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tomqueue's Introduction

TomQueue

A FIFO queue with group-level concurrency support

Install

$ npm install tomqueue

Usage

Dispatcher:

const Dispatcher = require('tomqueue').Dispatcher;
const dispatcher = new Dispatcher({
  port: 7446
});

dispatcher.start();

setTimeout(function () {
  const payload = {
    channel: 'abc',
    baseRev: 67,
    changeset: ''
  };
  dispatcher.send(payload).then((res) => {
    console.log(res);
  }).catch(console.error);
}, 3000);

Worker:

const Worker = require('tomqueue').Worker;
const worker = new Worker({
  handler(payload) {
    return processChangeset(payload);
  }
});

worker.start();

function processChangeset(data) {
  return Promise.resolve(data);
}

Payload

The method Dispatcher#send() receives a payload object, which must contain a channel property representing which channel the payload should be sent to.

Storage

TomQueue supports two storages. The default storage is memory based. To switch to the redis-based storage, set storage option to "redis":

const dispatcher = new Dispatcher({
  port: 7446,
  storage: 'redis',
  storageOptions: {
    redis: new Redis()
  }
});

tomqueue's People

Contributors

luin avatar wanming avatar

Stargazers

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Watchers

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Forkers

luoyjx

tomqueue's Issues

redis storage 简单的实现及一些问题的细节

redis storage 问题

redis 无法存储 resolvereject 在 redis 中。

目前解决方案

那么换了个思路,resolvereject 还是在原有的作用域内,利用了 Server 类继承的 EventEmitter ,它的事件机制来进行 promise 的状态改变操作。

代码见:
https://github.com/luoyjx/tomqueue/blob/dev/lib/dispatcher.js#L84-L108

新问题

在worker处理能力不足时,dispatcher的内存会暴涨,这显然不是预期的效果,但是需要dispatcher确保消息发送到worker反馈接收成功 期间,promise部分 和 listener 只能驻留在内存中。

若dispatcher或者调度器能根据dispatcher的负载来弹性伸缩worker数量的话,那内存问题也不是问题了,不过复杂度提升了。如果dispatcher来做这件事可能过于耦合了。

原有问题

不管是 memory 或是 redis 实现的 store ,在都会存在内存不可控的因素,主要还是跟 dispatcher 需要知道这条消息确实是被 worker 完整的接收到了而不仅仅是发送出去了有关。

疑问

这个 worker 是作为整个队列中的一个小部件然后消费者另外实现客户端,还是作为一个消费者的角色?

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