Examples with Socket org.zeromq.ZMQ.Socket used on opensource projects

Example 51 with Socket

use of org.zeromq.ZMQ.Socket in project jeromq by zeromq.

the class peering3 method main.

//  The main task begins by setting-up all its sockets. The local frontend
//  talks to clients, and our local backend talks to workers. The cloud
//  frontend talks to peer brokers as if they were clients, and the cloud
//  backend talks to peer brokers as if they were workers. The state
//  backend publishes regular state messages, and the state frontend
//  subscribes to all state backends to collect these messages. Finally,
//  we use a PULL monitor socket to collect printable messages from tasks:
public static void main(String[] argv) {
    //
    if (argv.length < 1) {
        System.out.println("syntax: peering3 me {you}");
        System.exit(-1);
    }
    self = argv[0];
    System.out.printf("I: preparing broker at %s\n", self);
    Random rand = new Random(System.nanoTime());
    ZContext ctx = new ZContext();
    //  Prepare local frontend and backend
    Socket localfe = ctx.createSocket(ZMQ.ROUTER);
    localfe.bind(String.format("ipc://%s-localfe.ipc", self));
    Socket localbe = ctx.createSocket(ZMQ.ROUTER);
    localbe.bind(String.format("ipc://%s-localbe.ipc", self));
    //  Bind cloud frontend to endpoint
    Socket cloudfe = ctx.createSocket(ZMQ.ROUTER);
    cloudfe.setIdentity(self.getBytes(ZMQ.CHARSET));
    cloudfe.bind(String.format("ipc://%s-cloud.ipc", self));
    //  Connect cloud backend to all peers
    Socket cloudbe = ctx.createSocket(ZMQ.ROUTER);
    cloudbe.setIdentity(self.getBytes(ZMQ.CHARSET));
    int argn;
    for (argn = 1; argn < argv.length; argn++) {
        String peer = argv[argn];
        System.out.printf("I: connecting to cloud forintend at '%s'\n", peer);
        cloudbe.connect(String.format("ipc://%s-cloud.ipc", peer));
    }
    //  Bind state backend to endpoint
    Socket statebe = ctx.createSocket(ZMQ.PUB);
    statebe.bind(String.format("ipc://%s-state.ipc", self));
    //  Connect statefe to all peers
    Socket statefe = ctx.createSocket(ZMQ.SUB);
    statefe.subscribe(ZMQ.SUBSCRIPTION_ALL);
    for (argn = 1; argn < argv.length; argn++) {
        String peer = argv[argn];
        System.out.printf("I: connecting to state backend at '%s'\n", peer);
        statefe.connect(String.format("ipc://%s-state.ipc", peer));
    }
    //  Prepare monitor socket
    Socket monitor = ctx.createSocket(ZMQ.PULL);
    monitor.bind(String.format("ipc://%s-monitor.ipc", self));
    //  Start local workers
    int worker_nbr;
    for (worker_nbr = 0; worker_nbr < NBR_WORKERS; worker_nbr++) new worker_task().start();
    //  Start local clients
    int client_nbr;
    for (client_nbr = 0; client_nbr < NBR_CLIENTS; client_nbr++) new client_task().start();
    //  Queue of available workers
    int localCapacity = 0;
    int cloudCapacity = 0;
    ArrayList<ZFrame> workers = new ArrayList<ZFrame>();
    //  The main loop has two parts. First we poll workers and our two service
    //  sockets (statefe and monitor), in any case. If we have no ready workers,
    //  there's no point in looking at incoming requests. These can remain on
    //  their internal 0MQ queues:
    Poller primary = ctx.createPoller(4);
    primary.register(localbe, Poller.POLLIN);
    primary.register(cloudbe, Poller.POLLIN);
    primary.register(statefe, Poller.POLLIN);
    primary.register(monitor, Poller.POLLIN);
    Poller secondary = ctx.createPoller(2);
    secondary.register(localfe, Poller.POLLIN);
    secondary.register(cloudfe, Poller.POLLIN);
    while (true) {
        //  First, route any waiting replies from workers
        //  If we have no workers anyhow, wait indefinitely
        int rc = primary.poll(localCapacity > 0 ? 1000 : -1);
        if (rc == -1)
            //  Interrupted
            break;
        //  Track if capacity changes during this iteration
        int previous = localCapacity;
        //  Handle reply from local worker
        ZMsg msg = null;
        if (primary.pollin(0)) {
            msg = ZMsg.recvMsg(localbe);
            if (msg == null)
                //  Interrupted
                break;
            ZFrame address = msg.unwrap();
            workers.add(address);
            localCapacity++;
            //  If it's READY, don't route the message any further
            ZFrame frame = msg.getFirst();
            if (new String(frame.getData(), ZMQ.CHARSET).equals(WORKER_READY)) {
                msg.destroy();
                msg = null;
            }
        } else //  Or handle reply from peer broker
        if (primary.pollin(1)) {
            msg = ZMsg.recvMsg(cloudbe);
            if (msg == null)
                //  Interrupted
                break;
            //  We don't use peer broker address for anything
            ZFrame address = msg.unwrap();
            address.destroy();
        }
        //  Route reply to cloud if it's addressed to a broker
        for (argn = 1; msg != null && argn < argv.length; argn++) {
            byte[] data = msg.getFirst().getData();
            if (argv[argn].equals(new String(data, ZMQ.CHARSET))) {
                msg.send(cloudfe);
                msg = null;
            }
        }
        //  Route reply to client if we still need to
        if (msg != null)
            msg.send(localfe);
        if (primary.pollin(2)) {
            String peer = statefe.recvStr();
            String status = statefe.recvStr();
            cloudCapacity = Integer.parseInt(status);
        }
        if (primary.pollin(3)) {
            String status = monitor.recvStr();
            System.out.println(status);
        }
        while (localCapacity + cloudCapacity > 0) {
            rc = secondary.poll(0);
            assert (rc >= 0);
            if (secondary.pollin(0)) {
                msg = ZMsg.recvMsg(localfe);
            } else if (localCapacity > 0 && secondary.pollin(1)) {
                msg = ZMsg.recvMsg(cloudfe);
            } else
                //  No work, go back to backends
                break;
            if (localCapacity > 0) {
                ZFrame frame = workers.remove(0);
                msg.wrap(frame);
                msg.send(localbe);
                localCapacity--;
            } else {
                //  Route to random broker peer
                int random_peer = rand.nextInt(argv.length - 1) + 1;
                msg.push(argv[random_peer]);
                msg.send(cloudbe);
            }
        }
        if (localCapacity != previous) {
            //  We stick our own address onto the envelope
            statebe.sendMore(self);
            //  Broadcast new capacity
            statebe.send(String.format("%d", localCapacity), 0);
        }
    }
    //  When we're done, clean up properly
    while (workers.size() > 0) {
        ZFrame frame = workers.remove(0);
        frame.destroy();
    }
    ctx.destroy();
}

