how to watch akka actor and capture its context in the Terminated message receive - scala

Question

I want to supervise child actors using context.watch(childActor) API
I see that when the child actor has an uncaught exception, indeed the receive message "Terminated" is called on the parent.
But since I am creating many children actors, each with different contexts and messages, I don't know which particular child actor (and surrounding context) actually failed.
For example:
class ParentActor extends Actor {
override def receive = {
case "delegateWorkToChildrenActors" => {
(0 to 100) foreach {
i =>
val child = context.actorOf(Props(new ChildActor(i, "child-actor")
context.watch(child)
val message = SomeSortOfComplexMessageWithManyParameters(...)
val res = child ? message
res.onComplete {
x: Try[Any] => x match {
case Failure(exception: Throwable) => // can only get timeout exception here
case Success(value) => // continue as usual
}
}
}
}
case m # Terminated(actor) => {
// a child actor was terminated but what is its context ? i.e. which message did it try to handle ?
}
}
override val supervisorStrategy = OneForOneStrategy(maxNrOfRetries = 1, withinTimeRange = 1 minute) {
case m # _ => {
Stop // Assume that the actor was stopped or crashed etc.
}
}
}
class ChildActor(number : Int) extends Actor {
override def receive: Receive = {
case SomeSortOfComplexMessageWithManyParameters => {
// might of got some sort of exception here...
// the parent which is monitoring it received the "Terminate" message
}
}
}
How can I get the message that the child actor worked upon?