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akka.pattern

Patterns

object Patterns

"Pre Java 8" Java API for Akka patterns such as ask, pipe and others.

These methods are possible to call from Java however work with the Scala scala.concurrent.Future, due to the lack of non-blocking reactive Future implementation before Java 8.

For Java applications developed with Java 8 and later, you might want to use akka.pattern.PatternsCS instead, which provide alternatives for these patterns which work with java.util.concurrent.CompletionStage.

Source
Patterns.scala
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  1. final def !=(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  2. final def ##(): Int
    Definition Classes
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  3. final def ==(arg0: Any): Boolean
    Definition Classes
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  4. def after[T](duration: FiniteDuration, scheduler: Scheduler, context: ExecutionContext, value: Future[T]): Future[T]

    Returns a scala.concurrent.Future that will be completed with the success or failure of the provided Callable after the specified duration.

  5. def after[T](duration: FiniteDuration, scheduler: Scheduler, context: ExecutionContext, value: Callable[Future[T]]): Future[T]

    Returns a scala.concurrent.Future that will be completed with the success or failure of the provided Callable after the specified duration.

  6. final def asInstanceOf[T0]: T0
    Definition Classes
    Any
  7. def ask(selection: ActorSelection, message: Any, timeoutMillis: Long): Future[AnyRef]

    Java API for `akka.pattern.ask`: Sends a message asynchronously and returns a scala.concurrent.Future holding the eventual reply message; this means that the target akka.actor.ActorSelection needs to send the result to the sender reference provided.

    Java API for `akka.pattern.ask`: Sends a message asynchronously and returns a scala.concurrent.Future holding the eventual reply message; this means that the target akka.actor.ActorSelection needs to send the result to the sender reference provided.

    The Future will be completed with an akka.pattern.AskTimeoutException after the given timeout has expired; this is independent from any timeout applied while awaiting a result for this future (i.e. in Await.result(..., timeout)). A typical reason for AskTimeoutException is that the recipient actor didn't send a reply.

    Warning: When using future callbacks, inside actors you need to carefully avoid closing over the containing actor’s object, i.e. do not call methods or access mutable state on the enclosing actor from within the callback. This would break the actor encapsulation and may introduce synchronization bugs and race conditions because the callback will be scheduled concurrently to the enclosing actor. Unfortunately there is not yet a way to detect these illegal accesses at compile time.

    Recommended usage:

    final Future<Object> f = Patterns.ask(selection, request, timeout);
    f.onSuccess(new Procedure<Object>() {
      public void apply(Object o) {
        nextActor.tell(new EnrichedResult(request, o));
      }
    });
  8. def ask(selection: ActorSelection, message: Any, timeout: Timeout): Future[AnyRef]

    Java API for `akka.pattern.ask`: Sends a message asynchronously and returns a scala.concurrent.Future holding the eventual reply message; this means that the target akka.actor.ActorSelection needs to send the result to the sender reference provided.

    Java API for `akka.pattern.ask`: Sends a message asynchronously and returns a scala.concurrent.Future holding the eventual reply message; this means that the target akka.actor.ActorSelection needs to send the result to the sender reference provided.

    The Future will be completed with an akka.pattern.AskTimeoutException after the given timeout has expired; this is independent from any timeout applied while awaiting a result for this future (i.e. in Await.result(..., timeout)). A typical reason for AskTimeoutException is that the recipient actor didn't send a reply.

    Warning: When using future callbacks, inside actors you need to carefully avoid closing over the containing actor’s object, i.e. do not call methods or access mutable state on the enclosing actor from within the callback. This would break the actor encapsulation and may introduce synchronization bugs and race conditions because the callback will be scheduled concurrently to the enclosing actor. Unfortunately there is not yet a way to detect these illegal accesses at compile time.

    Recommended usage:

    final Future<Object> f = Patterns.ask(selection, request, timeout);
    f.onSuccess(new Procedure<Object>() {
      public void apply(Object o) {
        nextActor.tell(new EnrichedResult(request, o));
      }
    });
  9. def ask(actor: ActorRef, message: Any, timeoutMillis: Long): Future[AnyRef]

    Java API for `akka.pattern.ask`: Sends a message asynchronously and returns a scala.concurrent.Future holding the eventual reply message; this means that the target actor needs to send the result to the sender reference provided.

    Java API for `akka.pattern.ask`: Sends a message asynchronously and returns a scala.concurrent.Future holding the eventual reply message; this means that the target actor needs to send the result to the sender reference provided.

    The Future will be completed with an akka.pattern.AskTimeoutException after the given timeout has expired; this is independent from any timeout applied while awaiting a result for this future (i.e. in Await.result(..., timeout)). A typical reason for AskTimeoutException is that the recipient actor didn't send a reply.

    Warning: When using future callbacks, inside actors you need to carefully avoid closing over the containing actor’s object, i.e. do not call methods or access mutable state on the enclosing actor from within the callback. This would break the actor encapsulation and may introduce synchronization bugs and race conditions because the callback will be scheduled concurrently to the enclosing actor. Unfortunately there is not yet a way to detect these illegal accesses at compile time.

    Recommended usage:

    final Future<Object> f = Patterns.ask(worker, request, timeout);
    f.onSuccess(new Procedure<Object>() {
      public void apply(Object o) {
        nextActor.tell(new EnrichedResult(request, o));
      }
    });
  10. def ask(actor: ActorRef, message: Any, timeout: Timeout): Future[AnyRef]

    Java API for `akka.pattern.ask`: Sends a message asynchronously and returns a scala.concurrent.Future holding the eventual reply message; this means that the target actor needs to send the result to the sender reference provided.

    Java API for `akka.pattern.ask`: Sends a message asynchronously and returns a scala.concurrent.Future holding the eventual reply message; this means that the target actor needs to send the result to the sender reference provided.

