Full-duplex cloud app with WebSocket

Slide from my talk "Full-duplex cloud app with WebSocket" at pragma conference 2013(http://pragmamark.org/eventi/pragma-conference-2013/#speakers_hook) about how to create iOS app that communicate in full-duplex way with the cloud (using WebSocket and socket.io)

Code: https://github.com/lukabernardi/RealtimeLocation

Transcript

1. Full-duplex cloud app
   with WebSocket
   

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2. @luka_bernardi
   Luca Bernardi
   

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3. “Everything goes
   through an API, 

   we are functioning 

   with cloud app”
   “Mobile is not Different” https://vimeo.com/61044805
   

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4. Document vs. Stream
   Paradigms
   

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5. Document Paradigm
   Built around request/response 

   paradigm of HTTP
   

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6. Stream Paradigm
   Instantly update your content as things happens
   

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7. What we are going to build
   

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8. Hey, what about old
   good BSD socket?
   

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9. “No App is an island”
   Not suitable for web applications
   

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10. Abstraction
    Wouldn’t be nice to have an 

    event-based layer of abstraction?
    

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11. Abusing HTTP
    Polling
    Long Polling
    Streaming
    

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12. Meet WebSocket
    !
    Independent TCP-based protocol that enables
    bidirectional, message-oriented streaming of text
    and binary data between client and server.
    

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13. Server side
    [JS/Node.js] Socket.io (http://socket.io)
    [Python] Tornado (http://
    www.tornadoweb.org)
    [Ruby] em-websocket (https://
    github.com/igrigorik/em-websocket)
    [Objective-C] RockemSockem (https://
    github.com/joshaber/RockemSockem)
    http://www.pusher.com
    http://www.pubnub.com
    https://www.hydna.com
    Comprehensive of realtime web technologies: https://github.com/leggetter/realtime-web-technologies-guide/blob/master/guide.md
    Self-Hosted Hosted
    

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14. Socket.io
    Socket.io > WebSocket
    Abstract the transport mechanism
    

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15. Event/Message based
    

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16. Heartbeat
    By sending a heartbeat at a predetermined
    interval the client informs the server 

    that it's still there.
    

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17. Rooms
    Partitioning of the connected clients.
    

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18. Show us some code!
    

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19. Server Code
    

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20. Client libraries
    AZSocketIO (https://github.com/pashields/AZSocketIO)
    Socket.IO-objc (https://github.com/pkyeck/socket.IO-objc)
    

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21. Client Code
    

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22. Use Case
    Chat / Messaging
    Real-time geolocation
    Stream of event/news
    Real-time collaboration
    Games
    

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23. Think different
    your API
    Photo by Héctor García (http://www.flickr.com/photos/torek/7109339349/)
    

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24. Question?
    

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