Examples of com.rabbitmq.client.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.

      
      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())

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    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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        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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    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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      String queueName = channel.queueDeclare(queueInputName, true, false, false, null).getQueue();
      channel.queueBind(queueName, EXCHANGE_NAME, routingKeyFromUser, headers);
    
      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 routingKeyFromSender = delivery.getEnvelope().getRoutingKey();


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

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    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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            final Channel ch = conn.createChannel();


            ch.queueDeclare(queueName, false, false, false, null);


            QueueingConsumer consumer = new QueueingConsumer(ch);
            ch.basicConsume(queueName, consumer);
            while (true) {
                QueueingConsumer.Delivery delivery = consumer.nextDelivery();
                System.out.println("Message: " + new String(delivery.getBody()));
                ch.basicAck(delivery.getEnvelope().getDeliveryTag(), false);
            }
        } catch (Exception ex) {
            System.err.println("Main thread caught exception: " + ex);

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  static final String QUEUE = "some-queue";
  static final int THREADS = 5;


  public void testNThreadShutdown() throws Exception{
    Channel channel = connection.createChannel();
    final QueueingConsumer c = new QueueingConsumer(channel);
    channel.queueDeclare(QUEUE, false, true, true, null);
    channel.basicConsume(QUEUE, c);
    final AtomicInteger count = new AtomicInteger(THREADS);
    final CountDownLatch latch = new CountDownLatch(THREADS);


    for(int i = 0; i < THREADS; i++){
      new Thread(){
        @Override public void run(){
          try {
            while(true){
                c.nextDelivery();
            }
          } catch (ShutdownSignalException sig) {
              count.decrementAndGet();
          } catch (Exception e) {
            throw new RuntimeException(e);

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            channel.queueBind(queue, exchange, topicPattern);


            System.out.println("Listening to exchange " + exchange + ", pattern " + topicPattern +
                               " from queue " + queue);


            QueueingConsumer consumer = new QueueingConsumer(channel);
            channel.basicConsume(queue, consumer);
            while (true) {
                QueueingConsumer.Delivery delivery = consumer.nextDelivery();
                Envelope envelope = delivery.getEnvelope();
                System.out.println(envelope.getRoutingKey() + ": " + new String(delivery.getBody()));
                channel.basicAck(envelope.getDeliveryTag(), false);
            }
        } catch (Exception ex) {

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            Channel ch1 = conn.createChannel();


            String queueName = ch1.queueDeclare().getQueue();
            ch1.queueBind(queueName, exchange, "#");


            QueueingConsumer consumer = new QueueingConsumer(ch1);
            ch1.basicConsume(queueName, true, consumer);
            while (true) {
                QueueingConsumer.Delivery delivery = consumer.nextDelivery();
                String routingKey = delivery.getEnvelope().getRoutingKey();
                String contentType = delivery.getProperties().getContentType();
                System.out.println("Content-type: " + contentType);
                System.out.println("Routing-key: " + routingKey);
                System.out.println("Body:");

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