RxSwift / RxJava の基本と実践

by M.Inomata

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RxSwift, RxJavaͷ جຊͱ࣮ફ גࣜձࣾ tech vein ழມ ॆԝ

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ࣗݾ঺հ גࣜձࣾ tech vein ୅ද ழມ ॆԝ (͍ͷ·ͨ ΈͭͻΖ) ձࣾHP: https://www.tech-vein.com/ private twitter: @ino2222

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ݸਓతͳࣗݾ঺հ www.ecoop.net ͱ͍͏αΠτΛ2002೥͔ΒӡӦ͍ͯ͠·͢ɻ GNU Make ͱ͍͏ίϚϯυͷӳޠυΩϡϝϯτΛͻͱΓͰίπίπຊҰ࡭෼຋༁ɺ2002೥ʹެ։ͨ͠Γ͠ ·ͨ͠ɻ ࠓ͸ओʹ iOSΞϓϦ։ൃऀΛ͍ͯ͠·͢ɻ WindowsΞϓϦ։ൃ(2000~2003) → PHP։ൃ/Πϯϑϥӡ༻(2003~2012) ˍ Java։ൃ(ΨϥέʔΞϓϦˍJavaEE)(2005~2010) → AndroidΞϓϦ։ൃ(2010~2013) → iPhone ΞϓϦ։ൃ(2013~) ʴ α AndroidʹະདྷΛײͨ͡2010೥ʹΞϓϦΛॳΊͯެ։͠ɺ௨ࢉ15ສμ΢ϯϩʔυΛୡ੒ʂ …͢Δ΋ɺެ։̍िؒͰߋ৽༻ͷ伴Λ๨ΕͯϝϯςφϯεෆՄೳʹ…ɻ

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ձࣾ(tech vein)ͷ঺հ 2013೥͔Β͋ΔେࡕຊொͷडୗγεςϜ։ൃձࣾͰ͢ɻ Android / iOS εϚʔτϑΥϯΞϓϦ։ൃ΍ɺ WebγεςϜ։ൃ(PHPɾJS)͕ಘҙͰ͢ɻ গਓ਺ͷٕज़తͳ͜ͱɾ໘ന͍͜ͱ͕޷͖ͳϝϯόʔ͕ू·ͬ ͯͰ͖ͨɺখ͞ͳձࣾͰ͢ɻ ձ໊ࣾ͸ςοΫϕΠϯͱಡΈ·͢ɻ

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ࣗࣾެ։தͷAndroid/iOSΞϓϦ ι΢ϧΞϯϦʔγϡ ࣗ෼ͷΦϦΩϟϥΛ࡞ΔεϚϗ31( IUUQTPVOUFDIWFJODPN IUUQTCJUMZ);BV3 $IJJ2 ஍ҬͰॿ͚߹͑Δಗ໊૬ஊΞϓϦ IUUQTBQQMFDP,[IYD ϙέοτΞϒετϥΫτ ҩྍैࣄऀ޲͚ͷ࠷৽δϟʔφϧߪಡΞϓϦ

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ࠓ೔͓࿩͢Δ͜ͱ • RxͷϞνϕʔγϣϯɺخ͍͜͠ͱ • Rx ͷجຊ • εϨουॲཧͱετϦʔϜ݁߹ • (͕࣌ؒ͋Ε͹) Hot / Cold ม׵

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ࠓ೔͓࿩͠ͳ͍͜ͱ(஌ͬͯΔํ޲͚) • Reactive Streams(backPressure ͳͲ)

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͸͡Ίʹ • αϯϓϧίʔυ͸͢΂ͯ RxSwift Ͱॻ͔Ε͍ͯ ·͢ɻ • RxJava ΍ RxJSͰ΋جຊ͸ಉ͡Ͱ͕͢ɺࡉ͔ ͍จ๏ɺਖ਼֬ͳϝιου໊͸ҧ͏͜ͱ͕͋Γ ·͢ɻಉ͡༻్ͷϝιου͕͋ΔͷͰɺ࢖͏ ͱ͖͸ஔ͖׵͑ͯԼ͍͞ɻ

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RxͷϞνϕʔγϣϯ خ͍͜͠ͱ

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RxSwift/RxJavaͱ͸ • ֤ݴޠͰ࣮૷͞Ε͍ͯΔʮRx(Reactive Extension)ʯ  ͷSwift, Java ޲͚ϥΠϒϥϦ • Reactive Extension … ΋ͱ΋ͱ͸  C#.NET Ͱ࢖ΘΕͩͨ͠ Rx.NET ͕ΦϦδφϧ • JavaScript(RxJS), C++(RxCpp), Ruby(Rx.rb), PHP(RxPHP) ͳͲͳͲଟ਺

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Rx=ReactiveXͱ͸Կ͔ʁ ReactiveX = Reactive Extension ൓Ԡతϓϩάϥϛϯά(Reactive Programming)Λ͢ΔͨΊ ͷ֦ுϥΠϒϥϦ(Extensions Library)ͷ͜ͱɻ ReactiveX͸̏ͭͷઃܭࢥ૝Λ૊Έ߹Θͤͯ࡞ΒΕͨϥΠ ϒϥϦͰ͢ɻ - GoF σβΠϯύλʔϯͷ Observable ύλʔϯ - GoF σβΠϯύλʔϯͷ Iterator ύλʔϯ - ؔ਺ܕϓϩάϥϛϯά

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Α͋͘Δύλʔϯ Rx ͳΜ͔Θ͔ΒΜ Rx ͬͯϦεΫ͕͋Γͦ͏ Rx ͜Θ͍

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RxΛͳͥ࢖͏͔ ɾ׳ΕΔͱඇಉظॲཧ͕͔ͳΓָʹͳΔɻ ɾ͓͚֮͑ͯ͹৭ʑͳݴޠɺର৅ʹ࢖͑Δɻ ɾෳࡶͳॲཧͰ΋෭࡞༻Λগͳ͘ॻ͚Δɻ  ɾجຊΛ཈͑Ε͹ҙ֎ͱ؆୯ɻ

