docs: public static Setting get(String name) {
  		Setting setting = settingMap.get(name);
  		if (null == setting) {
  			synchronized (lock) {
  				setting = settingMap.get(name);
  				if (null == setting) {
  					String filePath = name;
  					String extName = FileUtil.extName(filePath);
  					if(StrUtil.isEmpty(extName)) {
  						filePath  = filePath + "." + Setting.EXT_NAME;
  					}
  					setting = new Setting(filePath, true);
  					settingMap.put(name, setting);
  				}
  			}
  		}
  		return setting;
  	}