Example usage for com.rabbitmq.client Channel basicQos

Introduction

In this page you can find the example usage for com.rabbitmq.client Channel basicQos.

Prototype

void basicQos(int prefetchCount) throws IOException;

Source Link

Document

Request a specific prefetchCount "quality of service" settings for this channel.

Usage

From source file:play.modules.rabbitmq.RabbitMQPlugin.java

License:Apache License

/**
    * Creates the channel for a subscriber to consume messages from an exchange
    * (Exchange is created.  Subscribers queue and binding by routing key are created)
    * /*from w  ww  .j a  va 2  s.c om*/
    * @param exchangeName
    *            the exchange name
    * @param queue
    *            the queue
    * @param routingKey
    *            the routing key
    * @return the channel
    * @throws Exception
    *             the exception
    */
public Channel createSubscribersChannel(String exchangeName, String queue, String routingKey) throws Exception {
    // Counter that keeps track of number of retries
    int attempts = 0;

    // Get Plugin
    RabbitMQPlugin plugin = Play.application().plugin(RabbitMQPlugin.class);

    // Create Channel
    Channel channel = this.createChannel();

    // Basic Qos
    if (RabbitMQPlugin.isBasicQos()) {
        int prefetchCount = 1;
        channel.basicQos(prefetchCount);
    }

    // Start Daemon
    while (true) {
        // Add to the number of retries
        attempts++;

        // Log Debug
        Logger.debug("Retry " + attempts);

        // Get Next Delivery Message
        try {
            // http://www.rabbitmq.com/api-guide.html
            channel.exchangeDeclare(exchangeName, plugin.getExchangeType(), true);
            channel.queueDeclare(queue, plugin.isDurable(), false, false, null);
            channel.queueBind(queue, exchangeName, routingKey);

            // Log Debug
            Logger.info("RabbitMQ Task Channel Available: " + channel);

            // Return Channel
            return channel;

        } catch (Throwable t) {
            // Log Debug
            Logger.error("Error establishing a connection to RabbitMQ, will keep retrying - Exception: %s",
                    ExceptionUtil.getStackTrace(t));

            // Sleep a little while before retrying
            try {
                Thread.sleep(1000 * 10);
            } catch (InterruptedException ex) {
            }
        }
    }
}

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From source file:play.modules.rabbitmq.RabbitMQPlugin.java

License:Apache License

/**
 * Creates the channel to publish messages to an exchange
 * (Exchange is created.  Queue and bindings are NOT created)
 * /*  w  ww. j  a  va  2s.  c o  m*/
 * @param exchangeName
 *            the exchange name
 * @return the channel
 * @throws Exception
 *             the exception
 */
public Channel createPublishersChannel(String exchangeName) throws Exception {
    // Counter that keeps track of number of retries
    int attempts = 0;

    // Get Plugin
    RabbitMQPlugin plugin = Play.application().plugin(RabbitMQPlugin.class);

    // Create Channel
    Channel channel = this.createChannel();

    // Basic Qos
    if (RabbitMQPlugin.isBasicQos()) {
        int prefetchCount = 1;
        channel.basicQos(prefetchCount);
    }

    // Start Daemon
    while (true) {
        // Add to the number of retries
        attempts++;

        // Log Debug
        Logger.debug("Retry " + attempts);

        // Get Next Delivery Message
        try {
            // http://www.rabbitmq.com/api-guide.html
            channel.exchangeDeclare(exchangeName, plugin.getExchangeType(), true);

            // Log Debug
            Logger.info("RabbitMQ Task Channel Available: " + channel);

            // Return Channel
            return channel;

        } catch (Throwable t) {
            // Log Debug
            Logger.error("Error establishing a connection to RabbitMQ, will keep retrying - Exception: %s",
                    ExceptionUtil.getStackTrace(t));

            // Sleep a little while before retrying
            try {
                Thread.sleep(1000 * 10);
            } catch (InterruptedException ex) {
            }
        }
    }
}

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From source file:reactor.rabbitmq.Receiver.java

