Scala Actor 相关 1. 自定义一个Actor 及 Actor 的状态

最新推荐文章于 2022-06-30 14:15:45 发布

原创最新推荐文章于 2022-06-30 14:15:45 发布 · 224 阅读

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本文深入探讨Scala Actors模型中不同状态的含义与转换，包括New、Blocked、Terminated和Suspended等，通过具体代码示例展示如何创建和操作EchoActor类，以理解Actor生命周期及其状态变化。

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State of an actor.

New - Not yet started
Runnable - Executing
Suspended - Suspended, waiting in a react
TimedSuspended - Suspended, waiting in a reactWithin
Blocked - Blocked waiting in a receive
TimedBlocked - Blocked waiting in a receiveWithin
Terminated - Actor has terminated

定义一个类，EchoActor , 无限循环，等待receive

scala> import scala.actors.Actor
import scala.actors.Actor

scala> :paste
// Entering paste mode (ctrl-D to finish)

class EchoActor extends Actor{
  override def act(): Unit = {
    while(true){
      receive {
        case "lisi" => {
          throw new Exception("不能听到有人说李四")
        }
        case msg => {
          println("echo :"+msg)
        }
      }
    }
  }

  override def exceptionHandler: PartialFunction[Exception, Unit] = {
    case e:Exception => println(e.getMessage)
  }
}

// Exiting paste mode, now interpreting.

warning: there was one deprecation warning; re-run with -deprecation for details
defined class EchoActor

scala> val echoActor = new EchoActor
echoActor: EchoActor = EchoActor@2d6764b2

scala> echoActor.getState
res0: scala.actors.Actor.State.Value = New

scala> echoActor.start()
res1: scala.actors.Actor = EchoActor@2d6764b2

scala> echoActor.getState
res2: scala.actors.Actor.State.Value = Blocked

scala> echoActor ! "zhangsan"
echo :zhangsan

scala> echoActor.getState
res4: scala.actors.Actor.State.Value = Blocked

scala> echoActor ! "lisi"

scala> 不能听到有人说李四


scala> echoActor.getState
res6: scala.actors.Actor.State.Value = Terminated

上述看到 New Blocked Terminated 三种状态，验证了当在 receive 里面待待的时候，得到的状态就是 Blocked.

------------------------------------------------------------------------------------------------------------------------------------------------------------------------

下面验证一下 Suspended 状态

scala> import scala.actors.Actor
import scala.actors.Actor

scala> :paste
// Entering paste mode (ctrl-D to finish)

class EchoActor extends Actor{
  override def act(): Unit = {
    react{
      case "lisi" => throw new Exception("对李四过敏，不要叫李四")
      case msg => println(msg)
    }
  }

  override def exceptionHandler: PartialFunction[Exception, Unit] = {
    case e:Exception => println(e.getMessage)
  }
}

// Exiting paste mode, now interpreting.

warning: there was one deprecation warning; re-run with -deprecation for details
defined class EchoActor

scala> val echoActor = new EchoActor
echoActor: EchoActor = EchoActor@15dcfae7

scala> echoActor.getState
res0: scala.actors.Actor.State.Value = New

scala> echoActor.start()
res1: scala.actors.Actor = EchoActor@15dcfae7

scala> echoActor.getState
res2: scala.actors.Actor.State.Value = Suspended

scala> echoActor ! "zhangsan"

scala> zhangsan


scala> echoActor.getState
res4: scala.actors.Actor.State.Value = Terminated

当一个actor在 react 当中进行等待的时候，其状态为 Suspended.