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Stateful Apps with OTP Maciej Kaszubowski
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Realtime Apps with OTP Maciej Kaszubowski
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Background
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Http Server Client
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Architecture Server Mobile Mobile Kurento Mobile Websocket Websocket & REST WebRTC
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Challenges
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Async communication with Kurento
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Async communication with Clients
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Handling Concurrent Calls
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Deploys, migrations & Restarts
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A lot can go wrong
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A lot can go wrong & Errors are dangerous
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How to deal with this?
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init callback
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init callback
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init callback
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init callback
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init callback
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init callback
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Dealing with failures
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RoomServer
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RoomServer
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Let it FAIL
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Room Supervisor RoomServer
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Room Supervisor RoomServer
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Room Supervisor RoomServer
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After the restart, the state is gone
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Room Supervisor BackupServer RoomServer
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Room Supervisor BackupServer RoomServer
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Multiple calls
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Room Supervisor BackupServer RoomServer
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Common Room Supervisor Room Supervisor Backup Server Room Server Room Supervisor Backup Server Room Server
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Common Room Supervisor Room Supervisor Backup Server Room Server Room Supervisor Backup Server Room Server
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Common Room Supervisor Room Supervisor Backup Server Room Server Room Supervisor Backup Server Room Server
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Common Room Supervisor Room Supervisor Backup Server Room Server
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PubSub
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Status Updates Server Mobile Join Mobile Room status
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MyApp.Endpoint.broadcast( “room_id”, “update_status”, status )
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apps/ | |—— domain/ |—— web/
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Status Updates Server Mobile Mobile Subscribe Subscribe
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Status Updates Server Mobile Mobile Join
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Status Updates Server Mobile Mobile Status update Status update
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Status Updates
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Status Updates
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Status Updates
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Status Updates
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Status Updates
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Status Updates
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History
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History Server Call History Subscribe Status update
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History
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History
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History
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Conclusions
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Simpler system
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Testing is easy
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Changes are easy
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Great performance
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We should learn from the Erlang community
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A lot of fun!
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Thanks!