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ˣ ͓୊ɿϢʔβ͕ϘλϯΛԡͨ͠Βɺ ɹɹɹඇಉظॲཧ" #Λ଴ͬͯɺ ɹɹɹ݁ՌΛඇಉظॲཧ$ͰՃ޻ͯ͠ɺ ɹɹɹશ෦ͪΌΜͱΤϥʔॲཧΛͯ͠ ɹɹɹ࠷ޙʹ݁ՌΛը໘ʹදࣔͯ͠ཉ͍͠ɻ

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ˣ ͓୊ɿϢʔβ͕ϘλϯΛԡͨ͠Βɺ ɹɹɹඇಉظॲཧ" #Λ଴ͬͯɺ ɹɹɹ݁ՌΛඇಉظॲཧ$ͰՃ޻ͯ͠ɺ ɹɹɹશ෦ͪΌΜͱΤϥʔॲཧΛͯ͠ ɹɹɹ࠷ޙʹ݁ՌΛը໘ʹදࣔͯ͠ཉ͍͠ɻ ˞J043Y4XJGUͷίʔυྫ

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͕͜͜خ͍͠Rx UIΠϕϯτ΍APIɾDBͷඇಉظॲཧͷ࣮ߦ݁ՌͳͲ͋ΒΏΔΠϕϯ τɾσʔλΛ࣌ܥྻσʔλͷετϦʔϜͱͯ͠ॲཧͰ͖Δɻ ಉظతͳɺ஋ɺ഑ྻ͸΋ͪΖΜɺΤϥʔͰ͑͞΋ετϦʔϜͱͯ͠ ѻ͑Δɻ ετϦʔϜࣗମΛΦϒδΣΫτ(Observable)ͱͯ͠ѻ͏͜ͱͰɺෳ ࡶʹͳΓ΍͍͢ඇಉظॲཧ΋ಉظॲཧ΋ಉ͡ΦϒδΣΫτม׵ʹͳ ΓɺγϯϓϧʹͳΔɻ ετϦʔϜΛ࡞ͬͨΓܨ͍ͩΓɺม׵ͨ͠ΓɺՃ޻͢Δศརͳಓ۩ ͕ἧ͍ͬͯΔɻ

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ڵຯͰ͖ͯ·͔ͨ͠ʁ Ͱ͖ͯ·ͨ͠ΑͶʁ

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Rxͷجຊ ·ͣ͸Observable͔Β࢝ΊΑ͏

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Observable → RxͷओཁΫϥε Rx͕࣋ͭ΄ͱΜͲ͢΂ͯͷΫϥε͸Observable ͱͦͷ೿ੜΫϥε(ʴܑఋΫϥε)Ͱ͢ɻ ·ͣ͸ Observable Λ஌Δ͜ͱ͕RxϚελʔ΁ ͷۙಓʹͳΓ·͢ɻ

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Observable ؂ࢹͯ͠σʔλʢΠϕϯτ)Λड͚औΔࣄ͕Ͱ͖ΔΦϒ δΣΫτͰ͢ɻ ॱ൪ʹσʔλɾΠϕϯτ͕ObservableʹྲྀΕΔ͜ͱ͔ ΒɺObservable͸ετϦʔϜ(Stream)ͱ΋ݺͼ·͢ɻ

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“Hello” “Rx” “World” Observable completed ࣌ؒͷྲྀΕ Observable ͸ετϦʔϜ

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͜ͷਤΛʮϚʔϒϧμΠΞάϥϜʯͱ͍͍ɺ ̍ͭͷ໼ҹ͕̍ͭͷετϦʔϜ 0CTFSWBCMF Λද͠·͢ɻ ࠨ͔Βॱ൪ʹΠϕϯτ͕ྲྀΕΔΠϝʔδͰ͢ɻ ̍ͭͷʮ˔ʯ͕̍ͭͷཁૉ͕དྷͨ OFYU ΠϕϯτΛද͠ɺ ʮʛʯ͕ऴྃ DPNQMFUFE ΠϕϯτΛද͠·͢ɻ “Hello” “Rx” “World” Observable completed ࣌ؒͷྲྀΕ

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“Hello” “Rx” “World” Observable completed ࣌ؒͷྲྀΕ ͜ͷਤΛʮϚʔϒϧμΠΞάϥϜʯͱ͍͍ɺ ̍ͭͷ໼ҹ͕̍ͭͷετϦʔϜ 0CTFSWBCMF Λද͠·͢ɻ ࠨ͔Βॱ൪ʹΠϕϯτ͕ྲྀΕΔΠϝʔδͰ͢ɻ ̍ͭͷʮ˔ʯ͕̍ͭͷཁૉ͕དྷͨ OFYU ΠϕϯτΛද͠ɺ ʮʛʯ͕ऴྃ DPNQMFUFE ΠϕϯτΛද͠·͢ɻ ͜ͷσʔλͷྲྀΕ͕ ͭͷετϦʔϜ ʹ̍ͭͷ0CTFSWBCMF

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Observable͸࡞੒ɾม׵Ͱ͖Δ Observable .from([1,2,3,4,5]) .filter { $0 % 2 == 1 } .map { $0 * 2 }

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Observable͸࡞੒ɾม׵Ͱ͖Δ Observable .from([1,2,3,4,5]) .filter { $0 % 2 == 1 } .map { $0 * 2 } < > ഑ྻ͔Β0CTFSWBCMFετϦʔϜΛ࡞Δ 0CTFSWBCMF*OU <*OU> 1 completed 2 3 4 5 ετϦʔϜ࡞੒

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Observable͸࡞੒ɾม׵Ͱ͖Δ Observable .from([1,2,3,4,5]) .filter { $0 % 2 == 1 } .map { $0 * 2 } < > ഑ྻ͔Β0CTFSWBCMFετϦʔϜΛ࡞Δ ح਺͚ͩ࢒͢ϑΟϧλΛ͔͚Δ 0CTFSWBCMF*OU 0CTFSWBCMF*OU <*OU> 1 completed 2 3 4 5 1 completed 3 5 ετϦʔϜม׵

