object Effect

Factory methods for creating Effect directives - how an event sourced actor reacts on a command.

Source
Effect.scala
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Value Members

  1. def async[Event, State](effect: [Effect[Event, State]]): Effect[Event, State]

    Asynchronous command handling.

    Asynchronous command handling. The effect is run when the Future has been completed. Any incoming commands are stashed and processed later, after current command, when the Future has been completed.

    This can for example be used for retrieval of external information before validating the command.

  2. def asyncReply[Event, State](effect: [ReplyEffect[Event, State]]): ReplyEffect[Event, State]

    Same as Effect.async when the EventSourcedBehavior is created with EventSourcedBehavior.withEnforcedReplies.

  3. def noReply[Event, State]: ReplyEffect[Event, State]

    When is used there will be compilation errors if the returned effect isn't a ReplyEffect.

    When is used there will be compilation errors if the returned effect isn't a ReplyEffect. This noReply can be used as a conscious decision that a reply shouldn't be sent for a specific command or the reply will be sent later.

  4. def none[Event, State]: EffectBuilder[Event, State]

    Do not persist anything

    Do not persist anything

    Side effects can be chained with thenRun

  5. def persist[Event, State](events: Seq[Event]): EffectBuilder[Event, State]

    Persist multiple events

    Persist multiple events

    Side effects can be chained with thenRun

  6. def persist[Event, A <: Event, B <: Event, State](evt1: A, evt2: B, events: Event*): EffectBuilder[Event, State]

    Persist multiple events

    Persist multiple events

    Side effects can be chained with thenRun

  7. def persist[Event, State](event: Event): EffectBuilder[Event, State]

    Persist a single event

    Persist a single event

    Side effects can be chained with thenRun

  8. def persistWithMetadata[Event, State](eventsWithMetadata: [EventWithMetadata[Event]]): EffectBuilder[Event, State]

    Persist multiple events and additional metadata together with the events.

    Persist multiple events and additional metadata together with the events.

    Side effects can be chained with thenRun

  9. def persistWithMetadata[Event, State](eventWithMetadata: EventWithMetadata[Event]): EffectBuilder[Event, State]

    Persist a single event and additional metadata together with the event.

    Persist a single event and additional metadata together with the event.

    Side effects can be chained with thenRun

  10. def reply[ReplyMessage, Event, State](replyTo: ActorRef[ReplyMessage])(replyWithMessage: ReplyMessage): ReplyEffect[Event, State]

    Send a reply message to the command.

    Send a reply message to the command. The type of the reply message must conform to the type specified by the passed replyTo ActorRef.

    This has the same semantics as cmd.replyTo.tell.

    It is provided as a convenience (reducing boilerplate) and a way to enforce that replies are not forgotten when the EventSourcedBehavior is created with EventSourcedBehavior.withEnforcedReplies. When withEnforcedReplies is used there will be compilation errors if the returned effect isn't a ReplyEffect. The reply message will be sent also if withEnforcedReplies isn't used, but then the compiler will not help finding mistakes.

  11. def stash[Event, State](): ReplyEffect[Event, State]

    Stash the current command.

    Stash the current command. Can be unstashed later with Effect.unstashAll.

    Note that the stashed commands are kept in an in-memory buffer, so in case of a crash they will not be processed. They will also be discarded if the actor is restarted (or stopped) due to that an exception was thrown from processing a command or side effect after persisting. The stash buffer is preserved for persist failures if a backoff supervisor strategy is defined with EventSourcedBehavior.onPersistFailure.

    Side effects can be chained with thenRun

  12. def stop[Event, State](): EffectBuilder[Event, State]

    Stop this persistent actor Side effects can be chained with thenRun

  13. def unhandled[Event, State]: EffectBuilder[Event, State]

    This command is not handled, but it is not an error that it isn't.

    This command is not handled, but it is not an error that it isn't.

    Side effects can be chained with thenRun

  14. def unstashAll[Event, State](): Effect[Event, State]

    Unstash the commands that were stashed with Effect.stash.

    Unstash the commands that were stashed with Effect.stash.

    It's allowed to stash messages while unstashing. Those newly added commands will not be processed by this unstashAll effect and have to be unstashed by another unstashAll.

    See also

    EffectBuilder.thenUnstashAll