net动态添加子节点
本文关键字:子节点 添加 动态 net | 更新日期: 2023-09-27 18:04:27
有一个已配置的ActorSystem
,其actor按以下层次组织:
/user
/processes
/process1
/process2
/process3
要生成这个方案,我使用下面的c#代码:
// in entry point
IActorRef processesCoordinatorActorRef = ActorSystem.ActorOf(Props.Create<ProcessesCoordinatorActor>(), "processes");
// in ProcessesCoordinatorActor.cs:
IActorRef processOneActorRef = Context.ActorOf(Props.Create<ProccessActor>(), "process1");
IActorRef processTwoActorRef = Context.ActorOf(Props.Create<ProccessActor>(), "process2");
IActorRef processThreeActorRef = Context.ActorOf(Props.Create<ProccessActor>(), "process3");
我的问题是,我想从入口点代码(ProcessActor之外)添加一个子演员到process1
, process2
或process3
。但是现在我无能为力,因为IActorRef
向我隐藏了某些actor实例。
怎么解?
子角色必须在父角色的Context
中创建。如果你想从外部触发,只需给父进程发送一条消息,并让它创建子进程(例如CreateChildActor
)。没有办法在一个地方创建一个actor,然后让它被"采纳"为另一个actor的子actor。
一般来说(不知道你实际上在做什么),我的直觉是,从你的顶层/入口点代码向下创建参与者并不是一个好的方向。您应该让层次结构中的父角色完成创建和监督子角色的工作。
如果你必须从入口点触发此过程,你可以使用ActorSelection
将CreateChildActor
发送到层次结构中的任何地方,并且/或将其解析为IActorRef
。
下面的代码示例展示了如何做到这一点,并让子进程在准备好后通知协调器(这里也是作为Fiddle):
using System;
using System.Threading;
using Akka.Actor;
namespace ProcessActors
{
class Program
{
/// <summary>
/// Top-level process coordinator actor.
/// </summary>
public class ProcessesCoordinatorActor : ReceiveActor
{
public ProcessesCoordinatorActor()
{
Receive<CreateChildActor>(createRequest =>
{
Console.WriteLine("{0} creating child actor: {1}", Self.Path, createRequest.ChildName);
var child = Context.ActorOf(createRequest.ChildProps, createRequest.ChildName);
if (createRequest.ActorToNotify != null)
createRequest.ActorToNotify.Tell(new ReadyForWork(child));
});
Receive<ReadyForWork>(ready =>
{
Console.WriteLine("Coordinator sees worker ready: {0}", ready.Worker.Path);
});
ReceiveAny(o =>
{
Console.WriteLine("{0} received {1}", Self.Path, o);
});
}
}
/// <summary>
/// Actor for a given process.
/// </summary>
public class ProcessActor : ReceiveActor
{
public ProcessActor()
{
Receive<CreateChildActor>(createRequest =>
{
Console.WriteLine("{0} creating child actor: {1}", Self.Path, createRequest.ChildName);
var child = Context.ActorOf(createRequest.ChildProps, createRequest.ChildName);
if (createRequest.ActorToNotify != null)
createRequest.ActorToNotify.Tell(new ReadyForWork(child));
});
ReceiveAny(o =>
{
Console.WriteLine("{0} received {1}", Self.Path, o);
});
}
}
/// <summary>
/// Sub-process.
/// </summary>
public class SubprocessActor : ReceiveActor
{
public SubprocessActor()
{
ReceiveAny(o =>
{
Console.WriteLine("{0} received {1}", Self.Path, o);
});
}
}
public static void Main(string[] args)
{
using (var system = ActorSystem.Create("MyActorSystem"))
{
Console.WriteLine("Starting up.");
var coordinator = system.ActorOf(Props.Create(() => new ProcessesCoordinatorActor()), "processes");
var processProps = Props.Create(() => new ProcessActor());
// create process actors
coordinator.Tell(new CreateNewProcess("process1", processProps));
coordinator.Tell(new CreateNewProcess("process2", processProps));
coordinator.Tell(new CreateNewProcess("process3", processProps));
var subprocessProps = Props.Create(() => new SubprocessActor());
// tiny sleep to let everything boot
Thread.Sleep(TimeSpan.FromMilliseconds(50));
// get handle to an actor somewhere down in the hierarchy
var process1 = system.ActorSelection("/user/processes/process1").ResolveOne(TimeSpan.FromSeconds(1)).Result;
// create subprocess of process1 and notify the coordinator of new subprocess actor
process1.Tell(new CreateNewSubprocess("subprocess1", subprocessProps, coordinator));
Console.ReadLine();
}
}
#region Messages
/// <summary>
/// Command to create ChildProps actor and notify another actor about it.
/// </summary>
public class CreateChildActor
{
public CreateChildActor(string childName, Props childProps, IActorRef actorToNotify)
{
ChildName = childName;
ActorToNotify = actorToNotify;
ChildProps = childProps;
}
public CreateChildActor(string childName, Props childProps)
: this(childName, childProps, null)
{
}
public Props ChildProps { get; private set; }
public string ChildName { get; private set; }
public IActorRef ActorToNotify { get; private set; }
}
public class CreateNewProcess : CreateChildActor
{
public CreateNewProcess(string childName, Props childProps, IActorRef actorToNotify)
: base(childName, childProps, actorToNotify)
{
}
public CreateNewProcess(string childName, Props childProps)
: this(childName, childProps, null)
{
}
}
public class CreateNewSubprocess : CreateChildActor
{
public CreateNewSubprocess(string childName, Props childProps, IActorRef actorToNotify)
: base(childName, childProps, actorToNotify)
{
}
public CreateNewSubprocess(string childName, Props childProps)
: this(childName, childProps, null)
{
}
}
/// <summary>
/// Report to another actor when ready.
/// </summary>
public class ReadyForWork
{
public ReadyForWork(IActorRef worker)
{
Worker = worker;
}
public IActorRef Worker { get; private set; }
}
#endregion
}
}