Example usage for com.rabbitmq.client Connection createChannel

Introduction

In this page you can find the example usage for com.rabbitmq.client Connection createChannel.

Prototype

Channel createChannel() throws IOException;

Source Link

Document

Create a new channel, using an internally allocated channel number.

Usage

From source file:com.vmware.bdd.utils.RabbitMQConsumer.java

License:Open Source License

/**
 * Receive and process each message until the listener indicating. A new
 * queue will be created when start and will be deleted when stopping
 * receiving message.//from w ww  .  ja  v  a2 s  .  com
 * 
 * FIXME Is it a best practice to create one queue for one task? Or we should
 * create one thread to handle all messages?
 * 
 * @param listener
 *           message processor callback
 * @throws IOException
 */
public void processMessage(MessageListener listener) throws IOException {
    ConnectionFactory factory = new ConnectionFactory();
    if (username != null && !username.equals("")) {
        factory.setUsername(username);
        factory.setPassword(password);
    }
    factory.setVirtualHost("/");
    factory.setHost(host);
    factory.setPort(port);

    Connection conn = factory.newConnection();
    Channel channel = conn.createChannel();

    /**
     * make exchange and queue non-durable
     */
    channel.exchangeDeclare(exchangeName, "direct", true);
    if (!getQueue) {
        channel.queueDeclare(queueName, false, true, true, null);
    } else {
        queueName = channel.queueDeclare().getQueue();
    }
    channel.queueBind(queueName, exchangeName, routingKey);

    boolean noAck = false;
    QueueingConsumer consumer = new QueueingConsumer(channel);
    channel.basicConsume(queueName, noAck, consumer);

    while (true) {
        QueueingConsumer.Delivery delivery;
        try {
            delivery = consumer.nextDelivery(mqRecvTimeoutMs);
        } catch (InterruptedException e) {
            logger.warn("message consumer interrupted", e);
            continue;
        }

        if (delivery == null) {
            logger.debug("timeout, no message received");
            if (stopping && new Date().after(mqExpireTime)) {
                logger.error("stop receiving messages without normal termination");
                break;
            }
            continue;
        }

        String message = new String(delivery.getBody());
        if (graceStopping) {
            extendExpirationTime();
        }

        logger.info("message received: " + message);
        try {
            if (!listener.onMessage(message)) {
                logger.info("stop receiving messages normally");
                break;
            }
        } catch (Throwable t) {
            logger.error("calling message listener failed", t);
            // discard and continue in non-debug mode
            AuAssert.unreachable();
        }
        channel.basicAck(delivery.getEnvelope().getDeliveryTag(), false);
    }

    try {
        channel.queueDelete(queueName);
    } catch (AlreadyClosedException e) {
        logger.error("failed to delete queue: " + queueName, e);
    }

    try {
        channel.close();
    } catch (AlreadyClosedException e) {
        logger.error("failed to close channel, queue: " + queueName, e);
    }

    try {
        conn.close();
    } catch (AlreadyClosedException e) {
        logger.error("failed to close connection, queue: " + queueName, e);
    }
}

---

From source file:com.vmware.vhadoop.adaptor.rabbit.RabbitConnection.java

License:Open Source License

QueueingConsumer getConsumer() {
    try {//from   ww  w  . ja  va 2 s .  c o  m
        Connection connection = _connectionFactory.newConnection();
        _channel = connection.createChannel();

        String exchangeName = _credentials.getExchangeName();
        _channel.exchangeDeclare(exchangeName, "direct", true, false, null); /* TODO: Externalize? */
        String queueName = _channel.queueDeclare().getQueue();
        _channel.queueBind(queueName, exchangeName, _credentials.getRouteKeyCommand());

        QueueingConsumer consumer = new QueueingConsumer(_channel);
        _channel.basicConsume(queueName, true, consumer);
        return consumer;

    } catch (Exception e) {
        throw new RuntimeException("Unable to get message consumer", e);
    }
}

---

From source file:com.vmware.vhadoop.vhm.rabbit.RabbitConnection.java

License:Open Source License

private Channel getChannel() throws IOException {
    synchronized (_channelLock) {
        if (_channel == null || !_channel.isOpen()) {
            _log.fine("Creating new channel");
            _channel = null;//from   w w w .  ja v  a 2  s . c o m
            Connection connection = getConnection();
            _channel = connection.createChannel();
            _channel.addShutdownListener(new ShutdownListener() {
                @Override
                public void shutdownCompleted(ShutdownSignalException cause) {
                    _log.info("Channel shut down");
                    _log.log(Level.FINE, "{0}", cause.getReason());
                    synchronized (_channelLock) {
                        _channel = null;
                        _queueName = null;
                    }
                    _started = false;
                }
            });
        }

        return _channel;
    }
}

---

From source file:com.wakkir.rabbitmq.basic.Reciever.java

public static void main(String[] argv) throws Exception {

    ConnectionFactory factory = new ConnectionFactory();
    factory.setHost("localhost");
    Connection connection = factory.newConnection();
    Channel channel = connection.createChannel();

    channel.queueDeclare(QUEUE_NAME, false, false, false, null);
    System.out.println(" [*] Waiting for messages. To exit press CTRL+C");

