncHandler<MsgI32> for TmpReceiver1 {
+    type Error = Error;
+    type Response = MsgF32;
+
+    async fn handle(&self, msg: MsgI32, bus: &Bus) -> Result<Self::Response, Self::Error> {
+        let resp1 = bus
+            .request::<_, MsgF32>(MsgI16(10i16), Default::default())
+            .await?;
+        let resp2 = bus
+            .request::<_, MsgF32>(MsgU16(20u16), Default::default())
+            .await?;
+
+        Ok(MsgF32(msg.0 as f32 + resp1.0 + resp2.0))
+    }
+
+    async fn sync(&self, _bus: &Bus) -> Result<(), Self::Error> {
+        println!("TmpReceiver1 i32: sync");
+
+        Ok(())
+    }
+}
+
+#[async_trait]
+impl AsyncHandler<MsgU32> for TmpReceiver1 {
+    type Error = Error;
+    type Response = MsgF32;
+
+    async fn handle(&self, msg: MsgU32, _bus: &Bus) -> Result<Self::Response, Self::Error> {
+        Ok(MsgF32(msg.0 as _))
+    }
+    async fn sync(&self, _bus: &Bus) -> Result<(), Self::Error> {
+        println!("TmpReceiver1 u32: sync");
+
+        Ok(())
+    }
+}
+
+#[async_trait]
+impl AsyncHandler<MsgI16> for TmpReceiver1 {
+    type Error = Error;
+    type Response = MsgF32;
+
+    async fn handle(&self, msg: MsgI16, bus: &Bus) -> Result<Self::Response, Self::Error> {
+        let resp1 = bus
+            .request::<_, MsgF32>(MsgI8(1i8), Default::default())
+            .await?;
+        let resp2 = bus
+            .request::<_, MsgF32>(MsgU8(2u8), Default::default())
+            .await?;
+
+        Ok(MsgF32(msg.0 as f32 + resp1.0 + resp2.0))
+    }
+
+    async fn sync(&self, _bus: &Bus) -> Result<(), Self::Error> {
+        println!("TmpReceiver i16: sync");
+
+        Ok(())
+    }
+}
+
+#[async_trait]
+impl AsyncHandler<MsgU16> for TmpReceiver1 {
+    type Error = Error;
+    type Response = MsgF32;
+
+    async fn handle(&self, msg: MsgU16, _bus: &Bus) -> Result<Self::Response, Self::Error> {
+        Ok(MsgF32(msg.0 as _))
+    }
+
+    async fn sync(&self, _bus: &Bus) -> Result<(), Self::Error> {
+        println!("TmpReceiver i16: sync");
+
+        Ok(())
+    }
+}
+
+#[async_trait]
+impl AsyncHandler<MsgI8> for TmpReceiver1 {
+    type Error = Error;
+    type Response = MsgF32;
+
+    async fn handle(&self, msg: MsgI8, _bus: &Bus) -> Result<Self::Response, Self::Error> {
+        Ok(MsgF32(msg.0 as _))
+    }
+
+    async fn sync(&self, _bus: &Bus) -> Result<(), Self::Error> {
+        println!("TmpReceiver1 i8: sync");
+
+        Ok(())
+    }
+}
+
+#[async_trait]
+impl AsyncHandler<MsgU8> for TmpReceiver1 {
+    type Error = Error;
+    type Response = MsgF32;
+
+    async fn handle(&self, msg: MsgU8, _bus: &Bus) -> Result<Self::Response, Self::Error> {
+        Ok(MsgF32(msg.0 as _))
+    }
+    async fn sync(&self, _bus: &Bus) -> Result<(), Self::Error> {
+        println!("TmpReceiver1 u8: sync");
+
+        Ok(())
+    }
+}
+
+#[async_trait]
+impl AsyncHandler<MsgF64> for TmpReceiver2 {
+    type Error = Error;
+    type Response = MsgF64;
+
+    async fn handle(&self, msg: MsgF64, bus: &Bus) -> Result<Self::Response, Self::Error> {
+        let resp1 = bus
+            .request::<_, MsgF32>(MsgI32(100i32), Default::default())
+            .await?
+            .0 as f64;
+        let resp2 = bus
+            .request::<_, MsgF32>(MsgU32(200u32), Default::default())
+            .await?
+            .0 as f64;
+        let resp3 = bus
+            .request::<_, MsgF32>(MsgF32(300f32), Default::default())
+            .await?
+            .0 as f64;
+
+        Ok(MsgF64(msg.0 + resp1 + resp2 + resp3))
+    }
+
+    async fn sync(&self, _bus: &Bus) -> Result<(), Self::Error> {
+        println!("TmpReceiver1 f64: sync");
+
+        Ok(())
+    }
+}
+
+#[async_trait]
+impl AsyncHandler<MsgF32> for TmpReceiver2 {
+    type Error = Error;
+    type Response = MsgF32;
+
+    async fn handle(&self, msg: MsgF32, _bus: &Bus) -> Result<Self::Response, Self::Error> {
+        Ok(msg)
+    }
+    async fn sync(&self, _bus: &Bus) -> Result<(), Self::Error> {
+        println!("TmpReceiver2: f32: sync");
+
+        Ok(())
+    }
+}
+
+#[tokio::test]
+async fn test() {
+    let (b, poller) = Bus::build()
+        .register(TmpReceiver1)
+        .subscribe_async::<MsgI32>(8, Default::default())
+        .subscribe_async::<MsgU32>(8, Default::default())
+        .subscribe_async::<MsgI16>(8, Default::default())
+        .subscribe_async::<MsgU16>(8, Default::default())
+        .subscribe_async::<MsgI8>(8, Default::default())
+        .subscribe_async::<MsgU8>(8, Default::default())
+        .done()
+        .register(TmpReceiver2)
+        .subscribe_async::<MsgF32>(8, Default::default())
+        .subscribe_async::<MsgF64>(8, Default::default())
+        .done()
+        .build();
+
+    let we_res = b
+        .request_we::<_, MsgF64, Error>(MsgF64(1000f64), Default::default())
+        .await
+        .unwrap();
+
+    assert!((we_res.0 - 1633.0f64).abs() < f64::EPSILON);
+
+    let boxed_res = b
+        .request_boxed(Box::new(MsgF64(1000.)), Default::default())
+        .await
+        .unwrap();
+
+    let val = boxed_res.as_any_ref().downcast_ref::<MsgF64>().unwrap().0;
+
+    assert!((val - 1633.0f64).abs() < f64::EPSILON);
+
+    b.flush_all().await;
+    b.close().await;
+    poller.await;
+}

