Fix bus performance

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "messagebus"
-version = "0.4.6"
+version = "0.5.2"
 authors = ["Andrey Tkachenko <andrey@aidev.ru>"]
 repository = "https://github.com/andreytkachenko/messagebus.git"
 keywords = ["futures", "async", "tokio", "message", "bus"]
@@ -11,12 +11,12 @@ exclude = [".gitignore", ".cargo/config", ".github/**", "codecov.yml"]
 edition = "2018"
 
 [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"
+tokio = { version = "1", features = ["parking_lot", "rt-multi-thread", "sync"] }
+parking_lot = "0.11"
+async-trait = "0.1"
+futures = "0.3"
+anyhow = "1.0"
 crossbeam = "0.8.0"
 
 [dev-dependencies]
-tokio = { version = "0.2", features = ["parking_lot", "rt-threaded", "sync", "stream", "macros"] }
+tokio = { version = "1", features = ["parking_lot", "rt-multi-thread", "sync", "macros"] }

examples/demo_local.rs

@@ -0,0 +1,41 @@
+use std::rc::Rc;
+use std::cell::Cell;
+use async_trait::async_trait;
+use messagebus::{receivers, Bus, LocalHandler, LocalAsyncHandler, Result as MbusResult};
+
+struct TmpReceiver {
+    _inner: Rc<Cell<i32>>
+}
+
+
+#[async_trait(?Send)]
+impl LocalAsyncHandler<f32> for TmpReceiver {
+    async fn handle(&mut self, msg: f32, bus: &Bus) -> MbusResult {
+        println!("---> f32 {}", msg);
+
+        bus.send(11u16).await.unwrap();
+
+        Ok(())
+    }
+}
+
+impl LocalHandler<u16> for TmpReceiver {
+    fn handle(&mut self, msg: u16, _bus: &Bus) -> MbusResult {
+        println!("---> u16 {}", msg);
+        Ok(())
+    }
+}
+
+#[tokio::main]
+async fn main() {
+    let (b, poller) = Bus::build()
+        .register_local(||TmpReceiver {_inner: Rc::new(Cell::new(12))})
+        .subscribe::<f32, receivers::LocalAsync<_>>(Default::default())
+        .subscribe::<u16, receivers::LocalSync<_>>(Default::default())
+        .done()
+        .build();
+
+    b.send(32f32).await.unwrap();
+
+    poller.await
+}

src/builder.rs

@@ -2,7 +2,6 @@ use std::{any::TypeId, collections::HashMap, marker::PhantomData, pin::Pin, sync
 
 use futures::{Future, FutureExt};
 use receiver::ReceiverTrait;
-use tokio::sync::Mutex;
 
 use crate::{
     receiver::{self, Receiver},
@@ -30,6 +29,8 @@ pub trait ReceiverSubscriberBuilder<M, T: 'static> {
 pub struct SyncEntry;
 pub struct UnsyncEntry;
 
+pub struct LocalEntry;
+
 #[must_use]
 pub struct RegisterEntry<K, T> {
     item: Untyped,
@@ -65,6 +66,27 @@ impl<K, T: 'static> RegisterEntry<K, T> {
     }
 }
 
+
+impl<T: 'static> RegisterEntry<LocalEntry, T> {
+    pub fn subscribe<M, R>(mut self, cfg: R::Config) -> Self
+    where
+        T: 'static,
+        M: Message + 'static,
+        R: ReceiverSubscriberBuilder<M, T> + 'static,
+    {
+        let (inner, poller) = R::build(cfg).subscribe();
+
+        let receiver = Receiver::new(inner);
+        self.receivers
+            .entry(TypeId::of::<M>())
+            .or_insert_with(Vec::new)
+            .push((receiver, poller));
+
+        self
+    }
+}
+
+
 impl<T: Send + 'static> RegisterEntry<UnsyncEntry, T> {
     pub fn subscribe<M, R>(mut self, cfg: R::Config) -> Self
     where
@@ -118,7 +140,7 @@ impl BusBuilder {
 
     pub fn register<T: Send + Sync + 'static>(self, item: T) -> RegisterEntry<SyncEntry, T> {
         RegisterEntry {
-            item: Arc::new(item) as Untyped,
+            item: Untyped::new_readonly(item),
             builder: self,
             receivers: HashMap::new(),
             _m: Default::default(),
@@ -127,7 +149,19 @@ impl BusBuilder {
 
     pub fn register_unsync<T: Send + 'static>(self, item: T) -> RegisterEntry<UnsyncEntry, T> {
         RegisterEntry {
-            item: Arc::new(Mutex::new(item)) as Untyped,
+            item: Untyped::new_mutex(item),
+            builder: self,
+            receivers: HashMap::new(),
+            _m: Default::default(),
+        }
+    }
+
+    pub fn register_local<T: 'static>(
+        self,
+        item: impl FnOnce() -> T + Send + 'static,
+    ) -> RegisterEntry<LocalEntry, T> {
+        RegisterEntry {
+            item: Untyped::new_local(item),
             builder: self,
             receivers: HashMap::new(),
             _m: Default::default(),

src/handler.rs

@@ -62,15 +62,15 @@ pub trait AsyncBatchSynchronizedHandler<M: Message>: Send {
 }
 
 pub trait LocalHandler<M: Message> {
-    fn handle(&mut self, msg: Vec<M>, bus: &Bus) -> anyhow::Result<()>;
+    fn handle(&mut self, msg: M, bus: &Bus) -> anyhow::Result<()>;
     fn sync(&mut self, _bus: &Bus) -> anyhow::Result<()> {
         Ok(())
     }
 }
 