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Observable͸࡞੒ɾม׵Ͱ͖Δ Observable .from([1,2,3,4,5]) .filter { $0 % 2 == 1 } .map { $0 * 2 } < > ഑ྻ͔Β0CTFSWBCMFετϦʔϜΛ࡞Δ ح਺͚ͩ࢒͢ϑΟϧλΛ͔͚Δ ̎ഒͷ஋ʹม׵͢Δ 0CTFSWBCMF*OU 0CTFSWBCMF*OU 0CTFSWBCMF*OU <*OU> 1 completed 2 3 4 5 1 completed 3 5 2 completed 6 10 ετϦʔϜม׵

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subscribe͠ͳ͍ͱετϦʔϜ͸࢝·Βͳ͍ Observable .from([1,2,3,4,5]) < > ഑ྻ͔Β0CTFSWBCMFετϦʔϜΛ࡞Δ 0CTFSWBCMF*OU <*OU> ετϦʔϜͷ࡞੒

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Observable .from([1,2,3,4,5]) < > ഑ྻ͔Β0CTFSWBCMFετϦʔϜΛ࡞Δ 0CTFSWBCMF*OU <*OU> ετϦʔϜ 0CTFSWBCMF Λ ฦ͚͢Ͳʜ subscribe͠ͳ͍ͱετϦʔϜ͸࢝·Βͳ͍

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Observable .from([1,2,3,4,5]) < > ഑ྻ͔Β0CTFSWBCMFετϦʔϜΛ࡞Δ 0CTFSWBCMF*OU <*OU> σʔλ͸ྲྀΕͯ͜ͳ͍ʜ ƅшƅ ŴƅŜŖƃʜ subscribe͠ͳ͍ͱετϦʔϜ͸࢝·Βͳ͍

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Observable .from([1,2,3,4,5]) < > ഑ྻ͔Β0CTFSWBCMFετϦʔϜΛ࡞Δ 0CTFSWBCMF*OU <*OU> .subscribe(onNext: { print(“next: \($0)”) }) ։࢝ͯ͠ॳΊͯඇಉظͰॱ൪ʹσʔλ͕ྲྀΕ·͢ɻ ˞Ұ෦ )PU0CTFSWBCMF Λআ͘ ƅшƅ Űŕ ಥવͷTVCTDSJCFʂ subscribe͠ͳ͍ͱετϦʔϜ͸࢝·Βͳ͍

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subscribeͰετϦʔϜΛ։࢝͢Δ Observable .from([1,2,3,4,5]) < > ഑ྻ͔Β0CTFSWBCMFετϦʔϜΛ࡞Δ 0CTFSWBCMF*OU <*OU> .subscribe(onNext: { print(“next: \($0)”) }) lOFYUz਺஋Λϩάग़ྗ͢Δ ετϦʔϜͷ։࢝ ։࢝ͯ͠ॳΊͯඇಉظͰॱ൪ʹσʔλ͕ྲྀΕ·͢ɻ ˞Ұ෦ )PU0CTFSWBCMF Λআ͘

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subscribeͰετϦʔϜΛ։࢝͢Δ Observable .from([1,2,3,4,5]) < > ഑ྻ͔Β0CTFSWBCMFετϦʔϜΛ࡞Δ 0CTFSWBCMF*OU <*OU> .subscribe(onNext: { print(“next: \($0)”) }) lOFYUz਺஋Λϩάग़ྗ͢Δ ετϦʔϜ͔ΒΠϕϯτ σʔλ ͕ྲྀΕΔ ։࢝ͯ͠ॳΊͯඇಉظͰॱ൪ʹσʔλ͕ྲྀΕ·͢ɻ ˞Ұ෦ )PU0CTFSWBCMF Λআ͘

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subscribeͰετϦʔϜΛ։࢝͢Δ Observable .from([1,2,3,4,5]) < > ഑ྻ͔Β0CTFSWBCMFετϦʔϜΛ࡞Δ 0CTFSWBCMF*OU <*OU> .subscribe(onNext: { print(“next: \($0)”) }) lOFYUz਺஋Λϩάग़ྗ͢Δ ετϦʔϜ͔ΒΠϕϯτ σʔλ Λड͚औΔ ˠlOFYUz Λग़ྗ͢Δɻ ։࢝ͯ͠ॳΊͯඇಉظͰॱ൪ʹσʔλ͕ྲྀΕ·͢ɻ ˞Ұ෦ )PU0CTFSWBCMF Λআ͘

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subscribeͰετϦʔϜΛ։࢝͢Δ Observable .from([1,2,3,4,5]) < > ഑ྻ͔Β0CTFSWBCMFετϦʔϜΛ࡞Δ 0CTFSWBCMF*OU <*OU> .subscribe(onNext: { print(“next: \($0)”) }) lOFYUz਺஋Λϩάग़ྗ͢Δ ˠlOFYUz Λग़ྗ͢Δɻ ετϦʔϜ͔ΒΠϕϯτ σʔλ ͕ྲྀΕΔ ։࢝ͯ͠ॳΊͯඇಉظͰॱ൪ʹσʔλ͕ྲྀΕ·͢ɻ ˞Ұ෦ )PU0CTFSWBCMF Λআ͘

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subscribeͰετϦʔϜΛ։࢝͢Δ Observable .from([1,2,3,4,5]) < > ഑ྻ͔Β0CTFSWBCMFετϦʔϜΛ࡞Δ 0CTFSWBCMF*OU <*OU> .subscribe(onNext: { print(“next: \($0)”) }) lOFYUz਺஋Λϩάग़ྗ͢Δ ˠlOFYUz lOFYUz Λग़ྗ͢Δɻ ετϦʔϜ͔ΒΠϕϯτ σʔλ Λड͚औΔ ։࢝ͯ͠ॳΊͯඇಉظͰॱ൪ʹσʔλ͕ྲྀΕ·͢ɻ ˞Ұ෦ )PU0CTFSWBCMF Λআ͘

