Examples with ZFrame org.zeromq.ZFrame used on opensource projects

Example 16 with ZFrame

use of org.zeromq.ZFrame in project jeromq by zeromq.

the class ppworker method worker_socket.

//  Helper function that returns a new configured socket
//  connected to the Paranoid Pirate queue
private static Socket worker_socket(ZContext ctx) {
    Socket worker = ctx.createSocket(ZMQ.DEALER);
    worker.connect("tcp://localhost:5556");
    //  Tell queue we're ready for work
    System.out.println("I: worker ready\n");
    ZFrame frame = new ZFrame(PPP_READY);
    frame.send(worker, 0);
    return worker;
}

Example 17 with ZFrame

use of org.zeromq.ZFrame in project jeromq by zeromq.

the class spqueue method main.

public static void main(String[] args) {
    ZContext ctx = new ZContext();
    Socket frontend = ctx.createSocket(ZMQ.ROUTER);
    Socket backend = ctx.createSocket(ZMQ.ROUTER);
    //  For clients
    frontend.bind("tcp://*:5555");
    //  For workers
    backend.bind("tcp://*:5556");
    //  Queue of available workers
    ArrayList<ZFrame> workers = new ArrayList<ZFrame>();
    Poller poller = ctx.createPoller(2);
    poller.register(backend, Poller.POLLIN);
    poller.register(frontend, Poller.POLLIN);
    //  The body of this example is exactly the same as lruqueue2.
    while (true) {
        boolean workersAvailable = workers.size() > 0;
        int rc = poller.poll(-1);
        //  Poll frontend only if we have available workers
        if (rc == -1)
            //  Interrupted
            break;
        //  Handle worker activity on backend
        if (poller.pollin(0)) {
            //  Use worker address for LRU routing
            ZMsg msg = ZMsg.recvMsg(backend);
            if (msg == null)
                //  Interrupted
                break;
            ZFrame address = msg.unwrap();
            workers.add(address);
            //  Forward message to client if it's not a READY
            ZFrame frame = msg.getFirst();
            if (new String(frame.getData(), ZMQ.CHARSET).equals(WORKER_READY))
                msg.destroy();
            else
                msg.send(frontend);
        }
        if (workersAvailable && poller.pollin(1)) {
            //  Get client request, route to first available worker
            ZMsg msg = ZMsg.recvMsg(frontend);
            if (msg != null) {
                msg.wrap(workers.remove(0));
                msg.send(backend);
            }
        }
    }
    //  When we're done, clean up properly
    while (workers.size() > 0) {
        ZFrame frame = workers.remove(0);
        frame.destroy();
    }
    workers.clear();
    ctx.destroy();
}

Example 18 with ZFrame

use of org.zeromq.ZFrame in project jeromq by zeromq.

the class spworker method main.

public static void main(String[] args) throws Exception {
    ZContext ctx = new ZContext();
    Socket worker = ctx.createSocket(ZMQ.REQ);
    //  Set random identity to make tracing easier
    Random rand = new Random(System.nanoTime());
    String identity = String.format("%04X-%04X", rand.nextInt(0x10000), rand.nextInt(0x10000));
    worker.setIdentity(identity.getBytes(ZMQ.CHARSET));
    worker.connect("tcp://localhost:5556");
    //  Tell broker we're ready for work
    System.out.printf("I: (%s) worker ready\n", identity);
    ZFrame frame = new ZFrame(WORKER_READY);
    frame.send(worker, 0);
    int cycles = 0;
    while (true) {
        ZMsg msg = ZMsg.recvMsg(worker);
        if (msg == null)
            //  Interrupted
            break;
        //  Simulate various problems, after a few cycles
        cycles++;
        if (cycles > 3 && rand.nextInt(5) == 0) {
            System.out.printf("I: (%s) simulating a crash\n", identity);
            msg.destroy();
            break;
        } else if (cycles > 3 && rand.nextInt(5) == 0) {
            System.out.printf("I: (%s) simulating CPU overload\n", identity);
            Thread.sleep(3000);
        }
        System.out.printf("I: (%s) normal reply\n", identity);
        //  Do some heavy work
        Thread.sleep(1000);
        msg.send(worker);
    }
    ctx.destroy();
}

Example 19 with ZFrame

use of org.zeromq.ZFrame in project jeromq by zeromq.

the class flserver2 method main.

public static void main(String[] args) {
    if (args.length < 1) {
        System.out.printf("I: syntax: flserver2 <endpoint>\n");
        System.exit(0);
    }
    ZContext ctx = new ZContext();
    Socket server = ctx.createSocket(ZMQ.REP);
    server.bind(args[0]);
    System.out.printf("I: echo service is ready at %s\n", args[0]);
    while (true) {
        ZMsg request = ZMsg.recvMsg(server);
        if (request == null)
            //  Interrupted
            break;
        //  Fail nastily if run against wrong client
        assert (request.size() == 2);
        ZFrame identity = request.pop();
        request.destroy();
        ZMsg reply = new ZMsg();
        reply.add(identity);
        reply.add("OK");
        reply.send(server);
    }
    if (Thread.currentThread().isInterrupted())
        System.out.printf("W: interrupted\n");
    ctx.destroy();
}

Example 20 with ZFrame

use of org.zeromq.ZFrame in project jeromq by zeromq.

the class flserver3 method main.

public static void main(String[] args) {
    boolean verbose = (args.length > 0 && args[0].equals("-v"));
    ZContext ctx = new ZContext();
    //  Prepare server socket with predictable identity
    String bindEndpoint = "tcp://*:5555";
    String connectEndpoint = "tcp://localhost:5555";
    Socket server = ctx.createSocket(ZMQ.ROUTER);
    server.setIdentity(connectEndpoint.getBytes(ZMQ.CHARSET));
    server.bind(bindEndpoint);
    System.out.printf("I: service is ready at %s\n", bindEndpoint);
    while (!Thread.currentThread().isInterrupted()) {
        ZMsg request = ZMsg.recvMsg(server);
        if (verbose && request != null)
            request.dump(System.out);
        if (request == null)
            //  Interrupted
            break;
        //  Frame 0: identity of client
        //  Frame 1: PING, or client control frame
        //  Frame 2: request body
        ZFrame identity = request.pop();
        ZFrame control = request.pop();
        ZMsg reply = new ZMsg();
        if (control.equals(new ZFrame("PING")))
            reply.add("PONG");
        else {
            reply.add(control);
            reply.add("OK");
        }
        request.destroy();
        reply.push(identity);
        if (verbose && reply != null)
            reply.dump(System.out);
        reply.send(server);
    }
    if (Thread.currentThread().isInterrupted())
        System.out.printf("W: interrupted\n");
    ctx.destroy();
}