Example usage for javax.jms QueueSession createConsumer

Introduction

In this page you can find the example usage for javax.jms QueueSession createConsumer.

Prototype

MessageConsumer createConsumer(Destination destination, java.lang.String messageSelector) throws JMSException;

Source Link

Document

Creates a MessageConsumer for the specified destination, using a message selector.

Usage

From source file:org.dawnsci.commandserver.core.producer.ProcessConsumer.java

/**
 * Parse the queue for stale jobs and things that should be rerun.
 * @param bean/*from   w  w w. ja  v a  2s . c o  m*/
 * @throws Exception 
 */
private void processStatusQueue(URI uri, String statusQName) throws Exception {

    QueueConnection qCon = null;

    try {
        QueueConnectionFactory connectionFactory = ConnectionFactoryFacade.createConnectionFactory(uri);
        qCon = connectionFactory.createQueueConnection();
        QueueSession qSes = qCon.createQueueSession(false, Session.AUTO_ACKNOWLEDGE);
        Queue queue = qSes.createQueue(statusQName);
        qCon.start();

        QueueBrowser qb = qSes.createBrowser(queue);

        @SuppressWarnings("rawtypes")
        Enumeration e = qb.getEnumeration();

        ObjectMapper mapper = new ObjectMapper();

        Map<String, StatusBean> failIds = new LinkedHashMap<String, StatusBean>(7);
        List<String> removeIds = new ArrayList<String>(7);
        while (e.hasMoreElements()) {
            Message m = (Message) e.nextElement();
            if (m == null)
                continue;
            if (m instanceof TextMessage) {
                TextMessage t = (TextMessage) m;

                try {
                    @SuppressWarnings("unchecked")
                    final StatusBean qbean = mapper.readValue(t.getText(), getBeanClass());
                    if (qbean == null)
                        continue;
                    if (qbean.getStatus() == null)
                        continue;
                    if (!qbean.getStatus().isStarted()) {
                        failIds.put(t.getJMSMessageID(), qbean);
                        continue;
                    }

                    // If it has failed, we clear it up
                    if (qbean.getStatus() == Status.FAILED) {
                        removeIds.add(t.getJMSMessageID());
                        continue;
                    }
                    if (qbean.getStatus() == Status.NONE) {
                        removeIds.add(t.getJMSMessageID());
                        continue;
                    }

                    // If it is running and older than a certain time, we clear it up
                    if (qbean.getStatus() == Status.RUNNING) {
                        final long submitted = qbean.getSubmissionTime();
                        final long current = System.currentTimeMillis();
                        if (current - submitted > getMaximumRunningAge()) {
                            removeIds.add(t.getJMSMessageID());
                            continue;
                        }
                    }

                    if (qbean.getStatus().isFinal()) {
                        final long submitted = qbean.getSubmissionTime();
                        final long current = System.currentTimeMillis();
                        if (current - submitted > getMaximumCompleteAge()) {
                            removeIds.add(t.getJMSMessageID());
                        }
                    }

                } catch (Exception ne) {
                    System.out.println("Message " + t.getText() + " is not legal and will be removed.");
                    removeIds.add(t.getJMSMessageID());
                }
            }
        }

        // We fail the non-started jobs now - otherwise we could
        // actually start them late. TODO check this
        final List<String> ids = new ArrayList<String>();
        ids.addAll(failIds.keySet());
        ids.addAll(removeIds);

        if (ids.size() > 0) {

            for (String jMSMessageID : ids) {
                MessageConsumer consumer = qSes.createConsumer(queue, "JMSMessageID = '" + jMSMessageID + "'");
                Message m = consumer.receive(1000);
                if (removeIds.contains(jMSMessageID))
                    continue; // We are done

                if (m != null && m instanceof TextMessage) {
                    MessageProducer producer = qSes.createProducer(queue);
                    final StatusBean bean = failIds.get(jMSMessageID);
                    bean.setStatus(Status.FAILED);
                    producer.send(qSes.createTextMessage(mapper.writeValueAsString(bean)));

                    System.out.println("Failed job " + bean.getName() + " messageid(" + jMSMessageID + ")");

                }
            }
        }
    } finally {
        if (qCon != null)
            qCon.close();
    }

}

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