-#[async_trait]
+#[async_trait(?Send)]
 pub trait LocalAsyncHandler<M: Message> {
-    async fn handle(&mut self, msg: Vec<M>, bus: &Bus) -> anyhow::Result<()>;
+    async fn handle(&mut self, msg: M, bus: &Bus) -> anyhow::Result<()>;
     async fn sync(&mut self, _bus: &Bus) -> anyhow::Result<()> {
         Ok(())
     }
@@ -83,7 +83,7 @@ pub trait LocalBatchHandler<M: Message> {
     }
 }
 
-#[async_trait]
+#[async_trait(?Send)]
 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<()> {

src/lib.rs

@@ -5,6 +5,7 @@ pub mod msgs;
 mod receiver;
 pub mod receivers;
 mod trait_object;
+mod untyped;
 mod utils;
 
 use builder::BusBuilder;
@@ -14,13 +15,13 @@ pub use receiver::SendError;
 use receiver::{Receiver, ReceiverStats};
 use utils::binary_search_range_by_key;
 
-use core::any::{Any, TypeId};
+use core::any::TypeId;
 use std::sync::{
     atomic::{AtomicBool, Ordering},
     Arc,
 };
 
-pub type Untyped = Arc<dyn Any + Send + Sync>;
+pub use untyped::Untyped;
 pub type Result = anyhow::Result<()>;
 
 pub struct BusInner {
@@ -58,8 +59,7 @@ impl BusInner {
 
     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(());
+            return Err(SendError::Closed(msg));
         }
 
         let tid = TypeId::of::<M>();
@@ -70,7 +70,7 @@ impl BusInner {
         }
 
         if let Some((_, r)) = self.receivers.get(range.start) {
-            r.try_broadcast(msg.clone())?;
+            r.try_broadcast(msg)?;
         } else {
             println!("Unhandled message {:?}", core::any::type_name::<M>());
         }
@@ -96,7 +96,7 @@ impl BusInner {
         }
 
         if let Some((_, r)) = self.receivers.get(range.start) {
-            r.broadcast(msg.clone()).await?;
+            r.broadcast(msg).await?;
         } else {
             println!("Unhandled message {:?}", core::any::type_name::<M>());
         }

src/receivers/buffer_unordered/async.rs

@@ -77,7 +77,7 @@ async fn buffer_unordered_poller<T, M>(
     T: AsyncHandler<M> + 'static,
     M: Message,
 {
-    let ut = ut.downcast::<T>().unwrap();
+    let ut = ut.downcast_sync::<T>().unwrap();
 
     let mut x = rx
         .map(|msg| {
@@ -86,7 +86,9 @@ async fn buffer_unordered_poller<T, M>(
             let bus = bus.clone();
             let ut = ut.clone();
 
-            tokio::task::spawn(async move { ut.handle(msg, &bus).await })
+            tokio::task::spawn(
+                async move { ut.lock_read().await.get_ref().handle(msg, &bus).await },
+            )
         })
         .buffer_unordered(cfg.max_parallel);
 
@@ -103,7 +105,9 @@ async fn buffer_unordered_poller<T, M>(
 
     let ut = ut.clone();
     let bus_clone = bus.clone();
-    let res = tokio::task::spawn(async move { ut.sync(&bus_clone).await }).await;
+    let res =
+        tokio::task::spawn(async move { ut.lock_read().await.get_ref().sync(&bus_clone).await })
+            .await;
 
     match res {
         Ok(Err(err)) => {

src/receivers/buffer_unordered/sync.rs

@@ -1,5 +1,5 @@
 use crate::{receiver::ReceiverStats, receivers::mpsc};
-use futures::{Future, StreamExt};
+use futures::{executor::block_on, Future, StreamExt};
 use std::{
     any::TypeId,
     marker::PhantomData,
@@ -76,7 +76,7 @@ async fn buffer_unordered_poller<T, M>(
     T: Handler<M> + 'static,
     M: Message,
 {
-    let ut = ut.downcast::<T>().unwrap();
+    let ut = ut.downcast_sync::<T>().unwrap();
 
     let mut x = rx
         .map(|msg| {
@@ -86,7 +86,9 @@ async fn buffer_unordered_poller<T, M>(
             let bus = bus.clone();
             let ut = ut.clone();
 
-            tokio::task::spawn_blocking(move || ut.handle(msg, &bus))
+            tokio::task::spawn_blocking(move || {
+                block_on(ut.lock_read()).get_ref().handle(msg, &bus)
+            })
         })
         .buffer_unordered(cfg.max_parallel);
 
@@ -103,7 +105,9 @@ async fn buffer_unordered_poller<T, M>(
 
     let ut = ut.clone();
     let bus_clone = bus.clone();
-    let res = tokio::task::spawn_blocking(move || ut.sync(&bus_clone)).await;
+    let res =
+        tokio::task::spawn_blocking(move || block_on(ut.lock_read()).get_ref().sync(&bus_clone))
+            .await;
 
     match res {
         Ok(Err(err)) => {
@@ -112,10 +116,7 @@ async fn buffer_unordered_poller<T, M>(
         _ => (),
     }
 
