akka.stream.actor

Interface RequestStrategy

All Known Implementing Classes:

MaxInFlightRequestStrategy, OneByOneRequestStrategy$, WatermarkRequestStrategy, ZeroRequestStrategy$

public interface RequestStrategy

An ActorSubscriber defines a RequestStrategy to control the stream back pressure.

Method Summary

Modifier and Type	Method and Description
int	requestDemand(int remainingRequested) Invoked by the ActorSubscriber after each incoming message to determine how many more elements to request from the stream.

Method Detail

requestDemand

int requestDemand(int remainingRequested)

Invoked by the ActorSubscriber after each incoming message to determine how many more elements to request from the stream.

Parameters:

remainingRequested - current remaining number of elements that have been requested from upstream but not received yet

Returns:

demand of more elements from the stream, returning 0 means that no more elements will be requested for now