Examples of QueueingConsumer

com.rabbitmq.client.QueueingConsumer
te connection and channel. {@link ConnectionFactory} factory = new ConnectionFactory();Connection conn = factory.newConnection(); {@link Channel} ch1 = conn.createChannel();// Declare a queue and bind it to an exchange. String queueName = ch1.queueDeclare(). {@link AMQP.Queue.DeclareOk#getQueue getQueue}(); ch1. {@link Channel#queueBind queueBind}(queueName, exchangeName, queueName); // Create the QueueingConsumer and have it consume from the queue QueueingConsumer consumer = new {@link QueueingConsumer#QueueingConsumer QueueingConsumer}(ch1); ch1. {@link Channel#basicConsume basicConsume}(queueName, false, consumer); // Process deliveries while (/* some condition * /) { {@link QueueingConsumer.Delivery} delivery = consumer.{@link QueueingConsumer#nextDelivery nextDelivery}(); // process delivery ch1. {@link Channel#basicAck basicAck}(delivery. {@link QueueingConsumer.Delivery#getEnvelope getEnvelope}(). {@link Envelope#getDeliveryTag getDeliveryTag}(), false); }
For a more complete example, see LogTail in the test/src/com/rabbitmq/examples directory of the source distribution.

deprecated QueueingConsumer was introduced to allow applications to overcome a limitation in the way Connection managed threads and consumer dispatching. When QueueingConsumer was introduced, callbacks to Consumers were made on the Connection's thread. This had two main drawbacks. Firstly, the Consumer could stall the processing of all Channels on the Connection. Secondly, if a Consumer made a recursive synchronous call into its Channel the client would deadlock.
QueueingConsumer provided client code with an easy way to obviate this problem by queueing incoming messages and processing them on a separate, application-managed thread.
The threading behaviour of Connection and Channel has been changed so that each Channel uses a distinct thread for dispatching to Consumers. This prevents Consumers on one Channel holding up Consumers on another and it also prevents recursive calls from deadlocking the client.
As such, it is now safe to implement Consumer directly or to extend DefaultConsumer.

Examples of com.rabbitmq.client.QueueingConsumer

    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());
      System.out.println(" [x] Received '" + message + "'");
    }
  }

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Examples of com.rabbitmq.client.QueueingConsumer

    Channel channel = connection.createChannel();
    channel.exchangeDeclare(EXCHANGE_NAME, "fanout");
    String queueName = channel.queueDeclare().getQueue();
    channel.queueBind(queueName, EXCHANGE_NAME, "");
    System.out.println(" [*] Waiting for messages. To exit press CTRL+C");
    QueueingConsumer consumer = new QueueingConsumer(channel);
    channel.basicConsume(queueName, true, consumer);
    while (true) {
      QueueingConsumer.Delivery delivery = consumer.nextDelivery();
      String message = new String(delivery.getBody());
      System.out.println(" [x] Received '" + message + "'");
    }
  }

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Examples of com.rabbitmq.client.QueueingConsumer

    }
    for (String severity : argv) {
      channel.queueBind(queueName, EXCHANGE_NAME, severity);
    }
    System.out.println(" [*] Waiting for messages. To exit press CTRL+C");
    QueueingConsumer consumer = new QueueingConsumer(channel);
    channel.basicConsume(queueName, true, consumer);
    while (true) {
      QueueingConsumer.Delivery delivery = consumer.nextDelivery();
      String message = new String(delivery.getBody());
      String routingKey = delivery.getEnvelope().getRoutingKey();
      System.out.println(" [x] Received '" + routingKey + "':'" + message
          + "'");
    }

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Examples of com.rabbitmq.client.QueueingConsumer

    Connection connection = factory.newConnection();
    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);
    QueueingConsumer consumer = new QueueingConsumer(channel);
    channel.basicConsume(TASK_QUEUE_NAME, false, consumer);
    while (true) {
      QueueingConsumer.Delivery delivery = consumer.nextDelivery();
      String message = new String(delivery.getBody());
      System.out.println(" [x] Received '" + message + "'");
      doWork(message);
      System.out.println(" [x] Done");
      channel.basicAck(delivery.getEnvelope().getDeliveryTag(), false);