    The Future will be completed with an akka.pattern.AskTimeoutException after the given timeout has expired; this is independent from any timeout applied while awaiting a result for this future (i.e. in Await.result(..., timeout)). A typical reason for AskTimeoutException is that the recipient actor didn't send a reply.

    Warning: When using future callbacks, inside actors you need to carefully avoid closing over the containing actor’s object, i.e. do not call methods or access mutable state on the enclosing actor from within the callback. This would break the actor encapsulation and may introduce synchronization bugs and race conditions because the callback will be scheduled concurrently to the enclosing actor. Unfortunately there is not yet a way to detect these illegal accesses at compile time.

    Recommended usage:

    final Future<Object> f = Patterns.ask(worker, request, timeout);
    f.onSuccess(new Procedure<Object>() {
      public void apply(Object o) {
        nextActor.tell(new EnrichedResult(request, o));
      }
    });
  11. def askWithReplyTo(selection: ActorSelection, messageFactory: Function[ActorRef, Any], timeoutMillis: Long): Future[AnyRef]

    A variation of ask which allows to implement "replyTo" pattern by including sender reference in message.

    A variation of ask which allows to implement "replyTo" pattern by including sender reference in message.

    final Future<Object> f = Patterns.askWithReplyTo(
      selection,
      replyTo -> new Request(replyTo),
      timeout);
  12. def askWithReplyTo(actor: ActorRef, messageFactory: Function[ActorRef, Any], timeoutMillis: Long): Future[AnyRef]

    A variation of ask which allows to implement "replyTo" pattern by including sender reference in message.

    A variation of ask which allows to implement "replyTo" pattern by including sender reference in message.

    final Future<Object> f = Patterns.askWithReplyTo(
      worker,
      replyTo -> new Request(replyTo),
      timeout);
  13. def askWithReplyTo(actor: ActorRef, messageFactory: Function[ActorRef, Any], timeout: Timeout): Future[AnyRef]

    A variation of ask which allows to implement "replyTo" pattern by including sender reference in message.

    A variation of ask which allows to implement "replyTo" pattern by including sender reference in message.

    final Future<Object> f = Patterns.askWithReplyTo(
      worker,
      replyTo -> new Request(replyTo),
      timeout);
  14. def clone(): AnyRef
    Attributes
    protected[java.lang]
    Definition Classes
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    Annotations
    @native() @throws( ... )
  15. final def eq(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  16. def equals(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  17. def finalize(): Unit
    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( classOf[java.lang.Throwable] )
  18. final def getClass(): Class[_]
    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  19. def gracefulStop(target: ActorRef, timeout: FiniteDuration, stopMessage: Any): Future[Boolean]

    Returns a scala.concurrent.Future that will be completed with success (value true) when existing messages of the target actor has been processed and the actor has been terminated.

    Returns a scala.concurrent.Future that will be completed with success (value true) when existing messages of the target actor has been processed and the actor has been terminated.

    Useful when you need to wait for termination or compose ordered termination of several actors.

    If you want to invoke specialized stopping logic on your target actor instead of PoisonPill, you can pass your stop command as stopMessage parameter

    If the target actor isn't terminated within the timeout the scala.concurrent.Future is completed with failure akka.pattern.AskTimeoutException.

  20. def gracefulStop(target: ActorRef, timeout: FiniteDuration): Future[Boolean]

    Returns a scala.concurrent.Future that will be completed with success (value true) when existing messages of the target actor has been processed and the actor has been terminated.

    Returns a scala.concurrent.Future that will be completed with success (value true) when existing messages of the target actor has been processed and the actor has been terminated.

    Useful when you need to wait for termination or compose ordered termination of several actors.

    If the target actor isn't terminated within the timeout the scala.concurrent.Future is completed with failure akka.pattern.AskTimeoutException.

  21. def hashCode(): Int
    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  22. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  23. final def ne(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  24. final def notify(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  25. final def notifyAll(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  26. def pipe[T](future: Future[T], context: ExecutionContext): pattern.PipeableFuture[T]

    Register an onComplete callback on this scala.concurrent.Future to send the result to the given akka.actor.ActorRef or akka.actor.ActorSelection.

    Register an onComplete callback on this scala.concurrent.Future to send the result to the given akka.actor.ActorRef or akka.actor.ActorSelection. Returns the original Future to allow method chaining. If the future was completed with failure it is sent as a akka.actor.Status.Failure to the recipient.

    Recommended usage example:

    final Future<Object> f = Patterns.ask(worker, request, timeout);
    // apply some transformation (i.e. enrich with request info)
    final Future<Object> transformed = f.map(new akka.japi.Function<Object, Object>() { ... });
    // send it on to the next operator
    Patterns.pipe(transformed, context).to(nextActor);
  27. def retry[T](attempt: Callable[Future[T]], attempts: Int, delay: FiniteDuration, scheduler: Scheduler, context: ExecutionContext): Future[T]

    Returns an internally retrying scala.concurrent.Future The first attempt will be made immediately, and each subsequent attempt will be made after 'delay'.

    Returns an internally retrying scala.concurrent.Future The first attempt will be made immediately, and each subsequent attempt will be made after 'delay'. A scheduler (eg context.system.scheduler) must be provided to delay each retry If attempts are exhausted the returned future is simply the result of invoking attempt. Note that the attempt function will be invoked on the given execution context for subsequent tries and therefore must be thread safe (not touch unsafe mutable state).

  28. final def synchronized[T0](arg0: ⇒ T0): T0
    Definition Classes
    AnyRef
  29. def toString(): String
    Definition Classes
    AnyRef → Any
  30. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  31. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  32. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @native() @throws( ... )

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