License:Open Source License

public Flux<AcknowledgableDelivery> consumeManuelAck(final String queue, ReceiverOptions options) {
    // TODO track flux so it can be disposed when the sender is closed?
    // could be also developer responsibility
    return Flux.create(emitter -> {
        connectionMono.subscribe(connection -> {
            try {

                Channel channel = connection.createChannel();
                if (options.getQos() != 0) {
                    channel.basicQos(options.getQos());
                }/*w  w w. j  a  v a  2  s.com*/
                final DefaultConsumer consumer = new DefaultConsumer(channel) {
                    @Override
                    public void handleDelivery(String consumerTag, Envelope envelope,
                            AMQP.BasicProperties properties, byte[] body) throws IOException {
                        AcknowledgableDelivery message = new AcknowledgableDelivery(envelope, properties, body,
                                getChannel());
                        if (options.getHookBeforeEmit().apply(emitter, message)) {
                            emitter.next(message);
                        }
                    }
                };
                final String consumerTag = channel.basicConsume(queue, false, consumer);
                emitter.onDispose(() -> {

                    try {
                        if (channel.isOpen() && channel.getConnection().isOpen()) {
                            channel.basicCancel(consumerTag);
                            channel.close();
                        }
                    } catch (TimeoutException | IOException e) {
                        throw new ReactorRabbitMqException(e);
                    }
                });
            } catch (IOException e) {
                throw new ReactorRabbitMqException(e);
            }
        });
    }, options.getOverflowStrategy());
}

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From source file:se.kodiak.logging.appenders.util.MQListener.java

License:Open Source License

public MQListener() {
    try {//from ww  w .  ja v  a2 s.  c o m
        ConnectionFactory factory = new ConnectionFactory();
        Connection connection = factory.newConnection();
        Channel channel = connection.createChannel();
        channel.basicQos(1);
        channel.exchangeDeclare("test", "topic");
        String queueName = channel.queueDeclare().getQueue();
        channel.queueBind(queueName, "test", "log.*");
        consumer = new QueueingConsumer(channel);
        channel.basicConsume(queueName, true, consumer);
    } catch (Exception e) {
        throw new RuntimeException(e);
    }
}

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From source file:taucalcmanager.TaucalcManager.java

/**
 * @param args the command line arguments
 * @throws java.io.IOException//from  w w w  . j av a2 s.c om
 * @throws java.util.concurrent.TimeoutException
 */
public static void main(String[] args) throws IOException, TimeoutException {
    ConnectionFactory factory = new ConnectionFactory();
    factory.setHost("localhost");
    Connection connection = factory.newConnection();
    Channel channel = connection.createChannel();
    channel.queueDeclare(WORKQUEUENAME, false, false, false, null);
    channel.queueDeclare(RESULTQUEUENAME, false, false, false, null);
    channel.basicQos(1);

    int calcs = Integer.parseInt(args[0]);
    int triesPerCalc = Integer.parseInt(args[1]);
    int[] results = new int[calcs];
    byte[] task = { (byte) (triesPerCalc >> 24), (byte) (triesPerCalc >> 16), (byte) (triesPerCalc >> 8),
            (byte) (triesPerCalc) };

    System.out.println("Start Publishing");
    for (int i = 0; i < calcs; i++) {
        channel.basicPublish("", WORKQUEUENAME, null, task);
    }
    System.out.println("Done Publishing");
    GetResponse response;
    System.out.println("Start Gathering results");
    for (int i = 0; i < calcs; i++) {
        System.out.println("Waiting for next result: ( " + i + " )");
        do {
            response = channel.basicGet(RESULTQUEUENAME, true);
        } while (response == null);

        results[i] = ByteBuffer.wrap(response.getBody()).getInt();
        System.out.println("Received result: " + results[i]);
    }
    System.out.println("Done gathering results");
    System.out.println("Calculating tau");
    BigDecimal result = sumToTau(sum(results), calcs, triesPerCalc);
    System.out.println("Tau = " + result);
    BigDecimal two = new BigDecimal(2);
    System.out.println("pi = tau/2 = " + result.divide(two, RoundingMode.HALF_UP));
    channel.close();
    connection.close();
}

