Androidの非同期処理をKotlinコルーチンで行う

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"OESPJEͷඇಉظॲཧΛ ɹɹɹɹɹίϧʔνϯͰߦ͏ 3Y+B/JHIU 5PTIJIJSP:BHJ

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ࣗݾ঺հ w ീ໦ढ़޿ !TZTZBHJ w "OESPJEΤϯδχΞ ٕज़෦௕

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3Y+B/JHIUͳͷʹ ίϧʔνϯʁ

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3Y+BWBͷ༻్ w -JTUॲཧͷந৅ԽɾετϦʔϜԽ w 0QUJPOBM w 1SPNJTF w %BUB#JOEJOH w &WFOU#VT

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3Y+BWBͷ༻్ w -JTUॲཧͷந৅ԽɾετϦʔϜԽ w 0QUJPOBM w 1SPNJTF w %BUB#JOEJOH w &WFOU#VT

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1SPNJTFͱͯ͠ͷ3Y+BWBΛ ίϧʔνϯ BTZODBXBJU Ͱஔ͖׵͑ΒΕΔͷͰ͸ʁ

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ΞδΣϯμ w ίϧʔνϯͱ͸ͳʹ͔ w ,PUMJOʹ͓͚Δίϧʔνϯ w ࠓճऔΓѻ͏ඇಉظॲཧͷൣғ w 3Y+BWBͰͷ࣮૷ w ίϧʔνϯͰͷ࣮૷ w ײ૝

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ίϧʔνϯͱ͸ͳʹ͔

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ίϧʔνϯͱ͸ͳʹ͔ w ίϧʔνϯʢӳDPSPVUJOFʣͱ͸ϓϩάϥϛ ϯάͷߏ଄ͷҰछɻαϒϧʔνϯ͕ΤϯτϦʔ͔ ΒϦλʔϯ·ͰΛҰͭͷॲཧ୯Ґͱ͢Δͷʹର͠ɺ ίϧʔνϯ͸͍ͬͨΜॲཧΛதஅͨ͠ޙɺଓ͖͔ ΒॲཧΛ࠶։Ͱ͖Δ w αϒϧʔνϯͱҟͳΓɺঢ়ଶ؅ཧΛҙࣝͤͣʹߦ ͑ΔͨΊɺڠௐతॲཧɺΠςϨʔλɺແݶϦετɺ ύΠϓͳͲɺܧଓঢ়گΛ࣋ͭϓϩάϥϜ͕༰қʹ هड़Ͱ͖Δɻ WJB8JLJQFEJBIUUQTKBXJLJQFEJBPSHXJLJ&#&"#&#$&&#

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ؔ਺ͷ్தͰதஅͨ͠Γ ࠶։ͨ͠ΓͰ͖Δ΍ͭ

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,PUMJOʹ͓͚Δίϧʔνϯ

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,PUMJO͔Βಋೖ w ʹϦϦʔε w ݴޠ࢓༷ʹʮίϧʔνϯΛ࣮૷͢ΔͨΊ ͷػೳʯΛ௥Ճ ࢓༷Λٞ࿦͢ΔϦϙδτϦ IUUQTHJUIVCDPN,PUMJOLPUMJODPSPVUJOFTCMPCNBTUFSLPUMJODPSPVUJOFTJOGPSNBMNE

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࣮ࡍͷػೳ͸ϥΠϒϥϦͱͯ͠ఏڙ w DPSF SFBDUJWF VJ JOUFHSBUJPOͳ ͲͷϞδϡʔϧʹ෼͔Ε͍ͯΔ ίϧʔνϯϥΠϒϥϦͷϦϙδτϦ IUUQTHJUIVCDPN,PUMJOLPUMJOYDPSPVUJOFT

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"OESPJE޲͚ʹ΋ଗ͍ͬͯΔ w DPSFͱVJBOESPJEϞδϡʔϧΛ࢖͑͹ େମ͍͚Δ "OESPJEϞδϡʔϧͷ༷ࢠ IUUQTHJUIVCDPN,PUMJOLPUMJOYDPSPVUJOFTUSFFNBTUFSVJLPUMJOYDPSPVUJOFTBOESPJE

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ͨͩ͠·ͩFYQFSJNFOUBM w LPUMJOYDPSPVUJOFTFYQFSJNFOUBM ύοέʔδʹؔ࿈͢ΔΫϥε͕͋Δ w ຊ൪౤ೖ͸ͦΕͳΓʹ֮ޛ͕ඞཁ

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ࠓճऔΓѻ͏ඇಉظॲཧͷൣғ

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ࠓճऔΓѻ͏ඇಉظॲཧͷൣғ w ୯ൃͷ࣮ߦ w ௚ྻͷ࣮ߦ w ฒྻͷ࣮ߦ w ΤϥʔϋϯυϦϯά w Ωϟϯηϧ ʴ

