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waiting-queue

v1.0.7

Published

waiting queue

Downloads

3

Readme

waiting-queue

waiting queue
等待队列:等待队列通过控制到处理模块的并发数 缓解压力以防止业务模块雪崩
目标:以此来缓解瞬时请求压力过大 造成大面积拒绝 比如 处理用户整点的闹钟请求

NPM version npm download David deps

use

npm install waiting-queue

create

  • new WaitingQueue(opt);
    • opt.concurrent 处理的并发度, 超过该值 则进入排队
    • opt.process(request) 请求处理函数
  • waitQueue.add(request);
    • request.acquireTimeout 等待处理的超时时间 从进入队列 到进入处理逻辑 默认5s
    • request.requestId (optional) 优化请求,避免重复请求 为空则每个逻辑都会处理 非空 当请求处理完成后(或者失败)则队列中requestId的也直接使用响应
    • request.process(request) 请求处理, 由于有requestId的逻辑 所以request和callback并不一一对应

    request.process优先级大于opt.callback

const WaitingQueue = require('../index').WaitingQueue;

let queue = new WaitingQueue({
    concurrent: 2
});

function process(i) {
    return new Promise((resolve, reject) => {
        setTimeout(() => {
            resolve(i);
        }, 3000);
    });
}
const max = 5;
for(let i = 0; i < max; i++) {
    queue.add({
        id: i,
        process: process
    }, {
        waitTimeout: 1000
    }).then(id => {
        console.log('%s finish', i, id);
    }).catch(error => {
        console.error('%s error:%s', i, error.message);
    });
}