Dispatcher

risingwave_stream::executor::dispatch

Trait Dispatcher 

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pub trait Dispatcher: Debug + 'static {
    // Required methods
    fn dispatch_data(&mut self, chunk: StreamChunk) -> impl DispatchFuture<'_>;
    fn dispatch_barriers(
        &mut self,
        barrier: DispatcherBarriers,
    ) -> impl DispatchFuture<'_>;
    fn dispatch_watermark(
        &mut self,
        watermark: Watermark,
    ) -> impl DispatchFuture<'_>;
    fn add_outputs(&mut self, outputs: impl IntoIterator<Item = Output>);
    fn remove_outputs(&mut self, actor_ids: &HashSet<ActorId>);
    fn dispatcher_id(&self) -> DispatcherId;
    fn dispatcher_id_str(&self) -> &str;
    fn is_empty(&self) -> bool;
}

Required Methods§

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fn dispatch_data(&mut self, chunk: StreamChunk) -> impl DispatchFuture<'_>

Dispatch a data chunk to downstream actors.

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fn dispatch_barriers( &mut self, barrier: DispatcherBarriers, ) -> impl DispatchFuture<'_>

Dispatch barriers to downstream actors, generally by broadcasting it.

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fn dispatch_watermark( &mut self, watermark: Watermark, ) -> impl DispatchFuture<'_>

Dispatch a watermark to downstream actors, generally by broadcasting it.

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fn add_outputs(&mut self, outputs: impl IntoIterator<Item = Output>)

Add new outputs to the dispatcher.

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fn remove_outputs(&mut self, actor_ids: &HashSet<ActorId>)

Remove outputs to actor_ids from the dispatcher.

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fn dispatcher_id(&self) -> DispatcherId

The ID of the dispatcher. A DispatchExecutor may have multiple dispatchers with different IDs.

Note that the dispatcher id is always equal to the downstream fragment id. See also proto/stream_plan.proto.

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fn dispatcher_id_str(&self) -> &str

Dispatcher id in string. See Dispatcher::dispatcher_id.

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fn is_empty(&self) -> bool

Whether the dispatcher has no outputs. If so, it’ll be cleaned up from the DispatchExecutor.

Dyn Compatibility§

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors§