Java API for `akka.pattern.ask`:
Sends a message asynchronously and returns a 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 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.actor.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)
).
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)); } });
Java API for `akka.pattern.ask`:
Sends a message asynchronously and returns a 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 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.actor.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)
).
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)); } });
Returns a 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 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 Future is completed with failure ActorTimeoutException.
Register an onComplete callback on this Future to send the result to the given actor reference.
Register an onComplete callback on this Future to send the result to the given actor reference. Returns the original Future to allow method chaining.
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 stage Patterns.pipe(transformed).to(nextActor);