/** Returns a reference to the current fastDS object, or false
*
* @return mixed either a fastDS instance or false
**/
public static function instance()
{
if (self::$building) {
return false;
}
if (isset(self::$fastInstance)) {
return self::$fastInstance;
}
//If we already know we aren't set, return false
if (isset(self::$enabled) and !self::$enabled) {
return false;
}
$config = vB::getConfig();
if (!isset($config['fastDS']) or !$config['fastDS']) {
self::$enabled = false;
return false;
}
if (isset($config['fastDSType'])) {
$class = 'vB_FastDS_' . $config['fastDSType'];
} else {
if (!is_callable('apc_fetch')) {
return false;
}
$class = 'vB_FastDS_APC';
}
//Note that if there is a problem with cached data, on instantiotion the cache
// object with set enabled to false.
self::$enabled = true;
self::$fastInstance = new $class($config);
return self::$fastInstance;
}
