如何在ZeroMQ（jzmq）3.xx中使用XPUB和XSUB通过代理实现Pub-Sub网络

Question

我正在尝试使用XPUB和XSUB来实现，如下图所示。我已经仔细阅读了所提供的示例，但在Java中无法获得XPUB和XSUB的示例。在这里，他们给出了一个用C编写的示例，该示例有点复杂，因为我是ZeroMQ的新手。

我正在尝试使用jni包装版本在android中使用它。请帮助我找到一个示例，说明如何使用Java在ZeroMQ中使用代理实现此Pub-Sub网络。

目前，我指的是http://zguide.zeromq.org/page:all

我尝试将其移植如下。 Subscriber.java

公共类订户扩展了线程实现Runnable {


private static final String TAG = "Subscriber";
private Context ctx;

public Subscriber(ZMQ.Context z_context) {
    this.ctx = z_context;
}

@Override
public void run() {

    super.run();

    ZMQ.Socket mulServiceSubscriber = ctx.socket(ZMQ.SUB);
    mulServiceSubscriber.connect("tcp://localhost:6001");
    mulServiceSubscriber.subscribe("A".getBytes());
    mulServiceSubscriber.subscribe("B".getBytes()); 


        while (true) {
            Log.d(TAG, "Subscriber loop started..");
            String content = new String(mulServiceSubscriber.recv(0));
            Log.d(TAG, "Subscriber Received : "+content);
        }
}


}

Publisher.java

公共类Publisher扩展了Thread实现Runnable {


private static final String TAG = "Publisher";
private Context ctx;

public Publisher(ZMQ.Context z_context) {
    this.ctx = z_context;
}

@Override
public void run() {

    super.run();

    ZMQ.Socket publisher = ctx.socket(ZMQ.PUB);
    publisher.connect("tcp://localhost:6000");

    while (true) {
        Log.d(TAG, "Publisher loop started..");
        publisher.send(("A Hello " + new Random(100).nextInt()).getBytes() , 0);
        try {
            Thread.sleep(1000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}


}

XListener.java（现在是一个简单的转发器）

公共类XListener扩展Thread实现Runnable {


private static final String TAG = null;
private Socket publisherX;
private Context ctx;
private Socket subscriberX;

public XListener(ZMQ.Context ctx, ZMQ.Socket subscriberX,
        ZMQ.Socket publisherX) {
    this.ctx = ctx;
    this.subscriberX = subscriberX;
    this.publisherX = publisherX;

}

@Override
public void run() {
    super.run();
    while (true) {          
        Log.d(TAG, "XListener loop started..");

        String msg = new String(subscriberX.recvStr());
        Log.v(TAG, "Listener Received: " +"MSG :"+msg);
        publisherX.send(msg.getBytes(), 0);         
    }
}


}

在应用程序中main（）

私人void main（）{
        ZMQ.Context ctx = ZMQ.context（1）;   


    ZMQ.Socket subscriberX = ctx.socket(ZMQ.XSUB);
    subscriberX.bind("tcp://*:6000");
    try {
        Thread.sleep(500);
    } catch (InterruptedException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    ZMQ.Socket publisherX = ctx.socket(ZMQ.XPUB);
    publisherX.bind("tcp://*:6001");
    try {
        Thread.sleep(500);
    } catch (InterruptedException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

    new XListener(ctx, subscriberX, publisherX).start();
    try {
        Thread.sleep(500);
    } catch (InterruptedException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

   new XSender(ctx, subscriberX, publisherX).start();
    try {
        Thread.sleep(500);
    } catch (InterruptedException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    new Subscriber(ctx).start();
    new Publisher(ctx).start();
}

使用该代码，我无法收听XSUB。移植espresso.c时，我无法在ZMQ的Java绑定中找到任何包装。如何实现一个简单的代理，或者我缺少什么？

Answer 1

哇我正在回答我自己的问题。我错过了添加从publisherX到subscriberX的转发器。这是缺少的代码。现在XSUB和XPUB可以发送和获取数据了。

公共类 XSender 扩展 Thread 实现 Runnable {


private static final String TAG = null;
private Socket publisherX;
private Context ctx;
private Socket subscriberX;

public XSender(ZMQ.Context ctx, ZMQ.Socket subscriberX,
        ZMQ.Socket publisherX) {
    this.ctx = ctx;
    this.subscriberX = subscriberX;
    this.publisherX = publisherX;

}

@Override
public void run() {
    super.run();
    while (true) {
        // Read envelope with address
        Log.d(TAG, "XListener loop started..");

        String msg = new String(subscriberX.recv(0));
        Log.v(TAG, "Listener Received: " +"MSG :"+msg);
        publisherX.send(msg.getBytes(), 0);         

    }


}


}