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subscribeͰετϦʔϜΛ։࢝͢Δ Observable .from([1,2,3,4,5]) < > ഑ྻ͔Β0CTFSWBCMFετϦʔϜΛ࡞Δ 0CTFSWBCMF*OU <*OU> .subscribe(onNext: { print(“next: \($0)”) }) lOFYUz਺஋Λϩάग़ྗ͢Δ ˠlOFYUz lOFYUz Λग़ྗ͢Δɻ ։࢝ͯ͠ॳΊͯඇಉظͰॱ൪ʹσʔλ͕ྲྀΕ·͢ɻ தུ

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subscribeͰετϦʔϜΛ։࢝͢Δ Observable .from([1,2,3,4,5]) < > ഑ྻ͔Β0CTFSWBCMFετϦʔϜΛ࡞Δ 0CTFSWBCMF*OU <*OU> .subscribe(onNext: { print(“next: \($0)”) }) lOFYUz਺஋Λϩάग़ྗ͢Δ ˠlOFYUz lOFYUz ʜ lOFYUz Λग़ྗ͢Δɻ ։࢝ͯ͠ॳΊͯඇಉظͰॱ൪ʹσʔλ͕ྲྀΕ·͢ɻ

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Q: ετϦʔϜม׵͞Ε͍ͯͨΒ Ͳ͏͍͏ಈ͖ʹ ͳΔͰ͠ΐ͏͔ʁ

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A. ετϦʔϜม׵͞Ε͍ͯͯ΋ɺ subscribeޙͷॲཧͷྲྀΕ͸ ಉ͡Πϝʔδ

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subscribe͢Δ·Ͱ΍ͬͺΓσʔλ͸ྲྀΕͳ͍ Observable .from([1,2,3,4,5]) .filter { $0 % 2 == 1 } .map { $0 * 2 } < > ഑ྻ͔Β0CTFSWBCMFετϦʔϜΛ࡞Δ ح਺͚ͩ࢒͢ϑΟϧλΛ͔͚Δ ̎ഒͷ஋ʹม׵͢Δ 0CTFSWBCMF*OU 0CTFSWBCMF*OU 0CTFSWBCMF*OU <*OU> ੩͔ͩʜ ɾТɾA

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Observable͸ඇಉظʹॱʹσʔλ͕ྲྀΕΔ Observable .from([1,2,3,4,5]) .filter { $0 % 2 == 1 } .map { $0 * 2 } .subscribe(onNext: { print(“next: \($0)”) }) < > ഑ྻ͔Β0CTFSWBCMFετϦʔϜΛ࡞Δ ح਺͚ͩ࢒͢ϑΟϧλΛ͔͚Δ ̎ഒͷ஋ʹม׵͢Δ lOFYUz਺஋Λϩάग़ྗ͢Δ 0CTFSWBCMF*OU 0CTFSWBCMF*OU 0CTFSWBCMF*OU <*OU> ετϦʔϜͷ։࢝

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Observable͸ඇಉظʹॱʹσʔλ͕ྲྀΕΔ Observable .from([1,2,3,4,5]) .filter { $0 % 2 == 1 } .map { $0 * 2 } ˠlOFYUz .subscribe(onNext: { print(“next: \($0)”) }) < > ഑ྻ͔Β0CTFSWBCMFετϦʔϜΛ࡞Δ ح਺͚ͩ࢒͢ϑΟϧλΛ͔͚Δ ̎ഒͷ஋ʹม׵͢Δ lOFYUz਺஋Λϩάग़ྗ͢Δ 0CTFSWBCMF*OU 0CTFSWBCMF*OU 0CTFSWBCMF*OU <*OU> 1 completed 2 3 4 5 1 completed 3 5 Λग़ྗ͢Δɻ 2 completed 6 10

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Observable͸ඇಉظʹॱʹσʔλ͕ྲྀΕΔ Observable .from([1,2,3,4,5]) .filter { $0 % 2 == 1 } .map { $0 * 2 } ˠlOFYUz lOFYUz .subscribe(onNext: { print(“next: \($0)”) }) < > ഑ྻ͔Β0CTFSWBCMFετϦʔϜΛ࡞Δ ح਺͚ͩ࢒͢ϑΟϧλΛ͔͚Δ ̎ഒͷ஋ʹม׵͢Δ lOFYUz਺஋Λϩάग़ྗ͢Δ 0CTFSWBCMF*OU 0CTFSWBCMF*OU 0CTFSWBCMF*OU <*OU> 1 completed 2 3 4 5 1 completed 3 5 Λग़ྗ͢Δɻ 2 completed 6 10

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Observable͸ඇಉظʹॱʹσʔλ͕ྲྀΕΔ Observable .from([1,2,3,4,5]) .filter { $0 % 2 == 1 } .map { $0 * 2 } ˠlOFYUz lOFYUz lOFYUz Λग़ྗ͢Δɻ .subscribe(onNext: { print(“next: \($0)”) }) < > ഑ྻ͔Β0CTFSWBCMFετϦʔϜΛ࡞Δ ح਺͚ͩ࢒͢ϑΟϧλΛ͔͚Δ ̎ഒͷ஋ʹม׵͢Δ lOFYUz਺஋Λϩάग़ྗ͢Δ 0CTFSWBCMF*OU 0CTFSWBCMF*OU 0CTFSWBCMF*OU <*OU> 1 completed 2 3 4 5 1 completed 3 5 2 completed 6 10 தུ

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Observable ͸ subscribeͨ͠Βಈ͖ग़͢ Observable .from([1,2,3,4,5]) .filter { $0 % 2 == 1 } .map { $0 * 2 } .subscribe(onNext: { print(“next: \($0)”) }) 0CTFSWBCMF*OU 0CTFSWBCMF*OU 0CTFSWBCMF*OU <*OU> TVCTDSJCF TVCTDSJCF TVCTDSJCF

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ಈ͖ग़ͨ͠Β্ྲྀ͔ΒԼྲྀʹΠϕϯτ(σʔλ)͕ྲྀ ΕΔ Observable .from([1,2,3,4,5]) .filter { $0 % 2 == 1 } .map { $0 * 2 } .subscribe(onNext: { print(“next: \($0)”) }) 0CTFSWBCMF*OU 0CTFSWBCMF*OU 0CTFSWBCMF*OU <*OU> TVCTDSJCF TVCTDSJCF TVCTDSJCF PO/FYU PO/FYU PO/FYU

