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
Scala初心者は◯◯◯にメソッドを生やしたいと考えた / Pre-ScalaMatsuri ...
Search
集約のエンティティ
August 30, 2020
Programming
3
2.6k
Scala初心者は◯◯◯にメソッドを生やしたいと考えた / Pre-ScalaMatsuri 2020
2020年8月30日に開催されたプレScalaMatsuriのLightning Talk発表資料です
https://scalaconfjp.doorkeeper.jp/events/110045
集約のエンティティ
August 30, 2020
Tweet
Share
More Decks by 集約のエンティティ
See All by 集約のエンティティ
組織を強くするPdMのマインド / PMHub vol.2
pictiny
4
750
戦略的DDDは重いのか? / Is strategic DDD heavy?
pictiny
4
2.8k
戦略的DDDを実践するための跳躍力 / OOC 2024
pictiny
9
9.6k
どうしてこうなった命名集 ~🔥編~ / OOC 2024 LT
pictiny
7
4.8k
おかしな名前 ~ 🔥編 ~ / Strange Name
pictiny
1
300
ドローンの会社は生成AIをどう活用するか / Generative AI Bounenkai 2023
pictiny
0
420
日報には"今日の一番大きな成果"を書こう / Kichijoji.pm 34
pictiny
1
1.1k
Scalaの現場から学ぶ設計:座談会 / genba sekkei vol 2
pictiny
0
640
Scalaの現場から学ぶ設計 告知 / genba sekkei vol.2 announce
pictiny
1
170
Other Decks in Programming
See All in Programming
REALITY コマンド作成チュートリアル
nishiuriraku
0
110
AIコーディングエージェントを 「使いこなす」ための実践知と現在地 in ログラス / How to Use AI Coding Agent in Loglass
rkaga
4
640
ComposeでのPicture in Picture
takathemax
0
110
Building Scalable Mobile Projects: Fast Builds, High Reusability and Clear Ownership
cyrilmottier
2
300
The Nature of Complexity in John Ousterhout’s Philosophy of Software Design
philipschwarz
PRO
0
130
PHPで書いたAPIをGoに書き換えてみた 〜パフォーマンス改善の可能性を探る実験レポート〜
koguuum
0
170
The Evolution of the CRuby Build System
kateinoigakukun
0
720
Lambda(Python)の リファクタリングが好きなんです
komakichi
3
220
On-the-fly Suggestions of Rewriting Method Deprecations
ohbarye
1
3.2k
小田原でみんなで一句詠みたいな #phpcon_odawara
stefafafan
0
350
リアルタイムレイトレーシング + ニューラルレンダリング簡単紹介 / Real-Time Ray Tracing & Neural Rendering: A Quick Introduction (2025)
shocker_0x15
1
310
監視 やばい
syossan27
11
9.9k
Featured
See All Featured
Optimising Largest Contentful Paint
csswizardry
36
3.2k
Improving Core Web Vitals using Speculation Rules API
sergeychernyshev
13
680
The Power of CSS Pseudo Elements
geoffreycrofte
75
5.8k
Designing Dashboards & Data Visualisations in Web Apps
destraynor
231
53k
The Cost Of JavaScript in 2023
addyosmani
49
7.7k
Site-Speed That Sticks
csswizardry
5
500
