rmijmsserverconnection.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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 * that the following conditions are met:
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 *    copy of this document.
 *
 * 2. Redistributions in binary form must reproduce the
 *    above copyright notice, this list of conditions and the
 *    following disclaimer in the documentation and/or other
 *    materials provided with the distribution.
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 * 3. The name "Exolab" must not be used to endorse or promote
 *    products derived from this Software without prior written
 *    permission of Exoffice Technologies.  For written permission,
 *    please contact [e-mail].
 *
 * 4. Products derived from this Software may not be called "Exolab"
 *    nor may "Exolab" appear in their names without prior written
 *    permission of Exoffice Technologies. Exolab is a registered
 *    trademark of Exoffice Technologies.
 *
 * 5. Due credit should be given to the Exolab Project
 *    (http://www.exolab.org/).
 *
 * THIS SOFTWARE IS PROVIDED BY EXOFFICE TECHNOLOGIES AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
 * NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
 * EXOFFICE TECHNOLOGIES OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * 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 2000-2003 (C) Exoffice Technologies Inc. All Rights Reserved.
 *
 * $Id: RmiJmsServerConnection.java,v 1.18 2003/08/17 01:32:26 tanderson Exp $
 *
 * Date         Author  Changes
 * 04/18/2000   jima    Created
 */
package org.exolab.jms.server.rmi;

import java.rmi.RemoteException;
import java.rmi.server.UnicastRemoteObject;
import java.util.Enumeration;

import javax.jms.JMSException;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import org.exolab.jms.lease.BaseLease;
import org.exolab.jms.lease.LeaseEventListenerIfc;
import org.exolab.jms.server.JmsServerConnection;
import org.exolab.jms.server.JmsServerConnectionManager;


/**
 * This is an implementation of the RemoteJmsServerConnectionIfc interface
 * which wraps the JmsConnection class. It basically delegates to an instance
 * of JmsConnection.
 *
 * @version     $Revision: 1.18 $ $Date: 2003/08/17 01:32:26 $
 * @author      <a href="mailto:[e-mail]">Jim Alateras</a>
 * @see         JmsServerConnection
 */
public class RmiJmsServerConnection
    extends UnicastRemoteObject
    implements RemoteJmsServerConnectionIfc, LeaseEventListenerIfc {

    /**
     * This is the object that the RMI connection object delegates to. It must
     * be non-null and assigned during object construction
     */
    protected JmsServerConnection _delegate = null;

    /**
     * The interval, in milliseconds, between subsequent ping events
     */
    protected int _interval = 0;

    /**
     * This is the lease on  this object. This is not used anymore since we
     * now use a different approach to determine whether the client is
     * active. {@see JmsServerSession#isClientEndpointActive}
     */
    protected BaseLease _lease = null;

    /**
     * The logger
     */
    private static final Log _log =
        LogFactory.getLog(RmiJmsServerConnection.class);


    /**
     * Instantiae an instance of this class with a JmsServerConnection instance.
     * This class will simply delegate requests to the JmsServerConnection
     * object. If a null connection is specified then throw JMSException.
     *
     * @param connection delegate connection object
     * @param interval the interval between ping requests, in seconds
     * @throws RemoteException if failed to export object
     */
    public RmiJmsServerConnection(JmsServerConnection connection, int interval)
        throws RemoteException {

        if (connection == null) {
            throw new IllegalArgumentException("Argument connection is null");
        }

        if (interval < 0) {
            interval = 0;
        }
        _interval = interval * 1000;
        _delegate = connection;
    }

    // implementation of RemoteJmsServerConnection.createSession
    public RemoteJmsServerSessionIfc createSession(int ackMode,
                                                   boolean transacted)
        throws JMSException, RemoteException {
        return new RmiJmsServerSession(
            _delegate.createSession(ackMode, transacted));
    }

    // implementation of RemoteJmsServerConnection.deleteSession
    public void deleteSession(RemoteJmsServerSessionIfc session)
        throws JMSException, RemoteException {
        //    _delegate.deleteSession(???);
    }

    // implementation of RemoteJmsServerConnection.getSessionCount
    public int getSessionCount() throws JMSException, RemoteException {
        return _delegate.getSessionCount();
    }

    // implementation of RemoteJmsServerConnection.getSessions
    public Enumeration getSessions() throws JMSException, RemoteException {
        throw new RemoteException(
            "This function is too expensive to implement");
        // this is quite an expensive call since it will create
        // RmiJmsServerSession objects for each active session.
        // wait until we need it.
    }

    // implementation of RemoteJmsServerConnection.start
    public void start() throws JMSException, RemoteException {
        _delegate.start();
    }

    // implementation of RemoteJmsServerConnection.stop
    public void stop() throws JMSException, RemoteException {
        _delegate.stop();
    }

    // implementation of RemoteJmsServerConnection.close
    public void close() throws JMSException, RemoteException {
        JmsServerConnectionManager.instance().closeConnection(
            _delegate.getID());
        _delegate.close();
        _delegate = null;
    }

    // implementation of RemoteJmsServerConnection.getConnectionId()
    public String getConnectionId() throws RemoteException {
        return _delegate.getConnectionId();
    }

    // implementation of RemoteJmsServerConnection.ping()
    public void ping() throws RemoteException {
        // do nothing at this stage

        //if (_lease == null) {
        //    _lease = LeaseManager.instance().createLease(
        //        this, _interval, this);
        //} else {
        //    LeaseManager.instance().renewLease(_lease, _interval);
        //}
    }

    // implementation of LeaseEventListenerIfc.onLeaseExpired
    public void onLeaseExpired(Object leasedObject) {
        _log.error("onLeaseExpired should never be called");
        /**
         // the lease has expired. It means that the client has gone. so we need
         // to shutdown the connection on this side
         try {
         this.close();
         _lease = null;
         } catch (Exception exception) {
         // catch all exceptions
         _log.error("Error while closing the connection", exception);
         }
         **/
    }

} //-- RmiJmsServerConnection