ZeroMQ (Java) publish/subscribe mode

The previous article introduced the simpler Request/subscribe mode, this article introduces the more classical Publish/subscribe communication mode used to zeromq the implementation, its communication method is as follows figure:

The client (subscriber) subscribes to the server (publisher), and the server can then push the message to all clients that subscribe to the message, which can also be understood as broadcast bar ....

Well, gossip does not say much, directly on the use of ZEROMQ to implement this communication mode code:

(1) server side (publisher):[Java] view plaincopy package pubsub;         import org.zeromq.zmq;       public class publisher {       public  Static void main (string args[])  {                   zmq. Context context = zmq.context (1);   //Create a context   that contains an I/O thread          zmq. Socket publisher = context.socket (ZMQ. PUB);    //creates a publisher-type socket that he can broadcast data         to all subscribed subscriber                publisher.bind ("tcp://* : 5555 ");   //bind current publisher to Port 5555 to accept Subscriber subscriptions                        while  (! Thread.currentthread  () .isinterrupted  ())  {                String message =  "Fjs hello"   //the first can be understood as pub channel, Subscribe need to subscribe to FJS this channel to receive messages                 publisher.send (Message.getbytes ());           }               publisher.close ();            context.term ();       }  }   

The code is very simple, here Publisher to serve as the server, all subscriber need to build a connection to Publisher. ，，。 ，

(2) Client (subscriber) code:[Java] view plaincopy package pubsub;      import org.zeromq.zmq;       public class subscriber {       public static void  main (string args[])  {           for  (int  j = 0; j < 100; j++)  {                new thread (new runnable () {                       public void  run ()  {                        // TODO Auto-generated method stub                        zMq. Context context = zmq.context (1);   //Create 1 I/O threads context                         zmq. Socket subscriber = context.socket (ZMQ. Sub);      //creates a sub type, which is the subscriber type of socket                         Subscriber.connect ("tcp://127.0.0.1:5555")     //connection with Publisher listening on port 5555                         subscriber.subscribe ("Fjs". GetBytes ());      //Subscribe FJS this channel