nodejs tour

JavaScript on the Server Side

I’M ARUNODA

INTRODUCTION Framework to built Servers It’s about JavaScript Created by Ryan Dhal in 2009

ARCHITECTURE

Event LoopLibEV

Thread PoolLibIO

JS EngineV8

NodeJS bindings (http, socket, IO etc..)

JavaScript C++

PROGRAMMING MODEL Evented - No Threads Non Blocking IO Use of callbacks (closure)

db.insert({data: 1000}, function(err) {   //do something after inserted})console.log("I don't wait");

SUPPORT Commercial –

Community – Mainly over Just 2 years old~2500 modules~800 authors~300 new modules per month~2000 new module updates per month

WEB AND NODEJS Websites

ConnectExpress

REST APIExpressGeddy

CommunicationSocket IONow JS (RPC)Dnode (RPC)

HTTP API - RESTler

EXPRESS - SAMPLE

var app = express.createServer(); app.get('/info', function(req, res){ res.send('Hello World');}); app.listen(3000);

NOWJS - SAMPLE

var server= require("http").createServer();

var nowjs = require("now");var remote= nowjs.initialize(httpServer); remote.now.getServerInfo = function(callback){ getInfo(callback);}server.listen(8000);

<script>now.getServerInfo(function(data){ //do something with the data});</script>

Server.js

Access.html

RESTLER - SAMPLE

var rest = require("restler"); rest.get("http://google.com").on("complete", function(data) { console.log(data);});

DATABASE SUPPORT

PACKAGE MANAGER It’s called NPM Like ivy But with JSON

npm install expressnpm publish

IDE It’s BAD No great debugger Cloud9 IDE Sublime Text 2

HOSTING

NODEJS EXPERIENCE Started 3 months back Rewritten Yalu on NodeJS Improved Performance

Projects on

USEFULL LINKS NodeJS Sri Lanka

bit.ly/nodelk

Node Linksbit.ly/node-info

THANKS Any Questions?