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3Y+BWBͰͷ࣮૷

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؀ڥ w 3Y"OESPJE w 3Y,PUMJO

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୯ൃͷ࣮ߦ val disposable = shopApi.getShop(10) .subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .subscribe( { // success }, { // error } ) εέδϡʔϥΛ͍͍ײ͡ʹઃఆ

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௚ྻͷ࣮ߦ val disposable = userApi.me() .flatMap { user -> subscriptionShopApi.getSubscriptionShops(user.id) } .subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .subscribe( { // success }, { // error } ) qBU.BQΛ࢖ͬͯ௚ྻʹ࣮ߦ͢Δ

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ฒྻͷ࣮ߦ val disposable = Single.zip>( userApi.me().subscribeOn(Schedulers.io()), shopApi.getShop(10L).subscribeOn(Schedulers.io()), BiFunction { user, shop -> Pair(user, shop) } ) .observeOn(AndroidSchedulers.mainThread()) .subscribe( { (user, shop) -> // success }, { // error } ) [JQΛ࢖ͬͯฒྻʹ࣮ߦ͢Δ

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Ωϟϯηϧ val disposable = shopApi.getShop(10) .subscribe(/*ུ*/) disposable.dispose()

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ίϧʔνϯͰͷ࣮૷

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؀ڥ w ,PUMJO w LPUMJOYDPSPVUJOFTDPSF w LPUMJOYDPSPVUJOFTBOESPJE

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୯ൃͷ࣮ߦ val job = launch(UI) { try { val shop = async(CommonPool) { shopApi.getShop(10) }.await() // success! } catch (e: Exception) { // error } }

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୯ൃͷ࣮ߦ val job = launch(UI) { try { val shop = async(CommonPool) { shopApi.getShop(10) }.await() // success! } catch (e: Exception) { // error } } Ϗϧμʔؔ਺ͱΑ͹ΕΔɺ ίϧʔνϯΛߏங͢Δؔ਺

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MBVODIؔ਺ w $PSPVUJOF$POUFYUʹ࣮ߦ؀ڥΛࢦఆ͢Δ w $PSPVUJOF4UBSU͸࣮ߦ։࢝ͷλΠϛϯάΛࢦఆ͢Δ w ୈࡾҾ਺ʹ࣮ߦ͢ΔϒϩοΫΛ౉͢ w ࣮ߦঢ়ଶΛද͢+PCΛฦ͢ IUUQTLPUMJOHJUIVCJPLPUMJOYDPSPVUJOFTLPUMJOYDPSPVUJOFTDPSFLPUMJOYDPSPVUJOFTFYQFSJNFOUBMMBVODIIUNM fun launch( context: CoroutineContext, start: CoroutineStart = CoroutineStart.DEFAULT, block: suspend CoroutineScope.() -> Unit ): Job

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MBVODIؔ਺ val job = launch(UI) { //…

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MBVODIؔ਺ val job = launch(UI) { //… LPUMJOYDPSPVUJOFTBOESPJE͕ఏڙ͢Δ$PSPVUJOF$POUFYUɻ ౉ͨ͠ϒϩοΫ಺ͷ͢΂ͯͷ࠶։ॲཧΛ6*εϨουͰߦ͏ɻ

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BTZODؔ਺ w ୈࡾҾ਺Ͱ࣮ߦ͢ΔϒϩοΫ͕໭Γ஋Λ࣋ͭ w ࣮ߦঢ়ଶͱ࣮ߦ݁ՌΛ࣋ͭ%FGFSSFE5Λฦ͢ IUUQTLPUMJOHJUIVCJPLPUMJOYDPSPVUJOFTLPUMJOYDPSPVUJOFTDPSFLPUMJOYDPSPVUJOFTFYQFSJNFOUBMBTZODIUNM fun async( context: CoroutineContext, start: CoroutineStart = CoroutineStart.DEFAULT, block: suspend CoroutineScope.() -> T ): Deferred

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BTZODؔ਺ val job = launch(UI) { try { val shop = async(CommonPool) { shopApi.getShop(10) }.await() //…

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BTZODؔ਺ val job = launch(UI) { try { val shop = async(CommonPool) { shopApi.getShop(10) }.await() //… LPUMJOYDPSPVUJOFTDPSF͕ఏڙ͢Δ$PSPVUJOF$POUFYUɻ KBWBVUJMDPODVSSFOU'PSL+PJO1PPMDPNNPO1PPM Λ ࢖ͬͯεϨουϓʔϧΛ࡞Γɺ࠶։ॲཧΛεϨουͰ࣮ߦ͢Δɻ "OESPJE؀ڥ /FYVT9 Ͱ͸ϓʔϧαΠζ͸ͩͬͨɻ

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୯ൃͷ࣮ߦ val job = launch(UI) { try { val shop = async(CommonPool) { shopApi.getShop(10) }.await() // success! } catch (e: Exception) { // error } }

