akka.actor

UntypedActor

abstract class UntypedActor extends Actor

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 akka.actor.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 akka.actor.ActorRef is available as getSelf(), the current message’s sender as getSender() and the akka.actor.UntypedActorContext as getContext(). The only abstract method is onReceive() which is invoked for each processed message unless dynamically overridden using getContext().become().

Here is an example on how to create and use an UntypedActor:

public class SampleUntypedActor extends UntypedActor {

 public static class Reply implements java.io.Serializable {
   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.create("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", getSelf());

     } else if (msg.equals("ErrorKernelWithDirectReply")) {
       // Send work to one-off child which will reply directly to original sender
       getContext().actorOf(Props.create(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(Props.create(Worker.class)).tell("DoWorkAndReplyToMe", getSelf());

     } else {
       unhandled(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, getSelf());

   } else {
     unhandled(message);
   }
 }
}
Source
UntypedActor.scala
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  1. UntypedActor
  2. Actor
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Instance Constructors

  1. new UntypedActor()

Type Members

  1. type Receive = PartialFunction[Any, Unit]

    Definition Classes
    Actor

Abstract Value Members

  1. abstract def onReceive(message: Any): Unit

    To be implemented by concrete UntypedActor, this defines the behavior of the UntypedActor.

    To be implemented by concrete UntypedActor, this defines the behavior of the UntypedActor.

    Annotations
    @throws( classOf[Exception] )

Concrete Value Members

  1. final def !=(arg0: AnyRef): Boolean

    Definition Classes
    AnyRef
  2. final def !=(arg0: Any): Boolean

    Definition Classes
    Any
  3. final def ##(): Int

    Definition Classes
    AnyRef → Any
  4. def +(other: String): String

    Implicit information
    This member is added by an implicit conversion from UntypedActor to StringAdd performed by method any2stringadd in scala.Predef.
    Definition Classes
    StringAdd
  5. def ->[B](y: B): (UntypedActor, B)

    Implicit information
    This member is added by an implicit conversion from UntypedActor to ArrowAssoc[UntypedActor] performed by method any2ArrowAssoc in scala.Predef.
    Definition Classes
    ArrowAssoc
    Annotations
    @inline()
  6. final def ==(arg0: AnyRef): Boolean

    Definition Classes
    AnyRef
  7. final def ==(arg0: Any): Boolean

    Definition Classes
    Any
  8. def aroundPostRestart(reason: Throwable): Unit

    Can be overridden to intercept calls to postRestart.

    Can be overridden to intercept calls to postRestart. Calls postRestart by default.

    Attributes
    protected[akka]
    Definition Classes
    Actor
  9. def aroundPostStop(): Unit

    Can be overridden to intercept calls to postStop.

    Can be overridden to intercept calls to postStop. Calls postStop by default.

    Attributes
    protected[akka]
    Definition Classes
    Actor
  10. def aroundPreRestart(reason: Throwable, message: Option[Any]): Unit

    Can be overridden to intercept calls to preRestart.

    Can be overridden to intercept calls to preRestart. Calls preRestart by default.

    Attributes
    protected[akka]
    Definition Classes
    Actor
  11. def aroundPreStart(): Unit

    Can be overridden to intercept calls to preStart.

    Can be overridden to intercept calls to preStart. Calls preStart by default.

    Attributes
    protected[akka]
    Definition Classes
    Actor
  12. def aroundReceive(receive: Actor.Receive, msg: Any): Unit

    INTERNAL API.

    INTERNAL API.

    Can be overridden to intercept calls to this actor's current behavior.

    receive

    current behavior.

    msg

    current message.

    Attributes
    protected[akka]
    Definition Classes
    Actor
  13. final def asInstanceOf[T0]: T0

    Definition Classes
    Any
  14. def clone(): AnyRef

    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  15. implicit val context: ActorContext

    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.

