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.

    public void testQueueAutoDelete() throws IOException {
        String name = "tempqueue";
        channel.queueDeclare(name, false, false, true, null);
        // now it's there
        verifyQueue(name, false, false, true, null);
        QueueingConsumer consumer = new QueueingConsumer(channel);
        String consumerTag = channel.basicConsume(name, consumer);
        channel.basicCancel(consumerTag);
        // now it's not .. we hope
        try {
            verifyQueueExists(name);

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    public void testExclusiveNotAutoDelete() throws IOException {
        String name = "exclusivequeue";
        channel.queueDeclare(name, false, true, false, null);
        // now it's there
        verifyQueue(name, false, true, false, null);
        QueueingConsumer consumer = new QueueingConsumer(channel);
        String consumerTag = channel.basicConsume(name, consumer);
        channel.basicCancel(consumerTag);
        // and still there, because exclusive no longer implies autodelete
        verifyQueueExists(name);
    }

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        throws IOException, InterruptedException, ShutdownSignalException
    {
        openConnection();
        open();
        injectMessage();
        QueueingConsumer c = new QueueingConsumer(channel);
        channel.basicConsume(Q, c);
        c.nextDelivery();
        close();
        Thread.sleep(GRATUITOUS_DELAY);
        open();
        assertNotNull(getMessage());
        close();

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        channel.queueDelete(Q);
        channel.queueDeclare(Q, false, false, false, null);
        for (int i = 0; i < MESSAGE_COUNT; i++) {
            channel.basicPublish("", Q, null, "in flight message".getBytes());
        }
        QueueingConsumer c = new QueueingConsumer(channel);
        channel.basicConsume(Q, c);
        c.nextDelivery();
        close();
        open();
        for (int i = 0; i < MESSAGE_COUNT; i++) {
            GetResponse r = channel.basicGet(Q, true);
            assertNotNull("only got " + i + " out of " + MESSAGE_COUNT +

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        }
        fail("Active queue declaration of an exclusive queue from another connection should fail");
    }


    public void testQueueExclusiveForConsume() throws Exception {
        QueueingConsumer c = new QueueingConsumer(channel);
        try {
            channel.basicConsume(q, c);
        } catch (IOException ioe) {
            checkShutdownSignal(AMQP.RESOURCE_LOCKED, ioe);
            return;

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                for(int i = 0; i < MESSAGE_COUNT; i++) {
                    channel.basicPublish("", queueName,
                                         MessageProperties.BASIC, MESSAGE);
                }


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


                long publishTime = System.nanoTime() - start;


                start = System.nanoTime();


                for(int i = 0; i < MESSAGE_COUNT; i++){
                    consumer.nextDelivery();
                }


                long consumeTime = System.nanoTime() - start;


                double publishRate =

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    }


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

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    }


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

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    public void testNoAckObeysLimit()
        throws IOException
    {
        channel.basicQos(1);
        QueueingConsumer c1 = new QueueingConsumer(channel);
        declareBindConsume(channel, c1, false);
        fill(1);
        QueueingConsumer c2 = new QueueingConsumer(channel);
        declareBindConsume(channel, c2, true);
        fill(1);
        try {
            Delivery d = c2.nextDelivery(1000);
            assertNull(d);
        } catch (InterruptedException ie) {
            fail("interrupted");
        }
        Queue<Delivery> d = drain(c1, 1);

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    }


    public void testFairness()
        throws IOException
    {
        QueueingConsumer c = new QueueingConsumer(channel);
        final int queueCount = 3;
        final int messageCount = 100;
        List<String> queues = configure(c, 1, queueCount, messageCount);


        for (int i = 0; i < messageCount - 1; i++) {

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