/*
* Copyright (c) 1998-2011 Caucho Technology -- all rights reserved
*
* This file is part of Resin(R) Open Source
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Resin Open Source 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.
*
* Resin Open Source 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, or any warranty
* of NON-INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Resin Open Source; if not, write to the
*
* Free Software Foundation, Inc.
* 59 Temple Place, Suite 330
* Boston, MA 02111-1307 USA
*
* @author Scott Ferguson
*/
package com.caucho.amber.entity;
import com.caucho.amber.manager.AmberConnection;
import com.caucho.util.Alarm;
import java.sql.SQLException;
import java.util.Map;
/**
* An entity item handles the living entities.
*/
public class CacheableEntityItem extends EntityItem {
private AmberEntityHome _home;
private Entity _cacheEntity;
private long _expireTime;
public CacheableEntityItem(AmberEntityHome home, Entity cacheEntity)
{
_home = home;
_cacheEntity = cacheEntity;
// jpa/0w00
cacheEntity.__caucho_setConnection(null);
if (cacheEntity.__caucho_isLoaded())
_expireTime = Alarm.getCurrentTime() + _home.getCacheTimeout();
}
/**
* Returns the entity home.
*/
@Override
public AmberEntityHome getEntityHome()
{
return _home;
}
/**
* Returns the cached entity.
*
* @return true if the cached value is valid.
*/
public Entity getEntity()
{
long now = Alarm.getCurrentTime();
if (_expireTime < now) {
long timeout = _home.getCacheTimeout();
boolean isExpired = _expireTime > 0 && timeout > 0;
_expireTime = now + timeout;
if (isExpired)
_cacheEntity.__caucho_expire();
}
return _cacheEntity;
}
/**
* Returns the cached entity.
*
* @return true if the cached value is valid.
*/
@Override
public Entity loadEntity(int loadGroup)
{
long now = Alarm.getCurrentTime();
if (_expireTime < now) {
_expireTime = now + _home.getCacheTimeout();
_cacheEntity.__caucho_expire();
}
AmberConnection aConn = _home.getManager().getCacheConnection();
try {
// _cacheEntity.__caucho_setConnection(aConn);
_cacheEntity.__caucho_retrieve_self(aConn);
} finally {
aConn.freeConnection();
}
return _cacheEntity;
}
/**
* Returns the cached entity.
*
* @return true if the cached value is valid.
*/
@Override
public Entity loadEntity(AmberConnection aConn,
int loadGroup)
{
long now = Alarm.getCurrentTime();
if (_expireTime < now) {
_expireTime = now + _home.getCacheTimeout();
_cacheEntity.__caucho_expire();
}
try {
// jpa/0v33
// Prepared statements are cached per context so
// at this point, the cache item needs to use the
// context connection.
// _cacheEntity.__caucho_setConnection(aConn);
_cacheEntity.__caucho_retrieve_self(aConn);
} finally {
// After loading the entity, all prepared statements
// were properly cached into the context connection.
// Now make the cached entity item independent
// from any particular context.
_cacheEntity.__caucho_setConnection(null);
}
return _cacheEntity;
}
/**
* Creates a new entity instance.
*/
@Override
public Entity createEntity(AmberConnection aConn, Object key)
throws SQLException
{
Entity cacheEntity = getEntity();
AmberEntityHome home = getEntityHome();
return cacheEntity.__caucho_home_new(home, key, aConn, this);
}
/**
* Saves the item values into the cache.
*/
public void save(Entity item)
{
/*
long now = Alarm.getCurrentTime();
synchronized (_cacheEntity) {
_expireTime = now + _home.getCacheTimeout();
_cacheEntity.__caucho_loadFromObject(item);
}
*/
}
/**
* Saves the item values into the cache.
*/
public void savePart(Entity item)
{
/*
synchronized (_cacheEntity) {
_cacheEntity.__caucho_loadFromObject(item);
}
*/
}
/**
* Expire the value from the cache.
*/
@Override
public void expire()
{
_cacheEntity.__caucho_expire();
}
Class getInstanceClass()
{
return _cacheEntity.getClass();
}
public String toString()
{
return "CacheableEntityItem[" + _cacheEntity + "]";
}
}