Akka:在演员系统之外进行沟通?
我有以下驱动程序/主类封装我的Akka程序:
// Groovy pseudo-code
class FizzBuzz {
ActorSystem actorSystem
static void main(String[] args) {
FizzBuzz d = new FizzBuzz()
d.run()
}
void run() {
Initialize initCmd = new Initialize()
MasterActor master = actorSystem.get(...)
// Tells the entire actor system to initialize itself and start doing stuff.
// ChickenCluckDetector is an actor managed/supervised by MasterActor.
master.tell(initCmd, ...)
}
// Called when a ChickenCluckDetector actor inside the actor system receives
// a 'Cluck' message.
void onChickenGoesCluck(Cluck cluck) {
// Do something
}
}
和以下ChickenCluckDetector
:
class ChickenCluckDetector extends UntypedActor {
@Override
void onReceive(Object message) {
if(message instanceof Cluck) {
Cluck cluck = message as Cluck
// Now, how to pass the message safely/properly to FizzBuzz#onCluck?
}
}
}
因此,在手头的问题是如何安全/妥善传递Cluck
消息FizzBuzz#onCluck(Cluck)
, 它生活在演员系统之外? 我可以像这样提供一个FizzBuzz
引用给ChickenCluckDetector
:
class ChickenCluckDetector extends UntypedActor {
FizzBuzz fizzBuzz
@Override
void onReceive(Object message) {
if(message instanceof Cluck) {
Cluck cluck = message as Cluck
fizzBuzz.onCluck(cluck)
}
}
}
但我有一种感觉,这违反了Akka的最佳实践,可能会导致各种基于并发的问题,尤其是如果只有一个FizzBuzz
(有)非演员/驱动程序和一万个ChickenCluckDetector
演员。 想法?
如果只有一个FizzBuzz(哪里有)非演员/司机,还有一万个ChickenCluckDetector演员
那么最好为所有这些ChickenCluckDetector创建一个共同的父项。 然后,这位家长可以安全地持有对FizzBuzz的引用,从他所有的孩子那里接收消息并调用onCluck方法。
向演员以外获取消息的一个选择是问。 在斯卡拉有演员DSL(为了完整而添加)。 但我相信在你的例子中你不需要这些。
public class ChickenCluckMaster extends UntypedActor {
private FizzBuzz fizzBuzz;
public ChickenCluckMaster(FizzBuzz fizzBuzz) {
this.fizzBuzz = fizzBuzz;
}
public void onReceive(Object message) throws Exception {
if (message instanceOf CreateDetector) {
getContext().actorOf(
Props.create(ChickenCluckDetector.class, getSelf); // Create child
} else if (message instanceof Cluck) {
fizzBuzz.onCluck(cluck);
} else {
unhandled(message);
}
}
}
public class ChickenCluckDetector extends UntypedActor {
private ActorRef master;
public ChickenCluckDetector(ActorRef master) {
this.master = master;
}
public void onReceive(Object message) throws Exception {
if (message instanceof Cluck) {
Cluck cluck = (Cluck) message;
master.tell(cluck, getSelf);
} else {
unhandled(message);
}
}
}
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