<?php
/**
 * XCache XCache Caching Class
 *
 * @package		XCache
 * @subpackage	Libraries
 * @category	Xcache
 * @author		XPerez
 * @link
 */

class XCache_xcache extends XCache {

	private $_instance;
	
	public function __construct() {
	}
	/**
	 * Get
	 *
	 * Since this is the dummy class, it's always going to return FALSE.
	 *
	 * @param 	string
	 * @return 	Boolean		FALSE
	 */
	public function readCache($type,$name,$ID,$onlyCheck=FALSE)
	{
		$this->getInstance();
        $originalID = $ID;

		if (isset($_POST) && count($_POST)>0)
			$ID = $ID.md5(serialize($_POST));

		self::logMessage('debug', "Reading APC $type - $name - $ID.");

		$item_expiration = $this->getCacheItemExpiration($type,$name,$originalID);

		if (is_array($item_expiration))
		{
			$item_properties = $item_expiration;
			$name .= '-'.$item_properties[0];
			$item_expiration = $item_properties[1];
		}

		if ($item_expiration == FALSE)
		{
			$item_expiration = $this->getCacheConfigItem('default',$type);
			if ($item_expiration == FALSE)
				return FALSE;
		}

		$cache=xcache_get($type.'-'.$name.'-'.$ID);

		if ($cache == FALSE) 
			return FALSE;
		
		if (function_exists('profiler_log')) profiler_log('CACHE','APC Read OK: '.$type.'/'.$name.'/'.$ID);
		
		if ($cache && $onlyCheck)
				return TRUE;

		return unserialize($cache);

	}

	// ------------------------------------------------------------------------

	/**
	 * Cache Save
	 *
	 * @param 	string		Unique Key
	 * @param 	mixed		Data to store
	 * @param 	int			Length of time (in seconds) to cache the data
	 *
	 * @return 	boolean		TRUE, Simulating success
	 */
	public function writeCache($type,$name,$ID,$output,$depID="")
	{
        $originalID = $ID;

		//if (function_exists('profiler_log')) profiler_log('CACHE','Memcache Write init : '.$type.'/'.$name.'/'.$ID);

		$item_expiration = $this->getCacheItemExpiration($type,$name,$originalID);
		
		if (is_array($item_expiration))
		{
			$item_properties = $item_expiration;
			$name .= '-'.$item_properties[0];
			$item_expiration = $item_properties[1];
		}

		if ($item_expiration == FALSE)
		{
			$item_expiration = $this->getCacheConfigItem('default',$type);
			if ($item_expiration == FALSE)
				return FALSE;
		}

		xcache_set($type.'-'.$name.'-'.$ID, serialize($output), $item_expiration);

		if (function_exists('profiler_log')) profiler_log('CACHE','APC Write OK: '.$type.'/'.$name.'/'.$ID);

		return TRUE;
	}

	// ------------------------------------------------------------------------

	/**
	 * Delete from Cache
	 *
	 * @param 	mixed		unique identifier of the item in the cache
	 * @param 	boolean		TRUE, simulating success
	 */
	public function deleteCache($type,$name,$ID)
	{
    	$originalID = $ID;
    	
    	if (isset($_POST) && count($_POST)>0)
    		$ID = $ID.md5(serialize($_POST));
		
		return xcache_unset($type.'-'.$name.'-'.$ID);
		
	}

	// ------------------------------------------------------------------------

	/**
	 * Clean the cache
	 *
	 * @return 	boolean		TRUE, simulating success
	 */
	public function cleanCache()
	{
		return xcache_clear_cache();
	}

	// ------------------------------------------------------------------------

	/**
	 * Cache Info
	 *
	 * @param 	string		user/filehits
	 * @return 	boolean		FALSE
	 */
	 public function getCacheInfo($type = NULL)
	 {
		 return FALSE;
	 }

	// ------------------------------------------------------------------------

	/**
	 * Get Cache Metadata
	 *
	 * @param 	mixed		key to get cache metadata on
	 * @return 	boolean		FALSE
	 */
	public function getCacheMetadata($id)
	{
		return FALSE;
	}

	// ------------------------------------------------------------------------

	/**
	 * Is this caching driver supported on the system?
	 * Of course this one is.
	 *
	 * @return TRUE;
	 */
	public function isSupported()
	{
		if ( ! extension_loaded('xcache') OR ini_get('xcache.size') == "0")
		{
			self::logMessage('error', 'The XCACHE PHP extension must be loaded to use XCache Cache.');
			return FALSE;
		}
		
		return TRUE;
	}

	// ------------------------------------------------------------------------

	/**
	 * getInstance
	 * 
	 */
	private function getInstance()
	{ 
		return $this;
	}
}
// End Class

/* End of file Cache_memcache.php */
/* Location: ./system/libraries/Cache/drivers/Cache_dummy.php */