Elixir otp-basics
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This document provides an overview of OTP (Open Telecom Platform) concepts in Elixir. It discusses processes, behaviours like GenServer and Supervisor, and how they help build robust applications. Process supervision trees are shown to illustrate how processes can be organized hierarchically. An example calculator application is used to demonstrate evolving a basic script into a module, then implementing GenServer and Supervisor behaviours to integrate it with OTP. This provides message passing, naming, and fault tolerance. The talk concludes that OTP is easy to implement and the behaviours handle difficult tasks, making distributed, concurrent applications robust.
Elixir otp-basics
- 2. Agenda – OTP – Concepts – OTP Basics ● GenServer ● Supervisor ● Application – Case EcCart – Summary
- 3. Elixir – OTP ● OTP stands for Open Telecom Platform. ● Is a general purpose tool for developing and managing large systems. ● Provides tools, libraries, conventions and defines a structure for your application.
- 4. Elixir – About OTP ● Features included in Erlang/Elixir/OTP: – Erlang interpreter and compiler – Standard libraries – Dialyzer, a static analysis tool – Mnesia, a distributed database – Erlang Term Storage (ETS) – A debugger – An event tracer – A release management tool (hot swap)
- 5. Elixir – Concepts ● Process – Fundamental part of concurrency – Are light weight – Doesn’t share memory – Implemented using tail recursion Taken from: http://learnyousomeerlang.com/event-handlers
- 6. Elixir – Concepts ● Process
- 7. Elixir – Concepts ● Process (recap spawn, spawn_link )
- 8. Elixir – Concepts ● Behaviours – Code that implements a common pattern. – OTP provides: ● GenServer ● Supervisor ● Application
- 9. Elixir – About OTP Sup
- 10. Elixir – About OTP Sup SubSup
- 11. Elixir – About OTP Sup SubSup Worker
- 12. Elixir – About OTP Sup SubSup Worker SubSupSup
- 13. Elixir – About OTP Sup SubSup Worker SubSubSup Worker
- 14. Elixir – About OTP Sup SubSup Worker SubSubSup Worker Worker Worker Worker
- 15. Elixir – About OTP ● Erlang implements Actor model – Actor can communicate with others by messages. – Actor encapsulates the state. – When and Actor is processing messages, the actor can designate a new state.
- 16. Elixir – OTP case ● Use a calculator of example of how can evolve on a basic OTP architecture.
- 17. Elixir – Script Calculator
- 18. Elixir – Script Calculator ● Issues – Doesn’t maintain state – No communicaton with other processes
- 19. Elixir – Module Calculator
- 20. Elixir – Module Calculator ● Maintain state ● Communication with other processes ● What is missing? – Message Box – Naming – Distribution – Concurrency – Fault Tolerance/recovery
- 21. Elixir – GenServer ● Provides callback functions ● Manage inbox messages ● Alias registration ● Integration with OTP behaviours
- 23. Elixir – GenServer Calculator
- 24. Elixir – Supervisor Calculator
- 25. Elixir – Application Calculator
- 26. Elixir – Summary • OTP is easy to implement. ● OTP behaviours has been battle tested for years. ● The behaviours on OTP makes hard tasks really easy.
- 27. Elixir – EcCart ● https://hex.pm/packages/ec_cart
- 28. References ● NY: Manning Publications. ● Thomas, D. (2016). Programming Elixir 1.3: functional, concurrent, pragmatic, fun. Releigh, NC: Pragmatic Bookshelf. ● Tan Wei Hao, B.(2017). The little Elixir & OTP Guidebook. Shelter Island, NY: Manning Publications.