-    println!(
-        "[EXIT] BufferUnorderedSync<{}>",
-        std::any::type_name::<M>()
-    );
+    println!("[EXIT] BufferUnorderedSync<{}>", std::any::type_name::<M>());
 }
 
 pub struct BufferUnorderedSync<M: Message> {

src/receivers/buffer_unordered_batched/async.rs

@@ -79,19 +79,16 @@ async fn buffer_unordered_poller<T, M>(
     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 ut = ut.downcast_sync::<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()
+        rx.ready_chunks(cfg.batch_size).left_stream()
     } else {
-        rx.chunks(cfg.batch_size)
-            .right_stream()
+        rx.chunks(cfg.batch_size).right_stream()
     };
 
     let mut rx = rx
@@ -102,7 +99,13 @@ async fn buffer_unordered_poller<T, M>(
             let bus_clone = bus.clone();
             let ut = ut.clone();
 
-            tokio::task::spawn(async move { ut.handle(msgs, &bus_clone).await })
+            tokio::task::spawn(async move {
+                ut.lock_read()
+                    .await
+                    .get_ref()
+                    .handle(msgs, &bus_clone)
+                    .await
+            })
         })
         .buffer_unordered(cfg.max_parallel);
 
@@ -119,7 +122,9 @@ async fn buffer_unordered_poller<T, M>(
 
     let ut = ut.clone();
     let bus_clone = bus.clone();
-    let res = tokio::task::spawn(async move { ut.sync(&bus_clone).await }).await;
+    let res =
+        tokio::task::spawn(async move { ut.lock_read().await.get_ref().sync(&bus_clone).await })
+            .await;
 
     match res {
         Ok(Err(err)) => {

src/receivers/buffer_unordered_batched/mod.rs

@@ -27,9 +27,9 @@ pub struct BufferUnorderedBatchedConfig {
 impl Default for BufferUnorderedBatchedConfig {
     fn default() -> Self {
         Self {
-            buffer_size:  8,
+            buffer_size: 8,
             max_parallel: 2,
-            batch_size:   8,
+            batch_size: 8,
             when_ready: false,
         }
     }

src/receivers/buffer_unordered_batched/sync.rs

@@ -1,5 +1,5 @@
 use crate::{receiver::ReceiverStats, receivers::mpsc};
-use futures::{Future, StreamExt};
+use futures::{executor::block_on, Future, StreamExt};
 use std::{
     any::TypeId,
     marker::PhantomData,
@@ -16,7 +16,7 @@ use crate::{
     builder::{ReceiverSubscriber, ReceiverSubscriberBuilder},
     msgs,
     receiver::{AnyReceiver, ReceiverTrait, SendError, TypedReceiver},
-    Bus, BatchHandler, Message, Untyped,
+    BatchHandler, Bus, Message, Untyped,
 };
 
 pub struct BufferUnorderedBatchedSyncSubscriber<T, M>
@@ -78,19 +78,16 @@ async fn buffer_unordered_poller<T, M>(
     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 ut = ut.downcast_sync::<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()
+        rx.ready_chunks(cfg.batch_size).left_stream()
     } else {
-        rx.chunks(cfg.batch_size)
-            .right_stream()
+        rx.chunks(cfg.batch_size).right_stream()
     };
 
     let mut rx = rx
@@ -101,7 +98,9 @@ async fn buffer_unordered_poller<T, M>(
             let bus = bus.clone();
             let ut = ut.clone();
 
-            tokio::task::spawn_blocking(move || ut.handle(msgs, &bus))
+            tokio::task::spawn_blocking(move || {
+                block_on(ut.lock_read()).get_ref().handle(msgs, &bus)
+            })
         })
         .buffer_unordered(cfg.max_parallel);
 
@@ -118,7 +117,9 @@ async fn buffer_unordered_poller<T, M>(
 
     let ut = ut.clone();
     let bus_clone = bus.clone();
-    let res = tokio::task::spawn_blocking(move || ut.sync(&bus_clone)).await;
+    let res =
+        tokio::task::spawn_blocking(move || block_on(ut.lock_read()).get_ref().sync(&bus_clone))
+            .await;
 
