If you're not using node to build collaborative real time applications you might as well be using rails. In this talk we'll discuss patterns and pitfalls of synchronous node apps. We'll roll up our sleeves and dig into some code demonstrating patterns that can help you get started building highly interactive applications that sync real time state with Node.js, Socket.io, and Backbone.js. You will leave this talk with insight on how to build synchronous experiences into your applications and avoid some of the pitfalls we've suffered.

2. BETTER TOGETHER
Kav Latiolais (@kavla)
Partner - LIFFFT

3. A Brief Aside

9. System Design

26. Calling Server
Client
socket.emit 'function',
function: 'authUser'
token: response.authResponse.accessToken
Server
socket.on 'function', (data, cb) ->
unless data.function? then return cb false
if functions[data.function] is undefined then return cb false
functions[data.function](data, socket, cb)
functions =
authUser: (data, socket,cb) ->
return cb false unless isValidFBToken(data.token)
doSomeOtherBusinessLogicMagic(user)
socket.user.set token:data.token
return cb true

27. Changes to Client
Server
user.bind 'all', socketTunnelEvents(io.channel, ['room', 'user'])
socketTunnelEvents = (tunnelSocket, object) ->
(eventName, data) =>
if eventName.indexOf(':') is -1
tunnelSocket.emit 'backbone',
action: eventName
object: object
model: data

28. Changes to Client
Client
# Model event sent to us on a model
if not _.isArray(data.model) and not _.isArray(obj.toJSON())
return obj.set(data.model)
# Collection event sent on collection
if _.isArray(data.model) and _.isArray(obj.toJSON())
return obj.reset(data.model)

29. Changes to Client
Client
# Model event sent on collection
if not _.isArray(data.model) and _.isArray(obj.toJSON())
switch data.action
when 'add'
return obj.add data.model
when 'remove'
return obj.remove data.model
when 'change'
model = obj.get data.model
return model.set data.model
# when 'destroy'

30. Questions?
Kav Latiolais - @kavla