Action Cable allows for two-way communication channels between a Rails application and a client. It uses WebSockets for real-time functionality like live updates. The main features of Rails 5 include Action Cable and an API mode. Action Cable provides full-duplex communication through a persistent connection and lightweight metadata for real-time applications.

1. ActionCable и с чем его едят

2. Main feature
The two star features of Rails 5.0 are as follows:
• Action Cable
• API mode

3. Что еще за ВебСокеты?
Это та крутая тема,
которую чуваки на
Node.js используют?
Я слышал за сокетами
будущее
Full-duplex это в 2
раза круче чем half-
duplex, так ведь? Realtime и Full-
duplex? звучит круто,
добавлю в резюме

4. HTML в древности
Simple, stateless, looks like MVP for WEB

5. Новые потребности
Клиенту нужно часто
отправлять запросы на
сервер
Клиенту нужно часто
получать обновления с
сервера
Streaming
в том числе

6. Other Realtime solutions
Polling
Long-polling
Server-Sent Events

7. Polling
Hey! Hey server! You got any new data? Server? SERVER!.

8. Long-polling

9. Server-Sent Events (SSE)
ActionController::Live

10. How WebSockets Work?
Persistent stateful connection
Lightweight metadata
- upgrade request (652 bytes)
- and no more
Full-duplex communication

11. Caniuseit?

12. Откуда растут ноги

13. Freerider
Rails API, ActionCable, React, MaterialUI

14. Freerider
Game page

15. API overview
Connection
Channel

16. Channels

17. Sending Messages

18. Javascript

19. Code
• 450 LOC of javascript
• 2200 LOC of ruby

20. Other Options
MessageBus Sync ActionController::Live
faye-websocket-
ruby
websocket-rails em-websocket

21. MessageBus
• simple api
• polling, long-polling or streaming
• supports server-server, client-server communication

22. Sync
• update partials with web sockets
• you need manually call sync_update(@user)

23. ActionController::Live
• simple API
• not for IE
• doesn’t work with heroku, unicorn

24. faye-websocket-ruby
• uses Faye for pub/sub
• separate process, no access to rails code
• more work to do

25. websocket-rails
• dead
• integrates well with Rails

26. em-websocket
• looks like faye-websocket-ruby
• updated 2 years ago

27. Конклюжены
• loosing caching, routing, multiplexing, gzipping and
lot more
• good for cases with rapid communication
• simple and fun
• all-in-box
• fast start
• rails integration
• npm-package
• works with heroku
• good prospectives

28. Sources I am thankful for:
1. http://tenderlovemaking.com/2012/07/30/is-it-live.html
2. https://www.sitepoint.com/websockets-in-the-ruby-ecosystem
3. https://www.nateberkopec.com/2015/09/30/action-cable.html
4. http://edgeguides.rubyonrails.org/action_cable_overview.html
5. https://www.sitepoint.com/action-cable-and-websockets-an-in-depth-tutorial
6. https://github.com/websocket-rails/websocket-rails
7. https://github.com/rails/rails/tree/master/actioncable
8. https://github.com/chrismccord/sync
9. https://github.com/SamSaffron/message_bus
10. http://edgeguides.rubyonrails.org/action_cable_overview.html
Author: Oleg Gorbunov
game: http://freerider.herokuapp.com
email: beornborn@gmail.com
linkedin: https://ua.linkedin.com/in/oleggorbunov