edu.lternet.pasta.dml.database.pooling.DatabaseConnectionPoolFactory.java Source code

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Here is the source code for edu.lternet.pasta.dml.database.pooling.DatabaseConnectionPoolFactory.java

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/**
 *    '$RCSfile: DatabaseConnectionPoolFactory.java,v $'
 *
 *     '$Author: leinfelder $'
 *       '$Date: 2007-10-05 21:10:17 $'
 *   '$Revision: 1.1 $'
 *
 *  For Details: http://kepler.ecoinformatics.org
 *
 * Copyright (c) 2003 The Regents of the University of California.
 * All rights reserved.
 * 
 * Permission is hereby granted, without written agreement and without
 * license or royalty fees, to use, copy, modify, and distribute this
 * software and its documentation for any purpose, provided that the
 * above copyright notice and the following two paragraphs appear in
 * all copies of this software.
 * 
 * IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY
 * FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
 * IF THE UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY
 * OF SUCH DAMAGE.
 * 
 * THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE
 * PROVIDED HEREUNDER IS ON AN "AS IS" BASIS, AND THE UNIVERSITY
 * OF CALIFORNIA HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT,
 * UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
 */
package edu.lternet.pasta.dml.database.pooling;

import java.sql.Connection;
import java.sql.SQLException;
import java.util.ResourceBundle;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import edu.lternet.pasta.dml.database.ConnectionNotAvailableException;
import edu.lternet.pasta.dml.database.DatabaseConnectionPoolInterface;

/**
 * This class provides an implementation of DataConnetionPoolInterface 
 * Implementation and database information for this class will be read from property file.
 * 
 * @author leinfelder
 * 
 */
public class DatabaseConnectionPoolFactory {

    public static Log log = LogFactory.getLog(DatabaseConnectionPoolFactory.class);

    /* Configuration directory and file name for the properties file */
    private static final String CONFIG_NAME = "datapackagemanager";

    private static ResourceBundle options = null;
    private static String implementationClass = null;

    static {
        loadOptions();
    }

    /**
     * Constructor. Loading database parameter from property file
     * 
     */
    public DatabaseConnectionPoolFactory() {
    }

    /**
     * Loads Data Manager options from a configuration file.
     */
    private static void loadOptions() {

        try {
            options = ResourceBundle.getBundle(CONFIG_NAME);
            implementationClass = options.getString("dbImplementationClass");
        } catch (Exception e) {
            System.out.println("Error in loading options: " + e.getMessage());
        }
    }

    public static DatabaseConnectionPoolInterface getDatabaseConnectionPoolInterface() {
        DatabaseConnectionPoolInterface instance = null;
        try {
            instance = (DatabaseConnectionPoolInterface) Class.forName(implementationClass).newInstance();
        } catch (Exception e) {
            log.error(e.getMessage() + ": could not create DatabaseConnectionPoolInterface implementation: "
                    + implementationClass);
            e.printStackTrace();
        }

        return instance;

    }

    public static void main(String arg[]) {
        Connection conn = null;
        try {
            conn = DatabaseConnectionPoolFactory.getDatabaseConnectionPoolInterface().getConnection();
            log.debug("conn=" + conn);

        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (ConnectionNotAvailableException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } finally {
            try {
                conn.close();
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }
}