KillableGraphStageLogic

INTERNAL API

This allows the dynamic creation of an Inlet for a GraphStage which is connected to a Sink that is available for materialization (e.g. using the subFusingMaterializer). Completion, cancellation and failure of the parent operator is automatically delegated to instances of SubSinkInlet to avoid resource leaks.

To be thread safe this method must only be called from either the constructor of the graph operator during materialization or one of the methods invoked by the graph operator machinery, such as onPush and onPull.

INTERNAL API

This allows the dynamic creation of an Outlet for a GraphStage which is connected to a Source that is available for materialization (e.g. using the subFusingMaterializer). Completion, cancellation and failure of the parent operator is automatically delegated to instances of SubSourceOutlet to avoid resource leaks.

Even so it is good practice to use the timeout method to cancel this Outlet in case the corresponding Source is not materialized within a given time limit, see e.g. ActorMaterializerSettings.

To be thread safe this method must only be called from either the constructor of the graph operator during materialization or one of the methods invoked by the graph operator machinery, such as onPush and onPull.

Invoked before any external events are processed, at the startup of the operator.

Automatically invokes cancel or complete on all the input or output ports that have been called, then marks the stage as stopped.

Automatically invokes cancel or complete on all the input or output ports that have been called, then marks the operator as stopped.

Automatically invokes cancel or fail on all the input or output ports that have been called, then marks the operator as stopped.

Obtain a callback object that can be used asynchronously to re-enter the current GraphStage with an asynchronous notification. The invoke method of the returned AsyncCallback is safe to be called from other threads. It will in the background thread-safely delegate to the passed callback function. I.e. invoke will be called by other thread and the passed handler will be invoked eventually in a thread-safe way by the execution environment.

In case stream is not yet materialized AsyncCallback will buffer events until stream is available.

AsyncCallback.invokeWithFeedback has an internal promise that will be failed if event cannot be processed due to stream completion.

To be thread safe this method must only be called from either the constructor of the graph operator during materialization or one of the methods invoked by the graph operator machinery, such as onPush and onPull.

This object can be cached and reused within the same GraphStageLogic.

Return true if the given output port is ready to be pushed.

Invoked after processing of external events stopped because the operator is about to stop or fail.

Returns a string representation of the object.

The default representation is platform dependent.