Edit File: pledge.js
'use strict'; var RingBuffer = require('./ring_buffer'); var Pledge = function() { this._complete = false; this._callbacks = new RingBuffer(Pledge.QUEUE_SIZE); }; Pledge.QUEUE_SIZE = 4; Pledge.all = function(list) { var pledge = new Pledge(), pending = list.length, n = pending; if (pending === 0) pledge.done(); while (n--) list[n].then(function() { pending -= 1; if (pending === 0) pledge.done(); }); return pledge; }; Pledge.prototype.then = function(callback) { if (this._complete) callback(); else this._callbacks.push(callback); }; Pledge.prototype.done = function() { this._complete = true; var callbacks = this._callbacks, callback; while (callback = callbacks.shift()) callback(); }; module.exports = Pledge;
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