org.snipsnap.util.ConnectionManager.java Source code

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Here is the source code for org.snipsnap.util.ConnectionManager.java

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/*
 * This file is part of "SnipSnap Wiki/Weblog".
 *
 * Copyright (c) 2002 Stephan J. Schmidt, Matthias L. Jugel
 * All Rights Reserved.
 *
 * Please visit http://snipsnap.org/ for updates and contact.
 *
 * --LICENSE NOTICE--
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 * --LICENSE NOTICE--
 */
package org.snipsnap.util;

import org.apache.commons.dbcp.ConnectionFactory;
import org.apache.commons.dbcp.DriverManagerConnectionFactory;
import org.apache.commons.dbcp.PoolableConnectionFactory;
import org.apache.commons.dbcp.PoolingDataSource;
import org.apache.commons.pool.ObjectPool;
import org.apache.commons.pool.impl.GenericObjectPool;
import org.radeox.util.logging.Logger;
import org.snipsnap.app.Application;
import org.snipsnap.config.Configuration;

import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

/**
 * The connection manager handles all database connections.
 *
 * @author Stephan J. Schmidt, Matthias L. Jugel
 * @version $Id: ConnectionManager.java 1712 2004-07-14 11:20:59Z leo $
 */
public class ConnectionManager {
    private static ConnectionManager instance;

    public static ConnectionManager getInstance() {
        if (null == instance) {
            instance = new ConnectionManager();
        }
        return instance;
    }

    public static synchronized void removeInstance() {
        if (null != instance) {
            instance = null;
        }
    }

    private DataSource dataSource = null;

    private ConnectionManager() {
    }

    private void update(Configuration config) {
        if (null == dataSource) {
            try {
                System.err.println("ConnectionManager: Registering JDBC driver: " + config.getJdbcDriver());
                Class.forName(config.getJdbcDriver());
            } catch (Exception e) {
                Logger.fatal("unable to register JDBC driver: " + config.getJdbcDriver(), e);
            }

            String jdbcUrl = config.getJdbcUrl();
            //      if (jdbcUrl.indexOf("?") != -1) {
            //        jdbcUrl = jdbcUrl.concat("&");
            //      } else {
            //        jdbcUrl = jdbcUrl.concat("?");
            //      }
            String jdbcPassword = config.getJdbcPassword();
            //      if (null == jdbcPassword) {
            //        jdbcPassword = "";
            //      }
            //      jdbcUrl = jdbcUrl.concat("user=" + config.getJdbcUser()).concat("&password=" + jdbcPassword);
            //      System.err.println("ConnectionManager: using: "+ jdbcUrl);
            ObjectPool connectionPool = new GenericObjectPool(null);
            ConnectionFactory connectionFactory = new DriverManagerConnectionFactory(jdbcUrl, config.getJdbcUser(),
                    jdbcPassword);
            PoolableConnectionFactory poolableConnectionFactory = new PoolableConnectionFactory(connectionFactory,
                    connectionPool, null, null, false, true);
            dataSource = new PoolingDataSource(connectionPool);
        }
    }

    private Connection connection() {
        update(Application.get().getConfiguration());

        try {
            return dataSource.getConnection();
        } catch (Exception e) {
            Logger.fatal("unable to get connection: ", e);
            return null;
        }
    }

    private DataSource dataSource() {
        update(Application.get().getConfiguration());

        return dataSource;
    }

    public static DataSource getDataSource() {
        return getInstance().dataSource();
    }

    public static Connection getConnection() {
        return getInstance().connection();
    }

    public static void close(Connection conn) {
        if (null != conn) {
            try {
                conn.close();
            } catch (SQLException e) {
                // We can't do anything
            }
        }
    }

    public static void close(Statement statement) {
        if (null != statement) {
            try {
                statement.close();
            } catch (SQLException e) {
                // We can't do anything
            }
        }
    }

    public static void close(ResultSet result) {
        if (null != result) {
            try {
                result.close();
            } catch (SQLException e) {
                // We can't do anything
            }
        }
    }
}