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
今日こそ理解するHot変換@社内RxSwift勉強会
Search
ukitaka
July 18, 2016
Programming
4
810
今日こそ理解するHot変換@社内RxSwift勉強会
今日こそ理解するHot変換
ukitaka
July 18, 2016
Tweet
Share
More Decks by ukitaka
See All by ukitaka
CSの生産性改善を支える分析環境 Mercari CS/CRE Tech Talk #1
ukitaka
1
2.5k
switchのexhaustiveness/redundancy チェック 理論と実装 わいわいswiftc #8 @ukitaka
ukitaka
0
170
SwiftのDemanglerを書く @ わいわいswiftc番外編
ukitaka
0
400
Swiftの型システムに入門する - iOSDC Japan 2018
ukitaka
10
3.8k
Responder Chainを使って コードをスッキリさせたい - 第1回 HAKATA.swift
ukitaka
6
1.3k
理論から入門するswift/lib/Sema - わいわいswiftc #1
ukitaka
5
1.5k
Realmの処理を再利用可能かつ合成可能にする
ukitaka
0
860
マルチスレッドRxSwift @ 社内RxSwift勉強会
ukitaka
5
1.1k
今日こそ理解するHot / Cold @社内RxSwift勉強会
ukitaka
14
2.5k
Other Decks in Programming
See All in Programming
Xcode 16のPreviewModifierと@Previewableを活用した効率的なプレビュー方法の考察
ojun9
2
160
SDCon2024: Enabling DevOps and Team Topologies thru architecture: architecting for fast flow
cer
PRO
0
780
日付と正規化
megmogmog1965
0
140
I/O Extended Android in Korea 2024 ~ Whats new in Android development tools
pluu
0
250
3 Effective Rules for Success with Signals in Angular
manfredsteyer
PRO
0
120
Product Management LT会_クアンド新家
shinshin
0
210
大規模マルチテナントを解決するYugabyteDBという選択肢
nnaka2992
1
250
CSC307 Lecture 07
javiergs
PRO
0
220
CSC307 Lecture 14
javiergs
PRO
0
220
Folding Cheat Sheet #7
philipschwarz
PRO
0
150
コード生成を伴うLLMエージェント - 2024.07.18 Tokyo AI
smiyawaki0820
11
4.1k
Terraformテスト入門
msato
0
520
Featured
See All Featured
個人開発の失敗を避けるイケてる考え方 / tips for indie hackers
panda_program
78
15k
In The Pink: A Labor of Love
frogandcode
139
22k
Templates, Plugins, & Blocks: Oh My! Creating the theme that thinks of everything
marktimemedia
23
1.9k
A designer walks into a library…
pauljervisheath
201
24k
Ruby is Unlike a Banana
tanoku
96
10k
Why Our Code Smells
bkeepers
PRO
332
56k
Optimizing for Happiness
mojombo
373
69k
Making Projects Easy
brettharned
111
5.7k
Build The Right Thing And Hit Your Dates
maggiecrowley
28
2.2k
Reflections from 52 weeks, 52 projects
jeffersonlam
346
19k
CSS Pre-Processors: Stylus, Less & Sass
bermonpainter
353
29k
Sharpening the Axe: The Primacy of Toolmaking
bcantrill
26
1.6k
Transcript
ࠓͦ͜ཧղ͢Δ Hotม @ࣾRxSwiftษڧձ
https://speakerdeck.com/ukitaka/cold-at-she-nei-rxswiftmian-qiang-hui લճͷଓ͖
Hotม
Cold → Hot
(෮श)Hotʹؔ࿈͢ΔΦϖϨʔλ Hotʹؔ࿈͢ΔΦϖϨʔλҎԼͷΈɻ ͜ΕΒ͕ಛʹݺΕͯͳ͚ΕHotʹม͞ΕΔ͜ͱͳ͍ɻ • multicast / publish • replay /
replayAll • connect / refCount • share / shareReplay • shareReplayLatestWhileConnected
·͊ͱΓ͋͑ͣͬͯΈΔ͔
publish()
Question1 ͳΜͱදࣔ͞ΕΔͰ͠ΐ͏ʁ
None
͜Μͳͷ؆୯͡ΌΜʂ 1,2,3Ͱ͠ΐʂ
͜Μͳͷ؆୯͡ΌΜ Sequence Map Hot subscribe Քಇ
͜Μͳͷ؆୯͡ΌΜ Sequence Map Hot subscribe Քಇ
Answer ਖ਼ղ…
A. ͳʹදࣔ͞Εͳ͍
!?
