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ࠓͦ͜ཧղ͢Δ Hot / Cold @ࣾRxSwiftษڧձ
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RxͰΈͳ࠷ॳʹͭ·ͮ͘ ϙΠϯτ
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Hot / Cold
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Hot / Cold • Hot / Cold Ή͔͍ͣ͠ • Hot / Cold Α͘Θ͔Βͳ͍ • Hot / Cold ཧղͰ͖ͳ͍ • Rxͦ͠͏… Rxා͍…
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ࡾᵆ( ^o^)ᵒ
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ࡾᵆ( ^o^)ᵒ ※ Bondྑ͍ϥΠϒϥϦͰ͢
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͜ͷεϥΠυͰ • جຊతͳ֓೦Λཧղ্ͨ͠ͰɺHot / Cold Ͱ ৺͕ંΕͦ͏ʹͳͬͨํΛλʔήοτʹͯ͠ ΔͷͰɺ͋ΔఔͷRxSwiftͷཧղΛඞཁͱ͠ ·͢ɻ
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͜ͷεϥΠυͰ • ·ͨHotมʹ͍ͭͯ͘ͳΔͷͰผͷػձ ʹઆ໌͠·͢ɻ • ͱΓ͋͑ͣ Hot / Cold ͷੑ࣭ʹͯ͠આ໌ ͠·͢ɻ
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͜ͷεϥΠυͰ • ྫ (ΫΠζ) Λग़͠ͳ͕ΒHot / Cold ͦΕͧΕ ͕ͲΜͳੑ࣭Λ͍࣋ͬͯΔͷ͔֬ೝ͍͖ͯ͠ ·͢ɻ • ·ͩͦΕͧΕͷੑ࣭ҧ͍Λઆ໌͍ͯ͠ͳ͍ ͷͰ͕͢ɺ͋ͱͰઆ໌͘͢͢͠ΔͨΊʹ࠷ ॳʹʮલఏࣝʯͱʮݟ͚ํʯͷϧʔϧΛ આ໌͠·͢ɻ
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લఏࣝ
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લఏࣝ ͦͷ1 Hot / Cold ʮObservableʯͷੑ࣭
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ͳʹΛͨΓલͷࣄΛ ݴ͍ͬͯΔΜͩίΠπ
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͡Ό͋ͳʹ͕Observable͔
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͡Ό͋ͳʹ͕Observable͔ • Subject • PublishSubject, BehaviorSubject, ReplaySubject …
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͡Ό͋ͳʹ͕Observable͔ • Subject • PublishSubject, BehaviorSubject, ReplaySubject … • Operator • map, filter, flatMap … • create, of, just, error …
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͡Ό͋ͳʹ͕Observable͔ • Subject • PublishSubject, BehaviorSubject, ReplaySubject … • Operator ← !? • map, filter, flatMap … • create, of, just, error …
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લఏࣝ ͦͷ2 ֤छOperator (Λද͢Ϋϥε) ʮObservableʯͰ͋Δ
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filter
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filter ฦΓͷܕObservable
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filter ࣮ଶfilter operatorΛද͢ Filterͱ͍͏Ϋϥε
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just
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just ฦΓͷܕObservable
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just ࣮ଶJustͱ͍͏Ϋϥε
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લఏࣝ·ͱΊ • Hot / Cold ʮObservableʯͷੑ࣭ • SubjectʮObservableʯ • Operator (Λද͢Ϋϥε) ʮObservableʯ
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Hot / Cold ͷ ݟ͚ํ
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ݟ͚ํ ͦͷ1 SubjectHotͰ͋Δ
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Subject • PublishSubject • BehaviorSubject • ReplaySubject ͜ΕΒHotͰ͋Δ
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ݟ͚ํ ͦͷ2 ΄ͱΜͲͷOperator ColdͰ͋Δ
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Hotʹؔ࿈͢ΔΦϖϨʔλ Hotʹؔ࿈͢ΔΦϖϨʔλҎԼͷΈɻ ͜ΕΒ͕ಛʹݺΕͯͳ͚ΕHotʹม͞ΕΔ͜ͱͳ͍ɻ • multicast / publish • replay / replayAll • connect / refCount • share / shareReplay • shareReplayLatestWhileConnected
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SubjectͳͷͰHot
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Map OperatorCold
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Filter OperatorCold
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Subject Map Filter ↑ Α͘Έ͔͚Δਤ
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ݟ͚ํ·ͱΊ • Subject Hot • Operator ΄ͱΜͲ͕ Cold • publishͳͲҰ෦ͷOperator Hot (ʹؔ࿈)
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ͰɺHot / Cold ͬͯͳʹʁ
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͓·ͨͤ͠·ͨ͠ Hot / Coldͷੑ࣭
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Question1 ͳΜͱදࣔ͞ΕΔͰ͠ΐ͏ʁ
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Answer ਖ਼ղ…
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A. ͳʹදࣔ͞Εͳ͍
