SupervisorStrategy strategy not respecting maxNrOfRetries - akka.net

Question

I'm learning Akka.net and am stuck trying to get an actor to restart on failure.
With the following, I would have expected the "child has error" string to display 5 times (maxNrOfRetries), however I only see it once.
Can someone please point out what I'm missing? Is my code wrong, my understanding? Both?
Here is the LINQPad script http://share.linqpad.net/t8x5wl.linq
Thank you
async Task Main()
{
var system = ActorSystem.Create("MySystem");
var parent = system.ActorOf(Props.Create<ParentActor>(), "parent");
var child = await parent.Ask<IActorRef>(new GetChild());
child.Tell(new HelloChild());
child.Tell(new CauseChildToThrow());
child.Tell(new HelloChild());
child.Tell(new StopChild());
await parent.Ask<object>(new EndProcess());
"fin".Dump();
}
public class ParentActor : ReceiveActor
{
public ParentActor()
{
var child = Context.ActorOf(Props.Create<ChildActor>(), "child");
Receive<GetChild>(msg => Sender.Tell(child));
Receive<EndProcess>(msg => Sender.Tell(new {}));
}
protected override SupervisorStrategy SupervisorStrategy()
{
return new OneForOneStrategy(
maxNrOfRetries: 5,
withinTimeRange: Timeout.InfiniteTimeSpan,
localOnlyDecider: x =>
{
//return Directive.Resume; // skips the bad messsage?
return Directive.Restart; // retries with the bad message?
});
}
}
public class ChildActor : ReceiveActor
{
protected override void PreStart()
{
"child prestart".Dump();
}
protected override void PreRestart(Exception reason, object message)
{
"child pre restart".Dump(reason.Message + " " + message.ToString());
}
public ChildActor()
{
"child constructor".Dump();
Receive<HelloChild>(msg => "Child says hi".Dump());
Receive<StopChild>(msg =>
{
"child stopping gracefully".Dump();
Context.Stop(Self);
});
Receive<CauseChildToThrow>(_ =>
{
"child has error".Dump();
throw new MyException();
});
}
}
public class GetChild { }
public class HelloChild { }
public class StopChild { }
public class CauseChildToThrow { }
public class EndProcess { }
public class MyException : Exception{ }

Answer 1

I found this issue. The dying actor needed to resend the failing message back to itself.
protected override void PreRestart(Exception reason, object message)
{
"child pre restart".Dump(reason.Message + " " + message.ToString());
Self.Tell(message);
}
Also, i had to remove the call to
child.Tell(new StopChild());
Working LINQPad script here http://share.linqpad.net/hv6w4g.linq