     match res {
         Ok(Err(err)) => {

src/receivers/local/async.rs

@@ -0,0 +1,180 @@
+use std::{
+    any::TypeId,
+    marker::PhantomData,
+    pin::Pin,
+    sync::{
+        atomic::{AtomicU64, Ordering},
+        Arc,
+    },
+    task::{Context, Poll},
+};
+
+use crate::{receiver::ReceiverStats, receivers::mpsc};
+use futures::{pin_mut, Future, StreamExt};
+
+use super::{LocalConfig, LocalStats};
+use crate::{
+    builder::{ReceiverSubscriber, ReceiverSubscriberBuilder},
+    receiver::{AnyReceiver, ReceiverTrait, SendError, TypedReceiver},
+    Bus, LocalAsyncHandler, Message, Untyped,
+};
+
+pub struct LocalAsyncSubscriber<T, M>
+where
+    T: LocalAsyncHandler<M> + 'static,
+    M: Message,
+{
+    cfg: LocalConfig,
+    _m: PhantomData<(T, M)>,
+}
+
+impl<T, M> ReceiverSubscriber<T> for LocalAsyncSubscriber<T, M>
+where
+    T: LocalAsyncHandler<M> + 'static,
+    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(LocalStats {
+            buffer: AtomicU64::new(0),
+            buffer_total: AtomicU64::new(cfg.buffer_size as _),
+        });
+
+        let arc = Arc::new(LocalAsync::<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))
+                    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<LocalStats>,
+    _cfg: LocalConfig,
+) where
+    T: LocalAsyncHandler<M> + 'static,
+    M: Message,
+{
+    let ut = ut.downcast_local::<T>().unwrap();
+    let bus1 = bus.clone();
+
+    let x = rx.then(|msg| {
+        let bus1 = bus1.clone();
+        ut.spawn_local(move |item| {
+            Box::pin(async move {
+                let _ = item.handle(msg, &bus1).await;
+            })
+        })
+    });
+
+    pin_mut!(x);
+
+    while let Some(_) = x.next().await {
+        stats.buffer.fetch_sub(1, Ordering::Relaxed);
+    }
+
+    let bus_clone = bus.clone();
+    ut.spawn_local(move |item| {
+        Box::pin(async move {
+            let _ = item.sync(&bus_clone).await;
+        })
+    })
+    .await;
+
+    println!("[EXIT] LocalAsync<{}>", std::any::type_name::<M>());
+}
+
+pub struct LocalAsync<M: Message> {
+    tx: mpsc::Sender<M>,
+    stats: Arc<LocalStats>,
+}
+
+impl<T, M> ReceiverSubscriberBuilder<M, T> for LocalAsync<M>
+where
+    T: LocalAsyncHandler<M> + 'static,
+    M: Message,
+{
+    type Entry = LocalAsyncSubscriber<T, M>;
+    type Config = LocalConfig;
+
+    fn build(cfg: Self::Config) -> Self::Entry {
+        LocalAsyncSubscriber {
+            cfg,
+            _m: Default::default(),
+        }
+    }
+}
+
+impl<M: Message> TypedReceiver<M> for LocalAsync<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 LocalAsync<M> {
+    fn typed(&self) -> AnyReceiver<'_> {
+        AnyReceiver::new(self)
+    }
+
+    fn type_id(&self) -> TypeId {
+        TypeId::of::<LocalAsync<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(())
+    }
+}

src/receivers/local/mod.rs

@@ -0,0 +1,25 @@
+mod r#async;
+mod sync;
+
+use std::sync::atomic::AtomicU64;
+
+pub use sync::{LocalSync, LocalSyncSubscriber};
+
+pub use r#async::{LocalAsync, LocalAsyncSubscriber};
+
+#[derive(Debug)]
+pub struct LocalStats {
+    pub buffer: AtomicU64,
+    pub buffer_total: AtomicU64,
+}
+
+#[derive(Copy, Clone, Debug)]
+pub struct LocalConfig {
+    pub buffer_size: usize,
+}
+
+impl Default for LocalConfig {
+    fn default() -> Self {
+        Self { buffer_size: 1 }
+    }
+}

src/receivers/local/sync.rs

@@ -0,0 +1,177 @@
+use super::{LocalConfig, LocalStats};
+use crate::{receiver::ReceiverStats, receivers::mpsc};
+use futures::{pin_mut, Future, StreamExt};
+use std::{
+    any::TypeId,
+    marker::PhantomData,
+    pin::Pin,
+    sync::{
+        atomic::{AtomicU64, Ordering},
+        Arc,
+    },
+    task::{Context, Poll},
+};
+
+use crate::{
+    builder::{ReceiverSubscriber, ReceiverSubscriberBuilder},
+    receiver::{AnyReceiver, ReceiverTrait, SendError, TypedReceiver},
+    Bus, LocalHandler, Message, Untyped,
+};
+
+pub struct LocalSyncSubscriber<T, M>
+where
+    T: LocalHandler<M> + 'static,
+    M: Message,
+{
+    cfg: LocalConfig,
+    _m: PhantomData<(M, T)>,
+}
+
+impl<T, M> ReceiverSubscriber<T> for LocalSyncSubscriber<T, M>
+where
+    T: LocalHandler<M> + 'static,
+    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(LocalStats {
+            buffer: AtomicU64::new(0),
+            buffer_total: AtomicU64::new(cfg.buffer_size as _),
+        });
+
+        let arc = Arc::new(LocalSync::<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))
+                    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<LocalStats>,
+    _cfg: LocalConfig,
+) where
+    T: LocalHandler<M> + 'static,
+    M: Message,
+{
+    let ut = ut.downcast_local::<T>().unwrap();
+    let bus1 = bus.clone();
+
+    let x = rx.then(|msg| {
+        let bus1 = bus1.clone();
+        ut.spawn_local(move |item| {
+            let _ = item.handle(msg, &bus1);
+
+            Box::pin(async move {})
+        })
+    });
+
+    pin_mut!(x);
+
+    while let Some(_) = x.next().await {
+        stats.buffer.fetch_sub(1, Ordering::Relaxed);
+    }
+
+    let bus_clone = bus.clone();
+    ut.spawn_local(move |item| {
+        let _ = item.sync(&bus_clone);
+        Box::pin(async move {})
+    })
+    .await;
+
+    println!("[EXIT] LocalAsync<{}>", std::any::type_name::<M>());
+}
+
+pub struct LocalSync<M: Message> {
+    tx: mpsc::Sender<M>,
+    stats: Arc<LocalStats>,
+}
+
+impl<T, M> ReceiverSubscriberBuilder<M, T> for LocalSync<M>
+where
+    T: LocalHandler<M> + 'static,
+    M: Message,
+{
+    type Entry = LocalSyncSubscriber<T, M>;
+    type Config = LocalConfig;
+
+    fn build(cfg: Self::Config) -> Self::Entry {
+        LocalSyncSubscriber {
+            cfg,
+            _m: Default::default(),
+        }
+    }
+}
+
+impl<M: Message> TypedReceiver<M> for LocalSync<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 LocalSync<M> {
+    fn typed(&self) -> AnyReceiver<'_> {
+        AnyReceiver::new(self)
+    }
+
+    fn type_id(&self) -> TypeId {
+        TypeId::of::<LocalSync<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(())
+    }
+}

