Examples of org.apache.activemq.ActiveMQMessageConsumer

org.apache.activemq.ActiveMQMessageConsumer
A client uses a MessageConsumer object to receive messages from a destination. A MessageConsumer object is created by passing a Destination object to a message-consumer creation method supplied by a session.
MessageConsumer is the parent interface for all message consumers.
A message consumer can be created with a message selector. A message selector allows the client to restrict the messages delivered to the message consumer to those that match the selector.
A client may either synchronously receive a message consumer's messages or have the consumer asynchronously deliver them as they arrive.
For synchronous receipt, a client can request the next message from a message consumer using one of its receive methods. There are several variations of receive that allow a client to poll or wait for the next message.
For asynchronous delivery, a client can register a MessageListener object with a message consumer. As messages arrive at the message consumer, it delivers them by calling the MessageListener's onMessage method.
It is a client programming error for a MessageListener to throw an exception. @version $Revision: 1.22 $ @see javax.jms.MessageConsumer @see javax.jms.QueueReceiver @see javax.jms.TopicSubscriber @see javax.jms.Session

        connectionFactory.setPrefetchPolicy(prefetchPolicy);
        Connection c = connectionFactory.createConnection();
        connections.add(c);
        c.start();
        Session session = c.createSession(false, Session.CLIENT_ACKNOWLEDGE);
        final ActiveMQMessageConsumer messageconsumer = (ActiveMQMessageConsumer) session.createConsumer(destination);
        startProducers(destination, 10);


        messageconsumer.receive(4000).acknowledge();
        assertNotNull(messageconsumer.receive(4000));
        assertNotNull(messageconsumer.receive(4000));
        assertNotNull(messageconsumer.receive(4000));


        // close control command won't get through
        socketProxy.pause();


        ActiveMQDestination amqDest = (ActiveMQDestination)destination;
        ObjectName destinationViewMBean = new ObjectName("org.apache.activemq:destinationType=" +
                (amqDest.isTopic() ? "Topic" : "Queue") +",destinationName="
                + amqDest.getPhysicalName() + ",type=Broker,brokerName=localhost");


        final DestinationViewMBean destView = (DestinationViewMBean) broker.getManagementContext().newProxyInstance(destinationViewMBean, DestinationViewMBean.class, true);


        assertTrue("Consumer gone from broker view", Wait.waitFor(new Wait.Condition() {
            @Override
            public boolean isSatisified() throws Exception {
                LOG.info("DestView {} comsumerCount {}", destView, destView.getConsumerCount());
                return 0 == destView.getConsumerCount();
            }
        }));


        socketProxy.goOn();


        assertTrue("consumer was closed", Wait.waitFor(new Wait.Condition() {
            @Override
            public boolean isSatisified() throws Exception {
                boolean closed = false;
                try {
                    messageconsumer.receive(400);
                } catch (javax.jms.IllegalStateException expected) {
                    closed = expected.toString().contains("closed");
                }
                return closed;
            }

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        // lets make a snapshot before we process them
        Object[] consumerArray = consumers.toArray();
        int size = consumerArray.length;
        JMSConsumerStatsImpl[] answer = new JMSConsumerStatsImpl[size];
        for (int i = 0; i < size; i++) {
            ActiveMQMessageConsumer consumer = (ActiveMQMessageConsumer)consumerArray[i];
            answer[i] = consumer.getConsumerStats();
        }
        return answer;
    }

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