views:

76

answers:

1

Given the following code:

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

and

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

Creating an instance of B val t = new B() throws the following exception:

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)

Could somebody please enlighten me why that is? :)

+1  A: 

Inside the Actor.actor block, you must refer to things like react and reactWithin using the 'self' variable, like so: self.reactWithin(1000). This is to distinguish them from the methods already inherited from the parent class.

Kevin
Of course, me so stupid. Thanks for this. Weird though that it took two weeks for someone to answer this... :)
LeChe