Spark深入淺出之Actor編程

package actor

import akka.actor.{Actor, ActorSystem, Props}


/**
 * 當繼承actor後，就是一個Actor,核心方法receive 方法重寫
 */
class SayHelloActor extends Actor {
  /**
   * 1. receive 方法，會被Actor的mailbox(實現了Runnable接口)調用
   * 2.當該Actor的mailbox 接收到消息，就會調用了receive
   * 3.type receive = PartialFunction[Any,Unit]
   *
   * @return
   */
  override def receive: Receive = {
    case "hello" => println("收到hello，迴應hello too :)")
    case "ok" => println("收到ok,迴應ok too :)")
    case "exit" => {
      println("接收到exit，退出系統")
      context.stop(self) //停止actorref
      context.system.terminate() // 退出actorsystem
    }
    case _ => println("匹配不到")
  }
}

object SayHelloActor {
  //1.先創建一個ActorSystem,專門用於創建Actor
  val actorFactory = ActorSystem("actorFactory")
  //2.創建一個Actor的同時，返回Actor的ActorRef
  //Props[SayHelloActor] c創建了一個sayhelloActor實例，使用反射
  //“sayhelloactor" 給actor取名
  //sayHelloActorRef ：Actor就是Props[SayHelloActor] 的ActorRef
  //創建的sayhelloRef 被ActorSystem接管
  val sayHelloActorRef = actorFactory.actorOf(Props[SayHelloActor], "sayHelloActor")

  def main(args: Array[String]): Unit = {
    //給SayHelloActor 發消息（郵箱）
    sayHelloActorRef ! "hello"
    sayHelloActorRef ! "ok"
    sayHelloActorRef ! "exit"
  }
}