custom-event-emitter.js
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var util = require("util")
, EventEmitter = require("events").EventEmitter
, Promise = require("promise")
, proxyEventKeys = ['success', 'error', 'sql']
, tick = (typeof setImmediate !== "undefined" ? setImmediate : process.nextTick)
, Utils = require('../utils')
var bindToProcess = function(fct) {
if (fct && process.domain) {
return process.domain.bind(fct)
}
return fct
}
module.exports = (function() {
var CustomEventEmitter = function(fct) {
this.fct = bindToProcess(fct)
}
util.inherits(CustomEventEmitter, EventEmitter)
CustomEventEmitter.prototype.run = function() {
tick(function() {
if (this.fct) {
this.fct.call(this, this)
}
}.bind(this))
return this
}
CustomEventEmitter.prototype.success =
CustomEventEmitter.prototype.ok =
function(fct) {
this.on('success', bindToProcess(fct))
return this
}
CustomEventEmitter.prototype.failure =
CustomEventEmitter.prototype.fail =
CustomEventEmitter.prototype.error =
function(fct) {
this.on('error', bindToProcess(fct))
return this;
}
CustomEventEmitter.prototype.done =
CustomEventEmitter.prototype.complete =
function(fct) {
fct = bindToProcess(fct);
this.on('error', function(err) { fct(err, null) })
.on('success', function() {
var args = Array.prototype.slice.call(arguments);
args.unshift(null);
fct.apply(fct, args);
})
return this
}
CustomEventEmitter.prototype.sql = function(fct) {
this.on('sql', bindToProcess(fct))
return this;
}
/**
* Proxy every event of this custom event emitter to another one.
*
* @param {CustomEventEmitter} emitter The event emitter that should receive the events.
* @return {void}
*/
CustomEventEmitter.prototype.proxy = function(emitter, options) {
options = Utils._.extend({
events: proxyEventKeys,
skipEvents: []
}, options || {})
options.events = Utils._.difference(options.events, options.skipEvents)
options.events.forEach(function (eventKey) {
this.on(eventKey, function (result) {
emitter.emit(eventKey, result)
})
}.bind(this))
return this
}
CustomEventEmitter.prototype.then = function(onFulfilled, onRejected) {
var self = this
onFulfilled = bindToProcess(onFulfilled)
onRejected = bindToProcess(onRejected)
return new Promise(function (resolve, reject) {
self.on('error', reject)
.on('success', resolve);
}).then(onFulfilled, onRejected)
}
return CustomEventEmitter
})()