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<?php
/**
* Cache calling class.
*
* Zed. The immensity of stars. The HyperShip. The people.
*
* (c) 2010, Dereckson, some rights reserved.
* Released under BSD license.
*
* This file provides a calling class, which read the configuration, ensures
* the cache class for the cache engine given in config exists and initializes
* it.
*
* You'll find a sample of implementation in the CacheMemcached.
* @see CacheMemcached
*
* If no caching mechanism, a "blackhole" void cache will be used.
* @see CacheVoid.
*
* The class to call is determined from the following preference:
* <code>
* $Config['cache']['engine'] = 'memcached'; //will use CacheMemcached class.
* </code>
*
* 0.1 2010-07-06 22:45 Initial version [DcK]
*
* @package Zed
* @subpackage Cache
* @author Sébastien Santoro aka Dereckson <dereckson@espace-win.org>
* @copyright 2010 Sébastien Santoro aka Dereckson
* @license http://www.opensource.org/licenses/bsd-license.php BSD
* @version 0.1
* @link http://scherzo.dereckson.be/doc/zed
* @link http://zed.dereckson.be/
* @filesource
*/
/**
* Cache caller
*/
class Cache {
/**
* Gets the cache instance, initializing it if needed
*
* The correct cache instance to initialize will be determined from the
* $Config['cache']['engine'] preference.
*
* The class cache to use will be Cache + (preference engine, capitalized)
*
* This method will creates an instance of the specified object,
* calling the load static method from this object class.
*
* Example:
* <code>
* $Config['cache']['engine'] = 'quux';
* $cache = Cache::load(); //Cache:load() will call CacheQuux:load();
* </code>
*
* @return Cache the cache instance, or null if nothing is cached
*/
static function load () {
global $Config;
if (
!array_key_exists('cache', $Config) ||
!array_key_exists('engine', $Config['cache'])
) {
//cache is not configured or engine is not specified
$engine = 'void';
} else {
//engine is specified in the configuration
$engine = $Config['cache']['engine'];
}
$engine_file = 'includes/cache/' . $engine . '.php';
$engine_class = 'Cache' . ucfirst($engine);
if (!file_exists($engine_file)) {
message_die(GENERAL_ERROR, "Can't initialize $engine cache engine.<br />$engine_file not found.", 'Cache');
}
require_once($engine_file);
if (!class_exists($engine_class)) {
message_die(GENERAL_ERROR, "Can't initialize $engine cache engine.<br />$engine_class class not found.", 'Cache');
}
return call_user_func(array($engine_class, 'load'));
}
}
?>

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