jmsserverconnectionmanager.java

一个java方面的消息订阅发送的源码

/**
 * Redistribution and use of this software and associated documentation
 * ("Software"), with or without modification, are permitted provided
 * that the following conditions are met:
 *
 * 1. Redistributions of source code must retain copyright
 *    statements and notices.  Redistributions must also contain a
 *    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.
 *
 * 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 2000-2005 (C) Exoffice Technologies Inc. All Rights Reserved.
 *
 * $Id: JmsServerConnectionManager.java,v 1.3 2005/05/24 13:09:09 tanderson Exp $
 */
package org.exolab.jms.server;

import java.util.HashMap;
import java.util.HashSet;
import javax.jms.InvalidClientIDException;
import javax.jms.JMSException;
import javax.jms.JMSSecurityException;

import org.exolab.jms.authentication.AuthenticationMgr;


/**
 * The <code>JmsServerConnectionManager</code> is responsible for managing all
 * connections to the server.
 *
 * @author <a href="mailto:[e-mail]">Jim Alateras</a>
 * @author <a href="mailto:[e-mail]">Tim Anderson</a>
 * @version $Revision: 1.3 $ $Date: 2005/05/24 13:09:09 $
 * @see JmsServerConnection
 */
public class JmsServerConnectionManager implements ServerConnectionFactory {

    /**
     * The set of active connections.
     */
    private HashMap _connections = new HashMap();

    /**
     * The set of client identifiers.
     */
    private HashSet _clientIDs = new HashSet();

    /**
     * Seed for connection identifiers.
     */
    private long _seed = 0;

    /**
     * Holds the singleton instance of the class.
     */
    private static JmsServerConnectionManager _instance =
            new JmsServerConnectionManager();

    /**
     * Construct a new <code>JmsServerConnectionManager</code>.
     */
    private JmsServerConnectionManager() {
    }

    /**
     * Returns the singleton instance of this class.
     *
     * @return the singleton instance
     */
    public static JmsServerConnectionManager instance() {
        return _instance;
    }

    /**
     * Creates a connection with the specified user identity.
     * <p/>
     * The connection is created in stopped mode. No messages will be delivered
     * until the <code>Connection.start</code> method is explicitly called.
     * <p/>
     * If <code>clientID</code> is specified, it indicates the pre-configured
     * client identifier associated with the client <code>ConnectionFactory</code>
     * object.
     *
     * @param clientID the pre-configured client identifier. May be
     *                 <code>null</code> <code>null</code>.
     * @param userName the caller's user name
     * @param password the caller's password
     * @return a newly created connection
     * @throws InvalidClientIDException if the JMS client specifies an invalid
     *                                  or duplicate client ID.
     * @throws JMSException             if the JMS provider fails to create the
     *                                  connection due to some internal error.
     * @throws JMSSecurityException     if client authentication fails due to an
     *                                  invalid user name or password.
     */
    public ServerConnection createConnection(String clientID, String userName,
                                             String password)
            throws JMSException {
        if (!AuthenticationMgr.instance().validateUser(userName, password)) {
            throw new JMSSecurityException("Failed to authenticate user " +
                                           userName);
        }

        JmsServerConnection result = null;
        synchronized (_connections) {
            addClientID(clientID);
            long connectionId = ++_seed;
            result = new JmsServerConnection(this, connectionId, clientID);
            _connections.put(new Long(connectionId), result);
        }

        return result;
    }

    /**
     * Returns the connection associated with a particular connection
     * identifier.
     *
     * @param connectionId the connection identifier
     * @return the connection associated with <code>connectionId</code>, or
     *         <code>null</code> if none exists
     */
    public JmsServerConnection getConnection(long connectionId) {
        JmsServerConnection result = null;
        synchronized (_connections) {
            Long key = new Long(connectionId);
            result = (JmsServerConnection) _connections.get(key);
        }
        return result;
    }

    /**
     * Notify closure of a connection.
     *
     * @param connection the connection that has been closed
     */
    public void closed(JmsServerConnection connection) {
        synchronized (_connections) {
            Long key = new Long(connection.getConnectionId());
            _connections.remove(key);
            _clientIDs.remove(connection.getClientID());
        }
    }

    /**
     * Register a client identifer.
     *
     * @param clientID the client identifier. If <code>null</code, it is
     * ignored.
     * @throws InvalidClientIDException if the identifier is a duplicate.
     */
    public void addClientID(String clientID) throws InvalidClientIDException {
        synchronized (_connections) {
            if (clientID != null) {
                if (!_clientIDs.add(clientID)) {
                    throw new InvalidClientIDException(
                            "Duplicate clientID: " + clientID);
                }
            }
        }
    }

}