CODEWITHSUNDEEP
scalaakka
jeypijeypi
jeypijeypi

Reputation: 373

How can I send message to actor from different class?

I have two classes with different ActorSystem with their corresponding actors. How can actor from class1 send message to actor in class2?

Upvotes: 1

Views: 2264

Answers (3)

sourcedelica
sourcedelica

Reputation: 24040

See the docs on Actor Paths. The actor path includes the actor system.

So for example if your actor systems are named system1 and system2, and both of your actors are top level actors named actor1 and actor2, you can get ActorRefs for them like:

// inside actor1
val actor2 = system.actorFor("akka://system2/user/actor2")
actor2 ! "Foo"

and

// inside actor2
val actor1 = system.actorFor("akka://system1/user/actor1")
actor1 ! "bar"

Upvotes: 0

drexin
drexin

Reputation: 24413

Why do you have 2 ActorSystems? Unless you have a really good reason, you should create all your actors in the same ActorSystem. Creating an ActorSystem is very expensive and communication as well as error handling are harder. Here's a simple example of communication between actors:

class Foo extends Actor {

  val barActor = context.actorFor("/user/bar")

  def receive = {
    case 'Send => barActor ! "message from foo!"
  }
}

class Bar extends Actor {
  def receive = {
    case x => println("Got " + x)
  }
}

object Main {
  def main(args: Array[String]) {
    val system = ActorSystem("MySystem")
    val foo = system.actorOf(Props[Foo], "foo")
    val bar = system.actorOf(Props[Bar], "bar")

    foo ! 'Send
  }
}

With system.actorFor or context.actorFor, you can retrieve an ActorRef for a given path. The path for user created actors always starts with /user and includes all parent actors. So if you have a hierarchy of 3 actors the path could be /user/actorA/actorB/actorC.

Upvotes: 5

Karel Bílek
Karel Bílek

Reputation: 37660

I am not really sure what are you asking about.

If the actor class is MyClass and the message object is Message, you just do

val myInstance = new MyClass()
myInstance ! Message

And that's it. You can call that from within any other actor.

Upvotes: -1

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