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ࠓ೔ͦ͜ཧղ͢Δ Hotม׵ @ࣾ಺RxSwiftษڧձ

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https://speakerdeck.com/ukitaka/cold-at-she-nei-rxswiftmian-qiang-hui લճͷଓ͖

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Hotม׵

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Cold → Hot

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(෮श)Hotʹؔ࿈͢ΔΦϖϨʔλ Hotʹؔ࿈͢ΔΦϖϨʔλ͸ҎԼͷΈɻ ͜ΕΒ͕ಛʹݺ͹Εͯͳ͚Ε͹Hotʹม׵͞ΕΔ͜ͱ΋ͳ͍ɻ • multicast / publish • replay / replayAll • connect / refCount • share / shareReplay • shareReplayLatestWhileConnected

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·͊ͱΓ͋͑ͣ࢖ͬͯΈΔ͔

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publish()

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Question1 ͳΜͱදࣔ͞ΕΔͰ͠ΐ͏ʁ

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No content

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͜Μͳͷ؆୯͡ΌΜʂ 1,2,3Ͱ͠ΐʂ

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͜Μͳͷ؆୯͡ΌΜ Sequence Map Hot subscribe Քಇ

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͜Μͳͷ؆୯͡ΌΜ Sequence Map Hot subscribe Քಇ

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Answer ਖ਼ղ͸…

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A. ͳʹ΋දࣔ͞Εͳ͍

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!?

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(෮श)Hotʹؔ࿈͢ΔΦϖϨʔλ Hotʹؔ࿈͢ΔΦϖϨʔλ͸ҎԼͷΈɻ ͜ΕΒ͕ಛʹݺ͹Εͯͳ͚Ε͹Hotʹม׵͞ΕΔ͜ͱ΋ͳ͍ɻ • multicast / publish • replay / replayAll • connect / refCount • share / shareReplay • shareReplayLatestWhileConnected ؚΈͷ͋Δݴ͍ํ

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Hotม׵ ϙΠϯτͦͷ1 ConnectableObservable

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ͭ͡͸publish()ͷฦΓ஋…

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ConnectableObservable • connect() ϝιουΛ࣋ͭ • connect() ΛݺͿ͜ͱͰHotʹม׵׬ྃ͢Δ • connect() ΛݺͿ·ͰObserver͕͍Α͏͕͍ ·͍͕ಈ࡞͠ͳ͍

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ConnectableObservable

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ͳΜͰඞཁͳͷʁ • ྫ͑͹ɺෳ਺ͷobserver͕Hotม׵͞Εͨετ ϦʔϜͷ஋Λ࠷ॳ͔ΒͪΌΜͱड͚औΓ͍ͨ ࣌ɻconnect()ΛݺͿ·Ͱಈ࡞͠ͳ͍ͷͰɺͦ ͷؒʹશͯͷobserverΛsubscribe͓ͤͯ͘͞ ͜ͱ͕Ͱ͖Δɻ

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ͳΜͰඞཁͳͷʁ (ConnectableObservable͕ແ͍ͱͲ͏ͳΔ͔͸ߟ͑ͯΈ͍ͯͩ͘͞)

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ConnectableObservableΛฦ͢Operator • multicast() • publish() • replay(bufferSize:) • replayAll()

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multicast() • ͦ΋ͦ΋Hotม׵ͱ͸ɺ಺෦తʹSubjectΛར ༻͍ͯ͠Δ͚ͩͰ͋Δɻ • multicast()͸SubjectΛࢦఆͯͦ͜͠ͰҰ୴Π ϕϯτΛड͚ΔΑ͏ʹ͢ΔOperator

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multicast()

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publish() • PublishSubjectʹmulticast͢Δ

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• ReplaySubjectʹmulticast͢Δ replay(bufferSize:) / replayAll()

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ConnectableObservable·ͱΊ • ColdͳObservableʹରͯ͠ɺmulticast() / publish() / replay(bufferSize:) / replayAll() Λݺͼ ग़͢͜ͱͰ ConnectableObservableʹม׵Ͱ͖ Δɻ • ConnectableObservableʹରͯ͠connect()Λݺͼ ग़͢͜ͱͰHotͳObservableʹม׵͕׬ྃ͢Δɻ

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࣍΁…

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ConnectableObservable ཧղͨ͠

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ଞͷHotؔ࿈ͷOperator͸ʁ

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(෮श)Hotʹؔ࿈͢ΔΦϖϨʔλ Hotʹؔ࿈͢ΔΦϖϨʔλ͸ҎԼͷΈɻ ͜ΕΒ͕ಛʹݺ͹Εͯͳ͚Ε͹Hotʹม׵͞ΕΔ͜ͱ΋ͳ͍ɻ • multicast / publish • replay / replayAll • connect / refCount • share / shareReplay • shareReplayLatestWhileConnected

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ͱΓ͋͑ͣshare()Ͱ΋ ࢖ͬͯΈΔ͔

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share() ConnectableObservable͡Όͳͯ͘ ObservableͰฦ͖ͬͯͯΔ͠ ͖ͬͱHot΍Ζʂʂʂ

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Question2 ͳΜͱදࣔ͞ΕΔͰ͠ΐ͏ʁ

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No content

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Answer ਖ਼ղ͸…

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A. ͳʹ΋දࣔ͞Εͳ͍

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ƅЧƅ)Űō?

