db4ocarlocal.java

个人感觉非常不错的poleperst-acid

/* 
This file is part of the PolePosition database benchmark
http://www.polepos.org

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., 59 Temple Place - Suite 330, Boston,
MA  02111-1307, USA. */

package org.polepos.teams.db4o;

import java.io.*;

import com.db4o.*;
import com.db4o.ext.*;

/**
 *
 * @author Herkules
 */
public class Db4oCarLocal extends Db4oCar
{
    
    private static final String FOLDER = "data/db4o";

    private static final String DB4O_FILE = "dbbench.yap"; 
    
    public Db4oCarLocal() {
		super(Db4o.version().substring(5));
		
	}

    /**
     * Initialize the database by deleting the database file.
     */
    public void initialize()
    {
        new File(FOLDER).mkdirs();
        deleteDatabaseFile();
    }
    
    /**
     * Open database in the configured mode.
     */
    public ExtObjectContainer createObjectContainer()
    {
        return Db4o.openFile( path() ).ext();
    }

    /**
     * get rid of the database file.
     */
    private void deleteDatabaseFile()
    {
        new File( path() ).delete();
    }
    
    
    private final String path(){
        return FOLDER + "/" + DB4O_FILE;
        
    }
    

}