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ετϦʔϜʹྲྀΕΔ Πϕϯτͷछྨ

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ετϦʔϜͷΠϕϯτ • next  σʔλ͕ਖ਼͘͠ྲྀΕ͖ͯͨͱ͍͏Πϕϯτɻ೚ҙͷܕͷσʔλΛҾ਺ʹ࣋ ͭɻ • error  ετϦʔϜத͕Τϥʔ(ྫ֎)Ͱҟৗఀࢭͨ࣌͠ʹྲྀΕΔΠϕϯτɻൃੜͨ͠ ΤϥʔΛҾ਺ʹ࣋ͭɻ • completed  ετϦʔϜ͕ਖ਼͘͠׬ྃͨ࣌͠ʹൃੜ͢ΔΠϕϯτɻετϦʔϜͷ࠷ޙʹ Ұ౓͚ͩൃੜ͢Δɻ  ʢೖྗΛ଴ͪଓ͚͍ͨͱ͖͸completedΛྲྀ͞ͳ͍ʣ

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ετϦʔϜͷΠϕϯτ next completed next next next next next completed next next ετϦʔϜ͸ next ͰσʔλΛྲྀ͠ɺDPNQMFUFEͰऴྃ͢Δ DPNQMFUFE͕དྷͨΒɺͦͷઌ͸OFYUFSSPS͸ྲྀΕͳ͍ ྲྀͤͳ͍ next next next FSSPS ྫ֎ ͕དྷͨΒɺͦͷઌ͸OFYUDPNQMFUFEFSSPS͸ྲྀΕͳ͍ ྲྀͤͳ͍ error next next next next next DPNQMFUFE͠ͳ͍ετϦʔϜͰӬٱʹOFYUΛ଴ͪଓ͚Δ͜ͱ΋Ͱ͖Δ next

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Observableͷ·ͱΊ - Observable͸ετϦʔϜ - ԿͰ΋Observableʹ͢Δࣄ͕Ͱ͖Δ - Observable͸ม׵ͯ͠ผͷObservableΛੜ੒͢Δ͜ͱ͕Ͱ ͖Δ - subscribeͰετϦʔϜ͔ΒσʔλΛड͚औΔ - جຊతʹ subscribe ͢Δ·Ͱ͸ετϦʔϜ͕ྲྀΕͳ͍ - subscribeͨ͠Β࿈࠯Ͱඇಉظʹσʔλ͕ྲྀΕग़͢

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Πϕϯτͷ·ͱΊ ObservableͰड͚औΔΠϕϯτ͸ جຊ next, error, completed ͚ͩɻ (ଞʹ͸disposed, subscribedΠϕϯτΛड͚औΕͨΓ͠·͕͢ɺ͋·Γ࢖Θͳ͍Ͱ͢)

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ετϦʔϜ࣮ߦͷऴྃॲཧ (Disposable) ετϦʔϜΛ։࢝(subscribe) ͢Δͱ໭Γ஋ͱͯ͠ Disposable Λฦ͠·͢ɻ Disposableʹରͯ͠dispose()ΛݺͿ͜ͱͰɺඇಉظॲཧͷΩϟ ϯηϧͳͲɺ؂ࢹ͢Δଆͱͯ͠ॲཧΛࢭΊΔࣄ͕Ͱ͖·͢ɻ ྫɿը໘Λดͨ͡Β௨৴Ωϟϯηϧͨ͠Γɺೖྗ଴ͪΛࢭΊͨ Γ͢Δɻ

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Ϣʔβ͔ΒͷϘλϯೖྗΠϕϯτΛ ଴ͪଓ͚Δ0CTFSWBCMF 0CTFSWBCMF*OU Disposableͷ࢖͍ํ %JTQPTBCMF TVCTDSJCF͸ %JTQPTBCMFΛฦ͢ let observable: Observable = executeButton.rx.tap .asObservable() EJTQPTFͰ TVCTDSJCFΛఀࢭ let disposable = observable.subscribe(onNext: { print(“Ϙλϯ͕ԡ͞Ε·ͨ͠”) }) ্ͷ0CTFSWBCMFΛ TVCTDSJCFͰ଴ͪଓ͚ΔॲཧΛ։࢝

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͍ͭDispose͢Δͷ͔ʁ ॲཧ͕׬ྃͨ࣌͠(completed / error͕ྲྀΕͨ ࣌)͸ࣗಈͰ dispose ͞Ε·͢ɻ ௕͕͔͔࣌ؒ͘Δॲཧ΍ɺͣͬͱ଴ͪଓ͚ΔϢʔ βΫϦοΫΠϕϯτͷ؂ࢹͳͲ͸ɺը໘Λด ͨ͡ͱ͖ͳͲɺෆཁʹͳͬͨλΠϛϯάͰ disposeͰΩϟϯηϧɾఀࢭͤ͞·͢ɻ

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CompositeDisposable ؅ཧର৅ͷ Disposable Λ·ͱΊͯdisposeͰ ͖ΔΫϥεɻը໘಺ͷdisposableΛҰׅఀࢭ ͤ͞Δ࣌ͳͲʹͱͯ΋ศརͰ͢ɻ

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ิ଍ɿRxSwiftͷDisposeBag ը໘ͳͲɺ؂ࢹݩΠϯελϯε͕ࢮΜͩΒࣗ ಈͰͥΜͿdisposeͤ͞Δͱ͖ʹ࢖͑Δศར Ϋϥεɻ ˠ3Yඪ४Ͱ͸ͳ͍Ͱ͕͢ɺ3Y4XJGUͰ͸ $PNQPTJUF%JTQPTBCMFͷ୅ΘΓʹ%JTQPTF#BHΛ ࢖͍·͢ɻ

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ൃలฤ

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ϚϧνεϨουॲཧ Observableʹ͸ - (্ྲྀͷ)ΠϕϯτൃߦΛͲͷεϨουͰॲཧ͢Δ͔ - (ԼྲྀͰ)ड͚औΔ࣌ʹͲͷεϨουͰॲཧ͢Δ͔ ͷ̎छྨͷεϨουίϯτϩʔϧϝιου͕͋Γ· ͢ɻ

