Class RestartSink$


  • public class RestartSink$
    extends java.lang.Object
    A RestartSink wraps a Sink that gets restarted when it completes or fails.

    They are useful for graphs that need to run for longer than the Sink can necessarily guarantee it will, for example, for Sink streams that depend on a remote server that may crash or become partitioned. The RestartSink ensures that the graph can continue running while the Sink restarts.

    • Field Summary

      Fields 
      Modifier and Type Field Description
      static RestartSink$ MODULE$
      Static reference to the singleton instance of this Scala object.
    • Constructor Summary

      Constructors 
      Constructor Description
      RestartSink$()  
    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      <T> Sink<T,​NotUsed> withBackoff​(scala.concurrent.duration.FiniteDuration minBackoff, scala.concurrent.duration.FiniteDuration maxBackoff, double randomFactor, int maxRestarts, scala.Function0<Sink<T,​?>> sinkFactory)
      Wrap the given Sink with a Sink that will restart it when it fails or complete using an exponential backoff.
      <T> Sink<T,​NotUsed> withBackoff​(scala.concurrent.duration.FiniteDuration minBackoff, scala.concurrent.duration.FiniteDuration maxBackoff, double randomFactor, scala.Function0<Sink<T,​?>> sinkFactory)
      Wrap the given Sink with a Sink that will restart it when it fails or complete using an exponential backoff.
      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
    • Field Detail

      • MODULE$

        public static final RestartSink$ MODULE$
        Static reference to the singleton instance of this Scala object.
    • Constructor Detail

      • RestartSink$

        public RestartSink$()
    • Method Detail

      • withBackoff

        public <T> Sink<T,​NotUsed> withBackoff​(scala.concurrent.duration.FiniteDuration minBackoff,
                                                     scala.concurrent.duration.FiniteDuration maxBackoff,
                                                     double randomFactor,
                                                     scala.Function0<Sink<T,​?>> sinkFactory)
        Wrap the given Sink with a Sink that will restart it when it fails or complete using an exponential backoff.

        This Sink will never cancel, since cancellation by the wrapped Sink is always handled by restarting it. The wrapped Sink can however be completed by feeding a completion or error into this Sink. When that happens, the Sink, if currently running, will terminate and will not be restarted. This can be triggered simply by the upstream completing, or externally by introducing a KillSwitch right before this Sink in the graph.

        The restart process is inherently lossy, since there is no coordination between cancelling and the sending of messages. When the wrapped Sink does cancel, this Sink will backpressure, however any elements already sent may have been lost.

        This uses the same exponential backoff algorithm as Backoff.

        Parameters:
        minBackoff - minimum (initial) duration until the child actor will started again, if it is terminated
        maxBackoff - the exponential back-off is capped to this duration
        randomFactor - after calculation of the exponential back-off an additional random delay based on this factor is added, e.g. 0.2 adds up to 20% delay. In order to skip this additional delay pass in 0.
        sinkFactory - A factory for producing the Sink to wrap.
        Returns:
        (undocumented)
      • withBackoff

        public <T> Sink<T,​NotUsed> withBackoff​(scala.concurrent.duration.FiniteDuration minBackoff,
                                                     scala.concurrent.duration.FiniteDuration maxBackoff,
                                                     double randomFactor,
                                                     int maxRestarts,
                                                     scala.Function0<Sink<T,​?>> sinkFactory)
        Wrap the given Sink with a Sink that will restart it when it fails or complete using an exponential backoff.

        This Sink will not cancel as long as maxRestarts is not reached, since cancellation by the wrapped Sink is handled by restarting it. The wrapped Sink can however be completed by feeding a completion or error into this Sink. When that happens, the Sink, if currently running, will terminate and will not be restarted. This can be triggered simply by the upstream completing, or externally by introducing a KillSwitch right before this Sink in the graph.

        The restart process is inherently lossy, since there is no coordination between cancelling and the sending of messages. When the wrapped Sink does cancel, this Sink will backpressure, however any elements already sent may have been lost.

        This uses the same exponential backoff algorithm as Backoff.

        Parameters:
        minBackoff - minimum (initial) duration until the child actor will started again, if it is terminated
        maxBackoff - the exponential back-off is capped to this duration
        randomFactor - after calculation of the exponential back-off an additional random delay based on this factor is added, e.g. 0.2 adds up to 20% delay. In order to skip this additional delay pass in 0.
        maxRestarts - the amount of restarts is capped to this amount within a time frame of minBackoff. Passing 0 will cause no restarts and a negative number will not cap the amount of restarts.
        sinkFactory - A factory for producing the Sink to wrap.
        Returns:
        (undocumented)