Elixir and OTP

The Erlang ecosystem excels at handling concurrent scenarios like the large chat system WhatsApp. Its paradigms based on concurrency differ from your common experience but they will boost your performance and spark your interest after understanding. This talk explains the basic principles of Elixir.

After a brief introduction into Elixir’s syntax, we approach the communication model and then move on to the failure recovery enabled by supervision trees. The talk is concluded by the explanation of hot code swapping.

The corresponding code for the talk can be found on GitHub: https://github.com/philippneugebauer/introduction_elixir_otp

Transcript

1. ELIXIR AND OTP 25.10.2018 Philipp Neugebauer @ppneugebauer ELIXIR MEETUP MÜNCHEN
2. Keep it simple! Philipp Neugebauer
 IT Consultant at INNOQ • Rails/Phoenix • Simple CI/CD • Docker + AWS
3. Erlang VM is THE choice to solve concurrent problems
4. SYNTAX a = [ %{true: 1, false: 2.0 }, {:ok, "success"}, fn x -> x + 1 end ] List.last(a).(1)
5. SYNTAX defmodule Example do def example([]) do [] end def example(list), do: list end
6. Elixir Functional Erlang VM Concurrent Message Passing CHARACTERISTICS
7. Elixir Actor Model Super- vision Trees Hot Code Swaps
8. ACTOR MODEL Actor Queue Actor Queue Message Based on http://java-is-the-new-c.blogspot.de/2014/01/comparision-of-different-concurrency.html
9. COMMUNICATION W W W S S S W …
10. Let it crash!
11. LET IT CRASH W W W W … S S S
12. LET IT CRASH W W W W … :one_for_one S S S
13. LET IT CRASH W2 W3 W1 W … :rest_for_one S S S
14. LET IT CRASH W W W W … :one_for_all S S S
15. LET IT CRASH W W W1 W … Process.link(W1) {:EXIT, from, reason} S S S
16. LET IT CRASH W W W1 W … Process.monitor(W) {:DOWN, ref, :process, object, reason} S S S
17. HOT CODE SWAPPING P {:swap, new_function} loop(function)
18. HOT CODE SWAPPING P loop(new_function)
19. GOOD RESOURCES • learnyousomeerlang.com • Programming Elixir • Articles of Joe Armstrong • Awesome Elixir @ GitHub
20. Summary
21. Message passing Supervision Trees Erlang VM https://github.com/philippneugebauer/introduction_elixir_otp
22. ELIXIR AND OTP 25.10.2018 Philipp Neugebauer @ppneugebauer ELIXIR MEETUP MÜNCHEN