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

        
        final int messageCount = Queue.MAX_PAGE_SIZE + 10;
        final CountDownLatch latch = new CountDownLatch(1);
        
        serverSession = serverConnection.createSession(false, Session.AUTO_ACKNOWLEDGE);
        ActiveMQSession s = (ActiveMQSession) serverSession;
        s.setSessionAsyncDispatch(true);
        
        MessageConsumer serverConsumer = serverSession.createConsumer(serverDestination);
        serverConsumer.setMessageListener(new MessageListener() {
           
            public void onMessage(Message msg) {

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        String content = "hello world " + System.currentTimeMillis();
        BufferedWriter writer = new BufferedWriter(new FileWriter(file));
        writer.append(content);
        writer.close();


        ActiveMQSession session = (ActiveMQSession) connection.createSession(
                false, Session.AUTO_ACKNOWLEDGE);
        MessageProducer producer = session.createProducer(destination);
        MessageConsumer consumer = session.createConsumer(destination);
        BlobMessage message = session.createBlobMessage(file);


        producer.send(message);
        Thread.sleep(1000);


        // check message send

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        // lets make a snapshot before we process them
        Object[] sessionArray = sessions.toArray();
        int size = sessionArray.length;
        JMSSessionStatsImpl[] answer = new JMSSessionStatsImpl[size];
        for (int i = 0; i < size; i++) {
            ActiveMQSession session = (ActiveMQSession)sessionArray[i];
            answer[i] = session.getSessionStats();
        }
        return answer;
    }

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    }


    private ServerSessionImpl createServerSessionImpl() throws JMSException {
        MessageActivationSpec activationSpec = activeMQAsfEndpointWorker.endpointActivationKey.getActivationSpec();
        int acknowledge = (activeMQAsfEndpointWorker.transacted) ? Session.SESSION_TRANSACTED : activationSpec.getAcknowledgeModeForSession();
        final ActiveMQSession session = (ActiveMQSession)activeMQAsfEndpointWorker.getConnection().createSession(activeMQAsfEndpointWorker.transacted, acknowledge);
        MessageEndpoint endpoint;
        try {
            int batchSize = 0;
            if (activationSpec.getEnableBatchBooleanValue()) {
                batchSize = activationSpec.getMaxMessagesPerBatchIntValue();
            }
            if (activationSpec.isUseRAManagedTransactionEnabled()) {
                // The RA will manage the transaction commit.
                endpoint = createEndpoint(null);
                return new ServerSessionImpl(this, (ActiveMQSession)session, activeMQAsfEndpointWorker.workManager, endpoint, true, batchSize);
            } else {
                // Give the container an object to manage to transaction with.
                endpoint = createEndpoint(new LocalAndXATransaction(session.getTransactionContext()));
                return new ServerSessionImpl(this, (ActiveMQSession)session, activeMQAsfEndpointWorker.workManager, endpoint, false, batchSize);
            }
        } catch (UnavailableException e) {
            // The container could be limiting us on the number of endpoints
            // that are being created.
            if (LOG.isDebugEnabled()) {
                LOG.debug("Could not create an endpoint.", e);
            }
            session.close();
            return null;
        }
    }

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            activeSessions.remove(ss);
        } finally {
            sessionLock.unlock();
        }
        try {
            ActiveMQSession session = (ActiveMQSession)ss.getSession();
            List l = session.getUnconsumedMessages();
            for (Iterator i = l.iterator(); i.hasNext();) {
                dispatchToSession((MessageDispatch)i.next());
            }
        } catch (Throwable t) {
            LOG.error("Error redispatching unconsumed messages from stale session", t);

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    private void dispatchToSession(MessageDispatch messageDispatch)
            throws JMSException {


        ServerSession serverSession = getServerSession();
        Session s = serverSession.getSession();
        ActiveMQSession session = null;
        if (s instanceof ActiveMQSession) {
            session = (ActiveMQSession) s;
        } else if (s instanceof ActiveMQQueueSession) {
            session = (ActiveMQSession) s;
        } else if (s instanceof ActiveMQTopicSession) {
            session = (ActiveMQSession) s;
        } else {
            activeMQAsfEndpointWorker.getConnection()
                    .onAsyncException(new JMSException(
                            "Session pool provided an invalid session type: "
                                    + s.getClass()));
        }
        session.dispatch(messageDispatch);
        serverSession.start();
    }

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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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    }


    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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