La presentación sobre Node JS que hice para el Meetup de Lenguajes Dinámicos.

1. Web en tiempo real

2. EVENTED I/O

3. MODELO TRADICIONAL
Server DB

4. MODELO TRADICIONAL
Server DB

5. MODELO TRADICIONAL
Server DB

6. MODELO C/EVENTOS
Server DB

7. MODELO C/EVENTOS
Server DB

8. MODELO C/EVENTOS
Main
Loop
DB

9. Twisted
EventMachine

10. Evented I/O for V8 JavaScript.

11. INSTALACIÓN
$ curl -O http://nodejs.org/dist/node-v0.2.5.tar.gz
# http://nodejs.org/#download
$ tar xvf node-v0.2.5.tar.gz
$ cd node-v0.2.5
$ ./configure
$ make
$ sudo make install
$ node --version
# => v0.2.5
$ node
> // modo interactivo
> [Ctrl+C]

12. DOCUMENTACIÓN
http://nodejs.org/api.html

13. ESTRUCTURA
Framework de bajo nivel

14. SERVIDOR WEB
1 var http = require('http');
2
3 http.createServer(function (req, res) {
4 res.writeHead(200, {'Content-Type': 'text/plain'});
5 res.end('Hello Worldn');
6 }).listen(8124, "127.0.0.1");
7
8 console.log('Server running at http://127.0.0.1:8124/');

15. EXPRESS 1
2
var app = express.createServer();
Node’s Sinatra 3 app.get('/', function(req, res){
4 res.send('Hello World');
5 });
http://expressjs.com/ 6
7 app.listen(3000);

16. SISTEMA DE
PAQUETES

17. NODE PACKAGE MANAGER
http://npmjs.org/

18. WEB SOCKETS

19. CONEXIÓN PERSISTENTE

20. BAJO NIVEL
1 var sys = require('sys'),
2 WebSocket = require('../websockets');
3
4 function TimeJS () {
5 var self = this;
6
7 this.websocket = new WebSocket.Server({resource: '/time', host: 'localhost'});
8 this.connections = new Array();
9
10 this.websocket.addListener('connect', function (server, connection) {
11 self.connections[connection.socket.fd] = "";
12 });
13 this.websocket.addListener('disconnect', function (server, connection) {
14 clearInterval(self.connections[connection.socket.fd]);
15 self.connections.splice(self.connections.indexOf(connection.socket.fd), 1);
16 });
17 this.websocket.addListener('receive', function (data, connection) {
18 if (data == 'start') {
19 self.connections[connection.socket.fd] = setInterval(function () {
20 connection.write(JSON.stringify({time: new Date().toString()}));
21 }, 1000);
22 }
23 });
24 }
25
26 new TimeJS();
https://github.com/jackyyll/nodejs-websockets

21. Faye is an easy-to-use publish-subscribe
messaging system based on the Bayeux
protocol.
It provides message servers for Node.js and Rack,
and clients for use in Node and Ruby programs
http://faye.jcoglan.com

22. INICIAR UN SERVIDOR
1 var Faye = require('faye'),
2 server = new Faye.NodeAdapter({mount: '/'});
3
4 server.listen(8000);

23. CREAR UN CLIENTE
5 var client = new Faye.Client('http://localhost:8000/');
6
7 client.subscribe('/messages', function(message) {
8 alert('Got a message: ' + message.text);
9 });

24. ENVIAR MENSAJES
10 client.publish('/messages', {
11 text: 'Hello world'
12 });

25. MAS SIMPLE
Web Sockets as a Service
http://pusherapp.com/

26. (DEMO)
https://github.com/sagmor/mapsketcher

27. Fotos: sjunnesson, atranman, denial_land,
moriza, ghero79 @ Flickr