Elixir - Exploring actor-based systems

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ELIXIR Exploring actor-based systems

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ELIXIR Exploring actor-based systems The good parts

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THE COMMUNITY

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MICHAŁ MUSKAŁA http://michal.muskala.eu/ https://github.com/michalmuskala/ @michalmuskala

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http://omt.tech/ Orther Mulelid-Tynes Technology, Inc.

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THE MODERN COMPUTING

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ACTOR MODEL

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Actor Model Communicating Sequential Processes π-calculus Software Transactional Memory

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FUNCTIONAL PROGRAMMING

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• Explicit state • Transformation instead of mutation

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– 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.”

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Switch Switch

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Server Server Browser Endpoints Mobile

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2 MILLION CONNECTIONS on a single server https://blog.whatsapp.com/196/1-million- is-so-2011

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http://www.phoenixframework.org/blog/the-road-to-2-million-websocket-connections

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ELIXIR CONCURRENT FUNCTIONAL

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Sequential code

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Sequential code Functional code

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x1 = async_func1() x2 = async_func2(x1) x3 = async_func3(x2) x4 = async_func4(x3) x5 = async_func5(x4) x6 = async_func6(x5)

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OTP

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DB Web Mailer Websockets

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DB Web Mailer Websockets Supervisor

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Application

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app1@node1 app1@node2

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– Joe Armstrong “We do not have ONE web-server handling 2 millions sessions. We have 2 million webservers handling one session each.”

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GOALS OF ELIXIR

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THE GOALS OF ELIXIR • COMPATIBILITY • EXTENSIBILITY • PRODUCTIVITY

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THE GOALS OF ELIXIR • COMPATIBILITY • EXTENSIBILITY • PRODUCTIVITY

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THE GOALS OF ELIXIR • COMPATIBILITY • EXTENSIBILITY • PRODUCTIVITY • PRODUCTIVITY • MAINTAINABILITY • RELIABILITY

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COMPATIBILITY

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https://elixir-lang.org/crash-course.html

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EXTENSIBILITY

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defmodule Test do use ExUnit.Case, async: true test "math works" do assert 1 + 2 == 2 end end

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from w in Weather, where: w.prcp <= 0.0 or is_nil(w.prcp), order_by: w.city, select: w

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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

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PRODUCTIVITY

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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

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DEMO

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MAINTAINABILITY

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RELIABILITY

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HOW DO I START?

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elixir-lang.org

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• http://elixir-lang.org • http://www.erlang.org • http://nerves-project.com • http://www.phoenixframework.org/