src/receivers/local_batched/async.rs

@@ -0,0 +1,196 @@
+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::{LocalBatchedConfig, LocalBatchedStats};
+use crate::{
+    builder::{ReceiverSubscriber, ReceiverSubscriberBuilder},
+    receiver::{AnyReceiver, ReceiverTrait, SendError, TypedReceiver},
+    Bus, LocalAsyncBatchHandler, Message, Untyped,
+};
+
+pub struct LocalBatchedAsyncSubscriber<T, M>
+where
+    T: LocalAsyncBatchHandler<M> + 'static,
+    M: Message,
+{
+    cfg: LocalBatchedConfig,
+    _m: PhantomData<(T, M)>,
+}
+
+impl<T, M> ReceiverSubscriber<T> for LocalBatchedAsyncSubscriber<T, M>
+where
+    T: LocalAsyncBatchHandler<M> + 'static,
+    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(LocalBatchedStats {
+            buffer: AtomicU64::new(0),
+            buffer_total: AtomicU64::new(cfg.buffer_size as _),
+            batch: AtomicU64::new(0),
+            batch_size: AtomicU64::new(cfg.batch_size as _),
+        });
+
+        let arc = Arc::new(LocalBatchedAsync::<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))
+                    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<LocalBatchedStats>,
+    cfg: LocalBatchedConfig,
+) where
+    T: LocalAsyncBatchHandler<M> + 'static,
+    M: Message,
+{
+    let ut = ut.downcast_local::<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();
+
+        ut.spawn_local(move |item| {
+            Box::pin(async move {
+                let _ = item.handle(msgs, &bus_clone).await;
+            })
+        })
+        .await;
+    }
+
+    let bus_clone = bus.clone();
+    ut.spawn_local(move |item| {
+        Box::pin(async move {
+            let _ = item.sync(&bus_clone).await;
+        })
+    })
+    .await;
+
+    println!("[EXIT] LocalBatchedAsync<{}>", std::any::type_name::<M>());
+}
+
+pub struct LocalBatchedAsync<M: Message> {
+    tx: mpsc::Sender<M>,
+    stats: Arc<LocalBatchedStats>,
+}
+
+impl<T, M> ReceiverSubscriberBuilder<M, T> for LocalBatchedAsync<M>
+where
+    T: LocalAsyncBatchHandler<M> + 'static,
+    M: Message,
+{
+    type Entry = LocalBatchedAsyncSubscriber<T, M>;
+    type Config = LocalBatchedConfig;
+
+    fn build(cfg: Self::Config) -> Self::Entry {
+        LocalBatchedAsyncSubscriber {
+            cfg,
+            _m: Default::default(),
+        }
+    }
+}
+
+impl<M: Message> TypedReceiver<M> for LocalBatchedAsync<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 LocalBatchedAsync<M> {
+    fn typed(&self) -> AnyReceiver<'_> {
+        AnyReceiver::new(self)
+    }
+
+    fn type_id(&self) -> TypeId {
+        TypeId::of::<Self>()
+    }
+
+    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(())
+    }
+}

src/receivers/local_batched/mod.rs

@@ -0,0 +1,33 @@
+mod r#async;
+mod sync;
+
+use std::sync::atomic::AtomicU64;
+
+pub use sync::{LocalBatchedSync, LocalBatchedSyncSubscriber};
+
+pub use r#async::{LocalBatchedAsync, LocalBatchedAsyncSubscriber};
+
+#[derive(Debug)]
+pub struct LocalBatchedStats {
+    pub buffer: AtomicU64,
+    pub buffer_total: AtomicU64,
+    pub batch: AtomicU64,
+    pub batch_size: AtomicU64,
+}
+
+#[derive(Copy, Clone, Debug)]
+pub struct LocalBatchedConfig {
+    pub buffer_size: usize,
+    pub batch_size: usize,
+    pub when_ready: bool,
+}
+
+impl Default for LocalBatchedConfig {
+    fn default() -> Self {
+        Self {
+            buffer_size: 4,
+            batch_size: 16,
+            when_ready: false,
+        }
+    }
+}

