I'm writing tests for an actor that monitors a child actor. If the child
actor dies, the monitor also stops.
Since upgrading to Akka-2.2, I get a warning message when running the test
(most of the time...):
[default-akka.actor.default-dispatcher-2] [akka://default/user/Monitor]
Message [akka.dispatch.sysmsg.DeathWatchNotification] from
TestActor[akka://default/user/Monitor] to
TestActor[akka://default/user/Monitor] was not delivered. [1] dead letters
encountered.
I'm wondering why the actor appears to be sending a DeathWatchNotification
to itself, and why it is not delivered, since the test itself checks that
the actor dies.
The test code:
"monitor the quick and the dead" in new ActorSystemContext {
val monitor = TestProbe()
val a = TestActorRef(new MonitoringActor, "Monitor")
monitor.watch(a)
a ! "hi!"
monitor.expectTerminated(a)
}
The actors (minimal versions of actual code):
class DyingActor extends Actor {
def receive = {
case _ => context.stop(self)
}
}
class MonitoringActor extends Actor {
def receive = {
case Terminated(a) => context.stop(self)
case _ => {
val dyingActor = context.actorOf(Props(new DyingActor))
context.watch(dyingActor)
dyingActor ! "hi"
}
}
}
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