    QueueingConsumer consumer = new QueueingConsumer(channel);
    channel.basicConsume(QUEUE_NAME, true, consumer);

    while (true) {
        QueueingConsumer.Delivery delivery = consumer.nextDelivery();
        String message = new String(delivery.getBody(), "UTF-8");
        System.out.println(" [x] Received '" + message + "'");
    }// w ww .j  a va 2s.com
}

---

From source file:com.wakkir.rabbitmq.basic.Sender.java

public static void main(String[] argv) throws Exception {

    ConnectionFactory factory = new ConnectionFactory();
    factory.setHost("localhost");
    Connection connection = factory.newConnection();
    Channel channel = connection.createChannel();

    channel.queueDeclare(QUEUE_NAME, false, false, false, null);
    String message = "Hello World!";
    channel.basicPublish("", QUEUE_NAME, null, message.getBytes("UTF-8"));
    System.out.println(" [x] Sent '" + message + "'");

    channel.close();/*from   w  ww .  j a v  a 2s. c  om*/
    connection.close();
}

---

From source file:com.wss.qvh.log.ConsumerThread.java

public void consumer() throws IOException, TimeoutException {
    ConnectionFactory factory = new ConnectionFactory();
    factory.setUsername(Constant.RABBITMQ_USERNAME);
    factory.setPassword(Constant.RABBITMQ_PASSWORD);
    factory.setVirtualHost(Constant.RABBITMQ_VIRTUAL_HOST);
    factory.setRequestedChannelMax(Constant.NUM_PRODUCER);
    factory.setHost(Constant.RABBITMQ_HOST);

    Connection connection = factory.newConnection();
    Channel channel = connection.createChannel();

    channel.queueDeclare(Constant.QUEUE_NAME, Constant.QUEUE_DURABLE, false, false, null);
    channel.basicQos(Constant.QUEUE_PREFETCH);
    QueueingConsumer consumer = new QueueingConsumer(channel);
    boolean autoAck = false;
    channel.basicConsume(Constant.QUEUE_NAME, autoAck, consumer);

    while (true) {
        QueueingConsumer.Delivery delivery;
        try {/*  w ww  .  j a  v a2 s  .  co m*/
            delivery = consumer.nextDelivery();
        } catch (InterruptedException | ShutdownSignalException | ConsumerCancelledException ex) {
            logger.warn(ex.getMessage(), ex);
            try {
                Thread.sleep(100L);
            } catch (InterruptedException ex1) {
                logger.warn(ex1.getMessage(), ex1);
            }
            continue;
        }

        String message;
        try {
            message = getMessenge(delivery);
        } catch (InterruptedException ex) {
            logger.warn(ex.getMessage(), ex);
            try {
                Thread.sleep(100L);
            } catch (InterruptedException ex1) {
                logger.warn(ex1.getMessage(), ex1);
            }
            continue;
        }
        if (message == null || message.isEmpty()) {
            try {
                Thread.sleep(100);
            } catch (InterruptedException ex) {
                logger.warn(ex.getMessage(), ex);
            }
        } else {
            LogObject lo = new LogObject();
            try {
                lo.parseJson(message);
                store(lo);
                channel.basicAck(delivery.getEnvelope().getDeliveryTag(), false);
            } catch (Exception ex) {
                logger.debug(message, ex);
            }
        }
    }
}

---

From source file:com.zigbee.function.util.MessageUtil.java

License:Open Source License

public static Channel openChannel(String queueName) {
    ConnectionFactory factory = new ConnectionFactory();

    Channel channel;//from w ww.  ja  v  a2s .c  o  m
    try {
        factory.setHost("45.63.124.106");
        Connection connection = factory.newConnection();
        channel = connection.createChannel();
        channel.queueDeclare(queueName, false, false, false, null);
        return channel;
    } catch (IOException e) {
        e.printStackTrace();
    } catch (TimeoutException e) {
        e.printStackTrace();
    }
    return null;

}

---

From source file:com.zuehlke.carrera.javapilot.show.ConfirmDontLoseMessages.java

License:Mozilla Public License

public static void main1(String[] args) throws IOException, InterruptedException, TimeoutException {

    connectionFactory = new ConnectionFactory();
    String POWER_QUEUE = "/app/pilots/power";
    String json = new JacksonSerializer().serialize(new PowerControl(200, "team", "access", 0L));
    Connection conn = connectionFactory.newConnection();
    Channel ch = conn.createChannel();
    //ch.queueDeclare(POWER_QUEUE, true, false, false, null);
    AMQP.BasicProperties props = new AMQP.BasicProperties.Builder().expiration("0").build();
    ch.basicPublish("", POWER_QUEUE, props, json.getBytes());

