Akka.NET Issue 3597

Program.cs

using System;
using System.IO;
using System.Collections.Generic;
using System.Linq;
using Akka.Actor;
using Akka.Event;
using Akka.Routing;

namespace AkkaTest
{
    class Program
    {
        static void Main(string[] args)
        {
            var actorSystem = ActorSystem.Create("ActorSystem");

            IActorRef coordinator = actorSystem.ActorOf(Props.Create(() => new Coordinator()));

            for (int i = 0; i < 1000; i++)
            {
                ChildActor.ProcessData processData = new ChildActor.ProcessData(i);

                coordinator.Tell(processData);
            }

            coordinator.Tell(new Coordinator.DisposeAll());

            Console.ReadLine();

        }
    }

    public class Coordinator : ReceiveActor
    {
        public class DisposeAll
        {

        }


        private readonly ILoggingAdapter _logger = Context.GetLogger();
        private readonly HashSet<IActorRef> _actors = new HashSet<IActorRef>();
        private IActorRef _consumer;

        public Coordinator()
        {
            Receive<ChildActor.ProcessData>(x => { _consumer.Tell(x); });

            Receive<int>(x => {
        		_actors.Add(Sender);

        		_logger.Info($"Tracking [{_actors.Count}] routees");
        	});
            
            Receive<DisposeAll>(x => { _consumer.Tell(x); });
        }

        protected override void PreStart()
        {
            if (Context.Child("Consumer").Equals(ActorRefs.Nobody))
            {
                _consumer = Context.ActorOf(
                    Props.Create(() => new Consumer())
                    , "Consumer");               
            }
        }

        protected override SupervisorStrategy SupervisorStrategy()
        {
            return new OneForOneStrategy(ex =>
            {
                if (ex is InvalidDataException)
                {
                	_logger.Info($"Resuming {Sender}");
                    return Directive.Resume;
                }

                return Directive.Stop;
            });
        }
    }

    public class Consumer : ReceiveActor
    {
        private readonly ILoggingAdapter _logger = Context.GetLogger();

        private IActorRef _childRouter;

        private int _progress;

        public Consumer()
        {
            Receive<ChildActor.ProcessData>(x =>
            {
                _progress++;

                if(_progress%100==0) _logger.Info("{0} items pushed to router", _progress);

                _childRouter.Forward(x);
            });

            Receive<Terminated>(x =>
            {                
                _logger.Error("Child Router terminated.");
            });

            Receive<Coordinator.DisposeAll>(x => { _childRouter.Forward(new Broadcast(PoisonPill.Instance)); });

            ReceiveAsync<ReceiveTimeout>(async t => {
            	var routeeCount = (await _childRouter.Ask<Routees>(new GetRoutees(), TimeSpan.FromSeconds(3))).Members.Count();
            	_logger.Info("Router has {0} remaining routees", routeeCount);
        	});
        }

        protected override void PreStart()
        {
            if (Context.Child("ChildRouter").Equals(ActorRefs.Nobody))
            {
                _childRouter =
                    Context.ActorOf(
                        Props.Create(() => new ChildActor())
                            .WithRouter(new RoundRobinPool(100))
                            .WithSupervisorStrategy(new OneForOneStrategy(ex => Directive.Escalate)), "ChildRouter");

                Context.Watch(_childRouter);
            }

            Context.SetReceiveTimeout(TimeSpan.FromSeconds(4));
        }

        protected override SupervisorStrategy SupervisorStrategy()
        {
            return new OneForOneStrategy(ex => Directive.Escalate);
        }

    }



    public class ChildActor : ReceiveActor
    {

        public class ProcessData
        {
            public  int Data { get; private set; }

            public ProcessData(int data)
            {
                Data = data;
            }
        }

        private readonly ILoggingAdapter _logger = Context.GetLogger();
        public ChildActor()
        {
            Receive<ProcessData>(x =>
            {
            	Sender.Tell(1);
                if (x.Data % 5 == 0)
                {
                    _logger.Info("{0} is Divisible by 5", x.Data);
                }
                else
                {
                   //if this line is commented, router terminates just fine
                   throw new InvalidDataException("Error while processing.");
                }
            });
        }

        protected override void PostStop(){
        	_logger.Info("Terminated");
        }
    }
}