Building Adaptive Systems
keathley
41
2.5k
How to Think Like a Performance Engineer
csswizardry
23
1.5k
Understanding Cognitive Biases in Performance Measurement
bluesmoon
29
1.6k
Rebuilding a faster, lazier Slack
samanthasiow
80
8.9k
How STYLIGHT went responsive
nonsquared
99
5.5k
Code Review Best Practice
trishagee
67
18k
Transcript
!QJDUJOZ 1SF4DBMB.BUTVSJ -JHIUOJOH5BML 4DBMBॳ৺ऀ ̋̋̋ʹϝιουΛ ੜ͍ͨ͠ͱߟ͑ͨ
2020.08.30 2
2020.08.30 3 4DBMBະܦݧͰΞϧϓೖࣾ 4DBMBྺ
2020.02.16 4 ςΫϊϩδʔͷྗͰ اۀͷܦࡁ׆ಈΛ ࢧ͑ɺ֦ு͢Δɻ
2020.08.30 5 ʮαϒεΫϦϓγϣϯϏδωεʹ͓͚Δ શۀΛҰؾ௨؏ͰΧόʔʯ ɾϓϥΠγϯά ɾཧ ɾސ٬ཧ ɾܖཧ ɾٻॻͷൃߦˍૹ ɾΫϨδοτΧʔυܾࡁ
ɾ֤छσʔλੳ ɾ༁ొɺձܭॲཧ ɹɹɹɹɹɹɹɹɹɹɹetc…
2020.02.16 6
2020.02.16 7 %%%
2020.08.30 8 Ξϧϓɺ%%%ͬͯΔΑ ɹɹɹɹɹɹɹαϒεΫϦϓγϣϯྖҬͷ4BB4 ෳࡶ͕ඇৗʹߴ͍ ͦͷͨΊ։ൃॳظ͔Β%%%Λಋೖ શࣾతʹ࣮ફ
2020.08.30 9 ͔͜͜Βࠓͷ ˞ίʔυαϯϓϧͰ͢
2020.08.30 10 ར༻υϝΠϯ ٻରͱͳΔར༻ظؒΛநԽͨ͠ར༻ΦϒδΣΫτ 70 case class Availability ( startAt:
LocalDate, // ར༻։࢝ endAt: LocalDate, // ར༻ऴྃ billingDate: LocalDate, // ٻ status: AvailabilityStatus // εςʔλε )
2020.08.30 11 ྫɿܞଳճઢͷܖ ֤݄ͷར༻͝ͱʹٻ͕ൃੜ͢Δ ܖͰճઢΛܖ͢Δͱɺϲ݄ͷར༻͕ੜ͡Δ ٻ͕ྃ͢Δͱରͷར༻ͷঢ়ଶ͕ ʮະٻʯ͔ΒʮٻࡁΈʯʹͳΔ
2020.08.30 12 ܖυϝΠϯ ܖΛநԽͨ͠ܖΦϒδΣΫτ &OUJUZ ར༻Λෳ࣋ͭ case class Contract (
id: ContractId, // ܖID availabilities: Seq[Availability], // ར༻ status: ContractStatus, // εςʔλε pricing: …, // ྉۚઃఆ … )
2020.08.30 13 ະٻͷར༻ΛٻΊΔ ར༻ͷεςʔλε͕ະٻͳͷ case class Contract (…) { def
unBilledAvailabilities: Seq[Availability] = availabilities.filter(_.status = UnBilled) // ະٻͷར༻ }
2020.08.30 14 ࣍ճͷٻΛٻΊΔ ະٻͷར༻ͷ͏ͪɺٻ͕࠷͍ۙͷ case class Contract (…) { def
nextBillingDate(today: LocalDate): LocalDate = availabilities.filter(_.status = UnBilled) // ະٻͷར༻Ͱ .filter(_.billingDate > today) // ٻ͕ࠓΑΓະདྷͰ .minBy(_.billingDate.toEpochDay) // ٻ͕࠷աڈͷͷ .billingDate }
2020.08.30 15 ࠓٻ͢Δར༻ΛٻΊΔ ະٻͷར༻ͷ͏ͪɺٻ͕ࠓͷͷ case class Contract (…) { def
shouldCreateBilling(today: LocalDate): Seq[Availability] = availabilities.filter(_.status = UnBilled) // ະٻͷར༻Ͱ .filter(_.billingDate = today) // ٻ͕ࠓ }
2020.08.30 16
2020.08.30 17 ͍ͭಉ͡pMUFSͯ͠ͳ͍ʁ
2020.08.30 18 ϦϑΝΫλ ར༻͕ܖʹ͔͠ొ͠ͳ͍ͳΒ͜ΕͰ͍͍͕ʜ case class Contract (…) { def
