Scala的演員異常 「上通道反應屬於其他演員」

Question

鑑於以下代碼：

class A extends Actor { 
    def act() { 
    loop { 
     reactWithin(1000) { 
     case _ => println("A Message") 
     } 
    } 
    } 
} 

和

class B extends A { 
    val test = Actor.actor { 
    loop { 
     reactWithin(1000) { 
     case "B" => println("B Message") 
     } 
    } 
    } 
} 

創建乙val t = new B()的實例引發以下例外：

scala.actors.Actor$$anon$1@452bb7e0: caught java.lang.AssertionError: assertion failed: react on channel belonging to other actor 
java.lang.AssertionError: assertion failed: react on channel belonging to other actor 
at scala.actors.ReplyReactor$class.reactWithin(ReplyReactor.scala:123) 
at A.scala$actors$Actor$$super$reactWithin(Tester.scala:11) 
at scala.actors.Actor$class.reactWithin(Actor.scala:613) 
at A.reactWithin(Tester.scala:11) 
at B$$anonfun$1$$anonfun$apply$mcV$sp$1.apply(Tester.scala:24) 
at B$$anonfun$1$$anonfun$apply$mcV$sp$1.apply(Tester.scala:24) 
at scala.actors.Reactor$class.seq(Reactor.scala:280) 
at A.seq(Tester.scala:11) 
at scala.actors.Reactor$$anon$3.andThen(Reactor.scala:258) 
at scala.actors.Combinators$class.loop(Combinators.scala:26) 
at A.loop(Tester.scala:11) 
at B$$anonfun$1.apply$mcV$sp(Tester.scala:23) 
at scala.actors.Actor$$anon$1.act(Actor.scala:135) 
at scala.actors.Reactor$$anonfun$dostart$1.apply(Reactor.scala:222) 
at scala.actors.Reactor$$anonfun$dostart$1.apply(Reactor.scala:222) 
at scala.actors.ReactorTask.run(ReactorTask.scala:36) 
at scala.concurrent.forkjoin.ForkJoinPool$AdaptedRunnable.exec(ForkJoinPool.java:611) 
at scala.concurrent.forkjoin.ForkJoinTask.quietlyExec(ForkJoinTask.java:422) 
at scala.concurrent.forkjoin.ForkJoinWorkerThread.mainLoop(ForkJoinWorkerThread.java:340) 
at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:325) 

有人請賜教，我爲什麼這樣？ :)

Answer 1

在Actor.actor塊內部，您必須使用'self'變量引用諸如react和reactWithin之類的內容，如下所示：self.reactWithin（1000）。這是爲了將它們與已經從父類繼承的方法區分開來。