/**
* 静态工厂方法，获取相应的LOG接口类
* @param string $log_type
* @author Terry<*****@*****.**>
* @date 2013-08-29
* @return object
*/
public static function factory($logType)
{
$className = isset(self::$logClass[$logType]) ? self::$logClass[$logType] : '';
if (!class_exists($className)) {
throw new IException('the Log Class is not exists', 403);
}
if (!self::$log instanceof ILogs) {
self::$log = new $className();
}
return self::$log;
}