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୯ൃͷ࣮ߦ val job = launch(UI) { try { val shop = async(CommonPool) { shopApi.getShop(10) }.await() // success! } catch (e: Exception) { // error } } 6*εϨουͰ଴ͪ߹Θ͍͍ͤͯͷ͔ͳʜ

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୯ൃͷ࣮ߦ val job = launch(UI) { try { val shop = async(CommonPool) { shopApi.getShop(10) }.await() // success! } catch (e: Exception) { // error } } %FGFSSFEBXBJU ͸தஅؔ਺

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தஅؔ਺ͱεςʔτϚγϯ w ίϯύΠϥ͕தஅؔ਺ͷݺͼग़͠Λঢ়ଶͱͯ͠෼ ղ͠ɺॲཧશମΛεςʔτϚγϯʹม׵͢Δɻ͜ ΕʹΑΓɺؔ਺ͷதஅͱ࠶։Λ࣮ݱ͍ͯ͠Δ launch(UI) { try { val shop = async(CommonPool) {…}.await() // success! } catch (e: Exception) { // error } } ঢ়ଶ async(CommonPool){…}.await() ঢ়ଶ val shop =… success ঢ়ଶ error

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୯ൃͷ࣮ߦ val job = launch(UI) { try { val shop = async(CommonPool) { shopApi.getShop(10) }.await() // success! } catch (e: Exception) { // error } }

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୯ൃͷ࣮ߦ val job = launch(UI) { try { val shop = async(CommonPool) { shopApi.getShop(10) }.await() // success! } catch (e: Exception) { // error } } ͪΐͬͱ৑௕ͩͳʜ

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ิॿతͳؔ਺Λ༻ҙ͢Δ // async(CommonPool)Λ؆ུԽ͢Δ fun async(context: CoroutineContext = CommonPool, start: CoroutineStart = CoroutineStart.DEFAULT, block: suspend CoroutineScope.() -> T) = kotlinx.coroutines.experimental.async(context, start, block) // launch(UI)Λ؆ུԽ͢Δ fun ui(start: CoroutineStart = CoroutineStart.DEFAULT, block: suspend CoroutineScope.() -> Unit) = launch(UI, start, block)

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୯ൃͷ࣮ߦ val job = ui { try { val shop = async { shopApi.getShop(10) }.await() // success } catch (e: Exception) { // error } }

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௚ྻͷ࣮ߦ val job = ui { try { val userJob = async { userApi.me() } val subscriptionShopsJob = async { subscriptionShopApi.getSubscriptionShops(userJob.await().id) } val subscriptionShops = subscriptionShopsJob.await() // success } catch (e: Exception) { // error } }

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ฒྻͷ࣮ߦ val job = ui { try { val userJob = async { userApi.me() } val shopJob = async { shopApi.getShop(10L) } val user = userJob.await() val shop = shopJob.await() // success catch (e: Exception) { // error } }

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Ωϟϯηϧ val job = launch(UI) { try { val shop = async(CommonPool) { shopApi.getShop(10) }.await() // success! } catch(e: CancellationException) { // cancel } catch (e: Exception) { // error } } job.cancel()

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ײ૝

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ײ૝ w େମ͍͚Δ ஔ͖׵͑ͯ΋Αͦ͞͏ w ௚ྻɺฒྻͷ࢖͍෼͚͕؆୯ w εϨουͷ؅ཧ͕͍ۙ৔ॴʹ͋Δ w ΤϥʔɺΩϟϯηϧ͕શͯྫ֎ͳͷͰϋϯυϦϯ ά͠΍͍͢ w ίϧʔνϯ΋3Y+BWBͱಉ͘͡Β͍Ԟ͕ਂ͍ͷͰ ͦ͜·Ͱؾܰʹ΍ΔͬͯΘ͚ʹ͸͍͔ͳ͍͚Ͳศ རͰ࠷ߴ

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ࢀߟࢿྉ w ࠓճͷίʔυ w IUUQTHJUIVCDPNTZTZBHJJNQMFNFOUBUJPOPGBTZODSFRVFTU XJUISYKBWBPSDPSPVUJOF w $PSPVUJOFTGPS,PUMJO 3FWJTJPO w IUUQTHJUIVCDPN,PUMJOLPUMJODPSPVUJOFTCMPCNBTUFSLPUMJO DPSPVUJOFTJOGPSNBMNE w (VJEFUPLPUMJOYDPSPVUJOFTCZFYBNQMF w IUUQTHJUIVCDPN,PUMJOLPUMJOYDPSPVUJOFTCMPCNBTUFS DPSPVUJOFTHVJEFNE w (VJEFUP6*QSPHSBNNJOHXJUIDPSPVUJOFT w IUUQTHJUIVCDPN,PUMJOLPUMJOYDPSPVUJOFTCMPCNBTUFSVJ DPSPVUJOFTHVJEFVJNE

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THANK YOU