src/receivers/local_batched/sync.rs

@@ -0,0 +1,193 @@
+use super::{LocalBatchedConfig, LocalBatchedStats};
+use crate::{
+    builder::{ReceiverSubscriber, ReceiverSubscriberBuilder},
+    receiver::{AnyReceiver, ReceiverTrait, SendError, TypedReceiver},
+    Bus, LocalBatchHandler, 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},
+};
+
+pub struct LocalBatchedSyncSubscriber<T, M>
+where
+    T: LocalBatchHandler<M> + 'static,
+    M: Message,
+{
+    cfg: LocalBatchedConfig,
+    _m: PhantomData<(M, T)>,
+}
+
+impl<T, M> ReceiverSubscriber<T> for LocalBatchedSyncSubscriber<T, M>
+where
+    T: LocalBatchHandler<M> + 'static,
+    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(LocalBatchedStats {
+            buffer: AtomicU64::new(0),
+            buffer_total: AtomicU64::new(cfg.buffer_size as _),
+            batch: AtomicU64::new(0),
+            batch_size: AtomicU64::new(cfg.batch_size as _),
+        });
+
+        let arc = Arc::new(LocalBatchedSync::<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))
+                    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<LocalBatchedStats>,
+    cfg: LocalBatchedConfig,
+) where
+    T: LocalBatchHandler<M> + 'static,
+    M: Message,
+{
+    let ut = ut.downcast_local::<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();
+
+        ut.spawn_local(move |item| {
+            let _ = item.handle(msgs, &bus_clone);
+
+            Box::pin(async move {})
+        })
+        .await;
+    }
+
+    let ut = ut.clone();
+    let bus_clone = bus.clone();
+    ut.spawn_local(move |item| {
+        let _ = item.sync(&bus_clone);
+        Box::pin(async move {})
+    })
+    .await;
+
+    println!("[EXIT] LocalBatchedSync<{}>", std::any::type_name::<M>());
+}
+
+pub struct LocalBatchedSync<M: Message> {
+    tx: mpsc::Sender<M>,
+    stats: Arc<LocalBatchedStats>,
+}
+
+impl<T, M> ReceiverSubscriberBuilder<M, T> for LocalBatchedSync<M>
+where
+    T: LocalBatchHandler<M> + 'static,
+    M: Message,
+{
+    type Entry = LocalBatchedSyncSubscriber<T, M>;
+    type Config = LocalBatchedConfig;
+
+    fn build(cfg: Self::Config) -> Self::Entry {
+        LocalBatchedSyncSubscriber {
+            cfg,
+            _m: Default::default(),
+        }
+    }
+}
+
+impl<M: Message> TypedReceiver<M> for LocalBatchedSync<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 LocalBatchedSync<M> {
+    fn typed(&self) -> AnyReceiver<'_> {
+        AnyReceiver::new(self)
+    }
+
+    fn type_id(&self) -> TypeId {
+        TypeId::of::<Self>()
+    }
+
+    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(())
+    }
+}

src/receivers/mod.rs

@@ -1,5 +1,7 @@
 mod buffer_unordered;
 mod buffer_unordered_batched;
+mod local;
+mod local_batched;
 mod mpsc_futures;
 mod synchronize_batched;
 mod synchronized;
@@ -14,8 +16,8 @@ pub use buffer_unordered::{
 };
 
 pub use buffer_unordered_batched::{
-    BufferUnorderedBatchedAsync, BufferUnorderedBatchedAsyncSubscriber, BufferUnorderedBatchedConfig,
-    BufferUnorderedBatchedSync, BufferUnorderedBatchedSyncSubscriber,
+    BufferUnorderedBatchedAsync, BufferUnorderedBatchedAsyncSubscriber,
+    BufferUnorderedBatchedConfig, BufferUnorderedBatchedSync, BufferUnorderedBatchedSyncSubscriber,
 };
 
 pub use synchronized::{
@@ -27,3 +29,10 @@ pub use synchronize_batched::{
     SynchronizeBatchedAsync, SynchronizeBatchedAsyncSubscriber, SynchronizeBatchedConfig,
     SynchronizeBatchedSync, SynchronizeBatchedSyncSubscriber,
 };
+
+pub use local::{LocalAsync, LocalAsyncSubscriber, LocalConfig, LocalSync, LocalSyncSubscriber};
+
+pub use local_batched::{
+    LocalBatchedAsync, LocalBatchedAsyncSubscriber, LocalBatchedConfig, LocalBatchedSync,
+    LocalBatchedSyncSubscriber,
+};

src/receivers/mpsc_futures.rs

@@ -99,7 +99,7 @@ impl<T> Stream for Receiver<T> {
                 }
 
                 Poll::Pending
-            },
+            }
         }
     }
 }

src/receivers/synchronize_batched/async.rs

@@ -11,7 +11,6 @@ use std::{
 
 use crate::{receiver::ReceiverStats, receivers::mpsc};
 use futures::{Future, StreamExt};
-use tokio::sync::Mutex;
 
 use super::{SynchronizeBatchedConfig, SynchronizeBatchedStats};
 use crate::{
@@ -78,20 +77,17 @@ async fn buffer_unordered_poller<T, M>(
     T: AsyncBatchSynchronizedHandler<M> + 'static,
     M: Message,
 {
-    let ut = ut.downcast::<Mutex<T>>().unwrap();
+    let ut = ut.downcast_send::<T>().unwrap();
 
-    let rx = rx
-        .inspect(|_|{ 
-            stats.buffer.fetch_sub(1, Ordering::Relaxed);
-            stats.batch.fetch_add(1, Ordering::Relaxed); 
-        });
+    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()
+        rx.ready_chunks(cfg.batch_size).left_stream()
     } else {
-        rx.chunks(cfg.batch_size)
-            .right_stream()
+        rx.chunks(cfg.batch_size).right_stream()
     };
 
     while let Some(msgs) = rx.next().await {
@@ -101,8 +97,7 @@ async fn buffer_unordered_poller<T, M>(
         let ut = ut.clone();
 
         let res =
-            tokio::task::spawn(async move { ut.lock().await.handle(msgs, &bus_clone).await })
-                .await;
+            tokio::task::spawn(async move { ut.lock().await.handle(msgs, &bus_clone).await }).await;
 
