static public function getGlobalPrefix()
    {
        if(!isset(self::$globalPrefix)) {
            // backwards compatibility
            global $container;
            if (self::BACKWORDS_COMPATIBLE) {
                if (isset($container) && isset($container['memcachePrefix'])) {
                    self::$globalPrefix = $container['memcachePrefix'];
                } else {
                    self::$globalPrefix = "DefaultPrefix";
                }
            } else {
                trigger_error("Before using NoizuLabs/Fragmented you must set a global prefix using NoizuLabs\FragmentedKeys\Configuration::setGlobalPrefix(String \$prefix)", E_USER_WARNING);
            }
        }
        return self::$globalPrefix;
    }