On Friday, 11 April 2014 10:35:46 UTC+1, Iain Hull wrote:
>
> However I will look for another approach.
>
I think I have found a clean way to inject the DeathReportActor code into a
parent actor. I have made this actor a trait and renamed it to
ChildMonitor. I would be very grateful if someone could advise if this is
a valid use of inheritance with actors? I put the traits logic into the
unhandled method as this allows subclasses to use the normal receive method
as well as context.become and context.unbecome. However I am not sure if
this is a valid approach to stacking actor behavior or does it break the
Actor's contract. Can I safely modify state and access the other Actor
methods in unhandled?
trait ChildMonitor extends Actor {
private var watches = Map[ActorRef, Any]()
def monitorChild(child: ActorRef, message: Any): Unit = {
watches += child -> message
context.watch(child)
}
override def unhandled(message: Any): Unit = message match {
case Terminated(child) =>
watches.get(child) foreach (m => self ! m)
watches -= child
case _ =>
super.unhandled(message)
}
}
class GuardianActor extends Actor with ChildMonitor {
var fatedOpt: Option[ActorRef] = None
def receive = {
case Create(value) =>
fatedOpt = Some(context.actorOf(pheonixProps(value), "pheonix"))
case Recreate(value) =>
fatedOpt match {
case Some(fated) =>
monitorChild(fated, Create(value))
context.system.stop(fated)
// fated ! PoisonPill
case None =>
fatedOpt = Some(context.actorOf(pheonixProps(value), "pheonix"))
}
}
}
Thanks for your help,
Iain.
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