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From source file:taucalcworker.TaucalcWorker.java

/**
 * @param args the command line arguments
 * @throws java.io.IOException//from w  w w  . java  2s. c om
 * @throws java.util.concurrent.TimeoutException
 */
public static void main(String[] args) throws IOException, TimeoutException {
    ConnectionFactory factory = new ConnectionFactory();
    factory.setHost("localhost");
    Connection connection = factory.newConnection();
    Channel channel = connection.createChannel();
    channel.queueDeclare(WORKQUEUENAME, false, false, false, null);
    channel.queueDeclare(RESULTQUEUENAME, false, false, false, null);
    channel.basicQos(1);

    byte[] inputbyte = { 0, 0, 0, 0 };
    String input = "";

    do {
        if (System.in.available() > 0) {
            System.in.read(inputbyte);
            input = new String(inputbyte);
        }
        GetResponse response = channel.basicGet(WORKQUEUENAME, false);
        if (response != null) {
            long deliverytag = response.getEnvelope().getDeliveryTag();
            byte[] body = response.getBody();
            int tries = ByteBuffer.wrap(body).getInt();
            System.out.println("Task received: " + tries);
            int success = 0;
            for (int i = 0; i < tries; i++) {
                double x = Math.random();
                double y = Math.random();
                if (x * x + y * y <= 1) {
                    success++;
                }
            }
            System.out.println("success: " + success + " out of " + tries);
            double tau = ((double) success / tries) * 8;
            System.out.println("Tau = " + tau);
            byte[] resultbytes = new byte[8];
            ByteBuffer.wrap(resultbytes).putDouble(tau);
            channel.basicPublish("", RESULTQUEUENAME, null, resultbytes);
            channel.basicAck(deliverytag, false);
        }
    } while (!input.equals("stop"));
    channel.close();
    connection.close();
    System.out.println("You stopped the program.");
}

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From source file:vn.com.uet.performance.rabbitmq.MulticastParams.java

License:Open Source License

public Consumer createConsumer(Connection connection, Stats stats, String id) throws IOException {
    Channel channel = connection.createChannel();
    if (consumerTxSize > 0)
        channel.txSelect();/*w  w  w.j  ava 2s. c o m*/
    String qName = configureQueue(connection, id);
    if (consumerPrefetch > 0)
        channel.basicQos(consumerPrefetch);
    if (channelPrefetch > 0)
        channel.basicQos(channelPrefetch, true);
    return new Consumer(channel, id, qName, consumerTxSize, autoAck, multiAckEvery, stats, consumerRateLimit,
            consumerMsgCount, timeLimit);
}

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From source file:wiki.messaging.Receive.java

License:Open Source License

public static void main(String[] args) throws IOException, InterruptedException {
    String url = null;/*w w  w  .j  a v  a  2  s  .  c  o m*/
    String rabbitMqUrl = null;
    for (int i = 0; i < args.length; i++) {
        if (args[i].equals("ds")) {
            url = args[i + 1];
        } else if (args[i].equals("rq")) {
            rabbitMqUrl = args[i + 1];
        } else if (args[i].equals("mj")) {
            maxJobs = Integer.valueOf(args[i + 1]);
        }
    }
    if (rabbitMqUrl == null) {
        rabbitMqUrl = "192.168.1.108";
    }
    if (url == null) {
        url = "localhost";
    }
    //        if (resultUrl == null) {
    //            resultUrl = url;
    //        }
    threadPool = new ExecutorCompletionService<>(Executors.newFixedThreadPool(maxJobs));
    System.out.println("DataSource: " + url);
    //        System.out.println("ResultWrite: " + resultUrl);
    DbConnector ds = new DbConnector(url);
    //        DbConnector rs = new DbConnector(resultUrl);

