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class PrintMyActorRefActor extends Actor {
  override def receive: Receive = {
    case "printit" =>
      val secondRef = context.actorOf(Props.empty, "second-actor") //자식의 생성에 대한 책임은 부모가 가진다. ( 생성하고 자식노드로 런타임 이동하는 형태의 방법 제한)  
      println(s"Second: $secondRef")
  }
}

val firstRef = system.actorOf(Props[PrintMyActorRefActor], "first-actor")  // actorOf 는 Actor생성시 사용됩니다.
println(s"First : $firstRef")
firstRef ! "printit"   
// !는 스칼라에서 Input을 위한 키워드이며, c++의 cout >> 과 유사한 키워드 , 
//C#또는 JAVA에서는 명시적으로 firstRef.Tell("printit") 이렇게 사용하면 됩니다.


//액터 생성 순서   first-actor <= second-actor  가 parent <= child 관계가 된다.
First : Actor[akka://testSystem/user/first-actor#1053618476]
Second: Actor[akka://testSystem/user/first-actor/second-actor#-1544706041]

var parentActor= system.ActorSelection("akka://testSystem/user/first-actor");
var childActor= system.ActorSelection("akka://testSystem/user/first-actor/second-actor");

class StartStopActor1 extends Actor {
  override def preStart(): Unit = {
    println("first started")
    context.actorOf(Props[StartStopActor2], "second")
  }
  override def postStop(): Unit = println("first stopped")

  override def receive: Receive = {
    case "stop" => context.stop(self)
  }
}

class StartStopActor2 extends Actor {
  override def preStart(): Unit = println("second started")
  override def postStop(): Unit = println("second stopped")

  // Actor.emptyBehavior is a useful placeholder when we don't
  // want to handle any messages in the actor.
  override def receive: Receive = Actor.emptyBehavior
}

val first = system.actorOf(Props[StartStopActor1], "first")
first ! "stop"


//OutPut
//first started
//second started
//second stopped
//first stopped

var supervisor = BackoffSupervisor.Props(
                    Backoff.OnFailure(
                        childProps,
                        childName: "supervised-actor",
                        minBackoff: TimeSpan.FromSeconds(3),
                        maxBackoff: TimeSpan.FromSeconds(30),
                        randomFactor: 0.2)
                    );