Class RestartWithBackoffSink<T>
- java.lang.Object
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- akka.stream.stage.GraphStageWithMaterializedValue<S,NotUsed>
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- akka.stream.stage.GraphStage<SinkShape<T>>
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- akka.stream.scaladsl.RestartWithBackoffSink<T>
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public final class RestartWithBackoffSink<T> extends GraphStage<SinkShape<T>>
Wrap the givenSink
with aSink
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 wrappedSink
is handled by restarting it. The wrappedSink
can however be completed by feeding a completion or error into thisSink
. When that happens, theSink
, if currently running, will terminate and will not be restarted. This can be triggered simply by the upstream completing, or externally by introducing aKillSwitch
right before thisSink
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, thisSink
will backpressure, however any elements already sent may have been lost.This uses the same exponential backoff algorithm as
Backoff
.param: minBackoff minimum (initial) duration until the child actor will started again, if it is terminated param: maxBackoff the exponential back-off is capped to this duration param: randomFactor after calculation of the exponential back-off an additional random delay based on this factor is added, e.g.
0.2
adds up to20%
delay. In order to skip this additional delay pass in0
. param: maxRestarts the amount of restarts is capped to this amount within a time frame of minBackoff. Passing0
will cause no restarts and a negative number will not cap the amount of restarts. param: sinkFactory A factory for producing theSink
to wrap.
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Constructor Summary
Constructors Constructor Description RestartWithBackoffSink(scala.Function0<Sink<T,?>> sinkFactory, scala.concurrent.duration.FiniteDuration minBackoff, scala.concurrent.duration.FiniteDuration maxBackoff, double randomFactor, int maxRestarts)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description RestartWithBackoffLogic<SinkShape<T>>
createLogic(Attributes inheritedAttributes)
Inlet<T>
in()
SinkShape<T>
shape()
The shape of a graph is all that is externally visible: its inlets and outlets.-
Methods inherited from class akka.stream.stage.GraphStage
createLogicAndMaterializedValue
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Methods inherited from class akka.stream.stage.GraphStageWithMaterializedValue
createLogicAndMaterializedValue, initialAttributes, traversalBuilder, withAttributes
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Method Detail
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createLogic
public RestartWithBackoffLogic<SinkShape<T>> createLogic(Attributes inheritedAttributes)
- Specified by:
createLogic
in classGraphStage<SinkShape<T>>
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