adminconnection.java

来自「OpenJMS是一个开源的Java Message Service API 1.」· Java 代码 · 共 592 行 · 第 1/2 页

/**
 * 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.
 */
package org.exolab.jms.server;

import java.sql.Connection;
import java.util.Enumeration;
import java.util.Vector;
import javax.jms.JMSException;

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

import org.exolab.jms.authentication.AuthenticationMgr;
import org.exolab.jms.authentication.User;
import org.exolab.jms.client.JmsDestination;
import org.exolab.jms.client.JmsQueue;
import org.exolab.jms.client.JmsTopic;
import org.exolab.jms.config.Configuration;
import org.exolab.jms.config.Connector;
import org.exolab.jms.config.types.SchemeType;
import org.exolab.jms.messagemgr.ConsumerEndpoint;
import org.exolab.jms.messagemgr.ConsumerManager;
import org.exolab.jms.messagemgr.DestinationCache;
import org.exolab.jms.messagemgr.DestinationManager;
import org.exolab.jms.messagemgr.DurableConsumerEndpoint;
import org.exolab.jms.persistence.DatabaseService;
import org.exolab.jms.persistence.PersistenceException;
import org.exolab.jms.service.ServiceException;
import org.exolab.jms.service.Services;


/**
 * A connection is created for every adminclient connecting to the JmsServer.
 *
 * @author <a href="mailto:[e-mail]">Knut Lerpold</a>
 * @version $Revision: 1.7 $ $Date: 2005/12/23 12:17:45 $
 * @see org.exolab.jms.server.AdminConnectionManager
 */
public class AdminConnection {

    /**
     * The configuration.
     */
    private final Configuration _config;

    /**
     * The authentication manager.
     */
    private final AuthenticationMgr _authenticator;

    /**
     * The destination manager.
     */
    private final DestinationManager _destinations;

    /**
     * The consumer manager.
     */
    private final ConsumerManager _consumers;

    /**
     * The database service.
     */
    private final DatabaseService _database;

    /**
     * The services.
     */
    private final Services _services;

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


    /**
     * Construct a new <code>AdminConnection</code>.
     *
     * @param config        the configuration
     * @param authenticator the authentication manager
     * @param destinations  the destination manager
     * @param database      the database service
     * @param services      the services
     */
    protected AdminConnection(Configuration config, AuthenticationMgr authenticator,
                              DestinationManager destinations, ConsumerManager consumers,
                              DatabaseService database,
                              Services services) {
        if (config == null) {
            throw new IllegalArgumentException("Argument 'config' is null");
        }
        if (authenticator == null) {
            throw new IllegalArgumentException(
                    "Argument 'authenticator' is null");
        }
        if (destinations == null) {
            throw new IllegalArgumentException(
                    "Argument 'destinations' is null");
        }
        if (consumers == null) {
            throw new IllegalArgumentException("Argument 'consumers' is null");
        }
        if (database == null) {
            throw new IllegalArgumentException("Argument 'database' is null");
        }
        if (services == null) {
            throw new IllegalArgumentException("Argument 'services' is null");
        }
        _config = config;
        _authenticator = authenticator;
        _destinations = destinations;
        _consumers = consumers;
        _database = database;
        _services = services;
    }

    /**
     * Close the admin connection
     */
    public void close() {
    }

    /**
     * Return the number of messages for a durable consumer.
     *
     * @param topic name of the topic
     * @param name  consumer name
     * @return int                 number of unsent or unacked messages
     */
    public int getDurableConsumerMessageCount(String topic, String name) {
        int count = -1;
        try {
            // first see if the cache is loaded in memory
            JmsDestination dest = _destinations.getDestination(topic);
            ConsumerEndpoint endpoint = null;
            if ((dest != null)
                    && ((name != null)
                    || (name.length() > 0))) {

                endpoint = _consumers.getConsumerEndpoint(name);
                if ((endpoint != null)
                        && (endpoint.getDestination().equals(dest))) {
                    // retrieve the number of handles for the endpoint, which
                    // reflects the number of messages
                    count = endpoint.getMessageCount();
                } else {
                    // there is no cache with this name stored in memory. If
                    // this is an administered destination then read the count
                    //  directly from the database.
                    if (dest.getPersistent()) {
                        try {
                            _database.begin();
                            Connection connection = _database.getConnection();
                            count = _database.getAdapter().
                                    getDurableConsumerMessageCount(connection, topic,
                                                                   name);
                            _database.commit();
                        } catch (PersistenceException exception) {
                            _log.error(exception, exception);
                            try {
                                _database.rollback();
                            } catch (PersistenceException error) {
                                // no-op
                            }
                        }
                    }
                }
            }
        } catch (Exception exception) {
            _log.error("Failed to get message count for topic=" + topic,
                       exception);
        } finally {
        }

        return count;
    }

    /**
     * First use the destination manager to return the number of persistent and
     * non-persistent messages in a queue.
     *
     * @param queue name of the queue
     * @return int - the number of messages for that destination or -1 if the
     *         destination is invalid
     */
    public int getQueueMessageCount(String queue) {
        int count = -1;

        try {
            // first see if the cache is loaded in memory
            JmsDestination dest = _destinations.getDestination(queue);
            DestinationCache cache = null;
            if (dest != null) {
                _database.begin();
                cache = _destinations.getDestinationCache(dest);
                // retrieve the number of handles for the cache, which
                // reflects the number of messages
                count = cache.getMessageCount();
                _database.commit();
            }
        } catch (Exception exception) {
            _log.error("Failed to get message count for queue=" + queue,
                       exception);
            rollback();
        }
        return count;
    }

    /**
     * Add the specified durable consumer to the database.
     *
     * @param topic name of the destination
     * @param name  name of the consumer
     * @return boolean             true if successful
     */
    public boolean addDurableConsumer(String topic, String name) {
        boolean result = false;
        try {
            JmsTopic t = new JmsTopic(topic);
            t.setPersistent(true);
            _consumers.subscribe(t, name, null);
            result = true;
        } catch (JMSException exception) {
            _log.error("Failed to add durable consumer=" + name
                       + " for topic=" + topic, exception);
        }

        return result;
    }

    /**
     * Remove the consumer attached to the specified destination and with the
     * passed in name.
     *
     * @param name name of the consumer
     * @return boolean             true if successful
     */
    public boolean removeDurableConsumer(String name) {
        boolean result = false;
        try {
            _consumers.unsubscribe(name, null);
            result = true;
        } catch (JMSException exception) {
            _log.debug("Failed to remove durable consumer=" + name, exception);
        }

        return result;
    }

    /**
     * Check if the durable consumer exists.
     *
     * @param name name of the durable conusmer
     * @return boolean             true if it exists and false otherwise
     */