a promise factory

promise_factory.js

/**
 * dependencies
 */

var q = require('q');

/**
 * lib
 */

// TODO: THINK ABOUT RETURN VALUES AND PARAMS!

keeper = (function () {
  var proto = {},
      self = function () { return Object.create(proto); },
      promise = q.fcall(function () {});

  self.addSync = function (i, fn) {
    proto[i] = function () {
      var obj = this,
          args = arguments;
      promise = promise.then(function () {
        return fn.call(obj, args);
      });
      return obj;
    };
    return self;
  };

  self.addAsync = function (i, fn) {
    proto[i] = function () {
      var obj = this,
          args = arguments;

      promise = promise.then(function () {
        var deferred = q.defer();
        obj.callback = deferred.resolve;
        fn.call(obj, args);
        return deferred.promise;
      });
      return obj;
    };
  };

  // add error handling function here

  return self;
}());

/**
 * extend keeper
 */

keeper
  .addSync('setBase', function (base) {
    console.log('setBase');
  })
  .addAsync('request', function () {
    console.log('request');

    var that = this;
    setTimeout(function () {
      that.callback();
    }, 1000);
  });

/**
 * usage
 */

var dt = keeper()
           .setBase('base 1')
           .request()
           .setBase('base 2');

console.log('before');

var createBaseObject = function () {
  return keeper()
          .setBase('asdasd');
};

createBaseObject()
  .request('asdasdasd');