How do I get exception details from an Akka Supervisor? - scala

Question

I'm testing how a new Actor I'm working on handles unexpected messages. I'd like to assert that it throws a GibberishException in these cases. Here's the test and the implementation so far:
Test:
"""throw a GibberishException for unrecognized messages""" in {
//define a service that creates gibberish-speaking repositories
val stubs = new svcStub(
actorOf(new Actor{
def receive = { case _ => {
self.channel ! "you're savage with the cabbage"
}
}
})
)
val model = actorOf(new HomeModel(stubs.svc,stubs.store))
val supervisor = Supervisor(
SupervisorConfig(
OneForOneStrategy(List(classOf[Exception]), 3, 1000),
Supervise(model,Permanent) :: Nil
)
)
try{
intercept[GibberishException] {
supervisor.start
model !! "plan"
}
} finally {
supervisor.shutdown
}
stubs.store.plan should equal (null)
stubs.svcIsOpen should be (false)
}
Implementation:
class HomeModel(service: PlanService, store: HomeStore)
extends Actor {
private val loaderRepo = service.getRepo()
private var view: Channel[Any] = null
override def postStop() = {
service.close()
}
def receive = {
case "plan" => {
view=self.channel
loaderRepo ! LoadRequest()
}
case p: Plan => {
store.plan=p
view ! store.plan
}
case _ => throw new GibberishException(_)
}
}
However, when I run the test, the exception details get to the Supervisor I established, but I don't know how to do anything with them (like log them or test their type). I'd like to be able to get the exception details here from the supervisor so i can rethrow and intercept them in my test. Outside of a test method, I could imagine this being useful if you wanted to report the nature of an exception in the UI of a running app. Is there a way to get this from the Supervisor when it happens?

Answer 1

Change the OneForOneStrategy to only handle GibberishException, should solve it.