jmsqueuesession.java

实现了Jms的服务器源码,支持多种适配器,DB,FTP,支持多种数据库

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 * 4. Products derived from this Software may not be called "Exolab"
 *    nor may "Exolab" appear in their names without prior written
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 * 5. Due credit should be given to the Exolab Project
 *    (http://www.exolab.org/).
 *
 * THIS SOFTWARE IS PROVIDED BY EXOFFICE TECHNOLOGIES AND CONTRIBUTORS
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Copyright 2000-2004 (C) Exoffice Technologies Inc. All Rights Reserved.
 */
package org.exolab.jms.client;

import javax.jms.InvalidDestinationException;
import javax.jms.JMSException;
import javax.jms.Queue;
import javax.jms.QueueSession;
import javax.jms.QueueReceiver;
import javax.jms.QueueSender;
import javax.jms.QueueBrowser;
import javax.jms.TemporaryQueue;


/**
 * Client implementation of the <code>javax.jms.QueueSession</code> interface
 *
 * @version     $Revision: 1.22 $ $Date: 2004/01/20 14:14:21 $
 * @author      <a href="mailto:[e-mail]">Jim Alateras</a>
 */
class JmsQueueSession
    extends JmsSession
    implements QueueSession {

    /**
     * Construct a new <code>JmsQueueSession</code>
     *
     * @param connection the owner of the session
     * @param transacted if <code>true</code>, the session is transacted.
     * @param ackMode indicates whether the consumer or the client will
     * acknowledge any messages it receives. This parameter will be ignored if
     * the session is transacted. Legal values are
     * <code>Session.AUTO_ACKNOWLEDGE</code>,
     * <code>Session.CLIENT_ACKNOWLEDGE</code> and
     * <code>Session.DUPS_OK_ACKNOWLEDGE</code>.
     * @throws JMSException if the session cannot be created
     */
    public JmsQueueSession(JmsQueueConnection connection, boolean transacted,
                           int ackMode) throws JMSException {
        super(connection, transacted, ackMode);
    }

    /**
     * Create a queue identity given its name
     *
     * @param queueName the queue name
     * @return a queue with the given name.
     * @throws JMSException if the queue can't be created
     */
    public synchronized Queue createQueue(String queueName)
        throws JMSException {
        ensureOpen();

        JmsQueue queue = null;

        if (queueName != null && queueName.length() > 0) {
            queue = new JmsQueue(queueName);
        } else {
            throw new JMSException(
                "Cannot create a queue with null or empty name");
        }

        return queue;
    }

    /**
     * Create a receiver to receive messages from the specified queue
     *
     * @param queue the queue to access
     * @return the new receiver
     * @throws JMSException if the receiver cannot be created
     */
    public QueueReceiver createReceiver(Queue queue) throws JMSException {
        return createReceiver(queue, null);
    }

    /**
     * Create a receiver to receive messages from the specified queue
     *
     * @param queue the queue to access
     * @param selector the message selector to filter messages.
     * May be <code>null</code>
     * @return the new receiver
     * @throws JMSException if the receiver cannot be created
     */
    public synchronized QueueReceiver createReceiver(Queue queue,
                                                     String selector)
        throws JMSException {

        JmsQueueReceiver receiver = null;

        ensureOpen();

        if (queue == null) {
            throw new InvalidDestinationException(
                "Cannot create receiver: argument 'queue' is null");
        }

        // check to see if the queue is temporary. A temporary queue
        // can only be used within the context of the owning connection
        if (!checkForValidTemporaryDestination((JmsDestination) queue)) {
            throw new InvalidDestinationException(
                "Cannot create a receiver for a temp queue that is not "
                + "bound to this connection");
        }

        receiver = new JmsQueueReceiver(this, getNextConsumerId(),
                                        (JmsQueue) queue, selector);
        addReceiver(receiver);

        return receiver;
    }

    /**
     * Create a sender to send messages to the specified queue.
     *
     * @param queue the queue to access, or <code>null</code> if this is an
     * unidentified producer
     * @return the new sender
     * @throws JMSException if the sender can't be created
     */
    public synchronized QueueSender createSender(Queue queue)
        throws JMSException {
        ensureOpen();
        JmsQueueSender sender = new JmsQueueSender(this, (JmsQueue) queue);
        addSender(sender);
        return sender;
    }