         match res {
             Ok(Err(err)) => {

src/receivers/synchronize_batched/sync.rs

@@ -6,7 +6,7 @@ use crate::{
     BatchSynchronizedHandler, Bus, Message, Untyped,
 };
 use crate::{receiver::ReceiverStats, receivers::mpsc};
-use futures::{Future, StreamExt};
+use futures::{executor::block_on, Future, StreamExt};
 use std::{
     any::TypeId,
     marker::PhantomData,
@@ -17,7 +17,6 @@ use std::{
     },
     task::{Context, Poll},
 };
-use tokio::sync::Mutex;
 
 pub struct SynchronizeBatchedSyncSubscriber<T, M>
 where
@@ -75,20 +74,17 @@ async fn buffer_unordered_poller<T, M>(
     T: BatchSynchronizedHandler<M> + 'static,
     M: Message,
 {
-    let ut = ut.downcast::<Mutex<T>>().unwrap();
+    let ut = ut.downcast_send::<T>().unwrap();
 
-    let rx = rx
-        .inspect(|_|{ 
-            stats.buffer.fetch_sub(1, Ordering::Relaxed);
-            stats.batch.fetch_add(1, Ordering::Relaxed); 
-        });
+    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()
+        rx.ready_chunks(cfg.batch_size).left_stream()
     } else {
-        rx.chunks(cfg.batch_size)
-            .right_stream()
+        rx.chunks(cfg.batch_size).right_stream()
     };
 
     while let Some(msgs) = rx.next().await {
@@ -98,10 +94,10 @@ async fn buffer_unordered_poller<T, M>(
         let ut = ut.clone();
 
         let res = tokio::task::spawn_blocking(move || {
-            let mut uut = futures::executor::block_on(ut.lock());
-            
+            let mut uut = block_on(ut.lock());
             uut.handle(msgs, &bus_clone)
-        }).await;
+        })
+        .await;
 
         match res {
             Ok(Err(err)) => {
@@ -113,10 +109,7 @@ async fn buffer_unordered_poller<T, M>(
 
     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;
+    let res = tokio::task::spawn_blocking(move || block_on(ut.lock()).sync(&bus_clone)).await;
 
     match res {
         Ok(Err(err)) => {

src/receivers/synchronized/async.rs

@@ -11,7 +11,6 @@ use std::{
 
 use crate::{receiver::ReceiverStats, receivers::mpsc};
 use futures::{Future, StreamExt};
-use tokio::sync::Mutex;
 
 use super::{SynchronizedConfig, SynchronizedStats};
 use crate::{
@@ -76,10 +75,13 @@ async fn buffer_unordered_poller<T, M>(
     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();
+    let ut = ut.downcast_send::<T>().unwrap();
+    let ut1 = ut.clone();
+    let bus1 = bus.clone();
+
+    let mut x = rx.then(move |msg| {
+        let bus = bus1.clone();
+        let ut = ut1.clone();
 
         tokio::task::spawn(async move { ut.lock().await.handle(msg, &bus).await })
     });

src/receivers/synchronized/sync.rs

@@ -11,7 +11,6 @@ use std::{
     },
     task::{Context, Poll},
 };
-use tokio::sync::Mutex;
 
 use crate::{
     builder::{ReceiverSubscriber, ReceiverSubscriberBuilder},
@@ -74,12 +73,15 @@ async fn buffer_unordered_poller<T, M>(
     T: SynchronizedHandler<M> + 'static,
     M: Message,
 {
-    let ut = ut.downcast::<Mutex<T>>().unwrap();
+    let ut = ut.downcast_send::<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))
+        tokio::task::spawn_blocking(move || {
+            let mut uut = block_on(ut.lock());
+            uut.handle(msg, &bus)
+        })
     });
 
     while let Some(err) = x.next().await {
@@ -95,10 +97,7 @@ async fn buffer_unordered_poller<T, M>(
 
     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;
+    let res = tokio::task::spawn_blocking(move || block_on(ut.lock()).sync(&bus_clone)).await;
 
     match res {
         Ok(Err(err)) => {
@@ -107,10 +106,7 @@ async fn buffer_unordered_poller<T, M>(
         _ => (),
     }
 
-    println!(
-        "[EXIT] BufferUnorderedSync<{}>",
-        std::any::type_name::<M>()
-    );
+    println!("[EXIT] BufferUnorderedSync<{}>", std::any::type_name::<M>());
 }
 
