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今日こそ理解するHot変換@社内RxSwift勉強会
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ukitaka
July 18, 2016
Programming
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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
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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