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.


    private void assertFailValidation(Map<String, Object> args) throws IOException {
        Channel ch = connection.createChannel();
        String queue = ch.queueDeclare().getQueue();
        try {
            ch.basicConsume(queue, true, args, new QueueingConsumer(ch));
            fail("Validation should fail for " + args);
        } catch (IOException ioe) {
            checkShutdownSignal(AMQP.PRECONDITION_FAILED, ioe);
        }
    }

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    private static final int COUNT = 10;


    public void testConsumerPriorities() throws Exception {
        String queue = channel.queueDeclare().getQueue();
        QueueingConsumer highConsumer = new QueueingConsumer(channel);
        QueueingConsumer medConsumer = new QueueingConsumer(channel);
        QueueingConsumer lowConsumer = new QueueingConsumer(channel);
        String high = channel.basicConsume(queue, true, args(1), highConsumer);
        String med = channel.basicConsume(queue, true, medConsumer);
        channel.basicConsume(queue, true, args(-1), lowConsumer);


        publish(queue, COUNT, "high");

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    channel.exchangeDeclare("rpc", "direct");
    channel.queueDeclare("ping", false, false, false, null);
    channel.queueBind("ping", "rpc", "ping");


    consumer = new QueueingConsumer(channel);
    channel.basicConsume("ping", false, "ping", consumer);


    System.out.println(
      "Waiting for RPC calls..."
    );

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  }


  public Client setupConsumer()
  throws Exception {
    replyQueueName = channel.queueDeclare().getQueue();
    consumer = new QueueingConsumer(channel);
    channel.basicConsume(replyQueueName, false, consumer);
    return this;
  }

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


            //  Establish the REQ/REP wiring.
            String queueName = channel.queueDeclare().getQueue();
            QueueingConsumer consumer = new QueueingConsumer(channel);
            channel.basicConsume(queueName, true, consumer);


            //  Send the request
            AMQP.BasicProperties properties = new AMQP.BasicProperties();
            properties.setReplyTo(queueName);
            channel.basicPublish("", "REQREP", properties,
                "Hello!".getBytes());


            //  Get and print the reply
            QueueingConsumer.Delivery delivery = consumer.nextDelivery();
            String reply = new String(delivery.getBody());
            System.out.println(reply);


            connection.close();

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            Channel channel = connection.createChannel();


            //  Establish the PUB/SUB wiring
            String queueName = channel.queueDeclare().getQueue();
            channel.queueBind(queueName, "PIPELINE", null);
            QueueingConsumer consumer = new QueueingConsumer(channel);
            channel.basicConsume(queueName, true, consumer);


            for (;;) {


                //  Get next request
                String msg = consumer.nextDelivery().getBody().toString();
                System.out.println (msg);
            }
        } catch (Exception e) {
            System.err.println("Main thread caught exception: " + e);
            e.printStackTrace();

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


            //  Establish the REQ/REP wiring.
            channel.queueDeclare("REQREP", true, false, false, null);
            QueueingConsumer consumer = new QueueingConsumer(channel);
            channel.basicConsume("REQREP", true, consumer);


            for (;;) {


                //  Get next request
                QueueingConsumer.Delivery delivery = consumer.nextDelivery();
                String replyTo = delivery.getProperties().getReplyTo();
                String correlationId = delivery.getProperties().getCorrelationId();


                BasicProperties props =
                  (BasicProperties) (delivery.getProperties().clone());

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            Channel channel = connection.createChannel();


            //  Establish the PUB/SUB wiring
            String queueName = channel.queueDeclare().getQueue();
            channel.queueBind(queueName, "PUBSUB", null);
            QueueingConsumer consumer = new QueueingConsumer(channel);
            channel.basicConsume(queueName, true, consumer);


            for (;;) {


                //  Get next request
                String msg = consumer.nextDelivery().getBody().toString();
                System.out.println (msg);
            }
        } catch (Exception e) {
            System.err.println("Main thread caught exception: " + e);
            e.printStackTrace();

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    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");

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      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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