Examples of org.apache.activemq.ActiveMQSession

org.apache.activemq.ActiveMQSession
A Session object is a single-threaded context for producing and consuming messages. Although it may allocate provider resources outside the Java virtual machine (JVM), it is considered a lightweight JMS object.
A session serves several purposes:
- It is a factory for its message producers and consumers.
- It supplies provider-optimized message factories.
- It is a factory for TemporaryTopics and TemporaryQueues.
- It provides a way to create Queue or Topic objects for those clients that need to dynamically manipulate provider-specific destination names.
- It supports a single series of transactions that combine work spanning its producers and consumers into atomic units.
- It defines a serial order for the messages it consumes and the messages it produces.
- It retains messages it consumes until they have been acknowledged.
- It serializes execution of message listeners registered with its message consumers.
- It is a factory for QueueBrowsers.
A session can create and service multiple message producers and consumers.
One typical use is to have a thread block on a synchronous MessageConsumer until a message arrives. The thread may then use one or more of the Session'sMessageProducers.
If a client desires to have one thread produce messages while others consume them, the client should use a separate session for its producing thread.
Once a connection has been started, any session with one or more registered message listeners is dedicated to the thread of control that delivers messages to it. It is erroneous for client code to use this session or any of its constituent objects from another thread of control. The only exception to this rule is the use of the session or connection close method.
It should be easy for most clients to partition their work naturally into sessions. This model allows clients to start simply and incrementally add message processing complexity as their need for concurrency grows.
The close method is the only session method that can be called while some other session method is being executed in another thread.
A session may be specified as transacted. Each transacted session supports a single series of transactions. Each transaction groups a set of message sends and a set of message receives into an atomic unit of work. In effect, transactions organize a session's input message stream and output message stream into series of atomic units. When a transaction commits, its atomic unit of input is acknowledged and its associated atomic unit of output is sent. If a transaction rollback is done, the transaction's sent messages are destroyed and the session's input is automatically recovered.
The content of a transaction's input and output units is simply those messages that have been produced and consumed within the session's current transaction.
A transaction is completed using either its session's commit method or its session's rollback method. The completion of a session's current transaction automatically begins the next. The result is that a transacted session always has a current transaction within which its work is done.
The Java Transaction Service (JTS) or some other transaction monitor may be used to combine a session's transaction with transactions on other resources (databases, other JMS sessions, etc.). Since Java distributed transactions are controlled via the Java Transaction API (JTA), use of the session's commit and rollback methods in this context is prohibited.
The JMS API does not require support for JTA; however, it does define how a provider supplies this support.
Although it is also possible for a JMS client to handle distributed transactions directly, it is unlikely that many JMS clients will do this. Support for JTA in the JMS API is targeted at systems vendors who will be integrating the JMS API into their application server products. @version $Revision: 1.34 $ @see javax.jms.Session @see javax.jms.QueueSession @see javax.jms.TopicSession @see javax.jms.XASession


        // Create consumer on separate connection
        ActiveMQConnection consumerConnection = (ActiveMQConnection) cf.createConnection();
        consumerConnection.setMessagePrioritySupported(true);
        consumerConnection.start();
        final ActiveMQSession consumerSession = (ActiveMQSession) consumerConnection.createSession(true,
                Session.SESSION_TRANSACTED);
        consumer = (ActiveMQMessageConsumer) consumerSession.createConsumer(dest);


        // Produce X number of messages with a session commit after each message
        Random random = new Random();
        for (int i = 0; i < messageCount; ++i) {


            Message message = producerSession.createTextMessage("Test message #" + i);
            producer.send(message, DeliveryMode.PERSISTENT, random.nextInt(10), 45*1000);
            producerSession.commit();
        }
        producer.close();


        // ***************************************************
        // If we create the consumer here instead of above, the
        // the messages will be consumed in priority order
        // ***************************************************
        //consumer = (ActiveMQMessageConsumer) consumerSession.createConsumer(dest);


