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Elixir - Exploring actor-based systems
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Michał Muskała
September 23, 2017
Programming
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99
Elixir - Exploring actor-based systems
Talk given at PartialConf 2017 in Sofia, Bulgaria
Michał Muskała
September 23, 2017
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Transcript
ELIXIR Exploring actor-based systems
ELIXIR Exploring actor-based systems The good parts
THE COMMUNITY
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MICHAŁ MUSKAŁA http://michal.muskala.eu/ https://github.com/michalmuskala/ @michalmuskala
http://omt.tech/ Orther Mulelid-Tynes Technology, Inc.
THE MODERN COMPUTING
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ACTOR MODEL
Actor Model Communicating Sequential Processes π-calculus Software Transactional Memory
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FUNCTIONAL PROGRAMMING
• Explicit state • Transformation instead of mutation
– 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
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
ELIXIR CONCURRENT FUNCTIONAL
Sequential code
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)
async_func1() |> async_func2() |> async_func3() |> async_func4() |> async_func5() |>
async_func6()
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OTP
DB Web Mailer Websockets
DB Web Mailer Websockets Supervisor
Application
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app1@node1 app1@node2
– Joe Armstrong “We do not have ONE web-server handling
2 millions sessions. We have 2 million webservers handling one session each.”
GOALS OF ELIXIR
THE GOALS OF ELIXIR • COMPATIBILITY • EXTENSIBILITY • PRODUCTIVITY
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THE GOALS OF ELIXIR • COMPATIBILITY • EXTENSIBILITY • PRODUCTIVITY
THE GOALS OF ELIXIR • COMPATIBILITY • EXTENSIBILITY • PRODUCTIVITY
• PRODUCTIVITY • MAINTAINABILITY • RELIABILITY
COMPATIBILITY
https://elixir-lang.org/crash-course.html
EXTENSIBILITY
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
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
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
MAINTAINABILITY
RELIABILITY
HOW DO I START?
elixir-lang.org
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• http://elixir-lang.org • http://www.erlang.org • http://nerves-project.com • http://www.phoenixframework.org/
ELIXIR Exploring actor-based systems
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