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
The advantage of using ’Eff’ in Scala Project
Search
machu
June 28, 2019
Programming
2
13k
The advantage of using ’Eff’ in Scala Project
machu
June 28, 2019
Tweet
Share
More Decks by machu
See All by machu
NBAチームから学ぶ強いチームの作り方
machuz
0
46
Authorization to implement with Extensible Effect
machuz
0
420
アルプの 認証/認可分離戦略と手法
machuz
3
750
AuthzCtx - Alp社内共有会
machuz
0
76
アルプのEff独自エフェクト集 / Alp-original ’Eff’ pearls
machuz
1
2.1k
Scalebaseバックエンド構成について/the backend design of Scalebase
machuz
0
6.4k
SQL Meisterへの道 ~更新編~ / sql-meister-CUD
machuz
0
2.3k
SQL Meisterへの道 ~基礎〜参照編~ / sql-meister-R
machuz
0
2.6k
Authz
machuz
0
310
Other Decks in Programming
See All in Programming
Putting The Genie in the Bottle - A Crash Course on running LLMs on Android
iurysza
0
140
Processing Gem ベースの、2D レトロゲームエンジンの開発
tokujiros
2
120
意外と簡単!?フロントエンドでパスキー認証を実現する WebAuthn
teamlab
PRO
2
720
@Environment(\.keyPath)那么好我不允许你们不知道! / atEnvironment keyPath is so good and you should know it!
lovee
0
110
「手軽で便利」に潜む罠。 Popover API を WCAG 2.2の視点で安全に使うには
taitotnk
0
830
Deep Dive into Kotlin Flow
jmatsu
1
310
パッケージ設計の黒魔術/Kyoto.go#63
lufia
3
430
機能追加とリーダー業務の類似性
rinchoku
2
1.2k
MCPとデザインシステムに立脚したデザインと実装の融合
yukukotani
4
1.4k
AIコーディングAgentとの向き合い方
eycjur
0
270
請來的 AI Agent 同事們在寫程式時,怎麼用 pytest 去除各種幻想與盲點
keitheis
0
110
実用的なGOCACHEPROG実装をするために / golang.tokyo #40
mazrean
1
250
Featured
See All Featured
Optimizing for Happiness
mojombo
379
70k
Java REST API Framework Comparison - PWX 2021
mraible
33
8.8k
CSS Pre-Processors: Stylus, Less & Sass
bermonpainter
358
30k
Writing Fast Ruby
sferik
628
62k
How to Create Impact in a Changing Tech Landscape [PerfNow 2023]
tammyeverts
53
2.9k
The Cult of Friendly URLs
andyhume
79
6.6k
Save Time (by Creating Custom Rails Generators)
garrettdimon
PRO
32
1.5k
4 Signs Your Business is Dying
shpigford
184
22k
Testing 201, or: Great Expectations
jmmastey
45
7.6k
What's in a price? How to price your products and services
michaelherold
246
12k
10 Git Anti Patterns You Should be Aware of
lemiorhan
PRO
656
61k
Evolution of real-time – Irina Nazarova, EuRuKo, 2024
irinanazarova
8
920
Transcript
The advantage of using ’Eff’ in Scala Project Scala Matsuri
2019 @ma2k8 4DBMBϓϩδΣΫτͰ&⒎Λ༻͢Δར
About Me ▶Tsubasa Matsukawa - SWE&SRE at Recruit Marketing Partners
Co.,Ltd. & Quipper Co.,Ltd. @wing_007 ϦΫϧʔτϚʔέςΟϯάύʔτφʔζ݉2VJQQFSॴଐͰ 48&ͱ43&ྖҬΛ୲͍ͯ͠·͢ɻ
Our Products ▶Study Sapuri English - English learning app [
Web/iOS/Android ] ओʹελσΟαϓϦ&OHMJTIͷ։ൃΛ͍ͯ͠·͢ɻ ӳޠֶशʹڵຯ͕͋Δํੋඇ
Scala has an elegant syntactic sugar ‘for expression’. To make
the most of this force…. 4DBMBʹૉఢͳҥߏจGPS͕ࣜ͋Γ·͢ɻ ͦͷྗΛ࠷େݶར༻͢ΔͨΊʹɾɾɾ
We needed to decided which ‘types’ to primarily use to
when starting Scala projects. ࢲୡ4DBMBͷϓϩδΣΫτΛ։࢝͢ΔࡍɺओʹͲͷʮܕʯΛ ༻͢Δͷ͔ΛܾΊΔඞཁ͕͋Γ·͢ɻ
These ‘types’ are often chosen. ▶Future[A] ▶Future[Try[A]] ▶Future[E Either A]
▶EitherT[Future, E, A] ※There is also case that uses "Task" instead of "Future" ͜ͷΑ͏ͳܕ͕Α͘બΕΔͰ͠ΐ͏ɻ 'VUVSFͷΘΓʹ5BTLΛ͏͜ͱ͋Γ·͢
Our team is trying…. Eff[R, A] ࢲୡͷνʔϜͰ&⒎Λࢼ͍ͯ͠·͢
Each pros and cons were…? ͦΕͧΕͷϝϦοτσϝϦοτʁ
Future[A]
▶ Easy ॴ؆୯͞ʹਚ͖·͢ɻ Pros of Future[A]
Cons of Future[A] ▶ Rough error handling. ▶ Semaphore hard.