        // Consume all of the messages we produce using a listener.
        // Don't exit until we get all the messages.
        final CountDownLatch latch = new CountDownLatch(messageCount);
        final StringBuffer failureMessage = new StringBuffer();
        consumer.setMessageListener(new MessageListener() {
            int lowestPrioritySeen = 10;


            boolean firstMessage = true;


            public void onMessage(Message msg) {
                try {


                    int currentPriority = msg.getJMSPriority();
                    LOG.debug(currentPriority + "<=" + lowestPrioritySeen);


                    // Ignore the first message priority since it is prefetched
                    // and is out of order by design
                    if (firstMessage == true) {
                        firstMessage = false;
                        LOG.debug("Ignoring first message since it was prefetched");


                    } else {


                        // Verify that we never see a priority higher than the
                        // lowest
                        // priority seen
                        if (lowestPrioritySeen > currentPriority) {
                            lowestPrioritySeen = currentPriority;
                        }
                        if (lowestPrioritySeen < currentPriority) {
                            failureMessage.append("Incorrect priority seen (Lowest Priority = " + lowestPrioritySeen
                                    + " Current Priority = " + currentPriority + ")"
                                    + System.getProperty("line.separator"));
                        }
                    }


                } catch (JMSException e) {
                    e.printStackTrace();
                } finally {
                    latch.countDown();
                    LOG.debug("Messages remaining = " + latch.getCount());
                }
            }
        });


        latch.await();
        consumer.close();


        // Cleanup producer resources
        producerSession.close();
        producerConnection.stop();
        producerConnection.close();


        // Cleanup consumer resources
        consumerSession.close();
        consumerConnection.stop();
        consumerConnection.close();


        // Report the failure if found
        if (failureMessage.length() > 0) {

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        public void send() throws Exception{
            ActiveMQConnectionFactory connectionFactory = new ActiveMQConnectionFactory(user, password, uri);
            ActiveMQConnection connection = (ActiveMQConnection)connectionFactory.createConnection();
            connection.start();


            ActiveMQSession session = (ActiveMQSession)connection.createSession(transacted, Session.AUTO_ACKNOWLEDGE);
            Destination destination = session.createTopic("topic2");
            MessageProducer producer = session.createProducer(destination);
            producer.setDeliveryMode(DeliveryMode.PERSISTENT);
            for(int i=0;i<100;i++){
                TextMessage om=session.createTextMessage("hello from producer");
                producer.send(om);
            }
            producer.close();
            session.close();
            connection.close();
        }

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        waitForBridgeFormation(b, 1, 0);


        ActiveMQConnectionFactory sendFactory = createConnectionFactory(a);
        ActiveMQConnection sendConnection = createConnection(sendFactory);


        ActiveMQSession sendSession = (ActiveMQSession)sendConnection.createSession(false, Session.AUTO_ACKNOWLEDGE);
        MessageProducer producer = sendSession.createProducer(sendQ);
        ActiveMQTempQueue realReplyQ = (ActiveMQTempQueue) sendSession.createTemporaryQueue();
        TextMessage message = sendSession.createTextMessage("1");
        message.setJMSReplyTo(realReplyQ);
        producer.send(message);
        LOG.info("request sent");


        // responder
        ActiveMQConnectionFactory consumerFactory = createConnectionFactory(b);
        ActiveMQConnection consumerConnection = createConnection(consumerFactory);


        ActiveMQSession consumerSession = (ActiveMQSession)consumerConnection.createSession(false, Session.AUTO_ACKNOWLEDGE);
        MessageConsumer consumer = consumerSession.createConsumer(sendQ);
        TextMessage received = (TextMessage) consumer.receive(receiveTimeout);
        assertNotNull("got request from sender ok", received);


        LOG.info("got request, sending reply");


