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path: root/framework/Data/SqlMap/DataMapper/TSqlMapCache.php
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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 &copy; 2005-2014 PradoSoft
 * @license http://www.pradosoft.com/license/
 * @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>
 * @package System.Data.SqlMap
 * @since 3.1
 */
abstract class TSqlMapCache implements ICache
{
	protected $_keyList;
	protected $_cache;
	protected $_cacheSize = 100;
	protected $_cacheModel = null;

	/**
	 * Create a new cache with limited cache size.
	 * @param TSqlMapCacheModel $cacheModel.
	 */
	public function __construct($cacheModel=null)
	{
		$this->_cache = new TMap;
		$this->_keyList = new TList;
		$this->_cacheModel=$cacheModel;
	}

	/**
	 * 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');
	}
}