[英]How to use Patterns.askWithReplyTo in Akka Java
我正在寻找如何使用 Java 使用 Akka 模式Patterns.askWithReplyTo
的示例。
Github 上提供了一个示例项目: https : //github.com/pcdhan/akka-patterns.git
我的挑战是我无法在有效负载中包含发件人的 ActorRef。
ActorRef localA= system.actorOf(LocalActor.props(), "localA");
Timeout timeout = new Timeout(10000, TimeUnit.MILLISECONDS);
ActorSelection actorSelection=system.actorSelection("akka.tcp://ClusterSystem@localhost:2551/user/ActorA");
Future<Object> future = Patterns.ask(actorSelection, new Identify(""), timeout);
ActorIdentity reply = (ActorIdentity) Await.result(future, timeout.duration());
ActorRef actorRef = reply.ref().get(); //my remote actor ref
Payload payload = new Payload(); //How do I pass localA here
payload.setMsg("0");
Future<Object> askWithSenderRef =
Patterns.askWithReplyTo(actorRef,payload,20000L);
Payload responsePayload = (Payload) Await.result(askWithSenderRef,
timeout.duration());
System.out.println("Response from Remote Actor Payload: "+responsePayload.getMsg());
public class Payload implements Function<ActorRef, Object>, Serializable {
private static final long serialVersionUID = 1L;
String msg;
public String getMsg() {
return msg;
}
public void setMsg(String msg) {
this.msg = msg;
}
@Override
public Object apply(ActorRef param) throws Exception {
return this;
}
}
...Actor[akka.tcp://ClusterSystem@localhost:53324/temp/$d]
...Actor[akka.tcp://ClusterSystem@localhost:53324/temp/$e]
askWithReplyTo
并不意味着将发送者self
传递到消息中。
askWithReplyTo
期望你给它一个工厂函数,它被喂给临时响应actor,所以如果你有一个可以像这样构造的消息:
new MyMessage(ActorRef replyTo)
您可以像这样将其与askWithReplyTo
一起使用:
final Future<Object> f = Patterns.askWithReplyTo(
otherActor,
replyTo -> new MyMessage(replyTo),
timeout);
第二个参数是一个 lambda,它将与临时 ask-actor 一起调用(它总是在您要求处理响应超时时创建),以便您可以将它包含在消息中。
该模式仅在接收方使用该replyTo
字段进行响应而不是sender()
时才有用,这是您通常用来响应的方式。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.