        MessageProducer consumerProducer = consumerSession.createProducer(received.getJMSReplyTo());
        consumerProducer.send(consumerSession.createTextMessage("got " + received.getText()));
        // temp dest on reply broker tied to this connection, setOptimizedDispatch=true ensures
        // message gets delivered before destination is removed
        consumerConnection.close();


        // reply consumer

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        public static boolean recover(final ActiveMQResourceManager rm) throws IOException {
            if (isRecoverable(rm)) {
                try {
                    final ActiveMQConnectionFactory connFactory = (ActiveMQConnectionFactory) rm.getConnectionFactory();
                    ActiveMQConnection activeConn = (ActiveMQConnection)connFactory.createConnection();
                    final ActiveMQSession session = (ActiveMQSession)activeConn.createSession(true, Session.SESSION_TRANSACTED);
                    NamedXAResource namedXaResource = new WrapperNamedXAResource(session.getTransactionContext(), rm.getResourceName());


                    RecoverableTransactionManager rtxManager = (RecoverableTransactionManager) rm.getTransactionManager();
                    rtxManager.registerNamedXAResourceFactory(new NamedXAResourceFactory() {


                        @Override
                        public String getName() {
                            return rm.getResourceName();
                        }


                        @Override
                        public NamedXAResource getNamedXAResource() throws SystemException {
                            try {
                                final ActiveMQConnection activeConn = (ActiveMQConnection)connFactory.createConnection();
                                final ActiveMQSession session = (ActiveMQSession)activeConn.createSession(true, Session.SESSION_TRANSACTED);
                                activeConn.start();
                                LOGGER.debug("new namedXAResource's connection: " + activeConn);


                                return new ConnectionAndWrapperNamedXAResource(session.getTransactionContext(), getName(), activeConn);
                            } catch (Exception e) {
                                SystemException se =  new SystemException("Failed to create ConnectionAndWrapperNamedXAResource, " + e.getLocalizedMessage());
                                se.initCause(e);
                                LOGGER.error(se.getLocalizedMessage(), se);
                                throw se;

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                    session.getInternalSession().close();
                }


                @Override
                public PooledSession makeObject(SessionKey key) throws Exception {
                    ActiveMQSession session = (ActiveMQSession)
                            ConnectionPool.this.connection.createSession(key.isTransacted(), key.getAckMode());
                    return new PooledSession(key, session, sessionPool);
                }


                @Override

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        public void run() {


            ActiveMQConnectionFactory connectionFactory = null;
            ActiveMQConnection connection = null;
            ActiveMQSession session = null;
            Destination destination = null;


            try {
                LOG.info("Started TestProducer for destination (" + destinationName + ")");


                connectionFactory = new ActiveMQConnectionFactory(jmsConnectionURI);
                connection = (ActiveMQConnection) connectionFactory.createConnection();
                connection.setCopyMessageOnSend(false);
                connection.start();
                session = (ActiveMQSession) connection.createSession(false, Session.AUTO_ACKNOWLEDGE);


                destination = session.createQueue(this.destinationName);


                // Create a MessageProducer from the Session to the Topic or Queue
                ActiveMQMessageProducer producer = (ActiveMQMessageProducer) session.createProducer(destination);
                producer.setDeliveryMode(DeliveryMode.NON_PERSISTENT);


                for (int i = 0; i < (producerMessages); i++) {
                    TextMessage message = (TextMessage) session.createTextMessage();
                    message.setLongProperty("TestTime", (System.currentTimeMillis()));
                    try {
                        producer.send(message);
                        LOG.info("Producer (" + destinationName + ")\n" + message.getJMSMessageID() + " = sent messageId\n");


                        latch.countDown();
                        LOG.info(" Latch count  " + latch.getCount());
                        LOG.info("Producer message list size = " + messageList.keySet().size());
                        messageList.put(message.getJMSMessageID(), new AtomicInteger(0));
                        LOG.info("Producer message list size = " + messageList.keySet().size());


