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README
Apache-2.0

OneMessage

一个基于 发布-订阅模型的跨平台消息框架,纯C语言编写,性能和灵活性极高


什么是OneMessage

OneMessage核心为订阅发布的消息框架,包含了红黑树,链表,队列,crc校验和终端文本格式控制五个基本组件的完整实现。在此基础上完成了如下六个功能模块:

  • MSG 消息/话题控制: 控制消息的订阅与发布,话题和订阅者的创建与管理
  • FMT 格式化配置:为用户提供格式化字符串的方式来快速配置话题/订阅/过滤器
  • EVT 事件机制:基于topic实现的事件触发机制
  • LOG 日志系统:多等级的日志打印
  • AFL 高级过滤器:为topic提供灵活的筛选方式
  • COM 通信解析:用于跨进程/跨设备共享topic

本项目旨在为跨线程和跨设备通信提供一个通用解决方案,以较小的性能代价换取数倍的开发效率。

在STM32F103上使用-Og优化选项下的GCC编译本框架,FLASH占用增加4.2k.

相关概念

在OneMessage里只有两种主体,话题(topic)和订阅者(sub/suber/subscriber)。一个消息一定是先被发送到一个话题上,经过筛选/回调/转发等方式发送到另一个话题或订阅者。

话题可以配置filter_function,简单筛选可以发布到此话题的消息,也可以配置高级过滤器(AFL),通过一些较为复杂的规则,将此话题的数据筛选并发布到其他的话题。话题可以通过开关缓冲区来实现无拷贝发布,通过对话题加锁保证线程安全。

订阅者分为以下几种:1.用于检测话题数据更新,并导出话题数据(export)2.用于将话题数据放在队列中,防止消息丢失(queue/fifo)3.存放用户注册的回调函数,在对应话题发布消息时调用(同步方式获取数据/suber_callback)4.用于连接两个话题,源话题发布消息时转发到目标话题上(link)

几乎所有API都提供动态/静态内存分配两种接口,静态需要用户手动创建数据结构体,并保证变量一直存活,而且无法对其使用删除相关的API。

PS:不定长消息为实验功能,强烈建议每个话题的消息长度为定长。

文档

配置文件

使用说明

开发文档

系统支持

已在Linux,FreeRTOS,ThreadX上成功运行,欢迎适配到其他平台。

特性

  • 发布-订阅

    • 底层由红黑树+链表实现,查找与遍历都有良好的性能表现
    • 话题为操作的主体,匿名发布且不限制订阅者数量
    • 支持零拷贝发布
    • 订阅者可开启内置队列,防止消息丢失
  • 安全性

    • 保证线程安全
    • 允许在中断中使用
    • 提供静态API,可以实现无动态内存分配
    • 单元测试覆盖所有功能
  • 消息过滤器

    • 支持为每个话题和订阅者注册过滤器,只接受符合条件的消息
  • 订阅回调

    • 订阅者可在接收时调用用户回调函数,暂存数据或者转发到另一个话题。
  • 快速配置

    • 使用格式化输入的方式配置话题,极少的代码量就能实现整个消息网络的搭建
  • 事件触发

    • 以订阅为核心的事件触发器,在保证执行效率的同时,一个触发条件可以对应多个处理函数。
  • 批量筛选

    • 对于条件简单且分支较多的话题,可开启高级过滤器而不需要注册大量函数,现已支持 列表范围分解模式。例如针对id筛选CAN总线数据,或者将结构体拆分后发布。
  • 话题共享

    • 提供topic数据打包与解析api,可通过任意协议共享多个topic数据,实现跨进程和跨设备通信。通过fifo与crc校验保证数据完成性,在拆包/组包/错位和夹杂无效数据的情况下也能确保正确解析。
  • 日志框架

    • 使用示例程序打印的日志:效果

获取源码

克隆这个仓库

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Github

git clone https://github.com/Jiu-xiao/OneMessage.git

或者使用 git submodule将其包含在你的仓库中

git submodule add https://github.com/Jiu-xiao/OneMessage.git <path>

代码结构

OneMessage
├─config
├─src
  ├─app
  ├─comp
  └─core
└─test
文件夹 功能
config 配置文件模板
doc 文档
src/app 应用
src/comp 组件
src/core 核心api
src 用户接口
test 单元测试
example 例程

C++

C++兼容层OneMessageCPP

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简介

一个基于发布-订阅模型的多线程消息框架,用于嵌入式平台,纯C实现,性能和灵活性极高 展开 收起
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