Cramp websockets
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The document discusses the CRAMP framework for building real-time web applications using WebSockets. It provides an overview of CRAMP controllers and models. For controllers, it describes initialization stages, helper methods like on_start and before_start, and setting periodic timers. For models, it shows how to define attributes, perform queries, and handle callbacks. It also demonstrates how to integrate WebSockets into CRAMP applications and send/receive data in real-time.
![CRAMP
Cramp::Controller
before_start
before_start :valid_param
def valid_user
if param[:id] =~ /[^a-zA-Z](.*)/
yield
else
halt 500, {'Content-Type' => 'text/plain'}, "Invalid ID"
end
end
@dev_ton](https://image.slidesharecdn.com/crampwebsockets-100629222851-phpapp01/85/Cramp-websockets-17-320.jpg)
![CRAMP
Cramp::Controller
respond_with
def respond_with
content_type = params[:format] == 'xml' ? 'application/xml' : 'application/json'
[200, {'Content-Type' => content_type}]
end
@dev_ton](https://image.slidesharecdn.com/crampwebsockets-100629222851-phpapp01/85/Cramp-websockets-21-320.jpg)
![CRAMP
Cramp::Model
EM.run do
User.select(:id, :name).limit(10).offset(20).first {|u| .. }
User.where(User[:name].eq('Lush')).limit(2).all {|users| ... }
User.each {|user| .. }
def lush_users_found(users)
...
end
User.where(User[:name].eq('Lush'), User[:id].gt(5)).all
method(:lush_users_found)
end
@dev_ton](https://image.slidesharecdn.com/crampwebsockets-100629222851-phpapp01/85/Cramp-websockets-26-320.jpg)
Cramp websockets
- 1. Encheção de linguiça :D @dev_ton
- 2. Olá! @dev_ton
- 3. eu Antônio Roberto ( ton ) e você @dev_ton
- 4. 2009 @dev_ton
- 5. @dev_ton
- 6. Leroy eu @dev_ton
- 7. @dev_ton
- 8. @dev_ton
- 9. apoio @dev_ton
- 10. Introdução ao CRAMP e WebSockets apoio @dev_ton
- 11. CRAMP @dev_ton
- 12. CRAMP - O que é? - Quando usar? @dev_ton
- 13. CRAMP Controller & Model @dev_ton
- 14. CRAMP Cramp::Controller Os 4 estágios após uma requisição: Initialization Response Initialization Starting Finishing @dev_ton
- 16. CRAMP Cramp::Controller on_start class Hello < Cramp::Controller::Action on_start :say_hello def say_hello render "Hello World! :)" finish end end @dev_ton
- 17. CRAMP Cramp::Controller before_start before_start :valid_param def valid_user if param[:id] =~ /[^a-zA-Z](.*)/ yield else halt 500, {'Content-Type' => 'text/plain'}, "Invalid ID" end end @dev_ton
- 18. CRAMP Cramp::Controller on_finish class PollUserAction < Cramp::Controller::Action on_start :start_polling on_finish :stop_polling def start_polling # Call find_user every 10 seconds @timer = EventMachine::PeriodicTimer.new(2) { find_user } end def find_user User.first {|u| render "#{u.inspect}n" } end def stop_polling puts "Cancelling the timer.." @timer.cancel end end @dev_ton
- 19. CRAMP Cramp::Controller periodic_timer class PollUserAction < Cramp::Controller::Action periodic_timer :poll_user, :every => 2 def poll_user User.first {|u| render "#{u.inspect}n" } end end @dev_ton
- 20. CRAMP Cramp::Controller keep_connection_alive class PollUserAction < Cramp::Controller::Action periodic_timer :poll_user, :every => 2 keep_connection_alive, :every => 30 end @dev_ton
- 21. CRAMP Cramp::Controller respond_with def respond_with content_type = params[:format] == 'xml' ? 'application/xml' : 'application/json' [200, {'Content-Type' => content_type}] end @dev_ton
- 22. CRAMP Cramp::Controller request_limit_exceeded class PollUserAction < Cramp::Controller::Action periodic_timer :poll_user, :every => 2 periodic_timer :check_limit_exceed, :every => 10 def poll_user .. end def check_limit_exceed finish if request_limit_exceeded end end @dev_ton
- 23. CRAMP Cramp::Model @dev_ton
- 24. CRAMP Cramp::Model :( @dev_ton
- 25. CRAMP Cramp::Model Cramp::Model.init(:username => 'root', :database => 'cramp_development') class User < Cramp::Model::Base attribute :id, :type => Integer, :primary_key => true attribute :name validates_presence_of :name end @dev_ton
- 26. CRAMP Cramp::Model EM.run do User.select(:id, :name).limit(10).offset(20).first {|u| .. } User.where(User[:name].eq('Lush')).limit(2).all {|users| ... } User.each {|user| .. } def lush_users_found(users) ... end User.where(User[:name].eq('Lush'), User[:id].gt(5)).all method(:lush_users_found) end @dev_ton
- 27. CRAMP Cramp::Model EM.run do def user_saved(status) if status.success? ... else user = status.record puts "Oops. Found errors : #{status.record.errors.inspect}" end end user = User.new user.save method(:user_saved) end @dev_ton
- 28. WebSocket @dev_ton
- 29. WebSocket A mágica! @dev_ton
- 30. WebSocket 4 passos var location = 'http://localhost:8080/backend'; var socket = new WebSocket(location); socket.onopen = function(data) { ... }; socket.onmessage = function(data) {... }; socket.onclose = function(data) { ... }; socket.send(data); https://gist.github.com/98c8448ba054b7992aff#file_example.js @dev_ton
- 31. WebSocket & CRAMP @dev_ton
- 32. WebSocket & CRAMP Cramp::Controller::Websocket Cramp::Controller::Websocket.backend = :thin on_data @dev_ton
- 33. WebSocket & CRAMP on_data Cramp::Controller::Websocket.backend = :thin class WelcomeController < Cramp::Controller::Websocket on_data :received_data def received_data(data) render "Got your #{data}" end end https://gist.github.com/d04affd72e2ea57039eb @dev_ton
- 34. Ajax & WebSockets @dev_ton
- 35. DEMO :D @dev_ton
- 36. Obrigado! :) email: [email protected] twitter: @dev_ton
- 37. links Indrodução ao CRAMP & WebSockets ( patrik ) http://m.onkey.org/2010/1/7/introducing-cramp http://m.onkey.org/2010/1/15/websockets-made-easy-with-cramp WebSockets API http://dev.w3.org/html5/websockets/ Video ( pubsubhubbub ) http://www.youtube.com/watch?v=B5kHx0rGkec App Apresentação http://github.com/devton/socketchat @dev_ton
- 38. Obrigado! @dev_ton