本节主要内容

停止运行Typed Actor

当Typed Actor不再需要时要将其停止，有3种方法停止Typed Actor的运行：
（1）通过system.shutdown()停止ActorSystem中所有的Typed Actor；
（2）调用TypedActor(system).stop(mySquarer)停止指定的Typed Actor；
（3）调用TypedActor(system).poisonPill(otherSquarer)停止指定的Typed Actor。
具体使用代码如下：

/** 停止Typed Actor*/
object Example_3 extends  App {import akka.event.Loggingimport scala.concurrent.{ Promise, Future }import akka.actor.{ TypedActor, TypedProps }import scala.concurrent.duration._trait Squarer {//fire-and-forget消息def squareDontCare(i: Int): Unit//非阻塞send-request-reply消息def square(i: Int): Future[Int]//阻塞式的send-request-reply消息def squareNowPlease(i: Int): Option[Int]//阻塞式的send-request-reply消息def squareNow(i: Int): Int}//混入PostStop和PreStartclass SquarerImpl(val name: String) extends  Squarer with PostStop with PreStart {import TypedActor.contextval log = Logging(context.system,TypedActor.self.getClass())def this() = this("SquarerImpl")def squareDontCare(i: Int): Unit = i * idef square(i: Int): Future[Int] = Promise.successful(i * i).futuredef squareNowPlease(i: Int): Option[Int] = Some(i * i)def squareNow(i: Int): Int = i * idef postStop(): Unit={log.info ("TypedActor Stopped")}def preStart(): Unit={log.info ("TypedActor  Started")}}val system = ActorSystem("TypedActorSystem")val log = Logging(system, this.getClass)//使用默认构造函数创建Typed Actorval mySquarer: Squarer =TypedActor(system).typedActorOf(TypedProps[SquarerImpl](),"mySquarer")//使用非默认构造函数创建Typed Actorval otherSquarer: Squarer =TypedActor(system).typedActorOf(TypedProps(classOf[Squarer],new SquarerImpl("SquarerImpl")), "otherSquarer")//Request-reply-with-future 消息发送val fSquare = mySquarer.square(10)val result = Await.result(fSquare, 5 second)log.info("fSquare="+result)//调用poisonPill方法停止Actor运行TypedActor(system).poisonPill(otherSquarer)//调用stop方法停止Actor运行TypedActor(system).stop(mySquarer)//system.shutdown()
}

代码运行结果如下所示。

[INFO] [03/21/2016 22:41:51.119] [TypedActorSystem-akka.actor.default-dispatcher-2] [$Proxy0(akka://TypedActorSystem)] TypedActor  Started
[INFO] [03/21/2016 22:41:51.123] [TypedActorSystem-akka.actor.default-dispatcher-2] [$Proxy1(akka://TypedActorSystem)] TypedActor  Started
[INFO] [03/21/2016 22:41:51.124] [main] [Example12_10$(akka://TypedActorSystem)] fSquare=100
[INFO] [03/21/2016 22:41:51.131] [TypedActorSystem-akka.actor.default-dispatcher-5] [$Proxy1(akka://TypedActorSystem)] TypedActor Stopped
[INFO] [03/21/2016 22:41:51.131] [TypedActorSystem-akka.actor.default-dispatcher-3] [$Proxy0(akka://TypedActorSystem)] TypedActor Stopped

• 1

代码中类SquarerImpl 混入了PreStart和PostStop两个trait：class SquarerImpl(val name: String) extends Squarer with PostStop with PreStart，这样的话在创建TypedActor之前和停止TypedActor后能够进行相应的操作，本例中主要是为监视TypedActor的创建和停止过程。代码TypedActor(system).stop(mySquarer)通过stop方法停止TypedActor，而TypedActor(system)
.poisonPill(otherSquarer)通过调用poisonPill方法停止运行TypedActor。