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Coldͷੑ࣭ ͦͷ1 ColdͳObservable subscribe͞ΕΔ·Ͱ ಈ࡞͠ͳ͍
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Coldsubscribe͞ΕΔ·Ͱಈ࡞͠ͳ͍ Sequence
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Coldsubscribe͞ΕΔ·Ͱಈ࡞͠ͳ͍ Sequence Map
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Coldsubscribe͞ΕΔ·Ͱಈ࡞͠ͳ͍ ୭subscribe͍ͯ͠ͳ͍ → ಈ࡞͠ͳ͍
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͡Ό͋subscribeͨ͠Βʁ
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͡Ό͋subscribeͨ͠Βʁ
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Hotͷੑ࣭ ͦͷ1 HotͳObservable subscribe͞Εͳͯ͘ ಈ࡞͢Δ ٯʹ
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Question2 ͳΜͱදࣔ͞ΕΔͰ͠ΐ͏ʁ
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Answer ਖ਼ղ…
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A. ͳʹදࣔ͞Εͳ͍
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ղઆ Subject Map
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ղઆ Subject Map
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• ಈ࡞͠ͳ͍ = ड͚औΔ͜ͱ͢Β͠ͳ͍ Coldsubscribe͞ΕΔ·Ͱಈ࡞͠ͳ͍ Subject Map SubjectΛྲྀ͢ ड͚औΒͳ͍
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Question3 ͳΜͱදࣔ͞ΕΔͰ͠ΐ͏ʁ
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Answer ਖ਼ղ…
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A. 1, 2, 3
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ղઆ Subject Map Hot
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HotલͷColdΛՔಇͤ͞Δ ͱॻ͘ͱͦ͠͏͕ͩɺཁ HotͳObservableதͰsubscribeΛݺΜͰΔ͚ͩɻ Subject Map Hot subscribe Քಇ
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͜͜·Ͱͷ·ͱΊ • Cold ͳObservablesubscribe͞ΕΔ·Ͱಈ࡞͠ͳ͍ • Hot ͳObservablesubscribe͞Εͳͯ͘ಈ࡞͢Δ • Hot ͳObservableલͷCold ΛՔಇͤ͞Δ
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Hot ͷ͏Ұͭେ͖ͳੑ࣭
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Hotͷੑ࣭ ͦͷ2 HotͳObservable ذͰ͖Δ
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Coldͷੑ࣭ ͦͷ2 ColdͳObservable ذͰ͖ͳ͍ ٯʹ
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ذͰ͖Δͱʁ • ذͰ͖Δ = ObserverΛෳ࣋ͯΔ • Cold ͳObservableObserverΛ1͔ͭ࣋ͯ͠ͳ͍ • Hot ͳObservableObserverΛෳ࣋ͯΔ ※ આ໌؆ུԽͷͨΊʹʮObserverʯͱ͍ͯ͠·͕͢ɺͪΖΜ͜͜· ͰͷྫͷΑ͏ʹذޙʹObservableΛͭͳ͛ͯߦ͘͜ͱͰ͖·͢ɻ
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͑ʁෳ࣋ͯͳ͍ͷʁ
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͑ʁෳ࣋ͯͳ͍ͷʁ
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͑ʁෳ࣋ͯͳ͍ͷʁ ͳΜ͔Ͱ͖ͦ͏ͳงғؾ͋Δ͚Ͳʁʁʁ
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Sequence Map
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Sequence Map Observer 1ͭΊ͕subscribe
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Sequence Map Observer Map Observer 2ͭΊsubscribe͍͚ͨ͠Ͳ ͢Ͱʹ1ͭ͞ΕͯΔ…
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Sequence Map Observer Map Observer
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Sequence Map Observer Sequence Map Observer
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Sequence Map Observer Sequence Map Observer ετϦʔϜ͕2ຊʹ !!
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ͦͷ݁ՌͲ͏ͳΔ͔
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ͦͷ݁ՌͲ͏ͳΔ͔
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ͦͷ݁ՌͲ͏ͳΔ͔ Sequence Map Observer Sequence Map Observer 2ετϦʔϜग़ྗ͞ΕΔ
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Hotͷ߹ Hotʹ͢Δ(·ͩಈ࡞͠ͳ͍) (ৄࡉHotมͷͱ͖ʹઆ໌)
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Hotͷ߹
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Hotͷ߹ ͜͜ͰετϦʔϜ։࢝ (ৄࡉHotมͷͱ͖ʹઆ໌)
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Hotͷ߹ Sequence Map Hot
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Hotͷ߹ Sequence Map Hot Observer 1ͭΊ͕subscribe
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Hotͷ߹ Sequence Map Hot Observer Observer 2ͭΊsubscribe
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Hotͷ߹ Sequence Map Observer Hot Observer
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Hotͷ߹ Sequence Map Observer Hot Observer ذ !!!
