apollo-configservice/src/main/java/com/ctrip/framework/apollo/configservice/controller/ConfigController.java/ConfigController/transformMessages
class ConfigController:  ApolloNotificationMessages transformMessages(String messagesAsString) {
    ApolloNotificationMessages notificationMessages = null;
    if (!Strings.isNullOrEmpty(messagesAsString)) {
      try {
        notificationMessages = gson.fromJson(messagesAsString, ApolloNotificationMessages.class);
      } catch (Throwable ex) {
        Tracer.logError(ex);
      }
    }

    return notificationMessages;
  }