akka.net
TRANSCRIPT
Akka.NET
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();}
}
System = ActorSystem.Create("MyActorSystem");
var props = Props.Create<ConsoleWriterActor>();
var actor = System.ActorOf(props, "consoleWriterActor");
Creating the system & an actor
Messages are POCOs
Message-passing is asynchronous
Messages are immutable
actor.Tell("message");
Sending a message
Nothing more
_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
protected override SupervisorStrategy SupervisorStrategy(){
return new OneForOneStrategy(10, // maxNumberOfRetriesTimeSpan.FromSeconds(30), // durationx =>{
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
Asynchronous system
.WithDispatcher("akka.actor.synchronized-dispatcher")
Routers
Actors pool
Blocking actors
var getStarrer = _gitHubClient.Activity.Starring.GetAllForUser(starrer);
//ewww
getStarrer.Wait();
var starredRepos = getStarrer.Result;
Sender.Tell(new StarredReposForUser(starrer, starredRepos));
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);
Plugins
Akka.Remote
Akka.Cluster
Akka.Persistence
Akka.TestKit
Yes, it scales
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
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