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Hotม׵ ϙΠϯτͦͷ2 ۂऀ: RefCount

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share()

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refCount() • refCount() ͸ ConnectableObservableʹର͠ ͯݺ΂Δ΋͏ҰͭͷOperatorͰ͋Δɻ

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refCount() • Hotͷ֓೦Λ෴͢ΊΜͲ͍͘͞ศརͳ΍ͭ • Hotͷੑ࣭ͱͯ͠ʮsubscribe͠ͳͯ͘΋ಈ࡞ ͢Δʯͱ͍͏ͷ͕͋Δ͕ɺrefCount͕ڬ·Δ ͱʮHot͕ͩɺ࠷ॳʹsubscribe͞ΕΔ·Ͱಈ ࡞͠ͳ͍ʯΈ͍ͨͳڍಈʹͳΔɻ

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refCount() • ࡞Γ͸୯७Ͱɺ࠷ॳʹsubscribe͞Εͨ࣌఺Ͱ ಺෦తʹconnect()ΛݺͿɻ

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Question3 ͳΜͱදࣔ͞ΕΔͰ͠ΐ͏ʁ

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No content

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Answer ਖ਼ղ͸…

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A. 1,2,3

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ͪΌΜͱHotม׵͞Εͯͨ (ͳΜͰʁʂͱࢥͬͨํ͸લճͷεϥΠυ΋ΈͯΈ·͠ΐ͏)

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࢒ΓͷOperator

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shareReplay(bufferSize:) • ໊લͷ௨Γɺshare + replay • share = publish + refCount • shareReplay = publish + refCount + replay • ʮHot͕ͩɺ࠷ॳʹsubscribe͞ΕΔ·Ͱಈ࡞͠ͳ ͍ʯΛकΓͭͭࢦఆ͞Εͨݸ਺͚ͩ஋Λreplay͢ Δ

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shareReplay(bufferSize:) • ࣮͸ΊͬͪΌॏཁͰɺRxSwiftͷExampleͰ΋Α͘ʢʁʣ࢖ ΘΕ͍ͯΔɻ • ม਺తʹѻ͍ͭͭɺ࠶ܭࢉͤ͞ͳ͍Α͏ʹ͢Δͱ͖ʹ shareReplay(1)Λ͚ͭΔͱΑ͍ (͜Εʹ͍ͭͯ͸ผ్ൃද͠ ·͢ɻ) • RxSwift v2.5.0࣌఺Ͱ͸shareReplayʹ1Ҏ֎Λ౉͢ͱ࠶ܭࢉ ͕૸Δόάʁ࢓༷ʁ͕͋Δɻshare΋ಉ༷ͷݱ৅༗Γɻ

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shareReplayLatestWhileConnected() • ໊લ͕ΊͬͪΌ௕͍ • ͜Μͳͷ࢖͏ػձ͋Δͷʁͱࢥ͏͔΋͠Εͳ͍͕ɺ RxSwift(RxCocoa)Ͱఏڙ͞Ε͍ͯΔ Driver͸σϑΥϧτͰ͜Εͱಉ ͡ڍಈΛ͢ΔɻͳͷͰڍಈ͸ཧղ͓ͯ͘͠΂͖ɻ • ShareReplay1 ͱͷҧ͍͸ɺconnect தͰͳ͍ͱ࠷ޙͷ஋͕औΕͳ͍ ͜ͱɻͭ·Γ1౓ .Completed ͕ྲྀΕͨΒͦͷ͋ͱʹ͸replay͞Ε ͣɺ.Completed ͔͠ྲྀΕͯ͜ͳ͍ɻ • ڍಈͷৄࡉͳྫ͸Driverͷͱ͖ʹઆ໌͢ΔͷͰ͜͜Ͱ͸ׂѪɻ

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Hotม׵·ͱΊ Hotʹม׵͢Δʹ͸ • ConnectableObservableʹม׵ޙɺconnect() ΛݺͿ • RefCountʹରͯ͠1ͭҎ্subscribeΛߦ͏

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Ҏ্ʂʂ