Elixir - Exploring actor-based systems

Talk given at PartialConf 2017 in Sofia, Bulgaria

1. ELIXIR Exploring actor-based systems
2. ELIXIR Exploring actor-based systems The good parts
3. THE COMMUNITY
5. MICHAŁ MUSKAŁA http://michal.muskala.eu/ https://github.com/michalmuskala/ @michalmuskala
6. http://omt.tech/ Orther Mulelid-Tynes Technology, Inc.
7. THE MODERN COMPUTING
10. ACTOR MODEL
11. Actor Model Communicating Sequential Processes π-calculus Software Transactional Memory
13. FUNCTIONAL PROGRAMMING
14. • Explicit state • Transformation instead of mutation
15. – José Valim “Functional programming is associated with concurrency but it was not by design. It just happens that, by making the complex parts of our system explicit, solving more complicated issues like concurrency becomes much simpler.”
18. Switch Switch
19. Server Server Browser Endpoints Mobile
21. 2 MILLION CONNECTIONS on a single server https://blog.whatsapp.com/196/1-million- is-so-2011
24. http://www.phoenixframework.org/blog/the-road-to-2-million-websocket-connections
25. ELIXIR CONCURRENT FUNCTIONAL
26. Sequential code
27. Sequential code Functional code
29. x1 = async_func1() x2 = async_func2(x1) x3 = async_func3(x2) x4 = async_func4(x3) x5 = async_func5(x4) x6 = async_func6(x5)
30. async_func1() |> async_func2() |> async_func3() |> async_func4() |> async_func5() |> async_func6()
33. OTP
34. DB Web Mailer Websockets
35. DB Web Mailer Websockets Supervisor
36. Application
39. app1@node1 app1@node2
40. – Joe Armstrong “We do not have ONE web-server handling 2 millions sessions. We have 2 million webservers handling one session each.”
41. GOALS OF ELIXIR
42. THE GOALS OF ELIXIR • COMPATIBILITY • EXTENSIBILITY • PRODUCTIVITY
44. THE GOALS OF ELIXIR • COMPATIBILITY • EXTENSIBILITY • PRODUCTIVITY
45. THE GOALS OF ELIXIR • COMPATIBILITY • EXTENSIBILITY • PRODUCTIVITY • PRODUCTIVITY • MAINTAINABILITY • RELIABILITY
46. COMPATIBILITY
47. https://elixir-lang.org/crash-course.html
48. EXTENSIBILITY
49. defmodule Test do use ExUnit.Case, async: true test "math works" do assert 1 + 2 == 2 end end
51. from w in Weather, where: w.prcp <= 0.0 or is_nil(w.prcp), order_by: w.city, select: w
52. defmacro if(condition, clauses) do optimize_boolean(quote do case unquote(condition) do x when x in [false, nil] -> unquote(else_clause) _ -> unquote(do_clause) end end) end
53. PRODUCTIVITY
58. HEXDOCS • https://hexdocs.pm/elixir/String.html • https://hexdocs.pm/elixir/1.5.0/String.html • https://hexdocs.pm/phoenix/Phoenix.Channel.html • https://hexdocs.pm/phoenix/1.2.0/Phoenix.Channel.html
64. DEMO
65. MAINTAINABILITY
66. RELIABILITY
67. HOW DO I START?
68. elixir-lang.org
71. • http://elixir-lang.org • http://www.erlang.org • http://nerves-project.com • http://www.phoenixframework.org/
72. ELIXIR Exploring actor-based systems