javascript - 处理 EventEmitter 和循环需求的更好方法是什么？

Question

我有这样的用户服务:

'use strict';

let events = require('services/events');

module.exports = {
    create: function (data) {
        doCreate(data).then(user => {
            events.emit('user.create');
        });
    },

    addBonus: function (transaction) {
        doSomething;
    }
}

我有 events 模块:

'use strict';

let EventEmitter = require('events').EventEmitter;
let pubsub = new EventEmitter();
let userService = require('services/user'); 

pubsub.on('user.create', function(user) {
    console.log('EVENT: user.create');
    doSomething();
}

pubsub.on('payment.success', function(transaction) {
   userService.addBonus(transaction); // check if it was first transaction then add bonus to user
}

module.exports = pubsub;

在这种情况下，代码有循环要求，并且代码不起作用。

我认为当 events 模块使用在该模块中发出事件的服务时很常见。设计这种情况的更好方法是什么？我有下一个想法:

• 创建一些按事件类型分类的事件模块
• 在user服务中使用构造函数

Answer 1

也许将代码分解成多个文件:

// services/user/create
let events = require('services/events');
module.exports = {
    create: function (data) {
        doCreate(data).then(user => {
            events.emit('user.create');
        });
    },
}

// services/user/addBonus
module.exports = {
    addBonus: function (transaction) {
        doSomething;
    }
}

// services/events
let EventEmitter = require('events').EventEmitter;
let pubsub = new EventEmitter();
let userService = require('services/user/addBonus'); 

pubsub.on('user.create', function(user) {
    console.log('EVENT: user.create');
    doSomething();
}

pubsub.on('payment.success', function(transaction) {
   userService.addBonus(transaction); // check if it was first transaction then add bonus to user
}