Question

我是Akka的新手，根本不熟悉Scala。我正在尝试使用Akka + Java在多台机器上运行项目。我能够在本地成功运行Akka Java示例，但是当我尝试在两台机器上运行它们时，代码停止工作。我也查看了Akka-Sample-Remote源代码。它也可以在一台机器上运行，但在多台机器上使用时会中断。我认为问题在于我设置配置的方式。我已将问题总结为一个简单的HelloWorld问题，如下所示。

代码分为两个项目，两个独立的配置文件：Hello Actor项目和World Actor项目。 World Actor等待从Hello Actor接收Hello消息，然后打印出“Hello World”。在下面，您可以看到这两个项目的代码和配置。如您所见，World Actor在端口1719上启动，Hello Actor在端口1720上启动，并尝试使用“akka.tcp：//WorldApplication@192.27.336.187：1719 / user / WorldActor”连接到World Actor。关于代码/配置有什么问题的任何想法？

JWorld.java：

public class JWorld {

  public static void main(String[] args) {
    JWorldApplication app = new JWorldApplication();
    System.out.println("Started World Application - waiting for Hello message");
  }

}

JWorldApplication.java：

import akka.actor.ActorRef;

import akka.actor.ActorSystem;
import akka.actor.Props;
import com.typesafe.config.ConfigFactory;

public class JWorldApplication {
  private ActorSystem system;

  public JWorldApplication() {
    system = ActorSystem.create("WorldApplication", ConfigFactory.load()
        .getConfig("WorldConfig"));
    ActorRef actor = system.actorOf(new Props(JWorldActor.class),
        "WorldActor");
  }
}

JWolrdActor.java：

import akka.actor.UntypedActor;


public class JWorldActor extends UntypedActor {
    @Override
    public void onReceive(Object message) {

        if (message instanceof HelloMessage) {
            HelloMessage recMsg = (HelloMessage) message;
            System.out.println("Received Message: " + recMsg.getText());
            System.out.println("***** Hello World! ******" );
        } else {
            System.out.println("UnHandled Message Received" );
            unhandled(message);
        }
    }

}

HelloMessage.java：

import akka.actor.ActorRef; 

public class HelloMessage{
    private ActorRef receiver;
    private String text;
    HelloMessage() {}
    HelloMessage(ActorRef receiver){ this.receiver = receiver;}
    public ActorRef getReceiver(){ return receiver;}
    public void setText(String text) { this.text = text;}
    public String getText() {return text;}
}

Application.conf：

WorldConfig {
  actor {
    provider = "akka.remote.RemoteActorRefProvider"
  }

  remote {
    netty.tcp {
      hostname="192.27.336.187"
      port=1719
    }
  }
}

JHello.java：

public class JHello {

public static void main(String[] args) {
    JHelloApplication testApp = new JHelloApplication();
    System.out.println("Started Hello Application - Sending Hello Message");
    testApp.sayHello();


}
}

JHelloApplication.java：

import akka.actor.ActorRef;
import akka.actor.ActorSystem;
import akka.actor.Props;

import com.typesafe.config.ConfigFactory;

public class JHelloApplication {
    private ActorSystem system;
    private ActorRef remoteActor, myActor;

    public JHelloApplication() {
        system = ActorSystem.create("HelloApplication", ConfigFactory.load()
                .getConfig("HelloConfig"));
        myActor = system.actorOf(new Props(JHelloActor.class),"HelloActor");
        remoteActor = system
                .actorFor("akka.tcp://WorldApplication@192.27.336.187:1719/user/WorldActor");
    }

    public void sayHello() {
        myActor.tell(new HelloMessage(remoteActor));
    }

}

JHelloActor.java：

import akka.actor.ActorRef;
import akka.actor.UntypedActor;

public class JHelloActor extends UntypedActor {

    @Override
    public void onReceive(Object message) {
        if (message instanceof HelloMessage) {
            HelloMessage msg = (HelloMessage) message;
            if (msg.getReceiver() !=null){
                msg.setText("Hello");
                msg.getReceiver().tell(msg, getSelf());
            }
        } else {
            System.out.println("UnHandled Message Received" );
            unhandled(message);
        }
    }

}

application.conf：

HelloConfig {
  actor {
    provider = "akka.remote.RemoteActorRefProvider"
  }

  remote {
    netty.tcp {
      hostname="192.27.336.187"
      port=1720
    }
  }
}

Answer 1

如Patrcik所述，Patrik最终回答了Akka集团的问题。问题是两个配置文件中都缺少Akka {}标记。添加此标记可以解决问题。

使用Java的Akka远程连接

1 个答案: