Akka Java Receptionist ask pattern example-CodePudding

I need to find an actor from non-actor class having System object using receptionist. I can only find Scala examples but none has java example of ask pattern.

CodePudding user response：

Here is Akka's documentation for interacting with actors outside of the actor system.

There is a tab for Java.

CodePudding user response：

It would look something like (apologies if the Java is atrocious):

// TargetActor.Command is just a placeholder
ActorSystem<Void> system;
ServiceKey<TargetActor.Command> key;

CompletionStage<Receptionist.Listing> result =
    AskPattern.ask(
        system.receptionist(),
        replyTo -> Receptionist.find(key, replyTo),
        Duration.ofSeconds(10),  // ask will fail if no reply received in this time
        system.scheduler()
    );

You can then use the usual CompletionStage methods (e.g. whenComplete and friends) to extract the Receptionist.Listing and take appropriate action.