webapp.java

Java的面向对象数据库系统的源代码

// $Id: WebApp.java,v 1.1 2002/07/18 09:08:03 per_nyfelt Exp $


package webapp;

import org.apache.log4j.Category;
import song.SongServices;
import org.ozoneDB.*;

/**
 * Aplication singleton for the Web Application
 *
 * @version $Revision: 1.1 $ $Date: 2002/07/18 09:08:03 $
 * @author James Stiefel
 */

public class WebApp {

    private static ExternalDatabase     db = null;

    /**
     * log4j logger
     */
    private static Category logger = Category.getInstance(WebApp.class.getName());

    /**
     * Initialize the system - establish database connection, etc.
     *
     */
    public static void init()  {

        //config log4j logger : log4j.properties will automatically load
        //PropertyConfigurator.configure("log4j.properties");

        try {
            logger.info("init()");
            //TODO: configuration for the database URL might be nice

            // create and open a new database connection
            db = ExternalDatabase.openDatabase( "ozonedb:remote://localhost:3333" );

            if (db == null){
                logger.warn("init(): db == null -- something went wrong.");
            }

            logger.info( "Connected ..." );
            db.reloadClasses();

            SongServices.init(db);
        } catch (Exception e){
            logger.error("init() failed", e);
        }
    }

    /**
     * Close down the application -- disconnect from the database, etc.
     *
     */
    public static void term()  {
        //close up the database

        logger.info("term()");

        SongServices.term();

        try {
            db.close();
        } catch (Exception e){
            e.printStackTrace();
        }
        db         = null;
    }

    /**
     * Get the database instance.
     *
     */
    public static OzoneInterface    database(){
        return db;
    }


}