Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Let's create stateful systems, by Elixir
Search
さっちゃん
August 24, 2019
Programming
1
950
Let's create stateful systems, by Elixir
さっちゃん
August 24, 2019
Tweet
Share
More Decks by さっちゃん
See All by さっちゃん
みんなのオブザーバビリティプラットフォームを作ってるんだがパフォーマンスがやばい #mackerelio #srenext
ne_sachirou
0
1.5k
作ってよかったgraceful shutdownライブラリ #kyotogo
ne_sachirou
0
1.3k
path 依存型って何?
ne_sachirou
0
650
野生の onbording と onbording 設計 #kyototechtalk
ne_sachirou
0
630
メトリックはいかにして見え續ける樣になったか #devio2022
ne_sachirou
0
91
名實一致
ne_sachirou
0
670
まかれるあなとみあ ―Mackerel のしくみを理解する 30 分― @ Hatena Engineer Seminar #16
ne_sachirou
0
3.1k
tacit programming : Point-free, Concatenatives & J
ne_sachirou
0
990
Monitoring Containerized Elixir
ne_sachirou
1
980
Other Decks in Programming
See All in Programming
A full stack side project webapp all in Kotlin (KotlinConf 2025)
dankim
0
120
Startups on Rails in Past, Present and Future–Irina Nazarova, RailsConf 2025
irinanazarova
0
110
20250704_教育事業におけるアジャイルなデータ基盤構築
hanon52_
5
790
Deep Dive into ~/.claude/projects
hiragram
14
2.6k
iOS 26にアップデートすると実機でのHot Reloadができない?
umigishiaoi
0
130
NPOでのDevinの活用
codeforeveryone
0
840
git worktree × Claude Code × MCP ~生成AI時代の並列開発フロー~
hisuzuya
1
570
A2A プロトコルを試してみる
azukiazusa1
2
1.4k
Blazing Fast UI Development with Compose Hot Reload (droidcon New York 2025)
zsmb
1
290
AIと”コードの評価関数”を共有する / Share the "code evaluation function" with AI
euglena1215
1
170
Goで作る、開発・CI環境
sin392
0
230
プロダクト志向ってなんなんだろうね
righttouch
PRO
0
190
Featured
See All Featured
Distributed Sagas: A Protocol for Coordinating Microservices
caitiem20
331
22k
Agile that works and the tools we love
rasmusluckow
329
21k
I Don’t Have Time: Getting Over the Fear to Launch Your Podcast
jcasabona
32
2.4k
The Cost Of JavaScript in 2023
addyosmani
51
8.5k
For a Future-Friendly Web
brad_frost
179
9.8k
Code Reviewing Like a Champion
maltzj
524
40k
Building Applications with DynamoDB
mza
95
6.5k
The Invisible Side of Design
smashingmag
301
51k
How GitHub (no longer) Works
holman
314
140k
個人開発の失敗を避けるイケてる考え方 / tips for indie hackers
panda_program
107
19k
XXLCSS - How to scale CSS and keep your sanity
sugarenia
248
1.3M
Gamification - CAS2011
davidbonilla
81
5.4k
Transcript
Let's create stateful systems, by Elixir
. 。oO( さっちゃんですよヾ( 〃l _ l) ノ゙☆)
I'll show you a number.
2
Two
Ⅱ
⼆
2 is a number of collison & collaboration.
I & you hot & ice stand up & lie
down inside & outside
stateless & stateful
Function is stateless. f : x -> y e.g. Web
server
Dialogue is stateful. Alice : X. Bob : Y. Alice
: X. Bob : Z. Most of the system is stateful.
Elixir
Elixir is a functional programming language. Functional programming is stateless.
All data of Elixir is immutable. [x, 3, x] = Enum.map([1,2,1], &(&1 + 1)) assert 2 == x // Many lines that don't reassign to `x`. assert 2 == x
Elixir has processes. 29 = Task.async(fn -> 29 end) |>
Task.await
Process has state. agent = Agent.start_link(fn -> 29 end) 29
= Agent.get(agent, &(&1)) Agent.update(agent, &(&1 + 13)) 42 = Agent.get(agent, &(&1))
State should be updated in a transaction. State shold interact
& isolate each other. Accessing to state should be scaled in-out. Server with state should be updated gracefully. Elixir has all of these!
State should be updated in a transaction. (No shared state)
State shold interact & isolate each other. (Application, Supervisor) Accessing to state should be scaled in-out. (GenStage, Task, Register, Erlang cluster) Server with state should be updated gracefully. (Hot code swap)
We can create stateful system easy, by constructing stateless parts.
How we can start Elixir? Let's create some applications. *
Web application with Phoenix. * Slack bot.
Phoenix is a Web application framework that familiar with WebSocket.
https://hexdocs.pm/phoenix/overview.html
React is available (✿ >ヮ ╹ )-♡ Let's create a
realtime interaction ∩ (> ◡ <*)∩ ♡ https://speakerdeck.com/ne_sachirou/phoenix-livereact
Create a Slack bot. https://github.com/BlakeWilliams/Elixir-Slack (Easy, so no topic.)
Installing Elixir. asdf https://asdf-vm.com/ asdf plugin-add erlang asdf install erlang
22.0.7 asdf plugin-add elixir asdf install elixir 1.9.1
Text editor? VSCode with mjmcloug.vscode-elixir works.
Format & lint. InnerCotton https://github.com/ne-sachirou/inner_cotton is a set of standard
development tools. mix cotton.init mix cotton.lint --fix
Docker image (You need Docker :-) Fix major ver.s both
Erlang & Elixir. docker run -it --rm nesachirou/elixir:1.9_erl22
Textbook & document. Official guide : https://elixir-lang.org/ Official document :
https://hexdocs.pm/elixir/Kernel.html Online textbook : https://elixirschool.com/ja/ Textbook : https://tatsu-zine.com/books/programming-elixir-ja
https://speakerdeck.com/ne_sachirou/elixirwan-quan-nili-jie-sita
Advanced resources
Erlang in Anger https://ymotongpoo.github.io/erlang-in-anger/text-ja.pdf You want to read this… before
production.
https://speakerdeck.com/ne_sachirou/sutetohurudeda-gui-mo- akusesufalsearusoft-realtimenagemusabawoeasynitukuru
https://speakerdeck.com/ne_sachirou/elixir-on-containers
https://speakerdeck.com/ne_sachirou/phoenix-at-scale
https://speakerdeck.com/ne_sachirou/ddd-data-driven-development