/**
* Returns singleton instance of self.
* @todo This can be inherited once late static binding is available. For now
* it has to be redefined in the child classes
*
* @return vB_Cache_Db - Reference to singleton instance of cache handler
*/
public static function instance()
{
if (!isset(self::$instance)) {
$class = __CLASS__;
self::$instance = new $class();
}
return self::$instance;
}
/**
* Returns an instance of the global cache.
* The cache type used is defined in options.
*
* @return vB_Cache - Reference to instance of the cache handler
*/
public static function instance()
{
if (!isset(self::$instance)) {
// TODO: Use config to determine the cache types to use
self::$instance = vB_Cache_Db::instance();
// TODO: Get appropriate class from options
self::$instance->attachObserver(vB_Cache_Observer_Db::instance(self::$instance));
vB::$vbulletin->shutdown->add(array(self::$instance, 'shutdown'));
}
if (vB::$vbulletin->debug and $_REQUEST['nocache']) {
vB::$vbulletin->options['nocache'] = 1;
}
return self::$instance;
}