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ͦͷ݁ՌͲ͏ͳΔ͔
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ͦͷ݁ՌͲ͏ͳΔ͔
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ͦͷ݁ՌͲ͏ͳΔ͔ Sequence Map Observer Hot Observer Ұճ͔͠print͞Εͳ͍
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͜͜·Ͱͷ·ͱΊ • Cold ͳObservableذͰ͖ͳ͍ • Hot ͳObservableذͰ͖Δ
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Hot ͷ࠷ޙͷੑ࣭
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Question4 ͳΜͱදࣔ͞ΕΔͰ͠ΐ͏ʁ
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͜͜ͰετϦʔϜ։࢝ (ৄࡉHotมͷͱ͖ʹઆ໌) Hotʹ͢Δ(·ͩಈ࡞͠ͳ͍)
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Answer ਖ਼ղ…
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A. 2, 4, 6
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͋Εʁ 2ճsubscribeͯ͠Δͷʹʁ
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Hotͷੑ࣭ ͦͷ3 HotͳObservableͷΠϕϯτ ֤ObserverͰڞ༗͞ΕΔ
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͢ΔͱͲ͏ͳΔ͔ • ֤Observerʹରͯ͠ಉ͡Πϕϯτ͕ૹग़͞ΕΔɻͭ· Γͦ͜·ͰͷColdԿݺΕͳ͍ɻ(ذͷੑ࣭ ͱ͜ΖͰ֬ೝࡁΈ) • ͢ͰʹྲྀΕͨΠϕϯτ(Next)ૹग़͞Εͳ͍ɻͭ·Γ ్த͔Βsubscribe͢Δͱ్த͔Β͔͠ड͚औΕͳ͍ɻ
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ղઆ ετϦʔϜՔಇ։࢝࣌Ͱ observer1ͭ
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ղઆ 2,4,6 ͕දࣔ͞ΕΔ
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ղઆ ͜͜ʹࢸͬͨ࣌ͰશͯͷNext͢Ͱʹૹग़ࡁΈɻ ࠶ྲྀΕΔ͜ͱͳ͍ɻ
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ղઆ Αͬͯɺͳʹදࣔ͞Εͳ͍
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ղઆ
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͡Ό͋Coldͷ߹ʁ
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͡Ό͋Coldͷ߹ʁ Sequence Map Observer Sequence Map Observer
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͡Ό͋Coldͷ߹ʁ ͢Ͱʹղઆͨ͠௨ΓɺετϦʔϜࣗମ͕2ͭʹͳΔɻ ͳͷͰɺ྆ํͷObserverͰ࠷ॳͷΠϕϯτ͔Βͯ͢ ड͚औΔ͜ͱ͕Ͱ͖Δɻ Sequence Map Observer Sequence Map Observer
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͡Ό͋Coldͷ߹ʁ
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ੑ࣭·ͱΊ
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Coldͷੑ࣭ ͦͷ1 ColdͳObservable subscribe͞ΕΔ·Ͱ ಈ࡞͠ͳ͍
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Hotͷੑ࣭ ͦͷ1 HotͳObservable subscribe͞Εͳͯ͘ ಈ࡞͢Δ ٯʹ
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Hotͷੑ࣭ ͦͷ2 HotͳObservable ذͰ͖Δ
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Coldͷੑ࣭ ͦͷ2 ColdͳObservable ذͰ͖ͳ͍ ٯʹ
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Hotͷੑ࣭ ͦͷ3 HotͳObservableͷΠϕϯτ ֤ObserverͰڞ༗͞ΕΔ
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Ҏ্ʂ
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࠷ޙʹ • ͜͜·Ͱઆ໌ͨ͠ͷ͋͘·Ͱ֓೦తͳ Ͱ͢ɻͲ͜Ͱͳʹ͕ى͍ͬͯ͜Δ͔ΛͪΌΜ ͱཧղ͢ΔʹɺΓ࣮Λ͕Μͬͯಡ ΜͰ͍ͩ͘͞ɻ(ίʔυϦʔσΟϯάͷצॴ ผ్ൃද͠·͢ɻ) • Hotมʹ͍ͭͯผ్ղઆ͠·͢ɻ