Class SubFusingActorMaterializerImpl


  • public class SubFusingActorMaterializerImpl
    extends Materializer
    This materializer replaces the default phase with one that will fuse operators into an existing interpreter (via registerShell), rather than start a new actor for each of them.

    The default phases are left in-tact since we still respect .async and other tags that were marked within a sub-fused graph.

    • Method Detail

      • executionContext

        public scala.concurrent.ExecutionContextExecutor executionContext()
        Description copied from class: Materializer
        Running a flow graph will require execution resources, as will computations within Sources, Sinks, etc. This ExecutionContextExecutor can be used by parts of the flow to submit processing jobs for execution, run Future callbacks, etc.

        Note that this is not necessarily the same execution context the stream operator itself is running on.

        Specified by:
        executionContext in class Materializer
        Returns:
        (undocumented)
      • isShutdown

        public boolean isShutdown()
        Description copied from class: Materializer
        Indicates if the materializer has been shut down.
        Specified by:
        isShutdown in class Materializer
        Returns:
        (undocumented)
      • materialize

        public <Mat> Mat materialize​(Graph<ClosedShape,​Mat> runnable)
        Description copied from class: Materializer
        This method interprets the given Flow description and creates the running stream. The result can be highly implementation specific, ranging from local actor chains to remote-deployed processing networks.
        Specified by:
        materialize in class Materializer
        Parameters:
        runnable - (undocumented)
        Returns:
        (undocumented)
      • materialize

        public <Mat> Mat materialize​(Graph<ClosedShape,​Mat> runnable,
                                     Attributes defaultAttributes)
        Description copied from class: Materializer
        This method interprets the given Flow description and creates the running stream using an explicitly provided Attributes as top level (least specific) attributes that will be defaults for the materialized stream. The result can be highly implementation specific, ranging from local actor chains to remote-deployed processing networks.
        Specified by:
        materialize in class Materializer
        Parameters:
        runnable - (undocumented)
        defaultAttributes - (undocumented)
        Returns:
        (undocumented)
      • scheduleAtFixedRate

        public Cancellable scheduleAtFixedRate​(scala.concurrent.duration.FiniteDuration initialDelay,
                                               scala.concurrent.duration.FiniteDuration interval,
                                               java.lang.Runnable task)
        Description copied from class: Materializer
        Interface for operators that need timer services for their functionality.

        Schedules a Runnable to be run repeatedly with an initial delay and a frequency. E.g. if you would like the function to be run after 2 seconds and thereafter every 100ms you would set delay=Duration(2, TimeUnit.SECONDS) and interval=Duration(100, TimeUnit.MILLISECONDS).

        It will compensate the delay for a subsequent task if the previous tasks took too long to execute. In such cases, the actual execution interval will differ from the interval passed to the method.

        If the execution of the tasks takes longer than the interval, the subsequent execution will start immediately after the prior one completes (there will be no overlap of executions). This also has the consequence that after long garbage collection pauses or other reasons when the JVM was suspended all "missed" tasks will execute when the process wakes up again.

        In the long run, the frequency of execution will be exactly the reciprocal of the specified interval.

        Warning: scheduleAtFixedRate can result in bursts of scheduled tasks after long garbage collection pauses, which may in worst case cause undesired load on the system. Therefore scheduleWithFixedDelay is often preferred.

        If the Runnable throws an exception the repeated scheduling is aborted, i.e. the function will not be invoked any more.

        Specified by:
        scheduleAtFixedRate in class Materializer
        Parameters:
        initialDelay - (undocumented)
        interval - (undocumented)
        task - (undocumented)
        Returns:
        A Cancellable that allows cancelling the timer. Cancelling is best effort, if the event has been already enqueued it will not have an effect.
      • scheduleOnce

        public Cancellable scheduleOnce​(scala.concurrent.duration.FiniteDuration delay,
                                        java.lang.Runnable task)
        Description copied from class: Materializer
        Interface for operators that need timer services for their functionality. Schedules a single task with the given delay.

        Specified by:
        scheduleOnce in class Materializer
        Parameters:
        delay - (undocumented)
        task - (undocumented)
        Returns:
        A Cancellable that allows cancelling the timer. Cancelling is best effort, if the event has been already enqueued it will not have an effect.
      • schedulePeriodically

        public Cancellable schedulePeriodically​(scala.concurrent.duration.FiniteDuration initialDelay,
                                                scala.concurrent.duration.FiniteDuration interval,
                                                java.lang.Runnable task)
        Description copied from class: Materializer
        Interface for operators that need timer services for their functionality. Schedules a repeated task with the given interval between invocations.

        Specified by:
        schedulePeriodically in class Materializer
        Parameters:
        initialDelay - (undocumented)
        interval - (undocumented)
        task - (undocumented)
        Returns:
        A Cancellable that allows cancelling the timer. Cancelling is best effort, if the event has been already enqueued it will not have an effect.
      • scheduleWithFixedDelay

        public Cancellable scheduleWithFixedDelay​(scala.concurrent.duration.FiniteDuration initialDelay,
                                                  scala.concurrent.duration.FiniteDuration delay,
                                                  java.lang.Runnable task)
        Description copied from class: Materializer
        Interface for operators that need timer services for their functionality.

        Schedules a Runnable to be run repeatedly with an initial delay and a fixed delay between subsequent executions.

        It will not compensate the delay between tasks if the execution takes a long time or if scheduling is delayed longer than specified for some reason. The delay between subsequent execution will always be (at least) the given delay. In the long run, the frequency of execution will generally be slightly lower than the reciprocal of the specified delay.

        If the Runnable throws an exception the repeated scheduling is aborted, i.e. the function will not be invoked any more.

        Specified by:
        scheduleWithFixedDelay in class Materializer
        Parameters:
        initialDelay - (undocumented)
        delay - (undocumented)
        task - (undocumented)
        Returns:
        A Cancellable that allows cancelling the timer. Cancelling is best effort, if the event has been already enqueued it will not have an effect.
      • shutdown

        public void shutdown()
        Description copied from class: Materializer
        Shuts down this materializer and all the operators that have been materialized through this materializer. After having shut down, this materializer cannot be used again. Any attempt to materialize operators after having shut down will result in an IllegalStateException being thrown at materialization time.
        Specified by:
        shutdown in class Materializer
      • subFusingPhase

        public java.lang.Object subFusingPhase()
      • system

        public ActorSystem system()
        Description copied from class: Materializer
        The classic actor system this materializer is backed by (and in which the streams materialized with the materializer will run)
        Specified by:
        system in class Materializer
        Returns:
        (undocumented)
      • withNamePrefix

        public SubFusingActorMaterializerImpl withNamePrefix​(java.lang.String name)
        Description copied from class: Materializer
        The namePrefix shall be used for deriving the names of processing entities that are created during materialization. This is meant to aid logging and failure reporting both during materialization and while the stream is running.
        Specified by:
        withNamePrefix in class Materializer
        Parameters:
        name - (undocumented)
        Returns:
        (undocumented)