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async-fn-queue

v1.1.3

Published

一个异步函数队列化执行库

Downloads

2

Readme

async-fn-queue

一个异步函数队列化执行库

async-fn-queue

Intro

这个库可以将多个异步操作在队列中执行,并且能动态追加异步操作,满足在特殊场景下串行化异步操作需求

Install

npm install async-fn-queue --save

Usage

下面是一个数据同步的示例,在同步本地和服务器数据时,我们通常希望串行化请求,于是我们可以使用异步队列来进行操作

import queue from 'async-fn-queue'
import http from 'axios'

/**
 * 同步数据
 */
function sync () {
    // 使用队列名获取队列(不存在则自动创建)并执行该队列
    queue.get('sync').next(async () => {
        // 获取本地数据
        let localData = JSON.parse(localStorage.getItem('data'))
        // push 到服务端
        await http.post('/data/push', localData)

        // 拉取服务端新数据
        let newData = await http.post('/data/pull')
        // 合并到本地
        localData = localData.concat(newData)
        localStorage.setItem('data', JSON.stringify(localData))
    })
}

// 获取同步按钮
let btn = document.getElementById('#btn-sync')

// 无论用户连续点击或直接调用 sync 函数多少次,接口都只会串行请求
btn.addEventListener('click', sync)

sync()
sync()
sync()
...

Api

import queue from 'async-fn-queue'

// queue.get: 创建或获取一个队列
var q = queue.get('queue_name')
// 获取默认队列
var q = queue.get()
// queue 本身就是默认队列
queue === queue.get()    // true
// 任何队列都可以获取和创建新的队列
var newQueue = q.get('new_queue')

// queue.push: 将异步操作函数添加到队列(入队)
q.push(async () => {
    // 异步操作 F1
})
q.push(async () => {
    // 异步操作 F2
})
// 同时也支持同步操作
q.push(() => {
    // 同步操作 F3
})

// queue.start: 开始执行队列中的异步操作(将依次执行操作 F1、F2、F3)
q.start()

// 调用 start 后追加的新异步操作需要显性调用 start 才会执行
q.push(async () => {
    // 异步操作 F4(将在 F1、F2、F3 执行完后开始执行 F4)
}).start()

// queue.next: 添加并执行下一个异步操作,等同于 q.push(fn).start()
q.next(async () => {
    // 异步操作 F5(将在 F1、F2、F3、F4 执行完后开始执行 F5)
})

// queue.pause: 暂停执行队列中的异步操作
q.pause()

// queue.stop: 停止执行并清除队列中的异步操作
q.stop()


// 支持链式调用
q.push(fn).push(fn).start().next(fn).pause().stop()

// 使用默认队列
queue.push(fn).push(fn).start().next(fn).pause().stop()

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