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ActorSubscriberSpec.cs
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ActorSubscriberSpec.cs
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//-----------------------------------------------------------------------
// <copyright file="ActorSubscriberSpec.cs" company="Akka.NET Project">
// Copyright (C) 2009-2021 Lightbend Inc. <http://www.lightbend.com>
// Copyright (C) 2013-2021 .NET Foundation <https://github.com/akkadotnet/akka.net>
// </copyright>
//-----------------------------------------------------------------------
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Akka.Actor;
using Akka.Routing;
using Akka.Streams.Actors;
using Akka.Streams.Dsl;
using Akka.Streams.TestKit;
using Akka.TestKit;
using FluentAssertions;
using Reactive.Streams;
using Xunit;
using Xunit.Abstractions;
namespace Akka.Streams.Tests.Actor
{
public class ActorSubscriberSpec : AkkaSpec
{
public ActorSubscriberSpec(ITestOutputHelper helper)
: base(
AkkaSpecConfig.WithFallback(StreamTestDefaultMailbox.DefaultConfig),
helper)
{
}
[Fact]
public async Task ActorSubscriber_should_receive_requested_elements()
{
var materializer = Sys.Materializer();
await this.AssertAllStagesStoppedAsync(async () =>
{
var actorRef = Source.From(new[] { 1, 2, 3 })
.RunWith(Sink.ActorSubscriber<int>(ManualSubscriber.Props(TestActor)), materializer);
await ExpectNoMsgAsync(200);
actorRef.Tell("ready"); //requesting 2
(await ExpectMsgAsync<OnNext>()).Element.Should().Be(1);
(await ExpectMsgAsync<OnNext>()).Element.Should().Be(2);
await ExpectNoMsgAsync(200);
actorRef.Tell("ready");
(await ExpectMsgAsync<OnNext>()).Element.Should().Be(3);
await ExpectMsgAsync<OnComplete>();
}, materializer);
}
[Fact]
public async Task ActorSubscriber_should_signal_error()
{
var materializer = Sys.Materializer();
await this.AssertAllStagesStoppedAsync(async () =>
{
var e = new Exception("simulated");
var actorRef = Source.FromEnumerator<int>(() => throw e)
.RunWith(Sink.ActorSubscriber<int>(ManualSubscriber.Props(TestActor)), materializer);
actorRef.Tell("ready");
(await ExpectMsgAsync<OnError>()).Cause.Should().Be(e);
}, materializer);
}
[Fact]
public async Task ActorSubscriberSpec_should_remember_requested_after_restart()
{
var materializer = Sys.Materializer();
await this.AssertAllStagesStoppedAsync(async () =>
{
// creating actor with default supervision, because stream supervisor default strategy is to
var actorRef = Sys.ActorOf(ManualSubscriber.Props(TestActor));
Source.From(Enumerable.Range(1, 7))
.RunWith(Sink.FromSubscriber(new ActorSubscriberImpl<int>(actorRef)), materializer);
actorRef.Tell("ready");
(await ExpectMsgAsync<OnNext>()).Element.Should().Be(1);
(await ExpectMsgAsync<OnNext>()).Element.Should().Be(2);
await ExpectNoMsgAsync(200);
actorRef.Tell("boom");
actorRef.Tell("ready");
actorRef.Tell("ready");
actorRef.Tell("boom");
foreach (var n in Enumerable.Range(3, 4))
{
(await ExpectMsgAsync<OnNext>()).Element.Should().Be(n);
}
await ExpectNoMsgAsync(200);
actorRef.Tell("ready");
(await ExpectMsgAsync<OnNext>()).Element.Should().Be(7);
await ExpectMsgAsync<OnComplete>();
}, materializer);
}
[Fact]
public async Task ActorSubscriberSpec_should_not_deliver_more_after_cancel()
{
var materializer = Sys.Materializer();
await this.AssertAllStagesStoppedAsync(async () =>
{
var actorRef = Source.From(Enumerable.Range(1, 5))
