Counter example with actors.

actorcounter

package io.moo.training.akka
 
import akka.actor.{Actor, Props}
 
class CounterActor extends Actor {
  var counter: Int = 0
 
  override def receive: Receive = {
    case "incr" => counter += 1
    case "get" => sender ! counter
  }
}
 
// main actor application (run by user and starts a supervisor actor)
class Main extends Actor {
  // starts a counter actor.
  val counterActor = context.actorOf(Props[CounterActor], "counter")
  // set incr message to the counter actor.
  counterActor ! "incr"
  // get the status of counter
  counterActor ! "get"
 
  override def receive: Actor.Receive = {
    case count: Int => {
      // give the counter status out and terminate the supervisor actor.
      println(s"count is $count")
      context.stop(self)
    }
  }
}