Package org.apache.pekko.cluster.sharding.typed

Class ShardingDirectReplication$

java.lang.Object

org.apache.pekko.cluster.sharding.typed.ShardingDirectReplication$

public class ShardingDirectReplication$
extends Object

INTERNAL API

Used when sharding Replicated Event Sourced entities in multiple instances of sharding, for example one per DC in a Multi DC Pekko Cluster.

This actor should be started once on each node where Replicated Event Sourced entities will run (the same nodes that you start sharding on). The entities should be set up with pekko.persistence.typed.scaladsl.EventSourcedBehavior.withEventPublishing or pekko.persistence.typed.javadsl.ReplicatedEventSourcedBehavior#withEventPublishing() If using ReplicatedSharding the replication can be enabled through ReplicatedEntityProvider.withDirectReplication instead of starting this actor manually.

Subscribes to locally written events through the event stream and sends the seen events to all the sharded replicas which can then fast forward their cross-replica event streams to improve latency while allowing less frequent poll for the cross replica queries. Note that since message delivery is at-most-once this can not be the only channel for replica events - the entities must still tail events from the journals of other replicas.

The events are forwarded as pekko.cluster.sharding.typed.ShardingEnvelope this will work out of the box both by default and with a custom extractor since the envelopes are handled internally.

Field Summary

Fields

Modifier and Type	Field	Description
static final ShardingDirectReplication$	MODULE$	Static reference to the singleton instance of this Scala object.

Constructor Summary

Constructors

Constructor	Description
ShardingDirectReplication$()

Method Summary

Modifier and Type	Method	Description
<T> Behavior<ShardingDirectReplication.Command>	apply(String typeName, scala.Option<ReplicaId> selfReplica, scala.collection.immutable.Map<ReplicaId,ActorRef<T>> replicaShardingProxies)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

MODULE$

public static final ShardingDirectReplication$ MODULE$

Static reference to the singleton instance of this Scala object.

Constructor Details

ShardingDirectReplication$

public ShardingDirectReplication$()

Method Details

apply

public <T>
Behavior<ShardingDirectReplication.Command> apply(String typeName,
 scala.Option<ReplicaId> selfReplica,
 scala.collection.immutable.Map<ReplicaId,ActorRef<T>> replicaShardingProxies)