    WARNING: Only valid within the Actor itself, so do not close over it and publish it to other threads!

    akka.actor.ActorContext is the Scala API. getContext returns a akka.actor.UntypedActorContext, which is the Java API of the actor context.

    Definition Classes
    Actor
  16. def ensuring(cond: (UntypedActor) ⇒ Boolean, msg: ⇒ Any): UntypedActor

    Implicit information
    This member is added by an implicit conversion from UntypedActor to Ensuring[UntypedActor] performed by method any2Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  17. def ensuring(cond: (UntypedActor) ⇒ Boolean): UntypedActor

    Implicit information
    This member is added by an implicit conversion from UntypedActor to Ensuring[UntypedActor] performed by method any2Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  18. def ensuring(cond: Boolean, msg: ⇒ Any): UntypedActor

    Implicit information
    This member is added by an implicit conversion from UntypedActor to Ensuring[UntypedActor] performed by method any2Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  19. def ensuring(cond: Boolean): UntypedActor

    Implicit information
    This member is added by an implicit conversion from UntypedActor to Ensuring[UntypedActor] performed by method any2Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  20. final def eq(arg0: AnyRef): Boolean

    Definition Classes
    AnyRef
  21. def equals(arg0: Any): Boolean

    Definition Classes
    AnyRef → Any
  22. def finalize(): Unit

    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( classOf[java.lang.Throwable] )
  23. def formatted(fmtstr: String): String

    Implicit information
    This member is added by an implicit conversion from UntypedActor to StringFormat performed by method any2stringfmt in scala.Predef.
    Definition Classes
    StringFormat
    Annotations
    @inline()
  24. final def getClass(): Class[_]

    Definition Classes
    AnyRef → Any
  25. def getContext(): UntypedActorContext

    Returns this UntypedActor's UntypedActorContext The UntypedActorContext is not thread safe so do not expose it outside of the UntypedActor.

  26. def getSelf(): ActorRef

    Returns the ActorRef for this actor.

  27. def getSender(): ActorRef

    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.

  28. def hashCode(): Int

    Definition Classes
    AnyRef → Any
  29. final def isInstanceOf[T0]: Boolean

    Definition Classes
    Any
  30. final def ne(arg0: AnyRef): Boolean

    Definition Classes
    AnyRef
  31. final def notify(): Unit

    Definition Classes
    AnyRef
  32. final def notifyAll(): Unit

    Definition Classes
    AnyRef
  33. def postRestart(reason: Throwable): Unit

    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.

    reason

    the Throwable that caused the restart to happen

    Is called right AFTER restart on the newly created Actor to allow reinitialization after an Actor crash.

    Definition Classes
    UntypedActorActor
    Annotations
    @throws( classOf[Exception] )
  34. def postStop(): Unit

    User overridable callback.

    User overridable callback.

    Is called asynchronously after 'actor.stop()' is invoked. Empty default implementation.

    Definition Classes
    UntypedActorActor
    Annotations
    @throws( classOf[Exception] )
  35. def preRestart(reason: Throwable, message: Option[Any]): Unit

    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.

    reason

    the Throwable that caused the restart to happen

    message

    optionally the current message the actor processed when failing, if applicable

    Is called on a crashed Actor right BEFORE it is restarted to allow clean up of resources before Actor is terminated.

    Definition Classes
    UntypedActorActor
    Annotations
    @throws( classOf[Exception] )
  36. def preStart(): Unit

    User overridable callback.

    User overridable callback.

    Is called when an Actor is started. Actor are automatically started asynchronously when created. Empty default implementation.

    Definition Classes
    UntypedActorActor
    Annotations
    @throws( classOf[Exception] )
  37. final def receive: PartialFunction[Any, Unit]

    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.

    Definition Classes
    UntypedActorActor
  38. implicit final val self: ActorRef

    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
    

    Definition Classes
    Actor
  39. final def sender(): ActorRef

    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 akka.actor.ActorSystem.

