/**
  * 加载模块列表缓存
  */
 private function _loadCacheModules()
 {
     $dalDir = defined('DAL_DIR') ? DAL_DIR : dirname(__FILE__);
     self::$cacheModulesListFile = $dalDir . '/modules.lst';
     if (file_exists(self::$cacheModulesListFile)) {
         $this->cacheModules = unserialize(file_get_contents(self::$cacheModulesListFile));
     } else {
         $this->cacheModules = array();
         //throw new ZOL_Exception('Cache Modules List File "' . self::$cacheModulesListFile . '" does not exist!');
     }
 }
 public function __construct()
 {
     self::$moduleManager = ZOL_DAL_CacheModuleManager::getInstance();
 }