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<?php
/**
* TSqlMapCache class file contains FIFO, LRU, and GLOBAL cache implementations.
*
* @author Wei Zhuo <weizhuo[at]gmail[dot]com>
* @link http://www.pradosoft.com/
* @copyright Copyright © 2005-2008 PradoSoft
* @license http://www.pradosoft.com/license/
* @version $Id$
* @package System.Data.SqlMap
*/
/**
* Allow different implementation of caching strategy. See <tt>TSqlMapFifoCache</tt>
* for a first-in-first-out implementation. See <tt>TSqlMapLruCache</tt> for
* a least-recently-used cache implementation.
*
* @author Wei Zhuo <weizhuo[at]gmail[dot]com>
* @version $Id$
* @package System.Data.SqlMap
* @since 3.1
*/
abstract class TSqlMapCache implements ICache
{
protected $_keyList;
protected $_cache;
protected $_cacheSize = 100;
/**
* Create a new cache with limited cache size.
* @param integer maxium number of items to cache.
*/
public function __construct($cacheSize=100)
{
$this->_cache = new TMap;
$this->_cacheSize = intval($cacheSize);
$this->_keyList = new TList;
}
/**
* Maximum number of items to cache. Default size is 100.
* @param int cache size.
*/
public function setCacheSize($value)
{
$this->_cacheSize=TPropertyValue::ensureInteger($value,100);
}
/**
* @return int cache size.
*/
public function getCacheSize()
{
return $this->_cacheSize;
}
/**
* @return object the object removed if exists, null otherwise.
*/
public function delete($key)
{
$object = $this->get($key);
$this->_cache->remove($key);
$this->_keyList->remove($key);
return $object;
}
/**
* Clears the cache.
*/
public function flush()
{
$this->_keyList->clear();
$this->_cache->clear();
}
/**
* @throws TSqlMapException not implemented.
*/
public function add($id,$value,$expire=0,$dependency=null)
{
throw new TSqlMapException('sqlmap_use_set_to_store_cache');
}
}
/**
* First-in-First-out cache implementation, removes
* object that was first added when the cache is full.
*
* @author Wei Zhuo <weizhuo[at]gmail[dot]com>
* @version $Id$
* @package System.Data.SqlMap
* @since 3.1
*/
class TSqlMapFifoCache extends TSqlMapCache
{
/**
* @return mixed Gets a cached object with the specified key.
*/
public function get($key)
{
return $this->_cache->itemAt($key);
}
/**
* Stores a value identified by a key into cache.
* The expire and dependency parameters are ignored.
* @param string cache key
* @param mixed value to cache.
*/
public function set($key, $value,$expire=0,$dependency=null)
{
$this->_cache->add($key, $value);
$this->_keyList->add($key);
if($this->_keyList->getCount() > $this->_cacheSize)
{
$oldestKey = $this->_keyList->removeAt(0);
$this->_cache->remove($oldestKey);
}
}
}
/**
* Least recently used cache implementation, removes
* object that was accessed last when the cache is full.
*
* @author Wei Zhuo <weizhuo[at]gmail[dot]com>
* @version $Id$
* @package System.Data.SqlMap
* @since 3.1
*/
class TSqlMapLruCache extends TSqlMapCache
{
/**
* @return mixed Gets a cached object with the specified key.
*/
public function get($key)
{
if($this->_keyList->contains($key))
{
$this->_keyList->remove($key);
$this->_keyList->add($key);
return $this->_cache->itemAt($key);
}
}
/**
* Stores a value identified by a key into cache.
* The expire and dependency parameters are ignored.
* @param string the key identifying the value to be cached
* @param mixed the value to be cached
*/
public function set($key, $value,$expire=0,$dependency=null)
{
$this->_cache->add($key, $value);
$this->_keyList->add($key);
if($this->_keyList->getCount() > $this->_cacheSize)
{
$oldestKey = $this->_keyList->removeAt(0);
$this->_cache->remove($oldestKey);
}
}
}
/**
* TSqlMapApplicationCache uses the default Prado application cache for
* caching SqlMap results.
*
* @author Wei Zhuo <weizho[at]gmail[dot]com>
* @version $Id$
* @package System.Data.SqlMap
* @since 3.1
*/
class TSqlMapApplicationCache implements ICache
{
/**
* @param string item to be deleted.
*/
public function delete($key)
{
$this->getCache()->delete($key);
}
/**
* Deletes all items in the cache.
*/
public function flush()
{
$this->getCache()->flush();
}
/**
* @return mixed Gets a cached object with the specified key.
*/
public function get($key)
{
$result = $this->getCache()->get($key);
return $result === false ? null : $result;
}
/**
* Stores a value identified by a key into cache.
* @param string the key identifying the value to be cached
* @param mixed the value to be cached
*/
public function set($key, $value,$expire=0,$dependency=null)
{
$this->getCache()->set($key, $value, $expire,$dependency);
}
/**
* @return ICache Application cache instance.
*/
protected function getCache()
{
return Prado::getApplication()->getCache();
}
/**
* @throws TSqlMapException not implemented.
*/
public function add($id,$value,$expire=0,$dependency=null)
{
throw new TSqlMapException('sqlmap_use_set_to_store_cache');
}
}
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