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ϚϧνεϨουॲཧ - (্ྲྀͷ)ΠϕϯτൃߦΛͲͷεϨουͰॲཧ͢Δ͔ → subscribeOn(<εϨουࢦఆ>) ྫɿAPIͷ௨৴࣮ߦεϨουΛόοΫͰಈ͔͍ͨ͠ - (ԼྲྀͰ)ड͚औΔ࣌ʹͲͷεϨουͰॲཧ͢Δ͔ → observeOn(<εϨουࢦఆ>) ྫɿ݁Ռදࣔ͸UIεϨουͰॲཧ͍ͨ͠

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্ྲྀͷεϨουΛม͑Δ Observable .from([1,2,3,4,5]) .filter { $0 % 2 == 1 } .subscribe(onNext: { print(“next: \($0)”) }) 0CTFSWBCMF*OU 0CTFSWBCMF*OU <*OU> TVCTDSJCF TVCTDSJCF PO/FYU PO/FYU TVCTDSJCF࣮ߦεϨου ϝΠϯεϨου όοΫάϥ΢ϯυεϨου

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্ྲྀͷεϨουΛม͑Δ Observable .from([1,2,3,4,5]) .filter { $0 % 2 == 1 } .subscribe(onNext: { print(“next: \($0)”) }) 0CTFSWBCMF*OU 0CTFSWBCMF*OU 0CTFSWBCMF*OU <*OU> TVCTDSJCF TVCTDSJCF TVCTDSJCF PO/FYU PO/FYU PO/FYU .subscribeOn(ConcurrentD ispatchQueueScheduler(qos : .background)) TVCTDSJCF࣮ߦεϨου ϝΠϯεϨου όοΫάϥ΢ϯυεϨου

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ԼྲྀͷεϨουΛม͑Δ Observable .from([1,2,3,4,5]) .filter { $0 % 2 == 1 } .subscribe(onNext: { print(“next: \($0)”) }) 0CTFSWBCMF*OU 0CTFSWBCMF*OU <*OU> TVCTDSJCF TVCTDSJCF PO/FYU PO/FYU TVCTDSJCF࣮ߦεϨου ϝΠϯεϨου όοΫάϥ΢ϯυεϨου

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ԼྲྀͷεϨουΛม͑Δ Observable .from([1,2,3,4,5]) .filter { $0 % 2 == 1 } .subscribe(onNext: { print(“next: \($0)”) }) 0CTFSWBCMF*OU 0CTFSWBCMF*OU 0CTFSWBCMF*OU <*OU> TVCTDSJCF TVCTDSJCF TVCTDSJCF PO/FYU PO/FYU PO/FYU .observeOn(MainSchedula r.instance) TVCTDSJCF࣮ߦεϨου ϝΠϯεϨου όοΫάϥ΢ϯυεϨου

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૊Έ߹Θͤ Observable .from([1,2,3,4,5]) .filter { $0 % 2 == 1 } .subscribe(onNext: { print(“next: \($0)”) }) 0CTFSWBCMF*OU 0CTFSWBCMF*OU 0CTFSWBCMF*OU <*OU> TVCTDSJCF TVCTDSJCF TVCTDSJCF PO/FYU PO/FYU PO/FYU .subscribeOn(ConcurrentD ispatchQueueScheduler(qos : .background)) .observeOn(MainSchedula r.instance) PO/FYU TVCTDSJCF TVCTDSJCF࣮ߦεϨου ϝΠϯεϨου όοΫάϥ΢ϯυεϨου 0CTFSWBCMF*OU

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ϚϧνεϨουॲཧͷ·ͱΊ APIͳͲཪͰ࣮ߦ͍ͨ͠ॏ͍ॲཧ͸ subscribeOn() ͰόοΫάϥ΢ϯυεϨουΛࢦఆ͢Δɻ ड͚औΓΛϝΠϯεϨουͰߦ͍͍ͨ࣌͸ observeOn()ͰϝΠϯεϨουΛࢦఆ͢Δɻ εϚϗΞϓϦ։ൃͰ͸͜Ε͚͓͚֮ͩ͑ͯ͹OKɻ

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ετϦʔϜ݁߹

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Observable͸৭ʑͳํ๏(Φ ϖϨʔλ)Ͱ࿈݁ɾ݁߹͢Δ͜ ͱ͕Ͱ͖·͢ ɾObservableม׵(طग़ / ݁ՌΛड͚औͬͯॱ൪ʹॲཧ ͢Δ) ɾฒྻͭͳ͗(ObservableΛಉ࣮࣌ߦ͢Δ) ɾ௚ྻͭͳ͗(Observableͷ݁ՌΛड͚औͬͯผͷ ObservableΛॲཧ͢Δ)

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Observable .zip( ) ฒྻͭͳ͗(zip ΦϖϨʔλ) Observable .from([1,2,3,4,5]) 0CTFSWBCMF*OU 0CTFSWBCMF*OU Observable .from([10,9,8,7,6]) 0CTFSWBCMF*OU 0CTFSWBCMF *OU *OU .map { a, b in a * b }

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Observable .zip( ) ฒྻͭͳ͗(zip ΦϖϨʔλ) Observable .from([1,2,3,4,5]) 0CTFSWBCMF*OU 0CTFSWBCMF*OU Observable .from([10,9,8,7,6]) 0CTFSWBCMF*OU 0CTFSWBCMF *OU *OU .map { a, b in a * b } [JQΦϖϨʔλͰ " #݁߹ ී௨ͷ0CTFSWBCMF" ී௨ͷ0CTFSWBCMF# ݁߹݁Ռ͸ " # " # ͱ͍͏ετϦʔϜ

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.flatMap{ a in } self.fetchAPI(a) ௚ྻͭͳ͗(ﬂatMap ΦϖϨʔλ) Observable .from([1,2,3,4,5]) B*OU 0CTFSWBCMF*OU 0CTFSWBCMF*OU 0CTFSWBCMF*OU 0CTFSWBCMF*OU .map { $0 * 2 }

