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.queueBind(q, "amq.fanout", "");


        final Map<String, Integer> counts =
            Collections.synchronizedMap(new HashMap<String, Integer>());


        QueueingConsumer c = new QueueingConsumer(channel) {
                @Override public void handleDelivery(String consumerTag,
                                                     Envelope envelope,
                                                     AMQP.BasicProperties properties,
                                                     byte[] body)
                    throws IOException {
                    counts.put(consumerTag, counts.get(consumerTag) + 1);
                    super.handleDelivery(consumerTag, envelope,
                                         properties, body);
                }
            };


        channel.basicConsume(q, false, "c1", c);
        channel.basicConsume(q, false, "c2", c);


        int count = 10;
        counts.put("c1", 0);
        counts.put("c2", 0);
        fill(count);
        try {
            for (int i = 0; i < count; i++) {
                Delivery d = c.nextDelivery();
                channel.basicAck(d.getEnvelope().getDeliveryTag(), false);
            }
        } catch (InterruptedException ie) {
            fail("interrupted");
        }

View Full Code Here


    public void testConsumerLifecycle()
        throws IOException
    {
        channel.basicQos(1);
        QueueingConsumer c = new QueueingConsumer(channel);
        String queue = "qosTest";
        channel.queueDeclare(queue, false, false, false, null);
        channel.queueBind(queue, "amq.fanout", "");
        fill(3);
        String tag;

View Full Code Here

    }


    public void testSetLimitAfterConsume()
        throws IOException
    {
        QueueingConsumer c = new QueueingConsumer(channel);
        declareBindConsume(c);
        channel.basicQos(1);
        fill(3);
        //We actually only guarantee that the limit takes effect
        //*eventually*, so this can in fact fail. It's pretty unlikely

View Full Code Here

    }


    public void testLimitIncrease()
        throws IOException
    {
        QueueingConsumer c = new QueueingConsumer(channel);
        configure(c, 1, 3);
        channel.basicQos(2);
        drain(c, 1);
    }

View Full Code Here

    }


    public void testLimitDecrease()
        throws IOException
    {
        QueueingConsumer c = new QueueingConsumer(channel);
        Queue<Delivery> d = configure(c, 2, 4);
        channel.basicQos(1);
        drain(c, 0);
        ack(d, true);
        drain(c, 1);

View Full Code Here

    }


    public void testLimitedToUnlimited()
        throws IOException
    {
        QueueingConsumer c = new QueueingConsumer(channel);
        configure(c, 1, 3);
        channel.basicQos(0);
        drain(c, 2);
    }

View Full Code Here

    public void testLimitingMultipleChannels()
        throws IOException
    {
        Channel ch1 = connection.createChannel();
        Channel ch2 = connection.createChannel();
        QueueingConsumer c1 = new QueueingConsumer(ch1);
        QueueingConsumer c2 = new QueueingConsumer(ch2);
        String q1 = declareBindConsume(ch1, c1, false);
        String q2 = declareBindConsume(ch2, c2, false);
        ch1.basicConsume(q2, false, c1);
        ch2.basicConsume(q1, false, c2);
        ch1.basicQos(1);

View Full Code Here

    }


    public void testLimitInheritsUnackedCount()
        throws IOException
    {
        QueueingConsumer c = new QueueingConsumer(channel);
        declareBindConsume(c);
        fill(1);
        drain(c, 1);
        channel.basicQos(2);
        fill(2);

View Full Code Here

        drain(c, 1);
    }


    public void testFlow() throws IOException
    {
        QueueingConsumer c = new QueueingConsumer(channel);
        declareBindConsume(c);
        fill(1);
        drain(c, 1);
        channel.flow(false);
        fill(1);

View Full Code Here

    }


    public void testLimitAndFlow() throws IOException
    {
        channel.basicQos(1);
        QueueingConsumer c = new QueueingConsumer(channel);
        declareBindConsume(c);
        channel.flow(false);
        fill(3);
        drain(c, 0);
        channel.flow(true);

View Full Code Here

0 1 2 3 4 5 6 7 8 9

TOP

Related Classes of com.rabbitmq.client.QueueingConsumer

Client

com.espertech.esperio.amqp.AMQPSupportReceiveRunnable

com.espertech.esperio.amqp.AMQPSupportUtil

com.jbrisbin.vcloud.classloader.RabbitMQClassLoader$RemoteLoader

com.linkedin.helix.recipes.rabbitmq.ConsumerThread

com.omniti.reconnoiter.broker.RabbitMQ

com.rabbitmq.client.test.functional.BindingLifecycleBase

com.rabbitmq.client.test.functional.ConsumerCancelNotification

com.rabbitmq.client.test.functional.ConsumerCancelNotificiation

com.rabbitmq.client.test.functional.ConsumerPriorities

All source code are property of their respective owners. Java is a trademark of Sun Microsystems, Inc and owned by ORACLE Inc. Contact coftware#gmail.com.