perstdriver.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.perst;

import org.polepos.framework.*;
import org.polepos.teams.db4o.Db4oCar;

import org.garret.perst.*;
import java.util.Iterator;

/**
 * @author Knizhnik
 */
public abstract class PerstDriver extends Driver {
    protected Storage db;
    
    protected abstract void initialize();

	public void takeSeatIn( Car car , TurnSetup setup) throws CarMotorFailureException{
        super.takeSeatIn(car, setup);
		((PerstCar)car).initialize();
	}

	public void prepare() 
    {
        db = ((PerstCar)car()).createStorage();		
        initialize();
    }
	
    public void backToPit() 
    {
        db.close();
    }
	
    protected  <T extends CheckSummable> void iterate(Iterator<T> iterator)
    {
        while (iterator.hasNext()) {
            addToCheckSum(iterator.next().checkSum());
        }
    }
    
    protected void commit()
    {
        db.commit();
    }
  }