Lecture for CRIA-WT about JavaScript on the server. Explains why we prefer Node.js over PHP and shows the architecture, modules and a small demo application on https://github.com/rodmidde/cria-wt-demo/tree/master/NODE/SimpleMVC.

1. JavaScript on the
server
Node.Js

2. Logical Architecture RIA
Representation of data, Subset of data
interact with user needed for the view
Handles events
and calls services
Interface to the
back-end
Classes, Business or
Application Logic
Something QL-
like
Raw data,
relational or not

3. Old Fashioned Setup
XHTML browser
http
PHP
PHP
server
MySQLi PHP
MySQL

4. Disadvantages Old Fashioned
Setup
 Mix of HTML and PHP
 Heavy HTTP traffic

5. Classical Setup
HTML5 JSON
browser
JavaScript/jQuery
http
PHP
PDO POPO server
MySQL

6. Disadvantages Classical Setup
 Still need to learn different languages with a
different development model
 PHP is on its return

7. Don’t put your money on PHP
Hacker News Survey (2012) Job Offerings Dice.com (2012)
Python (3,054) Java 17,599 (+8.96%)
Ruby (1,723) XML 10,780 (+11.70%)
JavaScript (1,415) JavaScript 10,738 (+11.64%)
C (970)
HTML 9,587 (-1.53%)
C# (829)
PHP (666) C# 9,293 (+17.04%)
Java (551) C++ 6,439 (+7.55%)
C++ (529) AJAX 5,142 (+15.81%)
Haskell (519) Perl 5,107 (+3.21%) Programming Book sales (2012)
Clojure (459) PHP 3,717 (+23%) 1. Java
CoffeeScript (362) Python 3,456 (+32.87%) 2. JavaScript
Objective C (326) Ruby 2,141 (+39.03%) 3. C#
Lisp (322)
HTML5 2,035 (+276.85%) 4. Objective C
Perl (311)
Scala (233) Flash 1,261 (+95.2%) 5. C++
Scheme (190) Silverlight 865 (-11.91%) 6. PHP
Other (188) COBOL 656 (-10.75%) 7. VBA
Erlang (162) Assembler 209 (-1.42%) 8. Python
Lua (145) PowerBuilder 126 (-18.71%) 9. SQL
SQL (101) FORTRAN 45 (-33.82%) 10. ActionScript
http://readwrite.com/2012/06/05/5-ways-to-tell-which-programming-lanugages-are-most-popular

8. Modern Setup
HTML5 JSON
browser
JavaScript/jQuery
websockets
http
JavaScript
Mongoose JSON server
MongoDB

9. Advantages Modern Setup
 Only one development language: JavaScript
 Not only HTTP, WebSockets to the rescue

10. Disadvantages Modern Setup
 OO in JavaScript is doable but PHP syntax
resembles Java/C# more
 Node hosting is harder to get than PHP hosting
 Node’s learning curve is more sheer compared
to PHP

11. Node

12. Node.js in one slide
 Built On Chrome's JavaScript V8 Engine
 Node.js is a general-purpose JavaScript runtime
with a host of powerful libraries -- one of which
happens to provide an HTTP/HTTPS server
implementation
 Node.js Is Object-Oriented
 Evented (Async) I/O
 Package Management with npm

13. Node Architecture
http://www.gliffy.com/publish/2752090/

14. Node Modules
 Connect: Extensible HTTP server framework
 Socket.IO: WebSockets and Realtime
 Mocha: BDD/TDD Test Runner
 Express: Web Framework build on Connect
 JSLint, JSHint: JavaScript Quality Tools
 Jasmine: BDD/TDD Test Runner
 Mongoose: ODM for MongoDB

15. Node: Connect
var connect = require("connect”);
connect().
use(connect.
static(__dirname + "/../client")).
listen(8000);

16. Node: Socket.IO
var io = require("socket.io").listen(1337);
io.sockets.on("connection", function (socket) {
socket.on("saveNewPlayer", function (data)
{
console.log(data);
socket.emit("saveReady");
});
});

17. Node: Socket.IO
Browser
initiates
Server
initiates

18. WebSockets vs HTTP
Use case A: 1,000 clients
Use case B: 10,000 clients
Use case C: 100,000 clients
http://www.websocket.org/quantum.html

19. StockQuote using XmlHttpRequest
Browser
initiates

20. StockQuote using WebSockets?
Server
initiates
Too bad Yahoo does not support WebSockets yet 

21. Node: Write your own module
Use one or more other modules,
external or your own
var Player = require('../model/Player.js');
Simple
constructor
function EntityManager() {
this.saveNewPlayer = function(name, club,
playerNumber, saveReadyFunction) {
// do something cool here
}
} Let other modules know what
we can do for them
module.exports = EntityManager;

22. Mongo

23. Mongo in one slide
 Stores data as bson (binary JSON)
 Console uses JavaScript and json
 3rd party GUI tools
 Database runs as an exe or Windows service
 Memory mapped so really needs 64bit OS
 User group on Google Groups [busy]
 Sharding for fast access and huge storage
files.meetup.com/2313351/Mongo.pptx

24. Mongo Architecture

25. Mongoose

26. Mongoose in one slide
 “Mongoose is the 10gen-supported ODM for
Node.js. It has a thriving open source community
and includes advanced schema-based features
such as async validation, casting, object life-
cycle management, pseudo-joins, and rich query
builder support.”

27. Mongoose example
http://mongoosejs.com/index.html