68 lines
1.6 KiB
JavaScript
68 lines
1.6 KiB
JavaScript
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'use strict'
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const EventEmitter = require('events').EventEmitter
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const helper = require('./helper')
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function bufferEvents (emitter, eventsToBuffer) {
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const listeners = []
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const eventsToReply = []
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function genericListener () {
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eventsToReply.push(Array.from(arguments))
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}
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eventsToBuffer.forEach((eventName) => {
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const listener = genericListener.bind(null, eventName)
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listeners.push(listener)
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emitter.on(eventName, listener)
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})
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return function () {
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listeners.forEach((listener, i) => {
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emitter.removeListener(eventsToBuffer[i], listener)
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})
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eventsToReply.forEach((args) => {
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EventEmitter.prototype.emit.apply(emitter, args)
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})
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listeners.length = 0
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eventsToReply.length = 0
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}
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}
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class KarmaEventEmitter extends EventEmitter {
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bind (object) {
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for (const method in object) {
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if (method.startsWith('on') && helper.isFunction(object[method])) {
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this.on(helper.camelToSnake(method.slice(2)), function () {
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// We do not use an arrow function here, to supply the caller as this.
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object[method].apply(object, Array.from(arguments).concat(this))
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})
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}
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}
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}
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emitAsync (name) {
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// TODO(vojta): allow passing args
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// TODO(vojta): ignore/throw if listener call done() multiple times
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let pending = this.listeners(name).length
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const deferred = helper.defer()
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this.emit(name, () => {
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if (!--pending) {
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deferred.resolve()
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}
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})
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if (!pending) {
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deferred.resolve()
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}
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return deferred.promise
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}
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}
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exports.EventEmitter = KarmaEventEmitter
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exports.bufferEvents = bufferEvents
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