 pub struct SynchronizedSync<M: Message> {

src/untyped.rs

@@ -0,0 +1,174 @@
+use core::any::Any;
+use core::future::Future;
+use core::pin::Pin;
+use std::sync::Arc;
+
+use tokio::sync::mpsc;
+use tokio::sync::Notify;
+use tokio::sync::{Mutex, MutexGuard, RwLock, RwLockReadGuard, RwLockWriteGuard};
+
+#[derive(Debug)]
+pub enum Lock<'a, T> {
+    ReadOnly(&'a T),
+    RwRead(RwLockReadGuard<'a, T>),
+    RwWrite(RwLockWriteGuard<'a, T>),
+    WriteOnly(MutexGuard<'a, T>),
+}
+
+impl<'a, T> Lock<'a, T> {
+    pub fn get_ref(&self) -> &T {
+        match self {
+            Lock::ReadOnly(inner) => &inner,
+            Lock::RwRead(inner) => &inner,
+            Lock::RwWrite(inner) => &inner,
+            Lock::WriteOnly(inner) => &inner,
+        }
+    }
+
+    pub fn get_mut(&mut self) -> &mut T {
+        match self {
+            Lock::ReadOnly(_) => panic!("!!"),
+            Lock::RwRead(_) => panic!("!!"),
+            Lock::RwWrite(inner) => &mut *inner,
+            Lock::WriteOnly(inner) => &mut *inner,
+        }
+    }
+}
+
+pub enum Downcasted<T> {
+    ReadOnly(Arc<T>),
+    ReadWrite(Arc<RwLock<T>>),
+    WriteOnly(Arc<Mutex<T>>),
+}
+
+impl<T> Clone for Downcasted<T> {
+    fn clone(&self) -> Self {
+        match self {
+            Downcasted::ReadOnly(inner) => Downcasted::ReadOnly(inner.clone()),
+            Downcasted::ReadWrite(inner) => Downcasted::ReadWrite(inner.clone()),
+            Downcasted::WriteOnly(inner) => Downcasted::WriteOnly(inner.clone()),
+        }
+    }
+}
+
+impl<T: 'static> Downcasted<T> {
+    pub async fn lock_read(&self) -> Lock<'_, T> {
+        match self {
+            Downcasted::ReadOnly(inner) => Lock::ReadOnly(&inner),
+            Downcasted::ReadWrite(inner) => Lock::RwRead(inner.read().await),
+            Downcasted::WriteOnly(inner) => Lock::WriteOnly(inner.lock().await),
+        }
+    }
+    pub async fn lock_write(&self) -> Lock<'_, T> {
+        match self {
+            Downcasted::ReadOnly(_) => unimplemented!(),
+            Downcasted::ReadWrite(inner) => Lock::RwWrite(inner.write().await),
+            Downcasted::WriteOnly(inner) => Lock::WriteOnly(inner.lock().await),
+        }
+    }
+}
+
+#[derive(Clone)]
+pub struct Untyped {
+    inner: Arc<dyn Any + Send + Sync>,
+}
+
+impl Untyped {
+    pub fn new_readonly<T: Send + Sync + 'static>(item: T) -> Self {
+        Self {
+            inner: Arc::new(item),
+        }
+    }
+
+    pub fn new_rwlock<T: Send + Sync + 'static>(item: T) -> Self {
+        Self {
+            inner: Arc::new(RwLock::new(item)),
+        }
+    }
+
+    pub fn new_mutex<T: Send + 'static>(item: T) -> Self {
+        Self {
+            inner: Arc::new(Mutex::new(item)),
+        }
+    }
+
+    pub fn new_local<T: 'static, F: FnOnce() -> T + Send + 'static>(f: F) -> Self {
+        Self {
+            inner: Arc::new(ThreadDedicated::new(f)),
+        }
+    }
+
+    pub fn downcast_sync<T: Send + Sync + 'static>(self) -> Option<Downcasted<T>> {
+        let item = match self.inner.clone().downcast::<RwLock<T>>() {
+            Ok(inner) => Downcasted::ReadWrite(inner),
+            Err(_) => return None,
+        };
+
+        Some(item)
+    }
+
+    pub fn downcast_send1<T: Send + 'static>(self) -> Option<Downcasted<T>> {
+        let item = match self.inner.clone().downcast::<Mutex<T>>() {
+            Ok(inner) => Downcasted::WriteOnly(inner),
+            Err(_) => return None,
+        };
+
+        Some(item)
+    }
+
+    pub fn downcast_send<T: Send + 'static>(self) -> Option<Arc<Mutex<T>>> {
+        self.inner.clone().downcast::<Mutex<T>>().ok()
+    }
+
+    #[inline]
+    pub fn downcast_local<T: 'static>(self) -> Option<Arc<ThreadDedicated<T>>> {
+        self.inner.clone().downcast::<ThreadDedicated<T>>().ok()
+    }
+}
+
+pub struct ThreadDedicated<T: 'static> {
+    sender: mpsc::Sender<
+        Box<dyn for<'a> FnOnce(&'a mut T) -> Pin<Box<dyn Future<Output = ()> + 'a>> + Send>,
+    >,
+    notify: Arc<Notify>,
+}
+
+impl<T: 'static> ThreadDedicated<T> {
+    pub fn new<F: FnOnce() -> T + Send + 'static>(builder: F) -> Self {
+        let notify = Arc::new(Notify::new());
+        let (sender, mut receiver) = mpsc::channel(1);
+
+        let sender: mpsc::Sender<
+            Box<dyn for<'a> FnOnce(&'a mut T) -> Pin<Box<dyn Future<Output = ()> + 'a>> + Send>,
+        > = sender;
+        let notify_clone = notify.clone();
+        std::thread::spawn(move || {
+            futures::executor::block_on(async move {
+                let mut obj = builder();
+
+                loop {
+                    let cb = match receiver.recv().await {
+                        Some(x) => x,
+                        None => break,
+                    };
+
+                    cb(&mut obj).await;
+                    notify_clone.notify_one();
+                }
+            });
+        });
+
+        Self { sender, notify }
+    }
+
+    pub async fn spawn_local<
+        F: for<'a> FnOnce(&'a mut T) -> Pin<Box<dyn Future<Output = ()> + 'a>> + Send + 'static,
+    >(
+        &self,
+        cb: F,
+    ) {
+        self.sender.send(Box::new(cb)).await.ok().unwrap();
+
+        self.notify.notified().await
+    }
+}