    /**
     * Create a new queue browser
     *
     * @param queue the queue to access
     * @return the new queue browser
     * @throws JMSException if the browser can't be created
     */
    public QueueBrowser createBrowser(Queue queue) throws JMSException {
        return createBrowser(queue, null);
    }

    /**
     * Create a new queue browser
     *
     * @param queue the queue to access
     * @param selector the message selector to filter messages.
     * May be <code>null</code>
     * @return the new queue browser
     * @throws JMSException if the browser can't be created
     */
    public synchronized QueueBrowser createBrowser(Queue queue,
                                                   String selector)
        throws JMSException {

        ensureOpen();

        if (queue == null) {
            throw new InvalidDestinationException(
                "Cannot create browser: argument 'queue' is null");
        }

        JmsQueueBrowser browser = null;

        // check to see if the queue is temporary. A temporary queue
        // can only be used within the context of the owning connection
        if (!checkForValidTemporaryDestination((JmsDestination) queue)) {
            throw new InvalidDestinationException(
                "Cannot create a queue browser for a temp queue "
                + "that is not bound to this connection");
        }

        browser = new JmsQueueBrowser(
            this, getNextConsumerId(), (JmsQueue) queue, selector);
        addBrowser(browser);

        return browser;
    }

    /**
     * Create a temporary queue. It's lifetime is that of the QueueConnection,
     * unless deleted earlier.
     *
     * @return a new temporary queue
     * @throws JMSException if the queue cannot be created
     */
    public synchronized TemporaryQueue createTemporaryQueue()
        throws JMSException {
        ensureOpen();

        JmsTemporaryQueue queue = new JmsTemporaryQueue();
        queue.setOwningConnection(getConnection());

        return queue;
    }

    /**
     * Register a receiver
     *
     * @param receiver the receiver to register
     * @throws JMSException if the receiver cannot be registered with the
     * server
     */
    protected void addReceiver(JmsQueueReceiver receiver) throws JMSException {
        // create it on the server
        getJmsSessionStub().createReceiver(
            (JmsQueue) receiver.getQueue(), receiver.getClientId(),
             receiver.getMessageSelector());

        // register locally
        addConsumer(receiver);
    }

    /**
     * Register a sender
     *
     * @param sender the sender to register
     */
    protected void addSender(JmsQueueSender sender) {
        // getJmsSessionStub().createSender((JmsQueue)sender.getQueue());
        // -- no longer used.

        // register locally
        addProducer(sender);
    }

    /**
     * Register a browser
     *
     * @param browser the browser to register
     * @throws JMSException if the browser cannot be registered with the
     * server
     */
    protected void addBrowser(JmsQueueBrowser browser) throws JMSException {
        // create it on the server
        getJmsSessionStub().createBrowser((JmsQueue) browser.getQueue(),
            browser.getClientId(), browser.getMessageSelector());

        // register locally
        addConsumer(browser);
    }

    /**
     * Deregister a receiver
     *
     * @param receiver the receiver to deregister
     * @throws JMSException if the receiver cannot be deregistered from the
     * server
     */
    protected synchronized void removeReceiver(JmsQueueReceiver receiver)
        throws JMSException {
        // unregister the message listener. This must be called before
        // deleting the receiver for correct clean up
        if (!isClosed()) {
            removeMessageListener(receiver);
            getJmsSessionStub().deleteReceiver(receiver.getClientId());
        }

        // local clean up
        removeConsumer(receiver);
    }

    /**
     * Deregister a sender
     *
     * @param sender the sender to deregister
     */
    protected synchronized void removeSender(JmsQueueSender sender) {
        // local clean up
        removeProducer(sender);
    }

    /**
     * Deregister a queue browser
     *
     * @param browser the browser to deregister
     * @throws JMSException if the browser cannot be deregistered from the
     * server
     */
    protected synchronized void removeBrowser(JmsQueueBrowser browser)
        throws JMSException {
        // deregister from the server
        if (!isClosed()) {
            getJmsSessionStub().deleteBrowser(browser.getClientId());
        }

        // local clean up
        removeConsumer(browser);
    }
}