                    } catch (Exception deeperException) {
                        LOG.info("Producer for destination (" + destinationName + ") Caught: " + deeperException);
                    }


                    Thread.sleep(1000);
                }


                LOG.info("Finished TestProducer for destination (" + destinationName + ")");


            } catch (Exception e) {
                LOG.error("Terminating TestProducer(" + destinationName + ")Caught: " + e);
            } finally {
                try {
                    if (session != null) {
                        session.close();
                    }
                    if (connection != null) {
                        connection.close();
                    }
                } catch (Exception e) {

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            // check if we should use a blob message here
            if (useBlob) { 
                MimeMessage mm = mail.getMessage();
                MimeMessage wrapper = mm;
                
                ActiveMQSession amqSession = getAMQSession(session);
                
                if (wrapper instanceof MimeMessageCopyOnWriteProxy) {
                    wrapper = ((MimeMessageCopyOnWriteProxy)mm).getWrappedMessage();
                }
                BlobMessage blobMessage = null;
                if (wrapper instanceof MimeMessageWrapper) {
                    URL blobUrl = (URL) mail.getAttribute(JAMES_BLOB_URL);
                    String fromQueue = (String) mail.getAttribute(JAMES_QUEUE_NAME);
                    MimeMessageWrapper mwrapper = (MimeMessageWrapper) wrapper;


                    if (blobUrl != null && fromQueue != null && fromQueue.equals(queuename) && mwrapper.isModified() == false ) {
                        // the message content was not changed so don't need to upload it again and can just point to the url
                        blobMessage = amqSession.createBlobMessage(blobUrl);
                    
                        // thats important so we don't delete the blob file after complete the processing!
                        mail.setAttribute(JAMES_REUSE_BLOB_URL, true);
                    
                    }


                }
                if (blobMessage == null) {
                    // just use the MimeMessageInputStream which can read every MimeMessage implementation
                    blobMessage = amqSession.createBlobMessage(new MimeMessageInputStream(wrapper));
                }
            
                // store the queue name in the props
                props.put(JAMES_QUEUE_NAME, queuename);

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     * @param session
     * @return amqSession
     * @throws JMSException
     */
    protected ActiveMQSession getAMQSession(Session session) throws JMSException {
        ActiveMQSession amqSession;
        
        if (session instanceof SessionProxy) {
            // handle Springs CachingConnectionFactory 
            amqSession = (ActiveMQSession) ((SessionProxy) session).getTargetSession();
        } else {

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    }


    protected void useConnectionWithBlobMessage(Connection connection) throws Exception {
        connection.setClientID(clientID);
        connection.start();
        ActiveMQSession session = (ActiveMQSession) connection.createSession(transacted, authMode);
        destination = createDestination();
        MessageProducer producer = session.createProducer(destination);
        for (int i = 0; i < MESSAGE_COUNT; i++) {
            BlobMessage message = session.createBlobMessage(new URL("http://foo.bar/test"));
            message.setIntProperty("counter", i);
            message.setJMSCorrelationID("MyCorrelationID");
            message.setJMSReplyTo(new ActiveMQQueue("MyReplyTo"));
            message.setJMSType("MyType");
            message.setJMSPriority(5);

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    }


    protected void useConnectionWithByteMessage(Connection connection) throws Exception {
        connection.setClientID(clientID);
        connection.start();
        ActiveMQSession session = (ActiveMQSession) connection.createSession(transacted, authMode);
        destination = createDestination();
        MessageProducer producer = session.createProducer(destination);
        for (int i = 0; i < MESSAGE_COUNT; i++) {
            BytesMessage message = session.createBytesMessage();
            message.writeBytes(("Message: " + i).getBytes());
            message.setIntProperty("counter", i);
            message.setJMSCorrelationID("MyCorrelationID");
            message.setJMSReplyTo(new ActiveMQQueue("MyReplyTo"));
            message.setJMSType("MyType");

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