    String SENSOR_QUEUE = "/topic/pilots/starterkit/sensor";
    SensorEvent sensorEvent = SensorEvent.createEmptyCarSensor().withRaceTrackId("simulator");
    json = new JacksonSerializer().serialize(sensorEvent);

    //ch.queueDeclare(SENSOR_QUEUE, true, false, false, null);
    ch.basicPublish("", SENSOR_QUEUE, props, json.getBytes());

    ch.close();/*from   www. ja  v  a  2s .c  om*/
    conn.close();
}

---

From source file:controllers.TargetController.java

License:Open Source License

/**
 * This method pushes a message onto a RabbitMQ queue for given target
 * using global settings from project configuration file.
 *
 * @param target The field URL of the target
 * @return/*w w w .j  ava 2s .  co m*/
 */
public static Result archive(Long id) {

    Target target = Target.findById(id);
    Logger.debug("archiveTarget() " + target);
    if (target != null) {
        if (!target.isInScopeAllOrInheritedWithoutLicense()) {
            return ok(infomessage.render("On-demand archiving is only supported for NPLD targets."));
        }

        // Send the message:
        try {
            String queueHost = Play.application().configuration().getString(Const.QUEUE_HOST);
            String queuePort = Play.application().configuration().getString(Const.QUEUE_PORT);
            String queueName = Play.application().configuration().getString(Const.QUEUE_NAME);
            String routingKey = Play.application().configuration().getString(Const.ROUTING_KEY);
            String exchangeName = Play.application().configuration().getString(Const.EXCHANGE_NAME);

            Logger.debug("archiveTarget() queue host: " + queueHost);
            Logger.debug("archiveTarget() queue port: " + queuePort);
            Logger.debug("archiveTarget() queue name: " + queueName);
            Logger.debug("archiveTarget() routing key: " + routingKey);
            Logger.debug("archiveTarget() exchange name: " + exchangeName);

            JsonNode jsonData = Json.toJson(target);
            String message = jsonData.toString();
            Logger.debug("Crawl Now message: " + message);

            ConnectionFactory factory = new ConnectionFactory();
            if (queueHost != null) {
                factory.setHost(queueHost);
            }
            if (queuePort != null) {
                factory.setPort(Integer.parseInt(queuePort));
            }
            Connection connection = factory.newConnection();
            Channel channel = connection.createChannel();

            channel.exchangeDeclare(exchangeName, "direct", true);
            channel.queueDeclare(queueName, true, false, false, null);
            channel.queueBind(queueName, exchangeName, routingKey);

            BasicProperties.Builder propsBuilder = new BasicProperties.Builder();
            propsBuilder.deliveryMode(2);
            channel.basicPublish(exchangeName, routingKey, propsBuilder.build(), message.getBytes());

            channel.close();
            connection.close();

        } catch (IOException e) {
            String msg = "There was a problem queuing this crawl instruction. Please refer to the system administrator.";
            User currentUser = User.findByEmail(request().username());
            StringWriter sw = new StringWriter();
            e.printStackTrace(new PrintWriter(sw));
            String msgFullTrace = sw.toString();
            Logger.error(msgFullTrace);
            if (currentUser.hasRole("sys_admin")) {
                msg = msgFullTrace;
            }
            return ok(infomessage.render(msg));
        } catch (Exception e) {
            String msg = "There was a problem queuing this crawl instruction. Please refer to the system administrator.";
            User currentUser = User.findByEmail(request().username());
            StringWriter sw = new StringWriter();
            e.printStackTrace(new PrintWriter(sw));
            String msgFullTrace = sw.toString();
            Logger.error(msgFullTrace);
            if (currentUser.hasRole("sys_admin")) {
                msg = msgFullTrace;
            }
            return ok(infomessage.render(msg));
        }
    } else {
        Logger.debug("There was a problem sending the message. Target field for archiving is empty");
        return ok(infomessage
                .render("There was a problem sending the message. Target field for archiving is empty"));
    }
    return ok(ukwalicenceresult.render());
}

---

From source file:controllerStuff.ControllerPublisher.java

/**
 *
 * @param connection// ww  w  .j a v a2  s.c o m
 * @param controllerObject
 */
public ControllerPublisher(Connection connection, String nodeID) {
    this.connection = connection;
    this.nodeID = nodeID;
    try {
        controllerChannel = connection.createChannel();
        controllerChannel.exchangeDeclare(EXCHANGE_CONTROLLER_REGETRY, "topic");
    } catch (IOException ex) {
        Logger.getLogger(ControllerPublisher.class.getName()).log(Level.SEVERE, null, ex);
    }
}

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