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Viewing file:     pledge.js (779 B)      -rw-r--r--

'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;