Akka Props

by Online Tutorials Library July 22, 2022

Akka Props

Props is a configuration class which is used to specify options while creating an actor. It is immutable, so it is thread-safe and shareable.

You can implement Props by importing akka.actor.Props package.

You can create actor by passing a Props instance into the actorOf() factory method which is available in ActorSystem and ActorContext. The actorOf() method returns an instance of ActorRef. This instance is immutable and has one to one relationship with the actor it represents. ActorRef is also serializable so that you can serialize it.

In the following example, we are creating an Actor by using Props.

Akka Actor Example: by using Props

 import akka.actor.Actor; import akka.actor.ActorSystem; import akka.actor.Props; class PropsExample extends Actor {   def receive= {     case msg:String => println(msg+” “+self.path.name)   } } object PropsMain{   def main(args:Array[String]){     var actorSystem = ActorSystem(“ActorSystem”);     var actor = actorSystem.actorOf(Props[PropsExample],”PropExample”);     actor ! “Hello from”   } } 

Output:

Hello from PropExample

There are various other ways to implement Props. Let’s see an example.

Akka Actor Example2: by using Props

 import akka.actor._ class CreatingActor extends Actor{   def receive = {     case msg:String => println(msg+” “+self.path.name)    // Receiving message and name of actor    } }  object CreatingActorExample{   def main(args:Array[String]){     var actorSystem = ActorSystem(“ActorSystem”);     var props1 = Props[CreatingActor];  // creating pops here     var actor1 = actorSystem.actorOf(props1);  // passing pops reference     var actor2 = actorSystem.actorOf(Props[CreatingActor],”Actor2″)  // Passing pops and explicitly giving name to the actor     var actor3 = actorSystem.actorOf(Props(classOf[CreatingActor]),”Actor3″)  // Passing actor class by using classOf     var actor4 = actorSystem.actorOf(Props[CreatingActor], name = “Actor4”)  // Name passing to variable     var actor5 = actorSystem.actorOf(Props(new CreatingActor()), name = “Actor5”) // This approach is not recommended     actor1 ! “Hello”     actor2 ! “Hello”     actor3 ! “Hello”     actor4 ! “Hello”     actor5 ! “Hello”   } }   

Where name is not given explicitly, it will be automatically generated.

Output:

Hello $a// Reference of the name of actor Hello Actor2 Hello Actor4 Hello Actor3 Hello Actor5

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Akka Props

Akka Props

Akka Actor Example: by using Props

Akka Actor Example2: by using Props

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