tests/test_serde.rs

@@ -0,0 +1,85 @@
+use async_trait::async_trait;
+use messagebus::{
+    derive::{Error as MbError, Message},
+    error, AsyncHandler, Bus, Message, TypeTag,
+};
+use serde_derive::{Deserialize, Serialize};
+use thiserror::Error;
+
+#[derive(Debug, Error, MbError)]
+enum Error {
+    #[error("Error({0})")]
+    Error(anyhow::Error),
+}
+
+impl<M: Message> From<error::Error<M>> for Error {
+    fn from(err: error::Error<M>) -> Self {
+        Self::Error(err.into())
+    }
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize, Message)]
+#[message(shared, clone)]
+#[type_tag("Msg")]
+struct Msg {
+    test1: u32,
+    test2: String,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize, Message)]
+#[message(shared, clone)]
+#[type_tag("MsgResponse")]
+struct MsgResponse {
+    test1: u32,
+    test2: String,
+}
+
+struct TmpReceiver;
+
+#[async_trait]
+impl AsyncHandler<Msg> for TmpReceiver {
+    type Error = Error;
+    type Response = MsgResponse;
+
+    async fn handle(&self, msg: Msg, _bus: &Bus) -> Result<Self::Response, Self::Error> {
+        Ok(MsgResponse {
+            test1: msg.test1 * 2,
+            test2: msg.test2 + ", World!",
+        })
+    }
+}
+
+#[tokio::test]
+async fn test() {
+    let (b, poller) = Bus::build()
+        .register(TmpReceiver)
+        .subscribe_async::<Msg>(8, Default::default())
+        .done()
+        .build();
+
+    let type_tag: TypeTag = "Msg".into();
+    let message = br#"{"test1":12,"test2":"Hello"}"#;
+
+    let json = &mut serde_json::Deserializer::from_slice(message);
+    let mut de = <dyn erased_serde::Deserializer>::erase(json);
+
+    let val = b
+        .request_deserialize(type_tag, &mut de, Default::default())
+        .await
+        .unwrap();
+
+    let mut buff: Vec<u8> = Vec::new();
+    let json = &mut serde_json::Serializer::new(&mut buff);
+    let mut ser = <dyn erased_serde::Serializer>::erase(json);
+    val.as_shared_ref()
+        .unwrap()
+        .erased_serialize(&mut ser)
+        .unwrap();
+
+    assert_eq!(val.type_tag(), TypeTag::from("MsgResponse"));
+    assert_eq!(buff.as_slice(), br#"{"test1":24,"test2":"Hello, World!"}"#);
+
+    b.flush_all().await;
+    b.close().await;
+    poller.await;
+}

