org.zeromq.ZMQException Java Examples

public void start() {
    routerSocket = context.createSocket(ZMQ.ROUTER);
    routerSocket.bind(String.format("tcp://%s:%d", bindHost, bindPort));

    serverThread = new Thread(new Runnable() {
        @Override
        public void run() {
            try {
                while (true) {
                    byte[] packet = routerSocket.recv();
                    if (Arrays.equals(packet, "testClient".getBytes())) {
                        routerSocket.sendMore(packet);
                        continue;
                    }
                    Message message = new Message(packet);
                    routerSocket.send(message.getBytes(), 0);
                }
            } catch (ZMQException ex) {
                // ignore ZMQException, it may be interrupted.
            } catch (IOException ex) {
                logger.error(ex.getMessage());
            }
        }
    });

    serverThread.start();
}
 

private byte[] getServerRPCResponse(String request) throws SizeLimitExceededException {


        byte[] finalRequest = this.dataCompressor.compressStringToBytes(request);

        if (finalRequest.length >= MAX_REQUEST_SIZE) {
            throw new SizeLimitExceededException(MessageFormat.format("Size of request is too large (limit is {0} bytes)", MAX_REQUEST_SIZE));
        }

        byte[] serverResponse;
        boolean success;

        synchronized (sendRequestMonitor) {
            if (connectionTimeout.get()) {
                return null;
            }
            try {
                success = requester.send(finalRequest);
            } catch (ZMQException e) {
                if (e.getErrorCode() == ZError.EFSM) {
                    success = resend(finalRequest);
                } else {
                    throw e;
                }
            }
            if (success) {
                serverResponse = requester.recv(0);
                if (serverResponse == null) {
                    if (requester.base().errno() == ZError.EAGAIN) {
                        int retries = timeout / INTERNAL_TIMEOUT;
                        while (serverResponse == null && retries > 0) {
                            if (connectionTimeout.get()) {
                                return null;
                            }

                            retries--;
                            serverResponse = requester.recv(0);
                        }
                        if (retries == 0 && resend(finalRequest)) {
                            serverResponse = requester.recv(0);
                        }
                    } else {
                        LOG.error("Error sending request");
                    }
                }
            } else {
                LOG.error("Error sending request");
                return null;
            }
        }

        return serverResponse == null
            ? null
            : dataCompressor.decompressBytesToString(serverResponse).getBytes();
    }
 

boolean createSockets() {
    ctx = new ZContext();
    String ip = (String) connectionData.get("ip");
    String transport = (String) connectionData.get("transport");
    try {
        // http://jupyter-client.readthedocs.org/en/latest/messaging.html#heartbeat-for-kernels 
        //
        //     Clients send ping messages on a REQ socket, which are echoed right back from the Kernel’s 
        //     REP socket. These are simple bytestrings, not full JSON messages described above.
        Heartbeat = ctx.createSocket(ZMQ.REP);
        Heartbeat.bind(String.format("%s://%s:%s",
                transport, ip, connectionData.get("hb_port")
        ));

        // http://jupyter-client.readthedocs.org/en/latest/messaging.html#introduction
        // Shell: this single ROUTER socket allows multiple incoming connections from frontends, and 
        //        this is the socket where requests for code execution, object information, prompts, etc. 
        //        are made to the kernel by any frontend. 
        String shellAddress = String.format("%s://%s:%s",
                transport, ip, connectionData.get("shell_port"));
        Shell = ctx.createSocket(ZMQ.ROUTER);
        Shell.bind(shellAddress);

        // Control: This channel is identical to Shell, but operates on a separate socket, to allow 
        //          important messages to avoid queueing behind execution requests (e.g. shutdown or abort).
        Control = ctx.createSocket(ZMQ.ROUTER);
        Control.bind(String.format("%s://%s:%s",
                transport, ip, connectionData.get("control_port")
        ));

        // IOPub: this socket is the ‘broadcast channel’ where the kernel publishes all side effects 
        //        (stdout, stderr, etc.) as well as the requests coming from any client over the shell socket 
        //        send its own requests on the stdin socket. 
        IOPub = ctx.createSocket(ZMQ.PUB);
        IOPub.bind(String.format("%s://%s:%s",
                transport, ip, connectionData.get("iopub_port")
        ));

        Stdin = ctx.createSocket(ZMQ.ROUTER);
        Stdin.connect(String.format("%s://%s:%s",
                transport, ip, connectionData.get("stdin_port")
        ));
    } catch (ZMQException e) {
        closeSockets();
        Logger.getLogger(Session.class.getName()).log(Level.SEVERE, null, e);
    }

    sockets = new ZMQ.Poller(4);
    sockets.register(Control, ZMQ.Poller.POLLIN);
    sockets.register(Heartbeat, ZMQ.Poller.POLLIN);
    sockets.register(Shell, ZMQ.Poller.POLLIN);
    sockets.register(Stdin, ZMQ.Poller.POLLIN);
    return true;
}