//
// Multithreaded Hello World server in Java
//
// Arnaud Cogoluègnes <acogoluegnes@gmail.com>
//
import org.zeromq.ZMQ;
import org.zeromq.ZMQ.Context;
import org.zeromq.ZMQQueue;
public class mthwserver {
private static final class WorkerThread extends Thread {
private final ZMQ.Context context;
public WorkerThread(Context context) {
super();
this.context = context;
}
@Override
public void run() {
ZMQ.Socket receiver = context.socket(ZMQ.REP);
receiver.connect("inproc://workers");
while(!Thread.currentThread().isInterrupted()) {
byte[] request = receiver.recv (0);
// In order to display the 0-terminated string as a String,
// we omit the last byte from request
System.out.println ("Received request: [" +
new String(request,0,request.length-1) // Creates a String from request, minus the last byte
+ "]");
// Do some 'work'
try {
Thread.sleep (1000);
}
catch(InterruptedException e){
e.printStackTrace();
}
// Send reply back to client
// We will send a 0-terminated string (C string) back to the client,
// so that this server also works with The Guide's C and C++ "Hello World" clients
String replyString = "World" + " ";
byte[] reply = replyString.getBytes();
reply[reply.length-1]=0; //Sets the last byte of the reply to 0
receiver.send(reply, 0);
}
}
}
public static void main(String[] args) {
// Prepare our context and socket
ZMQ.Context context = ZMQ.context(1);
// Socket to talk to clients
ZMQ.Socket clients = context.socket(ZMQ.ROUTER);
clients.bind("tcp://*:5555");
// Socket to talk to workers
ZMQ.Socket workers = context.socket(ZMQ.DEALER);
workers.bind("inproc://workers");
// Launch worker threads
for(int threadNb = 0;threadNb < 5; threadNb++) {
new WorkerThread(context).start();
}
// Connect work threads to client threads via a queue
ZMQQueue queue = new ZMQQueue(context, clients, workers);
new Thread(queue).start();
}
}