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@followwinter/state-machine

v1.0.2

Published

状态机,编排复杂流程

Downloads

7

Readme

state-machine

状态机,编排复杂业务流程的

特性

  • 配置化,让业务流程更加清晰可见,代码即业务
  • 分离原子任务和流程控制器,更加彻底的 DIY,方便 Unit Test

使用方式

  • 引入
npm install @followwinter/state-machine
  • 配置
        const taskA = ()=>{return 'payloadFromA'}
        const taskB = (payload)=>{console.log(payload)}
        
        const stateMachine = new StateMachine({
            'A': {
                task: taskA,
                next: 'B'
            },
            'B': {
                task: taskB,
            }
        })
        stateMachine.run('A', 'initialPayload') // 输出 payloadFromA

API

  • StateMachine:

    • constructor(config, name): StateMachine - 构造一个状态机
      • config: object - 状态机配置,key 为状态,value 是 Task
      • name: string - 状态机名称,如果不需要可以不用
    • run(state, payload): void - 指定初始状态和负载执行状态机
      • state: string - 初始状态
      • payload: object - 负载
  • Task:

    • task: function - 该状态的任务,可以返回 promise 或者任意值
    • next: string | function | object - 下一个任务的状态转化器,可以有以下三种类型:
      • string:直接指定状态
      • function:将任务的执行结果作为入参数,该函数的声明如下:
        • function(prePayload: object): {state: string, payload: object}
      • object: 将任务执行的结果作为 key,在该对象中查找,将命中的 value 作为下一个状态。