.RunWith(Sink.ActorSubscriber<int>(ManualSubscriber.Props(TestActor)), materializer);
actorRef.Tell("ready");
(await ExpectMsgAsync<OnNext>()).Element.Should().Be(1);
(await ExpectMsgAsync<OnNext>()).Element.Should().Be(2);
actorRef.Tell("requestAndCancel");
await ExpectNoMsgAsync(200);
}, materializer);
}
[Fact]
public async Task ActorSubscriberSpec_should_terminate_after_cancel()
{
var materializer = Sys.Materializer();
await this.AssertAllStagesStoppedAsync(async () =>
{
var actorRef = Source.From(Enumerable.Range(1, 5))
.RunWith(Sink.ActorSubscriber<int>(ManualSubscriber.Props(TestActor)), materializer);
Watch(actorRef);
actorRef.Tell("requestAndCancel");
await ExpectTerminatedAsync(actorRef);
}, materializer);
}
[Fact]
public async Task ActorSubscriberSpec_should_cancel_incoming_subscription_when_cancel_was_called_before_it_arrived()
{
var actorRef = Sys.ActorOf(ImmediatelyCancelledSubscriber.Props(TestActor));
var sub = new ActorSubscriberImpl<object>(actorRef);
Watch(actorRef);
await ExpectNoMsgAsync(200);
sub.OnSubscribe(new CancelSubscription(TestActor));
await ExpectMsgAsync("cancel");
await ExpectTerminatedAsync(actorRef, TimeSpan.FromMilliseconds(200));
}
[Fact]
public async Task ActorSubscriberSpec_should_work_with_OneByOneRequestStrategy()
{
var materializer = Sys.Materializer();
await this.AssertAllStagesStoppedAsync(async () =>
{
Source.From(Enumerable.Range(1, 17))
.RunWith(Sink.ActorSubscriber<int>(RequestStrategySubscriber.Props(TestActor, OneByOneRequestStrategy.Instance)), materializer);
foreach (var n in Enumerable.Range(1, 17))
{
(await ExpectMsgAsync<OnNext>()).Element.Should().Be(n);
}
await ExpectMsgAsync<OnComplete>();
}, materializer);
}
[Fact]
public async Task ActorSubscriberSpec_should_should_work_with_WatermarkRequestStrategy()
{
var materializer = Sys.Materializer();
await this.AssertAllStagesStoppedAsync(async () =>
{
Source.From(Enumerable.Range(1, 17))
.RunWith(Sink.ActorSubscriber<int>(RequestStrategySubscriber.Props(TestActor, new WatermarkRequestStrategy(highWatermark: 10))), materializer);
foreach (var n in Enumerable.Range(1, 17))
{
(await ExpectMsgAsync<OnNext>()).Element.Should().Be(n);
}
await ExpectMsgAsync<OnComplete>();
}, materializer);
}
[Fact]
public async Task ActorSubscriberSpec_should_support_custom_max_in_flight_request_strategy_with_child_workers()
{
var materializer = Sys.Materializer();
await this.AssertAllStagesStoppedAsync(async () =>
{
const int n = 117;
Source.From(Enumerable.Range(1, n))
.Select(i => new Msg(i, TestActor))
.RunWith(Sink.ActorSubscriber<Msg>(Streamer.Props), Sys.Materializer());
(await ReceiveNAsync(n).ToListAsync())
.Should().BeEquivalentTo(Enumerable.Range(1, n).Select(i => new Done(i)));
}, materializer);
}
}
internal class ManualSubscriber : ActorSubscriber
{
public static Props Props(IActorRef probe)
=> Akka.Actor.Props.Create(() => new ManualSubscriber(probe)).WithDispatcher("akka.test.stream-dispatcher");
private readonly IActorRef _probe;
public ManualSubscriber(IActorRef probe)
{
_probe = probe;
}
public override IRequestStrategy RequestStrategy { get; } = ZeroRequestStrategy.Instance;
protected override bool Receive(object message)
{
switch (message)
{
case OnNext msg:
_probe.Tell(msg);
return true;
case OnComplete msg:
_probe.Tell(msg);
return true;
case OnError msg:
_probe.Tell(msg);
return true;
case string s:
switch (s)
{
case "ready":
Request(2);
break;
case "boom":
throw new Exception(s);