(෮श)Hotʹؔ࿈͢ΔΦϖϨʔλ Hotʹؔ࿈͢ΔΦϖϨʔλҎԼͷΈɻ ͜ΕΒ͕ಛʹݺΕͯͳ͚ΕHotʹม͞ΕΔ͜ͱͳ͍ɻ • multicast / publish • replay /
replayAll • connect / refCount • share / shareReplay • shareReplayLatestWhileConnected ؚΈͷ͋Δݴ͍ํ
Hotม ϙΠϯτͦͷ1 ConnectableObservable
ͭ͡publish()ͷฦΓ…
ConnectableObservable • connect() ϝιουΛ࣋ͭ • connect() ΛݺͿ͜ͱͰHotʹมྃ͢Δ • connect() ΛݺͿ·ͰObserver͕͍Α͏͕͍
·͍͕ಈ࡞͠ͳ͍
ConnectableObservable
ͳΜͰඞཁͳͷʁ • ྫ͑ɺෳͷobserver͕Hotม͞Εͨετ ϦʔϜͷΛ࠷ॳ͔ΒͪΌΜͱड͚औΓ͍ͨ ࣌ɻconnect()ΛݺͿ·Ͱಈ࡞͠ͳ͍ͷͰɺͦ ͷؒʹશͯͷobserverΛsubscribe͓ͤͯ͘͞ ͜ͱ͕Ͱ͖Δɻ
ͳΜͰඞཁͳͷʁ (ConnectableObservable͕ແ͍ͱͲ͏ͳΔ͔ߟ͑ͯΈ͍ͯͩ͘͞)
ConnectableObservableΛฦ͢Operator • multicast() • publish() • replay(bufferSize:) • replayAll()
multicast() • ͦͦHotมͱɺ෦తʹSubjectΛར ༻͍ͯ͠Δ͚ͩͰ͋Δɻ • multicast()SubjectΛࢦఆͯͦ͜͠ͰҰ୴Π ϕϯτΛड͚ΔΑ͏ʹ͢ΔOperator
multicast()
publish() • PublishSubjectʹmulticast͢Δ
• ReplaySubjectʹmulticast͢Δ replay(bufferSize:) / replayAll()
ConnectableObservable·ͱΊ • ColdͳObservableʹରͯ͠ɺmulticast() / publish() / replay(bufferSize:) / replayAll() Λݺͼ
ग़͢͜ͱͰ ConnectableObservableʹมͰ͖ Δɻ • ConnectableObservableʹରͯ͠connect()Λݺͼ ग़͢͜ͱͰHotͳObservableʹม͕ྃ͢Δɻ
࣍…
ConnectableObservable ཧղͨ͠
ଞͷHotؔ࿈ͷOperatorʁ
(෮श)Hotʹؔ࿈͢ΔΦϖϨʔλ Hotʹؔ࿈͢ΔΦϖϨʔλҎԼͷΈɻ ͜ΕΒ͕ಛʹݺΕͯͳ͚ΕHotʹม͞ΕΔ͜ͱͳ͍ɻ • multicast / publish • replay /
replayAll • connect / refCount • share / shareReplay • shareReplayLatestWhileConnected
ͱΓ͋͑ͣshare()Ͱ ͬͯΈΔ͔
share() ConnectableObservable͡Όͳͯ͘ ObservableͰฦ͖ͬͯͯΔ͠ ͖ͬͱHotΖʂʂʂ
Question2 ͳΜͱදࣔ͞ΕΔͰ͠ΐ͏ʁ
None
Answer ਖ਼ղ…
A. ͳʹදࣔ͞Εͳ͍
ƅЧƅ)Űō?