unBilledAvailabilities: Seq[Availability] = availabilities.filter(_.status = UnBilled) // ະٻͷར༻ def nextBillingDate(today: Localdate): LocalDate = unBilledAvailabilities .filter(_.billingDate > today) // ٻ͕ࠓΑΓະདྷͰ .minBy(_.billingDate.toEpochDay) // ٻ͕࠷աڈͷͷ .billingDate }
2020.08.30 19 ٻΛൃੜͤ͞Δ ٻίϯςΩετͰར༻Λ৮ͬͨΓ͢Δ case class Billing(…) object Billing {
def createBilling(today: LocalDate, contract: Contract): Billing = { val availabilities = contract.shouldCreateBilling(today) val billing = ??? // TODO: ར༻ΛͬͯٻΛ࡞Δ } }
2020.08.30 20 ͱ͍͏Θ͚Ͱ
2020.08.30 21 4FRʹϝιουΛੜ͍ͨ͠
!QJDUJOZ 1SF4DBMB.BUTVSJ -JHIUOJOH5BML 4DBMBॳ৺ऀ ̋̋̋ʹϝιουΛ ੜ͍ͨ͠ͱߟ͑ͨ
!QJDUJOZ 1SF4DBMB.BUTVSJ -JHIUOJOH5BML 4DBMBॳ৺ऀ ̋̋̋ʹϝιουΛ ੜ͍ͨ͠ͱߟ͑ͨ Seq
2020.08.30 24 4FRʹϝιουΛੜ͍ͨ͠ ҙຯΛ࣋ͬͨίϨΫγϣϯૢ࡞ʹ໋໊͍ͨ͠ ϩδοΫͷݟ௨͠ΛΑ͍ͨ͘͠ *%&ͷίʔυิΛޮ͔͍ͤͨ
2020.08.30 25 ʮͦΕJNQMJDJUͰͰ͖ΔΑʯ
2020.08.30 26 ☺
2020.08.30 27 ʮ͓͢͢Ί͠ͳ͍͚Ͳʯ
2020.08.30 28
2020.08.30 29 JNQMJDJU 4FRʹϝιουΛੜͤΔ͕ʜ ఆٛ͢Δॴ͕͍͠ υϝΠϯʁ Ͳ͜Ͱఆٛ͞Ε͍ͯΔ͔ ݺͼग़͠ଆ͔Β Θ͔Γʹ͍͘
υϝΠϯࣝJNQMJDJUͨ͘͠ͳ͍
2020.08.30 30 ͡Ό͋Ͳ͏͢Δ͔
2020.08.30 31 υϝΠϯࣝܕʹ͠Α͏
2020.08.30 32 ར༻ͷίϨΫγϣϯΦϒδΣΫτԽ ܖར༻ίϨΫγϣϯΦϒδΣΫτΛ࣋ͭΑ͏ʹͳΔ case class Availabilities( values: Seq[Availability] )
case class Contract ( id: ContractId, availabilities: Availabilities, // ίϨΫγϣϯΦϒδΣΫτΛ࣋ͭ status: ContractStatus, pricing: …, )
2020.08.30 33 ະٻͷར༻ΛٻΊΔ ར༻ͷυϝΠϯࣝͱ࣮ͯ͠Ͱ͖Δ case class Availabilities (…) { def
unBilledAvailabilities: Availabilities = Availabilities(availabilities.filter(_.status = UnBilled)) }
2020.08.30 34 ٻΛൃੜͤ͞Δ ར༻ίϨΫγϣϯܕΛૢ࡞͢ΕΑ͘ͳΔ case class Billing(…) object Billing {
def createBilling(today: LocalDate, contract: Contract): Billing = { val availabilities: Availabilities = contract.shouldCreateBilling(today) // AvailabilitesܕΛฦ͢ val billing = ??? // TODO: ར༻ΛͬͯٻΛ࡞Δ } }
2020.08.30 35 ίϨΫγϣϯΦϒδΣΫτͷར ϝιου͕ੜͤΔ ܕͷදݱྗ͕͑Δ ϦϑΝΫλ͍͢͠ 'JOE6TBHFͰӨڹൣғ͕Θ͔Γ͍͢
2020.08.30 36 5JQT ඪ४తͳૢ࡞USBJUͰܧঝͰ͖ΔΑ͏ʹ͓ͯ͘͠ͱศར trait class CustomCollection[A] { val values:
Seq[A] def isEmpty: Boolean = values.isEmpty def nonEmpty: Boolean = values.nonEmpty def length: Boolean = values.length … }
2020.08.30 37 ؾ͖ 4FRʹϝιουΛੜ͍ͨ͠ͱߟ͑ͨ Ͱɺ4FRʹϝιουΛੜ͢ͷ͋͘·Ͱखஈ ͳͥͦ͏ߟ͑ͨͷ͔ɺཧ༝ΛݴޠԽ͢Δ͜ͱ͕େࣄ ผͷखஈͰత͕ୡͰ͖Δ͜ͱ͋Δ
2020.08.30 38 ·ͱΊ 4FRʹϝιουΛੜͨ͘͠ͳͬͨ ίϨΫγϣϯ͕υϝΠϯϩδοΫΛ࣋ͭ͜ͱ͕͋Δ υϝΠϯϩδοΫΛ࣋ͭͷܕͱͯ͠ఆٛ͢Δͷ͕Α͍ *%&ͷԸܙେ͖͍
2020.08.30 39 4DBMBΤϯδχΞ࠾༻த
2020.08.30 40