Androidの非同期処理をKotlinコルーチンで行う

スライド内で出てくるURL一覧はコチラ

コルーチンの仕様を議論するリポジトリ: https://github.com/Kotlin/kotlin-coroutines

コルーチンライブラリのリポジトリ:
https://github.com/Kotlin/kotlinx.coroutines

ui-androidモジュール:
https://github.com/Kotlin/kotlinx.coroutines/tree/master/ui/kotlinx-coroutines-android

launch関数のdoc: https://kotlin.github.io/kotlinx.coroutines/kotlinx-coroutines-core/kotlinx.coroutines.experimental/launch.html

async関数のdoc: https://kotlin.github.io/kotlinx.coroutines/kotlinx-coroutines-core/kotlinx.coroutines.experimental/async.html

今回のコード: https://github.com/sys1yagi/implementation-of-async-request-with-rxjava2-or-coroutine

Coroutines for Kotlin (Revision 3.2): https://github.com/Kotlin/kotlin-coroutines/blob/master/kotlin-coroutines-informal.md

Guide to kotlinx.coroutines by example: https://github.com/Kotlin/kotlinx.coroutines/blob/master/coroutines-guide.md

Guide to UI programming with coroutines: https://github.com/Kotlin/kotlinx.coroutines/blob/master/ui/coroutines-guide-ui.md

Transcript

1. "OESPJEͷඇಉظॲཧΛ
   ɹɹɹɹɹίϧʔνϯͰߦ͏ 3Y
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2. ࣗݾ঺հ w ീ໦
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   w "OESPJEΤϯδχΞ
   ٕज़෦௕
3. 3Y
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   ίϧʔνϯʁ
4. 3Y+BWBͷ༻్ w -JTUॲཧͷந৅ԽɾετϦʔϜԽ
   w 0QUJPOBM
   w 1SPNJTF
   w %BUB
   #JOEJOH
   w &WFOU
   #VT
5. 3Y+BWBͷ༻్ w -JTUॲཧͷந৅ԽɾετϦʔϜԽ
   w 0QUJPOBM
   w 1SPNJTF
   w %BUB
   #JOEJOH
   w &WFOU
   #VT
6. 1SPNJTFͱͯ͠ͷ3Y+BWBΛ
   ίϧʔνϯ BTZODBXBJU
   Ͱஔ͖׵͑ΒΕΔͷͰ͸ʁ
7. ΞδΣϯμ w ίϧʔνϯͱ͸ͳʹ͔
   w ,PUMJOʹ͓͚Δίϧʔνϯ
   w ࠓճऔΓѻ͏ඇಉظॲཧͷൣғ
   w 3Y+BWBͰͷ࣮૷
   w ίϧʔνϯͰͷ࣮૷
   w ײ૝
8. ίϧʔνϯͱ͸ͳʹ͔
9. ίϧʔνϯͱ͸ͳʹ͔ w ίϧʔνϯʢӳ
   DPSPVUJOFʣͱ͸ϓϩάϥϛ ϯάͷߏ଄ͷҰछɻαϒϧʔνϯ͕ΤϯτϦʔ͔ ΒϦλʔϯ·ͰΛҰͭͷॲཧ୯Ґͱ͢Δͷʹର͠ɺ ίϧʔνϯ͸͍ͬͨΜॲཧΛதஅͨ͠ޙɺଓ͖͔ ΒॲཧΛ࠶։Ͱ͖Δ
   w αϒϧʔνϯͱҟͳΓɺঢ়ଶ؅ཧΛҙࣝͤͣʹߦ ͑ΔͨΊɺڠௐతॲཧɺΠςϨʔλɺແݶϦετɺ ύΠϓͳͲɺܧଓঢ়گΛ࣋ͭϓϩάϥϜ͕༰қʹ هड़Ͱ͖Δɻ WJB
   8JLJQFEJB
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10. ؔ਺ͷ్தͰதஅͨ͠Γ ࠶։ͨ͠ΓͰ͖Δ΍ͭ
11. ,PUMJOʹ͓͚Δίϧʔνϯ
12. ,PUMJO
    ͔Βಋೖ w ʹϦϦʔε
    w ݴޠ࢓༷ʹʮίϧʔνϯΛ࣮૷͢ΔͨΊ ͷػೳʯΛ௥Ճ ࢓༷Λٞ࿦͢ΔϦϙδτϦ
    IUUQTHJUIVCDPN,PUMJOLPUMJODPSPVUJOFTCMPCNBTUFSLPUMJODPSPVUJOFTJOGPSNBMNE
13. ࣮ࡍͷػೳ͸ϥΠϒϥϦͱͯ͠ఏڙ w DPSF
    SFBDUJWF
    VJ
    JOUFHSBUJPOͳ ͲͷϞδϡʔϧʹ෼͔Ε͍ͯΔ ίϧʔνϯϥΠϒϥϦͷϦϙδτϦ
    IUUQTHJUIVCDPN,PUMJOLPUMJOYDPSPVUJOFT
14. "OESPJE޲͚ʹ΋ଗ͍ͬͯΔ w DPSFͱVJBOESPJEϞδϡʔϧΛ࢖͑͹ େମ͍͚Δ "OESPJEϞδϡʔϧͷ༷ࢠ
    IUUQTHJUIVCDPN,PUMJOLPUMJOYDPSPVUJOFTUSFFNBTUFSVJLPUMJOYDPSPVUJOFTBOESPJE
15. ͨͩ͠·ͩFYQFSJNFOUBM w LPUMJOYDPSPVUJOFTFYQFSJNFOUBM ύοέʔδʹؔ࿈͢ΔΫϥε͕͋Δ
    w ຊ൪౤ೖ͸ͦΕͳΓʹ֮ޛ͕ඞཁ
16. ࠓճऔΓѻ͏ඇಉظॲཧͷൣғ
17. ࠓճऔΓѻ͏ඇಉظॲཧͷൣғ w ୯ൃͷ࣮ߦ
    w ௚ྻͷ࣮ߦ
    w ฒྻͷ࣮ߦ w ΤϥʔϋϯυϦϯά
    w Ωϟϯηϧ ʴ
18. 3Y+BWBͰͷ࣮૷
19. ؀ڥ w 3Y"OESPJE
    