※Task solve Semaphore problem. ॴηϚϑΥͷ੍ޚ͕͍͠ͱɺ ΤϥʔϋϯυϦϯά͕େࡶʹ͔͠ߦ͑ͳ͍Ͱ͢ɻ
Future[Try[A]] ɹ
Pros of Future[Try[A]] ▶ Error handling is possible. ॴΤϥʔϋϯυϦϯά͕ՄೳʹͳΔͰ͢ɻ
Cons of Future[Try[A]] ▶ Only throwable can be used ▶
Syntax is not simple(Coding 'try ~ catch' every time is very troublesome. ॴΤϥʔϋϯυϦϯάʹ༻Ͱ͖Δܕ͕ 5ISPXBCMFʹݶΔͱγϯλοΫε͕ෳࡶʹͳΔͰ͢ɻ
Personally, I often use ‘Try’ when wrapping Java libraries, but
since I convert to ‘Either’, they do not appear in signatures. ݸਓతʹ5SZ+BWBϥΠϒϥϦͷ8SBQͰΑ͍͘·͕͢ɺ &JUIFSܕʹม͠ɺγάχνϟʹग़͠·ͤΜɻ
Future[E Either A]
Pros of Future[E Either A] ▶ Flexible Error handling is
possible. ▶ E is ADT can be flexible expression. ▶ Every time force error handling. ॴ5SZΑΓॊೈͳΤϥʔϋϯυϦϯά͕ ՄೳʹͳΔͰ͢ɻ
Cons of Future[E Either A] ▶ Rough error handling. ▶
Every time need to match the type even if you don't need error handling. ॴΤϥʔϋϯυϦϯά͕ ෆཁͳՕॴͰܕ߹Θ͕ͤඞཁʹͳΔͰ͢ɻ
EitherT[Future, E, A]
Pros of EitherT[Future, E, A] ▶ Can solve part of
the complexity of nesting. ॴ͋Δఔωετͯ͠ GPSࣜΛγϯϓϧʹอͯΔͰ͢ɻ
Cons of EitherT[Future, E, A] ▶ It gets slower as
types are stacked. ▶ May change results in evaluation order. ▶ Too many lift. ॴɺධՁॱͰ݁Ռ͕มΘΔՄೳੑ͕͋ΓɺϞφυ ελοΫʹ٧Ήܕ͕૿͑Δͱɺܕ߹Θ͕ͤࡶʹͳΔͰ͢ɻ
Eff[R, A]
Pros of Eff[R, A] ▶ ‘Eff’ can solve other ‘types’
disadvantage. ▶ Simple syntax. ▶ Can simply use various effects. ▶ Can solved performance problem when types are stacked. ▶ A result doesn't change for the order of evaluation. &⒎͜Ε·Ͱհͨ͠ܕͷσϝϦοτͷ େ෦ΛղফͰ͖·͢ɻ
Cons of Eff[R, A] ▶’Eff’ is very simple syntax. But
not easy. ▶ difficult effects wire. ▶ Anything is lazy evaluation. ▶ Complexity of type specification. &⒎ͷσϝϦοτɺ؆୯Ͱͳ͍Ͱ͢ɻ ͋Δఔͷ׳ΕඞཁͰ͠ΐ͏ɻ
Our project used ‘Eff’ on clean architecture. զʑͷϓϩδΣΫτͰɺ$MFBO"SDIJUFDUVSFͰઃܭ͠ɺ Ҿ͖ճ͢ܕʹ&⒎Λ༻͢ΔߏΛಋೖ͍ͯ͠·͢ɻ
͜ͷΑ͏ʹෳͷޮՌΛϑϥοτʹهड़Ͱ͖ΔͷͰɺ γϯϓϧʹهड़Ͱ͖͍ͯ·͢ɻ
How to use ‘Eff’ &⒎ͷ͍ํ Library: https://github.com/atnos-org/eff
Define ADT "%5Λఆٛ͠·͢ɻ
Define Smart-constructer "%5Λ&⒎ʹੵΉεϚʔτίϯετϥΫλΛఆٛ͠·͢ɻ
ੵΜͩ"%5Λղऍ͢ΔΠϯλϓϦλΛఆٛ͠·͢ɻ Define Interpreter
Ready to use ‘Eff’. ͜ΕͰ&⒎Λར༻͢Δ४උ͕Ͱ͖·ͨ͠ɻ
&⒎Λར༻ͨ͠ϓϩάϥϜΛॻ͖·͢ɻ Write program!!
ΠϯλϓϦλʹ͔͚ͯ&⒎Λ࣮ߦ͠·͢ɻ SVO99ͷؔͦΕͧΕJNQMJDJUDPOWFSTJPOͰੜͯ͠·͢ɻ Run program!!
‘Eff’ is Good! &⒎͍͍ͧʂʢհهࣄͱίʔυαϯϓϧష͓͖ͬͯ·͢ Introduction article: https://tech.recruit-mp.co.jp/server-side/post-18728/ɹ Code sample: https://github.com/ma2k8/eff-arch-example
Thanks! ͋Γ͕ͱ͏͍͟͝·ͨ͠ʂ