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Elixir完全に理解した
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さっちゃん
September 05, 2018
Programming
0
820
Elixir完全に理解した
(完全に理解したとは言っていない)。解説的。
さっちゃん
September 05, 2018
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Transcript
Elixir完全に理解した
.。oO(さっちゃんですよヾ(〃l _ l)ノ゙✩)
2018/06/16
@ 秋葉原 東京
Erlang & Elixir Fest 2018
劃期的なグラフ現る
經驗
經驗 自信
經驗 自信 Elixir完全に理解した
經驗 自信 Elixir完全に理解した Elixir全然わからん
經驗 自信 Elixir完全に理解した Elixir全然わからん Elixirチョットデキル
Elixir完全に理解した
Erlang & Elixirで世界は、 チャットサーバーを作り(LINE、LoL - Riot Games、Discord、enza)、 大量メール配信システムを作り(ユミルリンク)、 ニコ生を作り、 課金APIサーバーを作り(gumi)、
廣告APIサーバーを作り (Dreevee)、 〜を作り…
Elixirを皆さんは、 完全に理解する。
Process Functional Macro
Process Functional Macro
Processes are parallel.
Task 1 Task 2 t Task 1 Task 2 t
t Non-parallel (just concurrent) Parallel
Parallel computation has multiple timelines. Each processes has independent timelines.
How processes work. send/2 register/2 monitor/1
How processes work. send/2 register/2 monitor/1
send(宛て先, message) Process Process pid send(pid, msg) msg VM
How processes work. send/2 register/2 monitor/1
Process.register(pid, process_name) Process Process pid send(name, msg) msg VM Registry
name → pid register(name, pid)
Erlang (Elixir) <> Go
VM Proc Proc go channel go channel Erlang uses 宛て先
Go uses channel
How processes work. send/2 register/2 monitor/1
Process.monitor(pid | process_name) Process monitor(pid) Process {:DOWN, process} VM monitor
Process Process VM dead
Process.link(pid | process_name) Process link(pid) Process exit VM monitor Process
Process VM dead monitor
Process.link(pid | process_name) Process link(pid) Process exit VM monitor Process
Process VM monitor dead
(Parallel + send/2 + register/2 + monitor/1) makes ↓ GenServer
(Easy process), Supervisor (Easy monitor), :gen_event (Event handler manager), :gen_statem (State machine process), :gen_tcp (Async TCP I/O), Task (Easy background & parallel task), Agent (Easy state), GenStage (Parallel workflow), Flow (Easy GenStage), Registry (Distributed process registry), :rpc (Call remote node with no-border)
Process Functional Macro
Functional programming (函數型programming)
Ruby JavaScript C++, Objective C, Swift C# are not (or
partially) functional.
Programming languages that built on functional programming : Lisp (Emacs
Lisp, Common Lisp, Scheme, Racket, Clojure…) ML (SML, OCaml, F#…) Markov algorithm (Pure, Mathematica…) Proof assistant (Coq, Agda, Idris, F*…) Concatenative (Joy, Factor, Kitten, …) Haskell, PureScript, Erlang, Scala, Lazy K, Elm, APL/J…
Programming languages that built on functional programming : Lisp (Emacs
Lisp, Common Lisp, Scheme, Racket, Clojure…) ML (SML, OCaml, F#…) Markov algorithm (Pure, Mathematica…) Proof assistant (Coq, Agda, Idris, F*…) Concatenative (Joy, Factor, Kitten, …) Haskell, PureScript, Erlang, Scala, Lazy K, Elm, APL/J…
Recipe of Elixir : Clojure Erlang Ruby Elixir
Recipe of Elixir : Build Clojure (Lisp on JVM) in
Ruby form on top of Erlang.
Elixir is functional. Higher-order function Immutable data No implicit state
(except process & macro)
Elixir is functional. Higher-order function : Enum.map(1..42, &(&1 + 1))
Elixir is functional. Immutable data : data = update_in(data.a.b, &(&1
|| 42))
Elixir is functional. No implicit state (except process & macro)
: def get(key, state), do: {state[key], state}
Elixir is functional. Strong abstraction mechanism (See Haskell). Good debuggability.
Good testability.
※Column Debugging tools for Elixir : :observer :observer_cli (3rd party)
ReconTrace (3rd party wrapper of official :dbg) :fprof :eflame (3rd party)
Process Functional Macro
Recipe of Elixir : Build Clojure (Lisp on JVM) in
Ruby form on top of Erlang.
Clojure & Ruby has nice meta-programming mechanism. Elixir has macro.
Macro is a function which convert a program to a
program.
Use Case : GenServer To reduce boilerplate codes. defmodule Example
do use GenServer End GenServer.start_link(Example, nil)
Use Case : Ecto To write declarative code (DSL). defmodule
User do use Ecto.Schema schema “user” do field :name, :string, default: “ももんが” end end
Use Case : with_context (in our product) Implicit programming. card
= with_context(context, get_card!(1)) ↑ {card, context} = get_card!(1, context) card
Elixir has Parallel process Functional Productive macro
Erlang & Elixir’s ecosystem : Web application (Phoenix, Ecto, Quantum)
Bot (Hedwig) Web browser frontend (ElixirScript, Elchemy) IoT (Nerves, GRiSP) BlockChain (æternity) 3D modeling (Wings 3D) Message Queue (RabbitMQ, VerneMQ) DB (Riak, LeoFS)
Elixir完全に理解した