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.flatMap{ a in } self.fetchAPI(a) ௚ྻͭͳ͗(ﬂatMap ΦϖϨʔλ) Observable .from([1,2,3,4,5]) B*OU 0CTFSWBCMF*OU 0CTFSWBCMF*OU 0CTFSWBCMF*OU 0CTFSWBCMF*OU qBU.BQΦϖϨʔ λͰ "͔Β#ʹͭͳ͙ ී௨ͷ0CTFSWBCMF" "͔ΒྲྀΕͨ஋Λ࢖͍ɺ "1*௨৴ͯ݁͠ՌΛྲྀ͢ 0CTFSWBCMF# .map { $0 * 2 }

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෼ׂ΋Ͱ͖Δ Observable .from([1,2,3,4,5]) .filter { $0 % 2 == 1 } .map { $0 * 2 } .subscribe(onNext: { print(“next: \($0)”) }) 0CTFSWBCMF*OU 0CTFSWBCMF*OU 0CTFSWBCMF*OU <*OU> %JTQPTBCMF

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෼ׂ΋Ͱ͖·͢ Observable .from([1,2,3,4,5]) .filter { $0 % 2 == 1 } .subscribe(onNext: { print(“next: \($0)”) }) 0CTFSWBCMF*OU <*OU> .map { $0 * 2 } .subscribe(onNext: { print(“next: \($0)”) }) 0CTFSWBCMF*OU 0CTFSWBCMF*OU .subscribe(onNext: { print(“next: \($0)”) }) %JTQPTBCMF %JTQPTBCMF %JTQPTBCMF

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෼ׂͨ͠৔߹͸subscribe࣌ʹετϦʔϜม׵աఔ ͕ෳ੡͞Ε·͢ɻ Observable .from([1,2,3,4,5]) .filter { $0 % 2 == 1 } .subscribe(onNext: { print(“next: \($0)”) }) 0CTFSWBCMF*OU <*OU> .map { $0 * 2 } 0CTFSWBCMF*OU 0CTFSWBCMF*OU .subscribe(onNext: { print(“next: \($0)”) }) Observable .from([1,2,3,4,5]) .filter { $0 % 2 == 1 } 0CTFSWBCMF*OU <*OU> 0CTFSWBCMF*OU .map { $0 * 2 } .subscribe(onNext: { print(“next: \($0)”) }) 0CTFSWBCMF*OU Observable .from([1,2,3,4,5]) .filter { $0 % 2 == 1 } 0CTFSWBCMF*OU <*OU> 0CTFSWBCMF*OU %JTQPTBCMF %JTQPTBCMF %JTQPTBCMF ͢΂ͯผͷաఔͰ ετϦʔϜΛ TVCTDSJCF͍ͯ͠Δ

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(தڃ)ෳ੡ͤ͞ͳ͍ͨΊͷtips Hot ͱ Cold Observable ͸ Cold / Hot ʹ෼͔Ε͍ͯͯɺ جຊ͸໌ࣔతʹHotม׵͠ͳ͍ݶΓ Cold Observable ͱࢥ͓͍ͬͯ ͨ΄͏͕͍͍Ͱ͢ɻ(ݫີʹ͸ҧ͍·͕͢؆୯ͷͨΊ) Cold͸subscribe͞ΕΔ·Ͱಈ͔ͣɺsubscribeͷ౎౓ෳ੡͞ΕΔ(1͔ ΒετϦʔϜ͕࢝·Δ)ͱ͍͏ಛ௃͕͋Γ·͢ɻ Hot͸subscribe͞Εͳͯ͘΋ಈ͖ɺ̎ͭҎ্ͷsubscribe͕͋ͬͯ΋ ಉ͡ετϦʔϜΛڞ༗͠·͢ɻ

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Hot / Cold ม׵: Cold → Hot share(), shareReplay(), publish() ͳͲͷ Hotม׵ΦϖϨʔλʹΑΓHot ʹม׵Ͱ͖· ͢ɻ

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Hot / Cold ม׵: Hot → Cold share(), shareReplay(), publish() Ҏ֎ͷ΄΅ ͢΂ͯͷΦϖϨʔλ͸ Cold ͳ Observable Λฦ͠·͢ɻ ྫɿ ﬁlter, map, from, ﬂatMap, zipͳͲ

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Hotม׵ͱݺ͹ΕΔΦϖϨʔλʹΑΓɺ ෳ੡͞Εͳ͘ͳΓ·͢ɻ Observable .from([1,2,3,4,5]) .filter { $0 % 2 == 1 } 0CTFSWBCMF*OU <*OU> 0CTFSWBCMF*OU %JTQPTBCMF .share() %JTQPTBCMF IPUม׵ͷྫ TIBSF ΦϖϨʔλ 0CTFSWBCMF*OU .subscribe(onNext: { print(“next: \($0)”) }) .subscribe(onNext: { print(“next: \($0)”) }) ಉ͡ετϦʔϜΛ࢖͍ճ͢ ʹ৽ͨʹੜ੒͠ͳ͍͍ͯ͘෼ίετ͕௿͍

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Hotม׵ͷϝϦοτ ɾԿ౓΍ͬͯ΋ಉ݁͡ՌʹͳΔ͕ɺॲཧʹ࣌ ͕͔͔ؒΔίετ୹ॖͰ͖Δ Hotม׵ͷσϝϦοτ ɾཧղͤͣʹ࢖͏ͱλΠϛϯάʹΑͬͯ͸ظ଴௨Γ Πϕϯτ͕དྷͳ͘ͳΓɺϋϚΔɻ (ઌʹଞͷsubscribe()͕͍Δ͔Ͳ͏͔Ͱڍಈ͕ม ΘͬͨΓ͢Δ)

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ColdͷϝϦοτ ɾΘ͔Γ΍͍͢ ColdͷσϝϦοτ ɾ৔߹ʹΑͬͯ͸ॲཧ͕ॏ͘ͳΔ →ύϑΥʔϚϯεͷ໰୊͕ग़͔ͯΒ ɹHot/Coldʹ͍ͭͯௐ΂Ε͹OKͩͱࢥ͍· ͢ɻ

