This document provides an overview of Akka.NET, an actor model framework for .NET. It discusses how Akka.NET uses message passing between immutable messages to build distributed and concurrent applications. It also covers key Akka.NET concepts like actors, actor systems, supervision strategies, and plugins for clustering, persistence and remoting.

1. Akka.NET

5. class ConsoleWriterActor : UntypedActor
{
protected override void OnReceive(object message)
{
if (message is Messages.InputError)
{
var msg = message as Messages.InputError;
Console.ForegroundColor = ConsoleColor.Red;
Console.WriteLine(msg.Reason);
}
else
{
Console.WriteLine(message);
}
Console.ResetColor();
}
}

6. System = ActorSystem.Create("MyActorSystem");
var props = Props.Create<ConsoleWriterActor>();
var actor = System.ActorOf(props, "consoleWriterActor");
Creating the system & an actor

7. Messages are POCOs
Message-passing is asynchronous
Messages are immutable

8. actor.Tell("message");
Sending a message
Nothing more 

11. _consoleWriterActor.Tell(new Messages.NullInputError());
Sender.Tell(new Messages.ContinueProcessing());
Context.ActorSelection("akka://MyActorSystem/user/tailCoordinatorActor")
.Tell(new TailCoordinatorActor.StartTail(msg, _consoleWriterActor));
Communication between actors

14. protected override SupervisorStrategy SupervisorStrategy()
{
return new OneForOneStrategy(
10, // maxNumberOfRetries
TimeSpan.FromSeconds(30), // duration
x =>
{
if (x is ApplicationException)
return Directive.Escalate;
if (x is ArithmeticException)
return Directive.Resume;
if (x is NotSupportedException)
return Directive.Stop;
return Directive.Restart;
});
}
Supervision strategy

15. Asynchronous system
.WithDispatcher("akka.actor.synchronized-dispatcher")

16. Routers

17. Actors pool

18. Blocking actors
var getStarrer = _gitHubClient.Activity.Starring.GetAllForUser(starrer);
//ewww
getStarrer.Wait();
var starredRepos = getStarrer.Result;
Sender.Tell(new StarredReposForUser(starrer, starredRepos));

19. Async inside an actor
var sender = Sender;
var getStarrer = _gitHubClient.Activity.Starring.GetAllForUser(starrer);
getStarrer.ContinueWith<StarredReposForUser>(res =>
{
var starredRepos = getStarrer.Result;
return new StarredReposForUser(starrer, starredRepos
}).PipeTo(sender);

22. Plugins
Akka.Remote
Akka.Cluster
Akka.Persistence
Akka.TestKit

23. Yes, it scales

24. Resources
• http://getakka.net/
• https://github.com/akkadotnet/akka.net
• https://github.com/petabridge/akkadotnet-code-
samples
• https://petabridge.com/bootcamp/
• https://www.youtube.com/c/PetabridgeAcademy

25. 25

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