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.

        assertNotNull(basicGet(Q));
    }




    public void testOverlappingAlarmsFlowControl() throws IOException, InterruptedException {
        QueueingConsumer c = new QueueingConsumer(channel);
        String consumerTag = channel.basicConsume(Q, true, c);


        setResourceAlarm("memory");
        basicPublishVolatile(Q);


        assertNull(c.nextDelivery(100));
        setResourceAlarm("disk");
        assertNull(c.nextDelivery(100));
        clearResourceAlarm("memory");
        assertNull(c.nextDelivery(100));
        clearResourceAlarm("disk");
        assertNotNull(c.nextDelivery());


        channel.basicCancel(consumerTag);
        basicPublishVolatile(Q);
        assertNotNull(basicGet(Q));
    }

View Full Code Here

    public void testConsumerCancellationNotification() throws IOException,
            InterruptedException {
        final BlockingQueue<Boolean> result = new ArrayBlockingQueue<Boolean>(1);


        channel.queueDeclare(queue, false, true, false, null);
        Consumer consumer = new QueueingConsumer(channel) {
            @Override
            public void handleCancel(String consumerTag) throws IOException {
                try {
                    result.put(true);
                } catch (InterruptedException e) {

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    public void testConsumerCancellationInterruptsQueuingConsumerWait()
            throws IOException, InterruptedException {
        final BlockingQueue<Boolean> result = new ArrayBlockingQueue<Boolean>(1);
        channel.queueDeclare(queue, false, true, false, null);
        final QueueingConsumer consumer = new QueueingConsumer(channel);
        Runnable receiver = new Runnable() {


            public void run() {
                try {
                    try {
                        consumer.nextDelivery();
                    } catch (ConsumerCancelledException e) {
                        result.put(true);
                        return;
                    } catch (ShutdownSignalException e) {
                    } catch (InterruptedException e) {

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        basicPublishVolatile(m1, q);
        basicPublishVolatile(m2, q);


        long tag1 = checkDelivery(channel.basicGet(q, false), m1, false);
        long tag2 = checkDelivery(channel.basicGet(q, false), m2, false);
        QueueingConsumer c = new QueueingConsumer(secondaryChannel);
        String consumerTag = secondaryChannel.basicConsume(q, false, c);
        channel.basicReject(tag2, true);
        long tag3 = checkDelivery(c.nextDelivery(), m2, true);
        secondaryChannel.basicCancel(consumerTag);
        secondaryChannel.basicReject(tag3, false);
        assertNull(channel.basicGet(q, false));
        channel.basicAck(tag1, false);
        channel.basicReject(tag3, false);

View Full Code Here

      queueNames = new String[j];
      for (int i = 0; i < j; i++) {
        queueNames[i] = randomString();
        channel.queueDeclare(queueNames[i], durable, false, false, null);
        channel.queueBind(queueNames[i], binding.x, binding.k);
        channel.basicConsume(queueNames[i], true, new QueueingConsumer(channel));
      }
    }
    subscribeSendUnsubscribe(binding);
    if (durable) {
      restart();
    }
    if (queues > 1) {
      for (String s : queueNames) {
        channel.basicConsume(s, true, new QueueingConsumer(channel));
        Binding tmp = new Binding(s, binding.x, binding.k);
        sendUnroutable(tmp);
      }
    }
    channel.queueDeclare(binding.q, durable, true, true, null);

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    createQueueAndBindToExchange(binding, durable);
    return binding;
  }


  protected void subscribeSendUnsubscribe(Binding binding) throws IOException {
    String tag = channel.basicConsume(binding.q, new QueueingConsumer(channel));
    sendUnroutable(binding);
    channel.basicCancel(tag);
  }

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    public void testConsume()
        throws IOException
    {
        runTest(false, false, true, false, new WithName() {
                public void with(String name) throws IOException {
                    channel.basicConsume(name, new QueueingConsumer(channel));
                }});
    }

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        redeclare(q, chan);


        trace("Beginning plateau of " + repeatCount + " repeats, sampling every " + sampleGranularity + " messages");


        QueueingConsumer consumer = new QueueingConsumer(chan);
        chan.basicConsume(q, consumer);


        long startTime = System.currentTimeMillis();
        for (int i = 0; i < repeatCount; i++) {
            if (((i % sampleGranularity) == 0) && (i > 0)) {
                long now = System.currentTimeMillis();
                double delta = 1000 * (now - startTime) / (double) sampleGranularity;
                plateauSampleTimes.add(now);
                plateauSampleDeltas.add(delta);
                System.out.print(String.format("# %3d%%; %012d --> %g microseconds/roundtrip            \r",
                                    (100 * i / repeatCount),
                                    now,
                                    delta));
                startTime = System.currentTimeMillis();
            }
            chan.basicPublish("", q, props, body);
            QueueingConsumer.Delivery d = consumer.nextDelivery();
            chan.basicAck(d.getEnvelope().getDeliveryTag(), false);
        }
        System.out.println();


        trace("Switching QOS to unlimited");
        chan.basicQos(0);


        trace("Draining backlog");
        for (int i = 0; i < backlogSize; i++) {
            QueueingConsumer.Delivery d = consumer.nextDelivery();
            chan.basicAck(d.getEnvelope().getDeliveryTag(), false);
        }


        redeclare(q, chan);

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    /*
     * Test expiry of requeued messages after being consumed instantly
     */
    public void testExpiryWithRequeueAfterConsume() throws Exception {
        declareAndBindQueue(100);
        QueueingConsumer c = new QueueingConsumer(channel);
        channel.basicConsume(TTL_QUEUE_NAME, c);


        publish(MSG[0]);
        assertNotNull(c.nextDelivery(100));


        closeChannel();
        Thread.sleep(150);
        openChannel();

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        // when there is no consumer, message should expire
        publish(MSG[0]);
        assertNull(get());


        // when there is a consumer, message should be delivered
        QueueingConsumer c = new QueueingConsumer(channel);
        channel.basicConsume(TTL_QUEUE_NAME, c);
        publish(MSG[0]);
        Delivery d = c.nextDelivery(100);
        assertNotNull(d);


        // requeued messages should expire
        channel.basicReject(d.getEnvelope().getDeliveryTag(), true);
        assertNull(c.nextDelivery(100));
    }

View Full Code Here

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