Class RestartSink

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.

Inheritance

object

RestartSink

Inherited Members

object.Equals(object)

object.Equals(object, object)

object.GetHashCode()

object.GetType()

object.MemberwiseClone()

object.ReferenceEquals(object, object)

object.ToString()

Namespace: Akka.Streams.Dsl

Assembly: Akka.Streams.dll

Syntax

public static class RestartSink

Methods

WithBackoff<T, TMat>(Func<Sink<T, TMat>>, RestartSettings)

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 IKillSwitch 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 BackoffOptions.

Declaration

public static Sink<T, NotUsed> WithBackoff<T, TMat>(Func<Sink<T, TMat>> sinkFactory, RestartSettings settings)

Parameters

Type	Name	Description
Func<Sink<T, TMat>>	sinkFactory	A factory for producing the Sink to wrap.
RestartSettings	settings	RestartSettings defining restart configuration

Returns

Type	Description
Sink<T, NotUsed>

Type Parameters

Name	Description
T
TMat

WithBackoff<T, TMat>(Func<Sink<T, TMat>>, TimeSpan, TimeSpan, double)

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 IKillSwitch 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 BackoffOptions.

Declaration

[Obsolete("Use the overloaded method which accepts Akka.Stream.RestartSettings instead.")]
public static Sink<T, NotUsed> WithBackoff<T, TMat>(Func<Sink<T, TMat>> sinkFactory, TimeSpan minBackoff, TimeSpan maxBackoff, double randomFactor)

Parameters

Type	Name	Description
Func<Sink<T, TMat>>	sinkFactory	A factory for producing the Sink to wrap.
TimeSpan	minBackoff	Minimum (initial) duration until the child actor will started again, if it is terminated
TimeSpan	maxBackoff	The exponential back-off is capped to this duration
double	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.

Returns

Type	Description
Sink<T, NotUsed>

Type Parameters

Name	Description
T
TMat

WithBackoff<T, TMat>(Func<Sink<T, TMat>>, TimeSpan, TimeSpan, double, int)

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 IKillSwitch 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 BackoffOptions.

Declaration

[Obsolete("Use the overloaded method which accepts Akka.Stream.RestartSettings instead.")]
public static Sink<T, NotUsed> WithBackoff<T, TMat>(Func<Sink<T, TMat>> sinkFactory, TimeSpan minBackoff, TimeSpan maxBackoff, double randomFactor, int maxRestarts)

Parameters

Type	Name	Description
Func<Sink<T, TMat>>	sinkFactory	A factory for producing the Sink to wrap.
TimeSpan	minBackoff	Minimum (initial) duration until the child actor will started again, if it is terminated
TimeSpan	maxBackoff	The exponential back-off is capped to this duration
double	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.
int	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.

Returns

Type	Description
Sink<T, NotUsed>

Type Parameters

Name	Description
T
TMat