case "requestAndCancel":
Request(1);
Cancel();
break;
case "cancel":
Cancel();
break;
}
return true;
default:
return false;
}
}
}
internal class ImmediatelyCancelledSubscriber : ManualSubscriber
{
public new static Props Props(IActorRef probe)
=> Akka.Actor.Props.Create(() => new ImmediatelyCancelledSubscriber(probe)).WithDispatcher("akka.test.stream-dispatcher");
public ImmediatelyCancelledSubscriber(IActorRef probe) : base(probe)
{
}
protected override void PreStart()
{
Cancel();
base.PreStart();
}
}
internal class RequestStrategySubscriber : ActorSubscriber
{
public static Props Props(IActorRef probe, IRequestStrategy strat)
=> Akka.Actor.Props.Create(() => new RequestStrategySubscriber(probe, strat)).WithDispatcher("akka.test.stream-dispatcher");
private readonly IActorRef _probe;
public RequestStrategySubscriber(IActorRef probe, IRequestStrategy strat)
{
_probe = probe;
RequestStrategy = strat;
}
protected override bool Receive(object message)
{
switch (message)
{
case OnNext msg:
_probe.Tell(msg);
return true;
case OnComplete msg:
_probe.Tell(msg);
return true;
default:
return false;
}
}
public override IRequestStrategy RequestStrategy { get; }
}
internal class CancelSubscription : ISubscription
{
private readonly IActorRef _probe;
public CancelSubscription(IActorRef probe)
{
_probe = probe;
}
public void Request(long n)
{
}
public void Cancel()
{
_probe.Tell("cancel");
}
}
internal abstract class IdBase
{
protected IdBase(int id)
{
Id = id;
}
public int Id { get; }
}
internal class Msg : IdBase
{
public Msg(int id, IActorRef replyTo) : base(id)
{
ReplyTo = replyTo;
}
public IActorRef ReplyTo { get; }
}
internal class Work : IdBase
{
public Work(int id) : base(id)
{
}
}
internal class Reply : IdBase
{
public Reply(int id) : base(id)
{
}
}
internal class Done : IdBase
{
public Done(int id) : base(id)
{
}
}
internal class Streamer : ActorSubscriber
{
public static Props Props { get; } = Props.Create<Streamer>().WithDispatcher("akka.test.stream-dispatcher");
private class InFlightStrategy : MaxInFlightRequestStrategy
{
private readonly Streamer _streamer;
public InFlightStrategy(Streamer streamer) : base(10)
{
_streamer = streamer;
}
public override int InFlight => _streamer._queue.Count;
}
private readonly Dictionary<int, IActorRef> _queue = new Dictionary<int, IActorRef>();
private readonly Router _router;
public Streamer()
{
RequestStrategy = new InFlightStrategy(this);
var routees = new[]
{
Routee.FromActorRef(Context.ActorOf(Props.Create<Worker>().WithDispatcher(Context.Props.Dispatcher))),
Routee.FromActorRef(Context.ActorOf(Props.Create<Worker>().WithDispatcher(Context.Props.Dispatcher))),
Routee.FromActorRef(Context.ActorOf(Props.Create<Worker>().WithDispatcher(Context.Props.Dispatcher)))
};
_router = new Router(new RoundRobinRoutingLogic(), routees);
}
public override IRequestStrategy RequestStrategy { get; }
protected override bool Receive(object message)
{
switch (message)
{
case OnNext next:
var msg = (Msg)next.Element;
_queue.Add(msg.Id, msg.ReplyTo);
if (_queue.Count > 10)
throw new InvalidOperationException($"queued too many: {_queue.Count}");
_router.Route(new Work(msg.Id), Self);
return true;
case Reply reply:
_queue[reply.Id].Tell(new Done(reply.Id));
_queue.Remove(reply.Id);
return true;
default:
return false;
}
}
}
internal class Worker : ReceiveActor
{
public Worker()
{
Receive<Work>(work => Sender.Tell(new Reply(work.Id)));
}
}
}