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Hot / Cold ·ͱΊ ׳ΕͨΒ࢖ͬͯΈΑ͏ɻ ׳Εͳ͍͏ͪ͸৮Βͳ͍΄͏͕٢ɻ

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·ͱΊ • Πϕϯτɾσʔλ͸ԿͰ΋RxԽͰ͖ΔɻΠϕϯ τɾσʔλͷ΍ΓऔΓΛετϦʔϜͱͯ͠ߟ͑Α ͏ • ॲཧͷεςοϓ(ϑΟϧλɺܭࢉɺσʔλಡΈॻ͖) ΛετϦʔϜม׵ͱଊ͑Α͏ɻ • RxΛۃΊͨΒඇಉظॲཧ΋γϯϓϧʹ෭࡞༻ͳ ͘ɺεϚʔτʹॻ͚ΔΑ͏ʹͳΓ·͢ɻ

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Rx ͸؆୯ʹࢼͤ·͢ • Java, Kotlin ։ൃ؀ڥ͕͋ΔͳΒ… • Grade Ͱ RxJava2, RxAndroid, RxKotlinΛೖΕͯΈΔɻ • Swift ։ൃ؀ڥ͕͋ΔͳΒ… • CocoaPods Ͱ RxSwiftΛೖΕͯΈΔɻ • Ͳͬͪ΋ͳ͍৔߹ • RxJS Playground ͰͳΜͱϒϥ΢βͰࢼͤΔʂ • https://rxjs-playground.github.io/ (RxJS Playground Ͱݕࡧ)

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͍͞͝ʹ • tech vein Ͱ͸͜ΜͳΞϓϦΤϯδχΞɺ  ϑϦʔϥϯεɾύʔτφʔ༷Λืू͍ͯ͠·͢ɻ • RxSwift, RxJava Λ࢖͍͍ͨ • MVVMɺ CleanArchitectureɺ DI Λ׆༻ͨ͠ઃܭʹڵຯ͕͋Δ ڵຯ͕͋Δํɺͪΐͬͱ࿩Λฉ͍ͯΈ͍ͨํ  ͨͩ3Yͷ࿩Λ΋ͬͱฉ͖͍ͨํ΋  ͥͻ͓੠͕͚Լ͍͞ʂ

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ࢀߟ • RxSwift / RxJava Observable νʔτγʔτ  https://docs.google.com/spreadsheets/u/1/d/ 12C3MLr2RfrYPezHJTmjruDt3i8TRZGCJDnVz86vo39g/edit#gid=0 • SubjectͱRelayͷҧ͍ͳͲObservableͷ೿ੜΫϥεͷ࢓༷Λ·ͱΊͨਤͰ͢ɻ • RxSwift + RxCocoa Λ࢖ͬͨ؆୯ͳΞϓϦ • GitHub:  https://github.com/ecoopnet/rxswift-beginner • ࢀߟهࣄ • Կͱͳ͘RxJavaΛ࢖ͬͯΔ͚Ͳਖ਼௚Α͘෼͔ͬͯͳ͍ਓ͕ಡΉͱྑͦ͞͏ͳهࣄɾجૅฤ  https://qiita.com/k-mats/items/4d374460a3f6284dd09f

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͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠ɻ

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͓·͚ɿRxͷجຊ Rxͷߟ͑ํͷجૅ

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ReactiveXͱ͸Կ͔ʁ ReactiveX = Reactive Extension ൓Ԡతϓϩάϥϛϯά(Reactive Programming)Λ͢ΔͨΊ ͷ֦ுϥΠϒϥϦ(Extensions Library)ͷ͜ͱɻ ReactiveX͸̏ͭͷઃܭࢥ૝Λ૊Έ߹Θͤͯ࡞ΒΕͨϥΠ ϒϥϦͰ͢ɻ - GoF σβΠϯύλʔϯͷ Observable ύλʔϯ - GoF σβΠϯύλʔϯͷ Iterator ύλʔϯ - ؔ਺ܕϓϩάϥϛϯά ʁ ࠶ܝ

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Observerύλʔϯ σʔλΛ؂ࢹ͢Δਓͱ఻͑Δ࢓૊ΈΛ ந৅Խͨ͠σβΠϯύλʔϯ ͕͜͜େࣄʂ

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0CTFSWFS͕4VCKFDUʹBEE0CTFSWFSͰࣗ෼Λొ࿥

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݁Ռ௨஌͢Δͱ͖͸4VCKFDU͕OPUJGZ͢Δ

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$PODSFUFΫϥεಉ࢜͸ɺ ͓ޓ͍Λ஌Βͳ͍··ɺଟରଟͷؔ܎Ͱɺ ΠϕϯτΛ΍ΓऔΓͰ͖Δ

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Iterator ύλʔϯ https://ja.wikipedia.org/wiki/Iterator_ύλʔϯ ೚ҙͷσʔλΛॱ൪ʹॲཧ͢ΔσβΠϯύλʔϯ ͕͜͜େࣄʂ

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࣍ͷσʔλΛॱ൪ʹ next() Ͱऔͬͯ͘Δ͚ͩͳͷͰɺ Iteratorͷ࣮ମ͕Կ݅͋ͬͯ΋ɺͲ͏͍͏σʔλߏ଄Ͱ͋ͬͯ΋ɺ ͨͱ͑σʔλ͕શ෦ἧ͍ͬͯͳͯ͘΋ɺಉ͡ํ๏Ͱॱ൪ʹऔಘͰ͖Δ ʁ *UFSBUPS 4USJOH ·ͩ͋Δʁ IBT/FYU ͋ΔΑ USVF ͍ͩ͘͞ OFYU Ͳ͏ͧ lIPHFz

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ؔ਺ܕϓϩάϥϛϯά ˠ ͦΕͧΕͷؔ਺͸ */065ʹ͔͠ Өڹ͠ͳ͍ ˠ෭࡞༻͕ͳ͍ Α͏ʹॻ͚Δ

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Rx ʹ Observerύλʔϯ + Iterator ύλʔϯ + ؔ਺ܕϓϩάϥϛϯά ग़యIUUQSFBDUJWFYJP