[英]AKKA.Net: How to send message from supervisor to child on Actor Restart
考慮到這段代碼:
public class ParentActor : ReceiveActor
{
public ParentActor()
{
for( i = 1; i <= 5; i++)
var childActor = Context.ActorOf<ChildActor>($"Child{i}");
childActor.Tell( new LoadData(i));
}
}
public class ChildActor : ReceiveActor
{
public ChildActor()
{
Receive<LoadData>(msg =>
{
var data = SomeRiskyOverNetworkCall(msg.AccountId);
});
}
}
public class LoadData
{
public int AccountId { get; }
public LoadData(int accountId)
{
AccountId = accountId;
}
}
子actor執行一些有時會失敗的危險操作調用正在使用一些參數,這些參數是在創建子actor之后從父/監督actor傳遞的。
如何“監督”這種情況? 我需要在重啟后處理相同的LoadData
(具有相同參數)消息。
您可以將預重啟掛鈎與一些主管策略一起使用。 下面是一個簡單的例子。 https://getakka.net/articles/actors/fault-tolerance.html#creating-a-supervisor-strategy
using System;
using System.Threading;
using Akka.Actor;
namespace AkkaConsoleSimple
{
public class Start
{
public Start()
{
}
}
public class DoSomething
{
public DoSomething(int who)
{
Who = who;
}
public int Who { get; private set; }
}
public class FailedMessage
{
public FailedMessage(object who)
{
Who = who;
}
public object Who { get; private set; }
}
public class Child : ReceiveActor
{
public Child()
{
Receive<DoSomething>(msg =>
{
Console.WriteLine($"getting message no {msg.Who}");
if (msg.Who == 10)
{
throw new StackOverflowException();
}
});
}
protected override void PreRestart(Exception cause, object message)
{
Sender.Tell(new FailedMessage(message));
Self.Tell(message);
base.PreRestart(cause, message);
}
}
public class Parent : ReceiveActor
{
public Parent()
{
Receive<Start>(greet =>
{
var child = Context.ActorOf<Child>();
for (int i = 0; i < 11; i++)
{
var msg = new DoSomething(i);
child.Tell(msg);
}
});
Receive<FailedMessage>(failed => Console.WriteLine(failed.Who));
}
protected override SupervisorStrategy SupervisorStrategy()
{
return new OneForOneStrategy(
maxNrOfRetries: 10,
withinTimeRange: TimeSpan.FromMinutes(1),
localOnlyDecider: ex =>
{
switch (ex)
{
case StackOverflowException ae:
return Directive.Restart;
default:
return Directive.Escalate;
}
});
}
}
class Program
{
static void Main(string[] args)
{
var system = ActorSystem.Create("MySystem");
var greeter = system.ActorOf<Parent>("parent");
greeter.Tell(new Start());
Console.Read();
}
}
}
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