作曲演员

为什么不延长 Actor 直接地,或者如果您希望非actors也可以被listenable,那么创建一个listenable actor,它使用listenable扩展actor?

然后你会重写 receive 就像你在上面所做的那样(除了你想打电话给 super.receive 还有,是不是?--您只需要修改传入的函数)。

我建议你扩大演员范围,用 abstract override .

为什么我以前没见过这个问题,呃,好吧,迟了总比没见过好:

http://doc.akka.io/docs/akka/snapshot/scala/routing.html

下面是一个解决方案(示例从scala开始的修改版本):

import se.scalablesolutions.akka.actor.Actor

case class AddListener(who: Actor)
case class RemoveListener(who: Actor)

class ListenableActor extends Actor {
    private var listeners: List[Actor] = Nil

    def receive = {
        case AddListener(who) => listeners ::= who
        case RemoveListener(who) => listeners.filter(_ ne who)
    }

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

class ImplementingActor extends ListenableActor {
    override def receive = {
        super.receive orElse {
            case Message(content) => println(content)
        }
    }
}

Akka对此提供了内置支持: https://github.com/jboner/akka/blob/release-1.2/akka-actor/src/main/scala/akka/routing/Listeners.scala