    WARNING: Only valid within the Actor itself, so do not close over it and publish it to other threads!

    Definition Classes
    Actor
  40. def supervisorStrategy: SupervisorStrategy

    User overridable definition the strategy to use for supervising child actors.

    User overridable definition the strategy to use for supervising child actors.

    Definition Classes
    UntypedActorActor
  41. final def synchronized[T0](arg0: ⇒ T0): T0

    Definition Classes
    AnyRef
  42. def toString(): String

    Definition Classes
    AnyRef → Any
  43. def unhandled(message: Any): Unit

    Recommended convention is to call this method if the message isn't handled in #onReceive (e.

    Recommended convention is to call this method if the message isn't handled in #onReceive (e.g. unknown message type). By default it fails with either a akka.actor.DeathPactException (in case of an unhandled akka.actor.Terminated message) or publishes an akka.actor.UnhandledMessage to the actor's system's akka.event.EventStream.

    Definition Classes
    UntypedActorActor
  44. final def wait(): Unit

    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  45. final def wait(arg0: Long, arg1: Int): Unit

    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  46. final def wait(arg0: Long): Unit

    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  47. def [B](y: B): (UntypedActor, B)

    Implicit information
    This member is added by an implicit conversion from UntypedActor to ArrowAssoc[UntypedActor] performed by method any2ArrowAssoc in scala.Predef.
    Definition Classes
    ArrowAssoc

Shadowed Implicit Value Members

  1. val self: Any

    Implicit information
    This member is added by an implicit conversion from UntypedActor to StringAdd performed by method any2stringadd in scala.Predef.
    Shadowing
    This implicitly inherited member is shadowed by one or more members in this class.
    To access this member you can use a type ascription:
    (untypedActor: StringAdd).self
    Definition Classes
    StringAdd
  2. val self: Any

    Implicit information
    This member is added by an implicit conversion from UntypedActor to StringFormat performed by method any2stringfmt in scala.Predef.
    Shadowing
    This implicitly inherited member is shadowed by one or more members in this class.
    To access this member you can use a type ascription:
    (untypedActor: StringFormat).self
    Definition Classes
    StringFormat

Deprecated Value Members

  1. def x: UntypedActor

    Implicit information
    This member is added by an implicit conversion from UntypedActor to ArrowAssoc[UntypedActor] performed by method any2ArrowAssoc in scala.Predef.
    Shadowing
    This implicitly inherited member is ambiguous. One or more implicitly inherited members have similar signatures, so calling this member may produce an ambiguous implicit conversion compiler error.
    To access this member you can use a type ascription:
    (untypedActor: ArrowAssoc[UntypedActor]).x
    Definition Classes
    ArrowAssoc
    Annotations
    @deprecated
    Deprecated

    (Since version 2.10.0) Use leftOfArrow instead

  2. def x: UntypedActor

    Implicit information
    This member is added by an implicit conversion from UntypedActor to Ensuring[UntypedActor] performed by method any2Ensuring in scala.Predef.
    Shadowing
    This implicitly inherited member is ambiguous. One or more implicitly inherited members have similar signatures, so calling this member may produce an ambiguous implicit conversion compiler error.
    To access this member you can use a type ascription:
    (untypedActor: Ensuring[UntypedActor]).x
    Definition Classes
    Ensuring
    Annotations
    @deprecated
    Deprecated

    (Since version 2.10.0) Use resultOfEnsuring instead

Inherited from Actor

Inherited from AnyRef

Inherited from Any

Inherited by implicit conversion any2stringadd from UntypedActor to StringAdd

Inherited by implicit conversion any2stringfmt from UntypedActor to StringFormat

Inherited by implicit conversion any2ArrowAssoc from UntypedActor to ArrowAssoc[UntypedActor]

Inherited by implicit conversion any2Ensuring from UntypedActor to Ensuring[UntypedActor]

Ungrouped