Akka Actor Reply Messages

by Online Tutorials Library July 22, 2022

Akka Actor Reply Messages

You can reply to a message by using sender() method. This method gives you ActorRef which is a instance of sender Actor. You can also store this reference. Replying to a message is simple, you just need to use sender() ! ReplyMsg.

If there is no sender i.e. a message which is sent without an actor or future context, the default sender is a ‘dead-letter’ actor reference.

Akka Actor Replying Message Example

 import akka.actor.{Actor,ActorSystem, Props}; class ActorReplyExample extends Actor{   def receive = {     case message:String => println(“Message recieved from “+sender.path.name+” massage: “+message);     val child = context.actorOf(Props[ActorChildReplyExample],”ActorChild”);     child ! “Hello Child”   } }   class ActorChildReplyExample extends Actor{   def receive ={     case message:String => println(“Message recieved from “+sender.path.name+” massage: “+message);     println(“Replying to “+sender().path.name);     sender()! “I got you message”;   } }  object ActorReplyExample{   def main(args:Array[String]){     val actorSystem = ActorSystem(“ActorSystem”);     val actor = actorSystem.actorOf(Props[ActorReplyExample], “RootActor”);     actor ! “Hello”;   } } 

Output:

Message recieved from deadLetters massage: Hello Message recieved from RootActor massage: Hello Child Replying to RootActor Message recieved from ActorChild massage: I got you message

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