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

        try {
            this.connection = RabbitMQUtils.openConnection(configuration);
            this.channel = RabbitMQUtils.openChannel(this.connection);
            this.collector = collector;
            this.channel.queueDeclare(queueName, true, false, false, null);
            this.consumer = new QueueingConsumer(channel);
            this.channel.basicConsume(this.queueName, false, consumer);
        } catch (IOException ex) {
            throw new LumifyException("Could not startup RabbitMQ", ex);
        }
    }

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Examples of com.rabbitmq.client.QueueingConsumer

    public void subscribeToBroadcastMessages(final BroadcastConsumer broadcastConsumer) {
        try {
            String queueName = this.channel.queueDeclare().getQueue();
            this.channel.queueBind(queueName, BROADCAST_EXCHANGE_NAME, "");


            final QueueingConsumer callback = new QueueingConsumer(this.channel);
            this.channel.basicConsume(queueName, true, callback);


            final Thread t = new Thread(new Runnable() {
                @Override
                public void run() {
                    try {
                        while (true) {
                            QueueingConsumer.Delivery delivery = callback.nextDelivery();
                            try {
                                JSONObject json = new JSONObject(new String(delivery.getBody()));
                                LOGGER.debug("received message from broadcast exchange [%s]: %s", BROADCAST_EXCHANGE_NAME, json.toString());
                                broadcastConsumer.broadcastReceived(json);
                            } catch (Throwable ex) {

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Examples of com.rabbitmq.client.QueueingConsumer

    public LongRunningProcessMessage getNextLongRunningProcessMessage() {
        try {
            synchronized (this) {
                if (longRunningProcessCallback == null) {
                    channel.queueDeclare(LONG_RUNNING_PROCESS_QUEUE_NAME, true, false, false, null);
                    longRunningProcessCallback = new QueueingConsumer(channel);
                    channel.basicConsume(LONG_RUNNING_PROCESS_QUEUE_NAME, false, longRunningProcessCallback);
                }
            }
            QueueingConsumer.Delivery delivery = longRunningProcessCallback.nextDelivery(1000);
            if (delivery == null) {

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Examples of com.rabbitmq.client.QueueingConsumer

    }
  }
  public Channel getChannel() { return channel; }
  
  public void consume(IEventHandler eh) throws IOException {
    QueueingConsumer consumer = new QueueingConsumer(channel);


    channel.basicConsume(returnedQueueName, noAck, consumer);
    
    while (true) {
      QueueingConsumer.Delivery delivery;
      try {
        delivery = consumer.nextDelivery();
      } catch (InterruptedException ie) {
        continue;
      }
      // (process the message components ...)

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Examples of com.rabbitmq.client.QueueingConsumer

      String bindingKey = _partition;
      channel.queueBind(queueName, EXCHANGE_NAME, bindingKey);


      System.out.println(" [*] " + _consumerId + " Waiting for messages on " + bindingKey + ". 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] " + _consumerId + " Received '" + routingKey + "':'" + message + "'");
      }

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Examples of com.rabbitmq.client.QueueingConsumer

      channel.queueBind(queueName, EXCHANGE_NAME, bindingKey);


      System.out.println(" [*] " + _consumerId + " Waiting for messages on " + bindingKey
          + ". 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] " + _consumerId + " Received '" + routingKey + "':'" + message
            + "'");

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Examples of com.rabbitmq.client.QueueingConsumer

                    } catch (InterruptedException e1) {
                        // ignore, if we are closing, we will exit later
                    }
                }


                QueueingConsumer consumer = new QueueingConsumer(channel);
                // define the queue
                try {
                    channel.exchangeDeclare(rabbitExchange/*exchange*/, rabbitExchangeType/*type*/, rabbitExchangeDurable);
                    channel.queueDeclare(rabbitQueue/*queue*/, rabbitQueueDurable/*durable*/, false/*exclusive*/, rabbitQueueAutoDelete/*autoDelete*/, null);
                    channel.queueBind(rabbitQueue/*queue*/, rabbitExchange/*exchange*/, rabbitRoutingKey/*routingKey*/);
                    channel.basicConsume(rabbitQueue/*queue*/, false/*noAck*/, consumer);
                } catch (Exception e) {
                    if (!closed) {
                        logger.warn("failed to create queue [{}]", e, rabbitQueue);
                    }
                    cleanup(0, "failed to create queue");
                    continue;
                }


