23 {

    24 	public static function factory($backend = 'auto')

    25 	{

    26 		if ( function_exists('xcache_set') )

    27 			return new CacheManager_XCache();

    28 		else

    29 			return new CacheManager_File();

    30 	}

    31 }

    32 

    33 class CacheManager_XCache

    34 {

    35 	private $prefix;

    36 	

    37 	/**

    38 	 * Constructor. Merely generates the prefix that will be prepended to cache objects.

    39 	 */

    40 	

    41 	public function __construct()

    42 	{

    43 		global $crypto_key;

    44 		$this->prefix = 'enano' . substr(md5($crypto_key), 0, 8) . '_';

    45 	}

    46 	

    47 	/**

    48 	 * @see CacheManager_File::fetch()

    49 	 */

    50 	

    51 	public function fetch($cache_id)

    52 	{

    53 		return xcache_isset($this->prefix . $cache_id) ? xcache_get($this->prefix . $cache_id) : false;

    54 	}

    55 	

    56 	/**

    57 	 * @see CacheManager_File::store()

    58 	 */

    59 	

    60 	public function store($cache_id, $data, $ttl = 20)

    61 	{

    62 		return xcache_set($this->prefix . $cache_id, $data, $ttl * 60);

    63 	}

    64 	

    65 	/**

    66 	 * @see CacheManager_File::purge()

    67 	 */

    68 	

    69 	public function purge($cache_id)

    70 	{

    71 		return xcache_unset($this->prefix . $cache_id);

    72 	}

    73 }

    74 

    75 class CacheManager_File