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Examples of com.rabbitmq.client.QueueingConsumer

      factory.setHost("localhost");
      connection = factory.newConnection();
      channel = connection.createChannel();
      channel.queueDeclare(RPC_QUEUE_NAME, false, false, false, null);
      channel.basicQos(1);
      QueueingConsumer consumer = new QueueingConsumer(channel);
      channel.basicConsume(RPC_QUEUE_NAME, false, consumer);
      System.out.println(" [x] Awaiting RPC requests");
      while (true) {
        String response = null;
        QueueingConsumer.Delivery delivery = consumer.nextDelivery();
        BasicProperties props = delivery.getProperties();
        BasicProperties replyProps = new BasicProperties.Builder()
            .correlationId(props.getCorrelationId()).build();
        try {
          String message = new String(delivery.getBody(), "UTF-8");

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Examples of com.rabbitmq.client.QueueingConsumer

    ConnectionFactory factory = new ConnectionFactory();
    factory.setHost("localhost");
    connection = factory.newConnection();
    channel = connection.createChannel();
    replyQueueName = channel.queueDeclare().getQueue();
    consumer = new QueueingConsumer(channel);
    channel.basicConsume(replyQueueName, true, consumer);
  }

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Examples of com.rabbitmq.client.QueueingConsumer

      for (String bindingKey : argv) {
        channel.queueBind(queueName, EXCHANGE_NAME, bindingKey);
      }
      System.out
          .println(" [*] Waiting for messages. To exit press CTRL+C");
      QueueingConsumer consumer = new QueueingConsumer(channel);
      channel.basicConsume(queueName, true, consumer);
      while (true) {
        QueueingConsumer.Delivery delivery = consumer.nextDelivery();
        String message = new String(delivery.getBody());
        String routingKey = delivery.getEnvelope().getRoutingKey();
        System.out.println(" [x] Received '" + routingKey + "':'"
            + message + "'");
      }

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Examples of com.rabbitmq.client.QueueingConsumer

      channel.exchangeDeclare(exchangeName, type, durable);
      channel.queueDeclare(queueName, durable, exclusive, autoDelete, null);
      channel.queueBind(queueName, exchangeName, routingKey);
      
      boolean autoAck = false;
      QueueingConsumer consumer = new QueueingConsumer(channel);
      channel.basicConsume(queueName, autoAck, consumer);
      
      boolean run = true;
      while (run) {
        final ReentrantLock runLock = this.runLock;
              runLock.lock();
              try {
            QueueingConsumer.Delivery delivery;
            try {
                delivery = consumer.nextDelivery(DELIVERY_WAIT_TIMEOUT);
                if(null == delivery)
                  continue;
            } catch (InterruptedException ie) {
              _logger.error("[THREAD INTERRUPT] consumer get interrupted :" + queueName);
              run = false;

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Examples of com.rabbitmq.client.QueueingConsumer


public class DirectReplyTo extends BrokerTestCase {
    private static final String QUEUE = "amq.rabbitmq.reply-to";


    public void testRoundTrip() throws IOException, InterruptedException {
        QueueingConsumer c = new QueueingConsumer(channel);
        String replyTo = rpcFirstHalf(c);
        declare(connection, replyTo, true);
        channel.confirmSelect();
        basicPublishVolatile("response".getBytes(), "", replyTo, MessageProperties.BASIC);
        channel.waitForConfirms();


        QueueingConsumer.Delivery del = c.nextDelivery();
        assertEquals("response", new String(del.getBody()));
    }

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Examples of com.rabbitmq.client.QueueingConsumer

        QueueingConsumer.Delivery del = c.nextDelivery();
        assertEquals("response", new String(del.getBody()));
    }


    public void testHack() throws IOException, InterruptedException {
        QueueingConsumer c = new QueueingConsumer(channel);
        String replyTo = rpcFirstHalf(c);
        // 5 chars should overwrite part of the key but not the pid; aiming to prove
        // we can't publish using just the pid
        replyTo = replyTo.substring(0, replyTo.length() - 5) + "xxxxx";
        declare(connection, replyTo, false);
        basicPublishVolatile("response".getBytes(), "", replyTo, MessageProperties.BASIC);


        QueueingConsumer.Delivery del = c.nextDelivery(500);
        assertNull(del);
    }

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