javascript on the server - node.js

JavaScript on the server

Node.Js

Logical Architecture RIA

Raw data, relational or not

Something QL-like

Classes, Business or Application Logic

Interface to the back-end

Handles events and calls services

Representation of data, interact with user

Subset of data needed for the view

server

browser

Old Fashioned Setup

MySQL

MySQLi PHP

PHP

XHTML

PHP

http

Disadvantages Old Fashioned Setup

Mix of HTML and PHP Heavy HTTP traffic

server

browser

Classical Setup

MySQL

PDO POPO

PHP

HTML5

JavaScript/jQuery

JSON

http

Disadvantages Classical Setup

Still need to learn different languages with a different development model

PHP is on its return

Don’t put your money on PHP

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Job Offerings Dice.com (2012)Java 17,599 (+8.96%)XML 10,780 (+11.70%)JavaScript 10,738 (+11.64%)HTML 9,587 (-1.53%)C# 9,293 (+17.04%)C++ 6,439 (+7.55%)AJAX 5,142 (+15.81%)Perl 5,107 (+3.21%)PHP 3,717 (+23%)Python 3,456 (+32.87%)Ruby 2,141 (+39.03%)HTML5 2,035 (+276.85%)Flash 1,261 (+95.2%)Silverlight 865 (-11.91%)COBOL 656 (-10.75%)Assembler 209 (-1.42%)PowerBuilder 126 (-18.71%)FORTRAN 45 (-33.82%)

Programming Book sales (2012)1. Java2. JavaScript3. C#4. Objective C5. C++6. PHP7. VBA8. Python9. SQL10. ActionScript

server

browser

Modern Setup

MongoDB

Mongoose JSON

JavaScript

HTML5

JavaScript/jQuery

JSON

http

websockets

Advantages Modern Setup

Only one development language: JavaScript

Not only HTTP, WebSockets to the rescue

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

Node

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

Node Architecture

http://www.gliffy.com/publish/2752090/

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

Node: Connect

var connect = require("connect”);connect().

use(connect.static(__dirname +

"/../client")).listen(8000);

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");

}); });

Node: Socket.IO

Browser initiates

Serverinitiates

WebSockets vs HTTP

Use case A: 1,000 clients

Use case C: 100,000 clients

Use case B: 10,000 clients

http://www.websocket.org/quantum.html

StockQuote using XmlHttpRequest

Browser initiates

StockQuote using WebSockets?

Serverinitiates

Too bad Yahoo does not support WebSockets yet

Node: Write your own module

var Player = require('../model/Player.js');

function EntityManager() {this.saveNewPlayer = function(name,

club, playerNumber, saveReadyFunction) {// do something cool here

}}

module.exports = EntityManager;

Use one or more other modules, external or your own

Simple constructor

Let other modules know what we can do for them

Mongo

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

Mongo Architecture

Mongoose

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.”

Mongoose example

http://mongoosejs.com/index.html