RestartSink
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package javadsl
Wrap the given Sink with a Sink that will restart it when it fails or complete using an exponential backoff.
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 akka.pattern.Backoff.
minimum (initial) duration until the child actor will started again, if it is terminated
the exponential back-off is capped to this duration
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.
A factory for producing the Sink to wrap.
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.