子actor必须在Context
父actor中创建。如果您想从外部触发这种情况,只需向父级发送一条消息并让它创建子actor(例如CreateChildActor
)。没有办法在一个地方创建一个演员,然后让它作为另一个演员的孩子被“收养”。
通常(并且不知道您实际上要做什么),我的直觉是从您的顶级/入口点代码的层次结构中创建演员对您来说不是一个好的方向。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。
如果您必须从入口点触发此过程,您可以CreateChildActor
使用 anActorSelection
和/或将其解析为IActorRef
.
这是一个代码示例,展示了如何执行此操作,并让子流程在准备好后通知协调器(这里也作为 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
}
}