TimBeyer

{
  "name": "What is a collection",
  "description": null,
  "displayField": "plainText",
  "fields": [
    {
      "id": "plainText",
      "name": "plainText",
      "type": "Text",
      "localized": false,

TimBeyer

var contentful = require('contentful')
var util = require('util')
var client = contentful.createClient({
  // This is the space ID. A space is like a project folder in Contentful terms
  space: 'developer_bookshelf',
  // This is the access token for this space. Normally you get both ID and the token in the Contentful web app
  accessToken: '0b7f6x59a0'
});

// This API call will request an entry with the specified ID from the space defined at the top, using a space-specific access token.

TimBeyer

'use strict';

var assert = require('assert'),
  director = require('director'),
  EventEmitter = require('events').EventEmitter,
  ns,// = require('continuation-local-storage').createNamespace('testing'),
  express = require('express'),
  app = express(),
  domain = require('domain');

TimBeyer

var uuid = require('node-uuid');
var _ = require('lodash');

var privates = {};

function MyClass () {
    this.id = uuid.v4();
    privates[this.id].foobar = 'somethingprivate';
};

TimBeyer

var items = [{'price': 123, 'tax': 0.1}, {'price': 234, 'tax': 0.3}];

var taxCalculator = function (items) {
        
    var taxedMapper = function (item) {
        return item.price + item.price * item.tax;
    };
    
    var nonTaxedMapper = function (item) {
        return item.price;

TimBeyer

Working using domains

In this example we'd like to have a factory that works per request and allows to keep track of created Models We create a factory per request and create a domain to which we attach the factory That way the singleton is automatically shared with all parts of the application under process.domain.*

TimBeyer

Working but complicated

In this example we'd like to have a factory that works per request and allows to keep track of created Models We create a factory per request and pass it around to the parts of the code that need access This can quickly lead to hard to understand, messy code

TimBeyer

// In this example we'd like to have a factory that works per request and allows to keep track of created Models
// The singleton will however apply to all requests and thus keep growing
// For that reason we supply it with a reset function.
// This works fine until between receiving a request and sending a response there is no asynchronous code execution
// Once multiple requests come in in very short intervals, the asynchronous execution will lead to requests cross-polluting
// the singleton class

// factory.js
// 
// Should be per-request so we can keep track

TimBeyer

var planout = require('planout');

function getOwnPropertyDescriptors (obj) {
    var descriptors = {};
    for (var prop in obj) {
        if (obj.hasOwnProperty(prop)) {
            descriptors[prop] = Object.getOwnPropertyDescriptor(obj, prop);
        }
    }
    return descriptors;

TimBeyer

var planout = require('planout');

function getOwnPropertyDescriptors (obj) {
    var descriptors = {};
    for (var prop in obj) {
        if (obj.hasOwnProperty(prop)) {
            descriptors[prop] = Object.getOwnPropertyDescriptor(obj, prop);
        }
    }
    return descriptors;