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

Example 16 with Socket

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

the class clonesrv4 method run.

public void run() {
    ZContext ctx = new ZContext();
    Socket snapshot = ctx.createSocket(ZMQ.ROUTER);
    snapshot.bind("tcp://*:5556");
    Socket publisher = ctx.createSocket(ZMQ.PUB);
    publisher.bind("tcp://*:5557");
    Socket collector = ctx.createSocket(ZMQ.PULL);
    collector.bind("tcp://*:5558");
    Poller poller = ctx.createPoller(2);
    poller.register(collector, Poller.POLLIN);
    poller.register(snapshot, Poller.POLLIN);
    long sequence = 0;
    while (!Thread.currentThread().isInterrupted()) {
        if (poller.poll(1000) < 0)
            //  Context has been shut down
            break;
        // apply state updates from main thread
        if (poller.pollin(0)) {
            kvsimple kvMsg = kvsimple.recv(collector);
            if (//  Interrupted
            kvMsg == null)
                break;
            kvMsg.setSequence(++sequence);
            kvMsg.send(publisher);
            clonesrv4.kvMap.put(kvMsg.getKey(), kvMsg);
            System.out.printf("I: publishing update %5d\n", sequence);
        }
        // execute state snapshot request
        if (poller.pollin(1)) {
            byte[] identity = snapshot.recv(0);
            if (identity == null)
                //  Interrupted
                break;
            //  .until
            //  Request is in second frame of message
            String request = snapshot.recvStr();
            if (!request.equals("ICANHAZ?")) {
                System.out.println("E: bad request, aborting");
                break;
            }
            String subtree = snapshot.recvStr();
            Iterator<Entry<String, kvsimple>> iter = kvMap.entrySet().iterator();
            while (iter.hasNext()) {
                Entry<String, kvsimple> entry = iter.next();
                kvsimple msg = entry.getValue();
                System.out.println("Sending message " + entry.getValue().getSequence());
                this.sendMessage(msg, identity, subtree, snapshot);
            }
            // now send end message with getSequence number
            System.out.println("Sending state snapshot = " + sequence);
            snapshot.send(identity, ZMQ.SNDMORE);
            kvsimple message = new kvsimple("KTHXBAI", sequence, ZMQ.SUBSCRIPTION_ALL);
            message.send(snapshot);
        }
    }
    System.out.printf(" Interrupted\n%d messages handled\n", sequence);
    ctx.destroy();
}

Example 17 with Socket

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

the class rrclient method main.

public static void main(String[] args) {
    Context context = ZMQ.context(1);
    //  Socket to talk to server
    Socket requester = context.socket(ZMQ.REQ);
    requester.connect("tcp://localhost:5559");
    System.out.println("launch and connect client.");
    for (int request_nbr = 0; request_nbr < 10; request_nbr++) {
        requester.send("Hello", 0);
        String reply = requester.recvStr(0);
        System.out.println("Received reply " + request_nbr + " [" + reply + "]");
    }
    requester.close();
    context.term();
}

Example 18 with Socket

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

the class syncpub method main.

public static void main(String[] args) {
    Context context = ZMQ.context(1);
    //  Socket to talk to clients
    Socket publisher = context.socket(ZMQ.PUB);
    publisher.setLinger(5000);
    // In 0MQ 3.x pub socket could drop messages if sub can follow the generation of pub messages
    publisher.setSndHWM(0);
    publisher.bind("tcp://*:5561");
    //  Socket to receive signals
    Socket syncservice = context.socket(ZMQ.REP);
    syncservice.bind("tcp://*:5562");
    System.out.println("Waiting subscribers");
    //  Get synchronization from subscribers
    int subscribers = 0;
    while (subscribers < SUBSCRIBERS_EXPECTED) {
        //  - wait for synchronization request
        syncservice.recv(0);
        //  - send synchronization reply
        syncservice.send("", 0);
        subscribers++;
    }
    //  Now broadcast exactly 1M updates followed by END
    System.out.println("Broadcasting messages");
    int update_nbr;
    for (update_nbr = 0; update_nbr < 1000000; update_nbr++) {
        publisher.send("Rhubarb", 0);
    }
    publisher.send("END", 0);
    // clean up
    publisher.close();
    syncservice.close();
    context.term();
}

Example 19 with Socket

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

the class lpserver method main.

public static void main(String[] argv) throws Exception {
    Random rand = new Random(System.nanoTime());
    Context context = ZMQ.context(1);
    Socket server = context.socket(ZMQ.REP);
    server.bind("tcp://*:5555");
    int cycles = 0;
    while (true) {
        String request = server.recvStr();
        cycles++;
        //  Simulate various problems, after a few cycles
        if (cycles > 3 && rand.nextInt(3) == 0) {
            System.out.println("I: simulating a crash");
            break;
        } else if (cycles > 3 && rand.nextInt(3) == 0) {
            System.out.println("I: simulating CPU overload");
            Thread.sleep(2000);
        }
        System.out.printf("I: normal request (%s)\n", request);
        //  Do some heavy work
        Thread.sleep(1000);
        server.send(request);
    }
    server.close();
    context.term();
}

Example 20 with Socket

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

the class ZPoller method dispatch.

/**
     * Dispatches the polled events.
     *
     * @param all   the items used for dispatching
     * @param size  the number of items to dispatch
     * @return true if correctly dispatched, false in case of error
     */
protected boolean dispatch(final Collection<ItemHolder> all, int size) {
    ItemHolder[] array = all.toArray(new ItemHolder[all.size()]);
    // protected against handlers unregistering during this loop
    for (ItemHolder holder : array) {
        EventsHandler handler = holder.handler();
        if (handler == null) {
            handler = globalHandler;
        }
        if (handler == null) {
            // no handler, short-circuit
            continue;
        }
        final zmq.PollItem item = holder.item();
        final int events = item.readyOps();
        if (events <= 0) {
            // no events, short-circuit
            continue;
        }
        final Socket socket = holder.socket();
        final SelectableChannel channel = holder.item().getRawSocket();
        if (socket != null) {
            assert (channel == null);
            // dispatch on socket
            if (!handler.events(socket, events)) {
                return false;
            }
        }
        if (channel != null) {
            // dispatch on channel
            assert (socket == null);
            if (!handler.events(channel, events)) {
                return false;
            }
        }
    }
    return true;
}