                // now use the queue to listen for messages
                while (true) {
                    if (closed) {
                        break;
                    }
                    QueueingConsumer.Delivery task;
                    try {
                        task = consumer.nextDelivery();
                    } catch (Exception e) {
                        if (!closed) {
                            logger.error("failed to get next message, reconnecting...", e);
                        }
                        cleanup(0, "failed to get message");
                        break;
                    }


                    if (task != null && task.getBody() != null) {
                        final List<Long> deliveryTags = Lists.newArrayList();


                        BulkRequestBuilder bulkRequestBuilder = client.prepareBulk();


                        try {
                            bulkRequestBuilder.add(task.getBody(), 0, task.getBody().length, false);
                        } catch (Exception e) {
                            logger.warn("failed to parse request for delivery tag [{}], ack'ing...", e, task.getEnvelope().getDeliveryTag());
                            try {
                                channel.basicAck(task.getEnvelope().getDeliveryTag(), false);
                            } catch (IOException e1) {
                                logger.warn("failed to ack [{}]", e1, task.getEnvelope().getDeliveryTag());
                            }
                            continue;
                        }


                        deliveryTags.add(task.getEnvelope().getDeliveryTag());


                        if (bulkRequestBuilder.numberOfActions() < bulkSize) {
                            // try and spin some more of those without timeout, so we have a bigger bulk (bounded by the bulk size)
                            try {
                                while ((task = consumer.nextDelivery(bulkTimeout.millis())) != null) {
                                    try {
                                        bulkRequestBuilder.add(task.getBody(), 0, task.getBody().length, false);
                                    } catch (Exception e) {
                                        logger.warn("failed to parse request for delivery tag [{}], ack'ing...", e, task.getEnvelope().getDeliveryTag());
                                        try {

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Examples of com.rabbitmq.client.QueueingConsumer

                channel.exchangeDeclare(AMQPUtil.EXCHANGE_NAME_TOPIC, AMQPUtil.EXCHANGE_TYPE_TOPIC);


                String queueName = channel.queueDeclare().getQueue();
                channel.queueBind(queueName, AMQPUtil.EXCHANGE_NAME_TOPIC, topic.getNativeKey());


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


                while (true) {
                    QueueingConsumer.Delivery delivery = consumer.nextDelivery();
                    String message = new String(delivery.getBody());


                    callback.onMessage(message);
                }
            } catch (Exception e) {

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Examples of com.rabbitmq.client.QueueingConsumer

                channel.exchangeDeclare(AMQPUtil.EXCHANGE_NAME_FANOUT, AMQPUtil.EXCHANGE_TYPE_FANOUT);


                String queueName = channel.queueDeclare().getQueue();
                channel.queueBind(queueName, AMQPUtil.EXCHANGE_NAME_FANOUT, "");


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


                while (true) {
                    QueueingConsumer.Delivery delivery = consumer.nextDelivery();
                    String message = new String(delivery.getBody());


                    callback.onMessage(message);
                }
            } catch (Exception e) {

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Examples of com.rabbitmq.client.QueueingConsumer

                channel.exchangeDeclare(AMQPUtil.EXCHANGE_NAME_DIRECT, AMQPUtil.EXCHANGE_TYPE_DIRECT);


                String queueName = channel.queueDeclare().getQueue();
                channel.queueBind(queueName, AMQPUtil.EXCHANGE_NAME_DIRECT, key.getNativeKey());


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


                while (true) {
                    QueueingConsumer.Delivery delivery = consumer.nextDelivery();
                    String message = new String(delivery.getBody());


                    callback.onMessage(message);
                }
            } catch (Exception e) {

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