斯卡拉 – 组成演员

我也期待在Akka库中找到这个功能.我错过了什么或者是否有某种原因让Akka不会包含这个？

trait Listenable { this: Actor =>
    private var listeners: List[Actor] = Nil

    protected def listenerHandler: PartialFunction[Any,Unit] = {
        case AddListener(who) => listeners = who :: listeners
    }

    protected def notifyListeners(event: Any) = {
        listeners.foreach(_.send(event))
    }
}

class SomeActor extends Actor with Listenable
{
    def receive = listenerHandler orElse {
        case Start => notifyListeners(Started())
        case Stop => notifyListeners(Stopped())
    }
}