Stores the context for this actor, including self, and sender.
Stores the context for this actor, including self, and sender.
It is implicit to support operations such as forward.
ActorContext is the Scala API. getContext returns a
UntypedActorContext, which is the Java API of the actor
context.
Returns the 'self' reference.
The reference sender Actor of the currently processed message.
The reference sender Actor of the currently processed message. This is always a legal destination to send to, even if there is no logical recipient for the reply, in which case it will be sent to the dead letter mailbox.
User overridable callback: By default it calls preStart().
User overridable callback: By default it calls preStart().
Is called right AFTER restart on the newly created Actor to allow reinitialization after an Actor crash.
User overridable callback.
User overridable callback.
Is called asynchronously after 'actor.stop()' is invoked. Empty default implementation.
User overridable callback: By default it disposes of all children and then calls postStop().
User overridable callback: By default it disposes of all children and then calls postStop().
Is called on a crashed Actor right BEFORE it is restarted to allow clean up of resources before Actor is terminated.
User overridable callback.
User overridable callback.
Is called when an Actor is started. Actor are automatically started asynchronously when created. Empty default implementation.
This defines the initial actor behavior, it must return a partial function with the actor logic.
This defines the initial actor behavior, it must return a partial function with the actor logic.
The 'self' field holds the ActorRef for this actor.
The 'self' field holds the ActorRef for this actor.
Can be used to send messages to itself:
self ! message
The reference sender Actor of the last received message.
The reference sender Actor of the last received message.
Is defined if the message was sent from another Actor,
else deadLetters in ActorSystem.
User overridable definition the strategy to use for supervising child actors.
User overridable definition the strategy to use for supervising child actors.
User overridable callback.
User overridable callback.
Is called when a message isn't handled by the current behavior of the actor by default it fails with either a DeathPactException (in case of an unhandled Terminated message) or publishes an UnhandledMessage to the actor's system's EventStream
Actor base trait that should be extended by or mixed to create an Actor with the semantics of the 'Actor Model': http://en.wikipedia.org/wiki/Actor_model
This class is the Java cousin to the Actor Scala interface. Subclass this abstract class to create a MDB-style untyped actor.
An actor has a well-defined (non-cyclic) life-cycle.
The Actor's own ActorRef is available as
getSelf(), the current message’s sender asgetSender()and the UntypedActorContext asgetContext(). The only abstract method isonReceive()which is invoked for each processed message unless dynamically overridden usinggetContext().become().Here is an example on how to create and use an UntypedActor:
public class SampleUntypedActor extends UntypedActor { public class Reply { final public ActorRef sender; final public Result result; Reply(ActorRef sender, Result result) { this.sender = sender; this.result = result; } } private static SupervisorStrategy strategy = new OneForOneStrategy(10, Duration.parse("1 minute"), new Function<Throwable, Directive>() { @Override public Directive apply(Throwable t) { if (t instanceof ArithmeticException) { return resume(); } else if (t instanceof NullPointerException) { return restart(); } else if (t instanceof IllegalArgumentException) { return stop(); } else { return escalate(); } } }); @Override public SupervisorStrategy supervisorStrategy() { return strategy; } public void onReceive(Object message) throws Exception { if (message instanceof String) { String msg = (String)message; if (msg.equals("UseSender")) { // Reply to original sender of message getSender().tell(msg + ":" + getSelf()); } else if (msg.equals("SendToSelf")) { // Send message to the actor itself recursively getSelf().tell("SomeOtherMessage"); } else if (msg.equals("ErrorKernelWithDirectReply")) { // Send work to one-off child which will reply directly to original sender getContext().actorOf(new Props(Worker.class)).tell("DoSomeDangerousWork", getSender()); } else if (msg.equals("ErrorKernelWithReplyHere")) { // Send work to one-off child and collect the answer, reply handled further down getContext().actorOf(new Props(Worker.class)).tell("DoWorkAndReplyToMe"); } else throw new IllegalArgumentException("Unknown message: " + message); } else if (message instanceof Reply) { final Reply reply = (Reply) message; // might want to do some processing/book-keeping here reply.sender.tell(reply.result); } else throw new IllegalArgumentException("Unknown message: " + message); } }