Example 52 with Socket

use of org.zeromq.ZMQ.Socket 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 53 with Socket

use of org.zeromq.ZMQ.Socket in project jeromq by zeromq.

the class rrbroker method main.

public static void main(String[] args) {
    //  Prepare our context and sockets
    Context context = ZMQ.context(1);
    Socket frontend = context.socket(ZMQ.ROUTER);
    Socket backend = context.socket(ZMQ.DEALER);
    frontend.bind("tcp://*:5559");
    backend.bind("tcp://*:5560");
    System.out.println("launch and connect broker.");
    //  Initialize poll set
    Poller items = context.poller(2);
    items.register(frontend, Poller.POLLIN);
    items.register(backend, Poller.POLLIN);
    boolean more = false;
    byte[] message;
    //  Switch messages between sockets
    while (!Thread.currentThread().isInterrupted()) {
        //  poll and memorize multipart detection
        items.poll();
        if (items.pollin(0)) {
            while (true) {
                // receive message
                message = frontend.recv(0);
                more = frontend.hasReceiveMore();
                // Broker it
                backend.send(message, more ? ZMQ.SNDMORE : 0);
                if (!more) {
                    break;
                }
            }
        }
        if (items.pollin(1)) {
            while (true) {
                // receive message
                message = backend.recv(0);
                more = backend.hasReceiveMore();
                // Broker it
                frontend.send(message, more ? ZMQ.SNDMORE : 0);
                if (!more) {
                    break;
                }
            }
        }
    }
    //  We never get here but clean up anyhow
    frontend.close();
    backend.close();
    context.term();
}

Example 54 with Socket

use of org.zeromq.ZMQ.Socket in project jeromq by zeromq.

the class rrworker method main.

public static void main(String[] args) throws Exception {
    Context context = ZMQ.context(1);
    //  Socket to talk to server
    Socket responder = context.socket(ZMQ.REP);
    responder.connect("tcp://localhost:5560");
    while (!Thread.currentThread().isInterrupted()) {
        //  Wait for next request from client
        String string = responder.recvStr(0);
        System.out.printf("Received request: [%s]\n", string);
        //  Do some 'work'
        Thread.sleep(1000);
        //  Send reply back to client
        responder.send("World");
    }
    //  We never get here but clean up anyhow
    responder.close();
    context.term();
}

Example 55 with Socket

use of org.zeromq.ZMQ.Socket in project jeromq by zeromq.

the class rtdealer method main.

/**
     * While this example runs in a single process, that is just to make
     * it easier to start and stop the example. Each thread has its own
     * context and conceptually acts as a separate process.
     */
public static void main(String[] args) throws Exception {
    Context context = ZMQ.context(1);
    Socket broker = context.socket(ZMQ.ROUTER);
    broker.bind("tcp://*:5671");
    for (int workerNbr = 0; workerNbr < NBR_WORKERS; workerNbr++) {
        Thread worker = new Worker();
        worker.start();
    }
    //  Run for five seconds and then tell workers to end
    long endTime = System.currentTimeMillis() + 5000;
    int workersFired = 0;
    while (true) {
        //  Next message gives us least recently used worker
        String identity = broker.recvStr();
        broker.sendMore(identity);
        //  Envelope delimiter
        broker.recv(0);
        //  Response from worker
        broker.recv(0);
        broker.sendMore("");
        //  Encourage workers until it's time to fire them
        if (System.currentTimeMillis() < endTime)
            broker.send("Work harder");
        else {
            broker.send("Fired!");
            if (++workersFired == NBR_WORKERS)
                break;
        }
    }
    broker.close();
    context.term();
}