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
モジュールの深さについて / depth of module
Search
nakabonne
January 28, 2019
Technology
0
150
モジュールの深さについて / depth of module
http://nakawatch.hatenablog.com/entry/module-depth
nakabonne
January 28, 2019
Tweet
Share
More Decks by nakabonne
See All by nakabonne
Write an embedded time-series database in Go
nakabonne
1
670
Want to quickly put dbg! into external crates?
nakabonne
0
35
Web API × Clean Architecture / CleanArchitecture Go
nakabonne
3
18k
Other Decks in Technology
See All in Technology
How Community Opened Global Doors
hiroramos4
PRO
1
120
製造業からパッケージ製品まで、あらゆる領域をカバー!生成AIを利用したテストシナリオ生成 / 20250627 Suguru Ishii
shift_evolve
PRO
1
150
Tech-Verse 2025 Global CTO Session
lycorptech_jp
PRO
0
610
「良さそう」と「とても良い」の間には 「良さそうだがホンマか」がたくさんある / 2025.07.01 LLM品質Night
smiyawaki0820
1
350
Fabric + Databricks 2025.6 の最新情報ピックアップ
ryomaru0825
1
150
より良いプロダクトの開発を目指して - 情報を中心としたプロダクト開発 #phpcon #phpcon2025
bengo4com
1
3.1k
PHP開発者のためのSOLID原則再入門 #phpcon / PHP Conference Japan 2025
shogogg
4
890
【PHPカンファレンス 2025】PHPを愛するひとに伝えたい PHPとキャリアの話
tenshoku_draft
0
120
AI導入の理想と現実~コストと浸透〜
oprstchn
0
110
【5分でわかる】セーフィー エンジニア向け会社紹介
safie_recruit
0
26k
Amazon S3標準/ S3 Tables/S3 Express One Zoneを使ったログ分析
shigeruoda
4
570
Oracle Cloud Infrastructure:2025年6月度サービス・アップデート
oracle4engineer
PRO
2
280
Featured
See All Featured
The Psychology of Web Performance [Beyond Tellerrand 2023]
tammyeverts
48
2.8k
Building a Scalable Design System with Sketch
lauravandoore
462
33k
A Tale of Four Properties
chriscoyier
160
23k
Design and Strategy: How to Deal with People Who Don’t "Get" Design
morganepeng
130
19k
The MySQL Ecosystem @ GitHub 2015
samlambert
251
13k
GraphQLとの向き合い方2022年版
quramy
49
14k
Site-Speed That Sticks
csswizardry
10
660
GraphQLの誤解/rethinking-graphql
sonatard
71
11k
Unsuck your backbone
ammeep
671
58k
Evolution of real-time – Irina Nazarova, EuRuKo, 2024
irinanazarova
8
800
jQuery: Nuts, Bolts and Bling
dougneiner
63
7.8k
Typedesign – Prime Four
hannesfritz
42
2.7k
Transcript
Ϟδϡʔϧͷਂ͞ʹ͍ͭͯ CAEC MeetUP #4
Me • தඌ ྋ (@nakabonne) • தԝେֶֶ෦3 • AWAϚΠΫϩαʔϏε •
Go, Envoy, etc…
My tasks https://www.redhat.com/cms/managed-files/service-mesh-1680.png
My tasks https://github.com/DataDog/dd-py-tracing-workshop
Agenda • ྑ͍Ϟδϡʔϧͱ • deep moduleͱ
ྑ͍Ϟδϡʔϧͱ
