code: func (configMgr *ConfigurationManager) Refresh(sourceName string) error {
  	err := configMgr.pullSourceConfigs(sourceName)
  	if err != nil {
  		openlogging.GetLogger().Errorf("fail to load configuration of %s source: %s", sourceName, err)
  		errorMsg := "fail to load configuration of" + sourceName + " source"
  		return errors.New(errorMsg)
  	}
  	return nil
  }
docs: // Refresh refreshes the full configurations of all the dimnesionInfos