tests/test_shared.rs

@@ -0,0 +1,91 @@
+use std::sync::{
+    atomic::{AtomicBool, Ordering},
+    Arc,
+};
+
+use async_trait::async_trait;
+use messagebus::{
+    derive::{Error as MbError, Message},
+    error, AsyncHandler, Bus, Message,
+};
+use thiserror::Error;
+
+#[derive(Debug, Error, MbError)]
+enum Error {
+    #[error("Error({0})")]
+    Error(anyhow::Error),
+}
+
+impl<M: Message> From<error::Error<M>> for Error {
+    fn from(err: error::Error<M>) -> Self {
+        Self::Error(err.into())
+    }
+}
+
+#[derive(Debug, Clone, serde_derive::Serialize, serde_derive::Deserialize, Message)]
+#[message(clone, shared)]
+struct Msg;
+
+#[derive(Debug, Clone, serde_derive::Serialize, serde_derive::Deserialize, Message)]
+#[message(clone, shared)]
+struct SharedMsg<T>(T);
+
+struct TmpReceiverContext {
+    sync1: AtomicBool,
+    sync2: AtomicBool,
+}
+
+struct TmpReceiver {
+    ctx: Arc<TmpReceiverContext>,
+}
+
+#[async_trait]
+impl AsyncHandler<SharedMsg<f32>> for TmpReceiver {
+    type Error = Error;
+    type Response = ();
+
+    async fn handle(
+        &self,
+        _msg: SharedMsg<f32>,
+        _bus: &Bus,
+    ) -> Result<Self::Response, Self::Error> {
+        self.ctx.sync1.store(true, Ordering::Relaxed);
+        Ok(())
+    }
+}
+
+#[async_trait]
+impl AsyncHandler<Msg> for TmpReceiver {
+    type Error = Error;
+    type Response = ();
+
+    async fn handle(&self, _msg: Msg, _bus: &Bus) -> Result<Self::Response, Self::Error> {
+        self.ctx.sync2.store(false, Ordering::Relaxed);
+        Ok(())
+    }
+}
+
+#[tokio::test]
+async fn test_shared() {
+    let ctx = Arc::new(TmpReceiverContext {
+        sync1: AtomicBool::new(false),
+        sync2: AtomicBool::new(false),
+    });
+
+    let (b, poller) = Bus::build()
+        .register(TmpReceiver { ctx: ctx.clone() })
+        .subscribe_async::<Msg>(8, Default::default())
+        .subscribe_async::<SharedMsg<f32>>(8, Default::default())
+        .done()
+        .build();
+
+    b.send_one(Msg).await.unwrap();
+    b.send_one(SharedMsg(0.0f32)).await.unwrap();
+
+    b.flush_all().await;
+    b.close().await;
+    poller.await;
+
+    assert!(ctx.sync1.load(Ordering::Relaxed));
+    assert!(!ctx.sync2.load(Ordering::Relaxed));
+}

tests/test_sync.rs

@@ -0,0 +1,85 @@
+use messagebus::{
+    derive::{Error as MbError, Message},
+    error, Bus, Handler, Message, Module,
+};
+use thiserror::Error;
+
+#[derive(Debug, Error, MbError)]
+enum Error {
+    #[error("Error({0})")]
+    Error(anyhow::Error),
+}
+
+impl<M: Message> From<error::Error<M>> for Error {
+    fn from(err: error::Error<M>) -> Self {
+        Self::Error(err.into())
+    }
+}
+
+#[derive(Debug, Clone, Message)]
+struct MsgF32(pub f32);
+
+#[derive(Debug, Clone, Message)]
+struct MsgU32(pub u32);
+
+#[derive(Debug, Clone, Message)]
+struct MsgU16(pub u16);
+
+struct TmpReceiver;
+
+impl Handler<MsgF32> for TmpReceiver {
+    type Error = Error;
+    type Response = ();
+
+    fn handle(&self, msg: MsgF32, _bus: &Bus) -> Result<Self::Response, Self::Error> {
+        println!("---> f32 {:?}", msg);
+
+        std::thread::sleep(std::time::Duration::from_millis(100));
+
+        println!("done");
+
+        Ok(())
+    }
+}
+
+impl Handler<MsgU16> for TmpReceiver {
+    type Error = Error;
+    type Response = ();
+
+    fn handle(&self, msg: MsgU16, _bus: &Bus) -> Result<Self::Response, Self::Error> {
+        println!("---> u16 {:?}", msg);
+        Ok(())
+    }
+}
+
+impl Handler<MsgU32> for TmpReceiver {
+    type Error = Error;
+    type Response = ();
+
+    fn handle(&self, msg: MsgU32, _bus: &Bus) -> Result<Self::Response, Self::Error> {
+        println!("---> u32 {:?}", msg);
+        Ok(())
+    }
+}
+
+fn module() -> Module {
+    Module::new()
+        .register(TmpReceiver)
+        .subscribe_sync::<MsgF32>(8, Default::default())
+        .subscribe_sync::<MsgU16>(8, Default::default())
+        .subscribe_sync::<MsgU32>(8, Default::default())
+        .done()
+}
+
+#[tokio::test]
+async fn test_sync() {
+    let (b, poller) = Bus::build().add_module(module()).build();
+
+    b.send(MsgF32(32f32)).await.unwrap();
+    b.send(MsgU16(11u16)).await.unwrap();
+    b.send(MsgU32(32u32)).await.unwrap();
+
+    b.flush_and_sync_all(false).await;
+    b.close().await;
+    poller.await;
+}