Found a clue, it seems to work as I had initially expected if I listen
for UnhandledMessage instead of DeadLetter. Perhaps I misunderstood
something from the documentation.
On Wednesday, September 24, 2014 11:25:27 AM UTC-7, Sean Shubin wrote:
>
> As far as I can tell from the documentation, this is the proper way to
> listen for dead letters. Can anyone tell me why the "dead letter" event
> seems to be ignored with this code? All it does is print the number 12345,
> but I would expect it to also print the fact that it got a dead letter. My
> versions are:
> <dependency>
> <groupId>org.scala-lang</groupId>
> <artifactId>scala-library</artifactId>
> <version>2.11.2</version>
> </dependency>
> <dependency>
> <groupId>com.typesafe.akka</groupId>
> <artifactId>akka-actor_2.11</artifactId>
> <version>2.3.6</version>
> </dependency>
>
>
>
> import akka.actor.{ActorSystem, Actor, DeadLetter, Props}
>
> object DeadLetterApp extends App {
> class Listener extends Actor {
> def receive = {
> case d: DeadLetter => println(s"got dead letter $d")
> case null => println("expected a dead letter, but got <null>")
> case x => println(s"expected a dead letter, but got $x of type
> ${x.getClass.getName}")
> }
> }
>
> class MyActor(readyToStop: => Unit) extends Actor {
> override def receive: Receive = {
> case x:Int => println(x)
> case 'stop => readyToStop
> }
> }
>
> val system = ActorSystem()
>
> val listener = system.actorOf(Props(classOf[Listener]))
> val myActor = system.actorOf(Props(classOf[MyActor], system.shutdown _))
>
> system.eventStream.subscribe(listener, classOf[DeadLetter])
>
> myActor ! 12345
> myActor ! "dead letter"
> myActor ! 'stop
> }
>
>
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