How to use JTA

Its quite tricky...

This will enable you to use JCA driven XA transactions for message delivery, outside a J2EE container. It will also allow outbound JMS messages to fall into those transactions.
This has only been tested with ActiveMQ using JOTM as the transaction manager.
public class JcaJmsConnection {

    private Map<Integer, ActivationInfo> activationMap = new HashMap<Integer, ActivationInfo>();
    private AtomicInteger activationCounter = new AtomicInteger();

    private final String nameForDisplayPurposes;
    private final TransactionManager transactionManager;
    private ErrorHandler errorHandler;
    private String brokerUrl;
    private ConnectionFactory connectionFactory;

    public JcaJmsConnection(TransactionManager transactionManager, ErrorHandler errorHandler, String brokerUrl) throws Exception {
        this("Unknown", transactionManager, errorHandler, brokerUrl);
    }

    public JcaJmsConnection(String nameForDisplayPurposes, TransactionManager transactionManager, ErrorHandler errorHandler, String brokerUrl) throws Exception {
        this.nameForDisplayPurposes = nameForDisplayPurposes;
        this.transactionManager = transactionManager;
        this.errorHandler = errorHandler;
        this.brokerUrl = brokerUrl;
        this.connectionFactory = createManagedConnectionFactory();
    }

    public Connection getConnection() throws JMSException {
        return connectionFactory.createConnection();
    }

    private ConnectionFactory createManagedConnectionFactory() throws Exception {
        ActiveMQManagedConnectionFactory managedConnectionFactory = new ActiveMQManagedConnectionFactory();
        managedConnectionFactory.setResourceAdapter(new ActiveMQResourceAdapter() {
            {
                setServerUrl(brokerUrl);
            }
        });

        ConnectionManagerFactoryBean connectionManagerFactory = new ConnectionManagerFactoryBean();
        connectionManagerFactory.setTransactionManager(transactionManager);
        connectionManagerFactory.setPooling(true);
        connectionManagerFactory.setTransactionSupport(new XATransactions(false, true));

        connectionManagerFactory.afterPropertiesSet();
        ConnectionManager connectionManager = (ConnectionManager) connectionManagerFactory.getObject();

        return (ConnectionFactory) managedConnectionFactory.createConnectionFactory(connectionManager);
    }

    /**
     * Give this method the activation number you got from setartupMessageListener
     * @param activationNumber
     */
    public void shutdownMessageListener(int activationNumber) {
        ActivationInfo activationInfo = activationMap.get(activationNumber);
        if ( activationInfo == null ) {
            throw new Bug("Can't find an activation with id " + activationNumber);
        }
        activationInfo.resourceAdapter.endpointDeactivation(activationInfo.messageEndpointFactory, activationInfo.activationSpec);
    }

    /**
     * This only works with JOTM.
     */
    public int startUpMessageListener(String queueName, MessageListener messageListener, int workerThreadCount) throws Exception {
        return startUpMessageListener(((Current) transactionManager).getXATerminator(), queueName, messageListener, workerThreadCount) ;
    }

    /**
     * Start up multithreaded messagelistener, return activationnumber that you will need to shut it down again.
     */
    public int startUpMessageListener(XATerminator xaTerminator, String queueName, MessageListener messageListener, int workerThreadCount) throws Exception {
        ExecutorService threadPool = Executors.newFixedThreadPool(workerThreadCount);

        // The Geronimo code does not actually use the XAWork interface when used like this, so we don't need to create it.
        GeronimoWorkManager workManager = new GeronimoWorkManager(threadPool, threadPool, threadPool, null);
        BootstrapContext bootstrapContext = new GeronimoBootstrapContext(workManager, xaTerminator);

        ActiveMQResourceAdapter resourceAdapter = new ActiveMQResourceAdapter();
        resourceAdapter.setServerUrl(brokerUrl);

        resourceAdapter.start(bootstrapContext);

        ActiveMQActivationSpec activationSpec = new ActiveMQActivationSpec();
        activationSpec.setDestination(queueName);
        activationSpec.setDestinationType("javax.jms.Queue");
        activationSpec.setResourceAdapter(resourceAdapter);
        activationSpec.setInitialRedeliveryDelay(100);
        activationSpec.setMaximumRedeliveries(2);

        //TODO Jamesr Allow message selectors.
        // activationSpec.setMessageSelector(messsageSelector);

        MessageEndpointFactory messageEndpointFactory = new NamingEndpointFactory(transactionManager, messageListener);
        resourceAdapter.endpointActivation(messageEndpointFactory, activationSpec);

        ActivationInfo activationInfo = new ActivationInfo(resourceAdapter, activationSpec, messageEndpointFactory);

        int activationNumber = activationCounter.incrementAndGet();
        activationMap.put(activationNumber, activationInfo);

        return activationNumber;
    }

    public static class ActivationInfo {
        public MessageEndpointFactory messageEndpointFactory;
        public ActivationSpec activationSpec;
        public ResourceAdapter resourceAdapter;

        public ActivationInfo(ResourceAdapter resourceAdapter, ActivationSpec activationSpec, MessageEndpointFactory messageEndpointFactory) {
            this.messageEndpointFactory = messageEndpointFactory;
            this.activationSpec = activationSpec;
            this.resourceAdapter = resourceAdapter;
        }
    }

    public static class NamingEndpointFactory implements MessageEndpointFactory {

        private final TransactionManager transactionManager;
        private MessageListener messageListener;

        public NamingEndpointFactory(TransactionManager transactionManager, MessageListener messageListener) {
            this.transactionManager = transactionManager;
            this.messageListener = messageListener;
        }

        public MessageEndpoint createEndpoint(XAResource xaResource) throws UnavailableException {
            NamedXAResource r = new WrapperNamedXAResource(xaResource, "hello");
            return new XAEndpoint(messageListener, r, transactionManager);
        }

        public boolean isDeliveryTransacted(Method method) throws NoSuchMethodException {
            return true;
        }
    }
How to use JTA

Its quite tricky...

Comments ( Hide )

Examples

Description

Browse Space

Explore Confluence

Your Account

Other Features

Add Content