খ͍͞Ϟδϡʔϧʁ
–The Unix Philosophy “Small is beautiful”
ԿނϞδϡʔϧΛ࡞Δͷ͔
ؔ࿈ੑͷߴ͍ཁૉ͕ू·Δ →࣮ͷෳࡶ͞ΛԼ͛Δ
Open a file in Java FileInputStream fileStream = new FileInputStream(fileName);
BufferedInputStream bufferedStream = new BufferedInputStream(fileStream); ObjectInputStream objectStream = new ObjectInputStream(bufferedStream);
Open a file in Java FileInputStream fileStream = new FileInputStream(fileName);
BufferedInputStream bufferedStream = new BufferedInputStream(fileStream); ObjectInputStream objectStream = new ObjectInputStream(bufferedStream); ॳาతͳI/O
Open a file in Java FileInputStream fileStream = new FileInputStream(fileName);
BufferedInputStream bufferedStream = new BufferedInputStream(fileStream); ObjectInputStream objectStream = new ObjectInputStream(bufferedStream); όοϑΝϦϯά
Open a file in Java FileInputStream fileStream = new FileInputStream(fileName);
BufferedInputStream bufferedStream = new BufferedInputStream(fileStream); ObjectInputStream objectStream = new ObjectInputStream(bufferedStream); read/write
࣮ͷෳࡶ͕͞࿙ΕͯΔ…
• খ͍͞ͱ͍͏͜ͱɺ࣋ͬͯΔใྔ͕গͳ͍ • ࣋ͬͯΔใྔ͕গͳ͍ͱɺ࣮ͷෳࡶ͕͞࿙ Ε͍͢ • ࣮ͷෳࡶ͕͞࿙Ε͍ͯΔͱɺ࣮มߋ͕पΓ ʹӨڹΛ༩͑͘͢ͳΔ
খ͞͞Λҙࣝ͗͢͠Δ
খ͞͞Λҙࣝ͗͢͠Δ
ߴڽूʁૄ݁߹ʁ
ߴڽूʁૄ݁߹ʁ
ߴڽूʁૄ݁߹ʁ ྑ͍ΠϯλʔϑΣʔε͕ඞཁ
ྑ͍ΠϯλʔϑΣʔεͱ
Bad interface
Bad interface
Bad interface
͔͠͠ιϑτΣΞมߋ͞ΕΔ →͜ͷໃ६ͷதͰ่Εͳ͍͜ͱ͕ٻΊΒΕΔ
Good interface ෆมʢՃҎ֎ͷมߋΛڐ͞ͳ͍ʣ
And
͍͋͘͢Δ͖
–Rich Hickey “Easy is relative”
Կ͕ศར͔ϢʔβʔʹΑΔ
Use case Edge case General case
Use case Edge case General case
Ұൠతͳέʔεʹߜͬͯ ͍͢͞Λٻ͢Δ
ෳࡶԽͷཧ༝ FileInputStream fileStream = new FileInputStream(fileName); BufferedInputStream bufferedStream = new
BufferedInputStream(fileStream); ObjectInputStream objectStream = new ObjectInputStream(bufferedStream); όοϑΝϦϯά͠ͳ͍ͱ͍͏ ΤοδέʔεΛڐ༰͍ͯ͠Δ
Good module ؔ࿈ੑͷߴ͍ͨ͘͞ΜͷཁૉΛӅ࣋ͪ͠ɺ ҰൠతͳέʔεͰ͍͘͢ෆมͳΠϯλʔ ϑΣʔεʹΑͬͯڧྗͳػೳΛఏڙ͢Δ
ߟ͑Δ͜ͱଟ͗͢ʂ
ຊ
deep module
A Philosophy of Software Design • ஶऀελϯϑΥʔυେֶ John Ousterhoutڭत •
ઐࢄγεςϜOS ͳͲଟذʹΔ
deep module γϯϓϧͳΠϯλʔϑΣʔεͰ ڧྗͳػೳΛఏڙ͢Δ
deep vs shallow modules
deep vs shallow modules
ΠϯλʔϑΣʔεͷෳࡶ͞ίετͰ ػೳͷڧྗ͞རӹ
ࢹ • ػೳڧྗ͚ͩͲɺͦΕҎ্ʹΠϯλʔ ϑΣʔε͕ෳࡶʹͳͬͯͳ͍͔ʁ • ΠϯλʔϑΣʔε؆୯͚ͩͲɺػೳ ශऑͰͳ͍͔ʁ
ྫɿUnix ϑΝΠϧI/O • open() • read() • write() • close()
• lseek() ←ෆม
Χʔωϧ ϢʔβΞϓϦέʔγϣϯΛ҆ఆͯ͠ ಈ࡞ͤ͞ΔͨΊʹઃܭ͞Ε͍ͯΔ →ࢀߟʹͳΔ
·ͱΊ
·ͱΊ • ྑ͍Ϟδϡʔϧͱʮؔ࿈ੑͷߴ͍ͨ͘͞ΜͷཁૉΛӅ࣋ͪ͠ɺҰൠత ͳέʔεͰ͍͘͢ෆมͳΠϯλʔϑΣʔεʹΑͬͯڧྗͳػೳΛఏ ڙ͢Δͷʯ • ࣮ݱ͢ΔͨΊʹʮϞδϡʔϧͷਂ͞ʯΛҙࣝ͢Δ • ͋͘·ͰҰͭͷߟ͑ํͰ͋ΔͨΊɺΣϧΧϜ
͋Γ͕ͱ͏͍͟͝·ͨ͠