Gdn_Cache::activeCache PHP Method

    public static function activeCache()
    {
        /*
         * There is a catch 22 with caching the config file. We need
         * an external way to define the cache layer before needing it
         * in the config.
         */
        if (defined('CACHE_METHOD_OVERRIDE')) {
            $ActiveCache = CACHE_METHOD_OVERRIDE;
        } else {
            $ActiveCache = c('Cache.Method', false);
        }
        // This should only fire when cache is loading automatically
        if (!func_num_args() && Gdn::pluginManager() instanceof Gdn_PluginManager) {
            Gdn::pluginManager()->EventArguments['ActiveCache'] =& $ActiveCache;
            Gdn::pluginManager()->fireEvent('BeforeActiveCache');
        }
        return $ActiveCache;
    }

 /**
  * Register a temporary server connection failure.
  *
  * This method will attempt to temporarily excise the offending server from
  * the connect roster for a period of time.
  *
  * @param string $server
  */
 public function fail($server)
 {
     // Use APC?
     $apc = false;
     if (C('Garden.Apc', false) && function_exists('apc_fetch')) {
         $apc = true;
     }
     // Get the active cache name
     $activeCache = Gdn_Cache::activeCache();
     $activeCache = ucfirst($activeCache);
     $activeStoreKey = "Cache.{$activeCache}.Store";
     // Get the local store.
     $localStore = val($activeCache, Gdn_Cache::$stores, null);
     if (is_null($localStore)) {
         Gdn_Cache::activeStore();
         $localStore = val($activeCache, Gdn_Cache::$stores, null);
         if (is_null($localStore)) {
             return false;
         }
     }
     $storeServerName = md5($server);
     if (!array_key_exists($storeServerName, $localStore)) {
         return false;
     }
     $storeServer =& $localStore[$storeServerName];
     $isActive =& $storeServer['Active'];
     if (!$isActive) {
         return false;
     }
     $fails =& $storeServer['Fails'];
     $fails++;
     $active = $isActive ? 'active' : 'inactive';
     // Check if we need to deactivate for 5 minutes
     if ($isActive && $storeServer['Fails'] > 3) {
         $isActive = false;
         $storeServer['Delay'] = time() + Gdn_Cache::CACHE_EJECT_DURATION;
     }
     // Save
     Gdn_Cache::$stores[$activeCache] = $localStore;
     // Save to APC
     if ($apc) {
         apc_store($activeStoreKey, $localStore, Gdn_Cache::APC_CACHE_DURATION);
     }
     return true;
 }