[英]How to use Patterns.askWithReplyTo in Akka Java
我正在尋找如何使用 Java 使用 Akka 模式Patterns.askWithReplyTo
的示例。
Github 上提供了一個示例項目: https : //github.com/pcdhan/akka-patterns.git
我的挑戰是我無法在有效負載中包含發件人的 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
並不意味着將發送者self
傳遞到消息中。
askWithReplyTo
期望你給它一個工廠函數,它被喂給臨時響應actor,所以如果你有一個可以像這樣構造的消息:
new MyMessage(ActorRef replyTo)
您可以像這樣將其與askWithReplyTo
一起使用:
final Future<Object> f = Patterns.askWithReplyTo(
otherActor,
replyTo -> new MyMessage(replyTo),
timeout);
第二個參數是一個 lambda,它將與臨時 ask-actor 一起調用(它總是在您要求處理響應超時時創建),以便您可以將它包含在消息中。
該模式僅在接收方使用該replyTo
字段進行響應而不是sender()
時才有用,這是您通常用來響應的方式。
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