    ConnectionFactory factory = new ConnectionFactory();
    factory.setHost(rabbitMqUrl);
    factory.setUsername("wiki");
    factory.setPassword("wiki");
    Connection connection = factory.newConnection();
    Channel channel = connection.createChannel();

    channel.queueDeclare(QUEUE_NAME, false, false, false, null);
    channel.queueDeclare(RESULT_QUEUE_NAME, true, false, false, null);
    System.out.println(" [*] Waiting for messages.");

    channel.basicQos(maxJobs);

    QueueingConsumer consumer = new QueueingConsumer(channel);
    boolean autoAck = false;
    channel.basicConsume(QUEUE_NAME, autoAck, consumer);

    while (true) {
        QueueingConsumer.Delivery delivery = consumer.nextDelivery();
        String message = new String(delivery.getBody());
        System.out.println(" [x] Received '" + message + "'");
        doWork(message, ds);
        saveResult(channel);
        System.out.println(" [x] Done");
        channel.basicAck(delivery.getEnvelope().getDeliveryTag(), false);
    }
}

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From source file:wiki.messaging.Treeceive.java

License:Open Source License

public static void main(String[] args) throws IOException, InterruptedException {
    String url = null;//from w w w .  j av  a 2  s  . co m
    String rabbitMqUrl = null;
    for (int i = 0; i < args.length; i++) {
        if (args[i].equals("ds")) {
            url = args[i + 1];
        } else if (args[i].equals("rq")) {
            rabbitMqUrl = args[i + 1];
        } else if (args[i].equals("mj")) {
            maxJobs = Integer.valueOf(args[i + 1]);
        }
    }
    if (rabbitMqUrl == null) {
        rabbitMqUrl = "192.168.1.108";
    }
    if (url == null) {
        url = "localhost";
    }
    //        if (resultUrl == null) {
    //            resultUrl = url;
    //        }
    threadPool = new ExecutorCompletionService<>(Executors.newFixedThreadPool(maxJobs));
    System.out.println("DataSource: " + url);
    //        System.out.println("ResultWrite: " + resultUrl);
    DbConnector ds = new DbConnector(url);
    //        DbConnector rs = new DbConnector(resultUrl);

    ConnectionFactory factory = new ConnectionFactory();
    factory.setHost(rabbitMqUrl);
    factory.setUsername("wiki");
    factory.setPassword("wiki");
    Connection connection = factory.newConnection();
    Channel channel = connection.createChannel();

    channel.queueDeclare(QUEUE_NAME, false, false, false, null);
    channel.queueDeclare(RESULT_QUEUE_NAME, true, false, false, null);
    System.out.println(" [*] Waiting for messages.");

    channel.basicQos(maxJobs);

    QueueingConsumer consumer = new QueueingConsumer(channel);
    boolean autoAck = false;
    channel.basicConsume(QUEUE_NAME, autoAck, consumer);

    while (true) {
        QueueingConsumer.Delivery delivery = consumer.nextDelivery();
        String message = new String(delivery.getBody());
        System.out.println(" [x] Received '" + message + "'");
        doWork(message, ds);
        saveResults(channel);
        System.out.println(" [x] Done");
        channel.basicAck(delivery.getEnvelope().getDeliveryTag(), false);
    }
}

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From source file:workqueue.Worker.java

public static void main(String[] argv) throws Exception {
    ConnectionFactory factory = new ConnectionFactory();
    factory.setHost("datdb.cphbusiness.dk");
    final Connection connection = factory.newConnection();
    final Channel channel = connection.createChannel();

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

    channel.basicQos(1);

    final Consumer consumer = new DefaultConsumer(channel) {
        @Override//from  w  w w  .  ja  v a 2  s. c  o m
        public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties,
                byte[] body) throws IOException {
            String message = new String(body, "UTF-8");

            System.out.println(" [x] Received '" + message + "'");
            try {
                doWork(message);
            } finally {
                System.out.println(" [x] Done");
                channel.basicAck(envelope.getDeliveryTag(), false);
            }
        }
    };
    channel.basicConsume(TASK_QUEUE_NAME, false, consumer);
}

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