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<?php
namespace Prado\Data\SqlMap\DataMapper;
/**
* 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 © 2005-2014 PradoSoft
* @license http://www.pradosoft.com/license/
* @package Prado\Data\SqlMap\DataMapper
*/
/**
* Least recently used cache implementation, removes
* object that was accessed last when the cache is full.
*
* @author Wei Zhuo <weizhuo[at]gmail[dot]com>
* @package Prado\Data\SqlMap\DataMapper
* @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);
}
}
}
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