1. Building real-time apps
with node.js, socket.io
and knockout.js
Betabeers Zaragoza, 09/03/2012
Iván Loire
twitter: @ivanloire
email: ivan@iloire.com
Monday, March 12, 2012

2. you want real-time apps?
get the fastest tools!
Monday, March 12, 2012

3. node.js
high performance javascript library for intensive I/O
operations. (like HTTP)
single threaded, event oriented.
built on Chrome’s Javascript runtime (V8)
lightweight, efficient, really fast.
.. insanely fast.
Monday, March 12, 2012

4. websockets
bi-directional, full duplex over a single tcp socket.
connection remains open = no tcp handshake
lightweight protocol = no http headers, 2 byte
overhead
supported chrome 16, FF 11, IE 10, Opera 10
reducing latency from 150 (http) to 50 ms (sockets)
Monday, March 12, 2012

5. socket.io
websockets for the rest of us.
fallback transports (yes, it also works in IE!!)
websockets
flash sockets
ajax long polling
ajax streaming
iframe
json polling..
Monday, March 12, 2012

6. knockout.js
rich, responsive display with a clean underlying data
model.
declarative bindinds
automatic UI refresh
dependency tracking
templating
Monday, March 12, 2012

7. ... and a fast database!
open source, high performance, in-memory, key-value
data store
support master-slave replication
really fast!
if durability is not needed... insanely fast!
Monday, March 12, 2012

8. real-time web apps
node.js + redis + socket.io + knockout.js
real-time... or close enough?
Monday, March 12, 2012

9. let’s build a really simple real-time game...
code: https://github.com/iloire/math-race
demo: http://letsnode.com:8090/
thanks to @gimenete for getting me into node.js!
... and thanks to @jmendiara for the node.js sticker!
Thanks!
Iván Loire (twitter: @ivanloire)
Monday, March 12, 2012