Websocket on rails Building realtime webapps 

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I'm a Java Developer who likes to ride the rails! 

The future is now! 

What's so great about Websocket? 

HTTP is half-duplex 

Asynchronous full-duplex communication Websocket is asynchronous & full-duplex 

So, a little less of this... 

So instead of this... Or this... 

Or this... 

You tell me... what's new? 

Push 

So, how to ride the rails with this? 

Introducing websocket-rails 1. echo "gem 'thin'" >> Gemfile 2. echo "gem 'websocket-rails'" >> Gemfile 3. bundle install 4. rails g websocket_rails:install 

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Ruby eventmachine 

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Map events to controller actions WebsocketRails::EventMap.describe do # You can use this file to map incoming events to controller actions. # One event can be mapped to any number of controller actions. The # actions will be executed in the order they were subscribed. namespace :rsvp do subscribe :new, :to => RsvpController, :with_method => : rsvp end end 

Use rails-like controllers class RsvpController < WebsocketRails::BaseController def initialize_session # initialize application scoped variables here @rsvp_yes_count = 0 end def rsvp @rsvp_yes_count += 1 if message broadcast_message :new_rsvp, @rsvp_yes_count end end 

Trigger and bind to events in the client $ -> dispatcher = new WebSocketRails('localhost:3000/websocket') dispatcher.on_open = (data) -> console.log "Connection has been established: #{data}" $('#rsvp_yes').bind 'click', (message) => dispatcher.trigger 'rsvp.new', true dispatcher.bind 'new_rsvp', (rsvp_yes_count) => $('#rsvp_yes_count').html rsvp_yes_count 

Broadcast to anyone out there, or... 

...only push to whom is interested 

Use complex messages and channels (1) class RsvpController < WebsocketRails::BaseController ... def rsvp @rsvp_yes_count += 1 if message[:attending] rsvp = { :yes => @rsvp_yes_count } WebsocketRails[:rsvp].trigger 'new', rsvp end end 

Use complex messages and channels (2) $ -> dispatcher = new WebSocketRails('localhost:3000/websocket') $('#rsvp_yes').bind 'click', (message) => rsvp = attending: true dispatcher.trigger 'rsvp.new', rsvp channel = dispatcher.subscribe 'rsvp' channel.bind 'new', (rsvp) => $('#rsvp_yes_count').html rsvp.yes 

Demo 

References Websocket spec ● http://dev.w3.org/html5/websockets/ Websocket-rails project page ● http://danknox.github.com/websocket-rails/ My project ● https://github.com/jeroenr/followup Ruby eventmachine ● http://rubyeventmachine.com/