mirror of https://github.com/embarklabs/embark.git
56 lines
1.4 KiB
JavaScript
56 lines
1.4 KiB
JavaScript
const uuid = require('uuid/v1');
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const constants = require('../constants');
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class Events {
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/**
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* Constructs an event wrapper for processes.
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* Handles sending an event message to the parent process and waiting for its response
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* No need to create an instance of eventsWrapper for your own process, just extend ProcessWrapper
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* Then, you an use `this.events.[on|request]` with the usual parameters you would use
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*/
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constructor() {
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this.subscribedEvents = {};
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this.listenToParentProcess();
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}
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listenToParentProcess() {
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process.on('message', (msg) => {
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if (!msg.event || msg.event !== constants.process.events.response) {
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return;
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}
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if (!this.subscribedEvents[msg.eventId]) {
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return;
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}
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this.subscribedEvents[msg.eventId](msg.result);
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});
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}
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sendEvent() {
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const eventType = arguments[0];
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const requestName = arguments[1];
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let args = [].slice.call(arguments, 2);
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const eventId = uuid();
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this.subscribedEvents[eventId] = args[args.length - 1];
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args = args.splice(0, args.length - 2);
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process.send({
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event: eventType,
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requestName,
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args,
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eventId: eventId
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});
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}
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on() {
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this.sendEvent(constants.process.events.on, ...arguments);
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}
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request() {
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this.sendEvent(constants.process.events.request, ...arguments);
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}
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}
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module.exports = Events;
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