public function execute($filterChain)
 {
     // Create a function cache object for the QubitSettings method call
     $cache = new sfFileCache(array('cache_dir' => sfConfig::get('sf_app_cache_dir') . '/settings'));
     // Get settings (from cache if exists)
     if ($cache->has('settings')) {
         $settings = unserialize($cache->get('settings'));
     } else {
         $settings = QubitSetting::getSettingsArray();
         $cache->set('settings', serialize($settings));
     }
     // Overwrite/populate settings into sfConfig object
     sfConfig::add($settings);
     // Execute next filter
     $filterChain->execute();
 }