Hotม ϙΠϯτͦͷ2 ۂऀ: RefCount
share()
refCount() • refCount() ConnectableObservableʹର͠ ͯݺΔ͏ҰͭͷOperatorͰ͋Δɻ
refCount() • Hotͷ֓೦Λ෴͢ΊΜͲ͍͘͞ศརͳͭ • Hotͷੑ࣭ͱͯ͠ʮsubscribe͠ͳͯ͘ಈ࡞ ͢Δʯͱ͍͏ͷ͕͋Δ͕ɺrefCount͕ڬ·Δ ͱʮHot͕ͩɺ࠷ॳʹsubscribe͞ΕΔ·Ͱಈ ࡞͠ͳ͍ʯΈ͍ͨͳڍಈʹͳΔɻ
refCount() • ࡞Γ୯७Ͱɺ࠷ॳʹsubscribe͞Εͨ࣌Ͱ ෦తʹconnect()ΛݺͿɻ
Question3 ͳΜͱදࣔ͞ΕΔͰ͠ΐ͏ʁ
None
Answer ਖ਼ղ…
A. 1,2,3
ͪΌΜͱHotม͞Εͯͨ (ͳΜͰʁʂͱࢥͬͨํલճͷεϥΠυΈͯΈ·͠ΐ͏)
ΓͷOperator
shareReplay(bufferSize:) • ໊લͷ௨Γɺshare + replay • share = publish +
refCount • shareReplay = publish + refCount + replay • ʮHot͕ͩɺ࠷ॳʹsubscribe͞ΕΔ·Ͱಈ࡞͠ͳ ͍ʯΛकΓͭͭࢦఆ͞Εͨݸ͚ͩΛreplay͢ Δ
shareReplay(bufferSize:) • ࣮ΊͬͪΌॏཁͰɺRxSwiftͷExampleͰΑ͘ʢʁʣ ΘΕ͍ͯΔɻ • มతʹѻ͍ͭͭɺ࠶ܭࢉͤ͞ͳ͍Α͏ʹ͢Δͱ͖ʹ shareReplay(1)Λ͚ͭΔͱΑ͍ (͜Εʹ͍ͭͯผ్ൃද͠ ·͢ɻ) •
RxSwift v2.5.0࣌ͰshareReplayʹ1Ҏ֎Λ͢ͱ࠶ܭࢉ ͕Δόάʁ༷ʁ͕͋Δɻshareಉ༷ͷݱ༗Γɻ
shareReplayLatestWhileConnected() • ໊લ͕ΊͬͪΌ͍ • ͜Μͳͷ͏ػձ͋Δͷʁͱࢥ͏͔͠Εͳ͍͕ɺ RxSwift(RxCocoa)Ͱఏڙ͞Ε͍ͯΔ DriverσϑΥϧτͰ͜Εͱಉ ͡ڍಈΛ͢ΔɻͳͷͰڍಈཧղ͓͖ͯ͘͠ɻ • ShareReplay1
ͱͷҧ͍ɺconnect தͰͳ͍ͱ࠷ޙͷ͕औΕͳ͍ ͜ͱɻͭ·Γ1 .Completed ͕ྲྀΕͨΒͦͷ͋ͱʹreplay͞Ε ͣɺ.Completed ͔͠ྲྀΕͯ͜ͳ͍ɻ • ڍಈͷৄࡉͳྫDriverͷͱ͖ʹઆ໌͢ΔͷͰ͜͜ͰׂѪɻ
Hotม·ͱΊ Hotʹม͢Δʹ • ConnectableObservableʹมޙɺconnect() ΛݺͿ • RefCountʹରͯ͠1ͭҎ্subscribeΛߦ͏
Ҏ্ʂʂ