RestartSink.withBackoff
Wrap the given Sink with a Sink that will restart it when it fails or complete using an exponential backoff.
Signature
def withBackoff[T](minBackoff: FiniteDuration, maxBackoff: FiniteDuration, randomFactor: Double)(sinkFactory: () => Sink[T, _]): Sink[T, NotUsed]
def withBackoff[T](minBackoff: FiniteDuration, maxBackoff: FiniteDuration, randomFactor: Double, maxRestarts: Int)(sinkFactory: () => Sink[T, _]): Sink[T, NotUsed]Description
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.