    w 3Y,PUMJO
    
20. ୯ൃͷ࣮ߦ val disposable = shopApi.getShop(10) .subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .subscribe( { // success }, { // error } ) εέδϡʔϥΛ͍͍ײ͡ʹઃఆ
21. ௚ྻͷ࣮ߦ val disposable = userApi.me() .flatMap { user -> subscriptionShopApi.getSubscriptionShops(user.id) } .subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .subscribe( { // success }, { // error } ) qBU.BQΛ࢖ͬͯ௚ྻʹ࣮ߦ͢Δ
22. ฒྻͷ࣮ߦ val disposable = Single.zip<User, Shop, Pair<User, Shop>>( 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
23. Ωϟϯηϧ val disposable = shopApi.getShop(10) .subscribe(/*ུ*/) disposable.dispose()
24. ίϧʔνϯͰͷ࣮૷
25. ؀ڥ w ,PUMJO
    
    w LPUMJOYDPSPVUJOFTDPSF
    
    w LPUMJOYDPSPVUJOFTBOESPJE
    
    
26. ୯ൃͷ࣮ߦ val job = launch(UI) { try { val shop = async(CommonPool) { shopApi.getShop(10) }.await() // success! } catch (e: Exception) { // error } }
27. ୯ൃͷ࣮ߦ val job = launch(UI) { try { val shop = async(CommonPool) { shopApi.getShop(10) }.await() // success! } catch (e: Exception) { // error } } Ϗϧμʔؔ਺ͱΑ͹ΕΔɺ
    ίϧʔνϯΛߏங͢Δؔ਺
28. MBVODIؔ਺ w $PSPVUJOF$POUFYUʹ࣮ߦ؀ڥΛࢦఆ͢Δ
    w $PSPVUJOF4UBSU͸࣮ߦ։࢝ͷλΠϛϯάΛࢦఆ͢Δ
    w ୈࡾҾ਺ʹ࣮ߦ͢ΔϒϩοΫΛ౉͢
    w ࣮ߦঢ়ଶΛද͢+PCΛฦ͢ IUUQTLPUMJOHJUIVCJPLPUMJOYDPSPVUJOFTLPUMJOYDPSPVUJOFTDPSFLPUMJOYDPSPVUJOFTFYQFSJNFOUBMMBVODIIUNM fun launch( context: CoroutineContext, start: CoroutineStart = CoroutineStart.DEFAULT, block: suspend CoroutineScope.() -> Unit ): Job
29. MBVODIؔ਺ val job = launch(UI) { //…
30. MBVODIؔ਺ val job = launch(UI) { //… LPUMJOYDPSPVUJOFTBOESPJE͕ఏڙ͢Δ$PSPVUJOF$POUFYUɻ
    ౉ͨ͠ϒϩοΫ಺ͷ͢΂ͯͷ࠶։ॲཧΛ6*εϨουͰߦ͏ɻ
31. BTZODؔ਺ w ୈࡾҾ਺Ͱ࣮ߦ͢ΔϒϩοΫ͕໭Γ஋Λ࣋ͭ
    w ࣮ߦঢ়ଶͱ࣮ߦ݁ՌΛ࣋ͭ%FGFSSFE5Λฦ͢ IUUQTLPUMJOHJUIVCJPLPUMJOYDPSPVUJOFTLPUMJOYDPSPVUJOFTDPSFLPUMJOYDPSPVUJOFTFYQFSJNFOUBMBTZODIUNM fun <T> async( context: CoroutineContext, start: CoroutineStart = CoroutineStart.DEFAULT, block: suspend CoroutineScope.() -> T ): Deferred<T>
32. BTZODؔ਺ val job = launch(UI) { try { val shop = async(CommonPool) { shopApi.getShop(10) }.await() //…
33. BTZODؔ਺ val job = launch(UI) { try { val shop = async(CommonPool) { shopApi.getShop(10) }.await() //… LPUMJOYDPSPVUJOFTDPSF͕ఏڙ͢Δ$PSPVUJOF$POUFYUɻ KBWBVUJMDPODVSSFOU'PSL+PJO1PPMDPNNPO1PPM Λ
    ࢖ͬͯεϨουϓʔϧΛ࡞Γɺ࠶։ॲཧΛεϨουͰ࣮ߦ͢Δɻ
    "OESPJE؀ڥ /FYVT9 Ͱ͸ϓʔϧαΠζ͸ͩͬͨɻ
34. ୯ൃͷ࣮ߦ val job = launch(UI) { try { val shop = async(CommonPool) { shopApi.getShop(10) }.await() // success! } catch (e: Exception) { // error } }
35. ୯ൃͷ࣮ߦ val job = launch(UI) { try { val shop = async(CommonPool) { shopApi.getShop(10) }.await() // success! } catch (e: Exception) { // error } } 6*εϨουͰ଴ͪ߹Θ͍͍ͤͯͷ͔ͳʜ
36. ୯ൃͷ࣮ߦ val job = launch(UI) { try { val shop = async(CommonPool) { shopApi.getShop(10) }.await() // success! } catch (e: Exception) { // error } } %FGFSSFEBXBJU ͸தஅؔ਺
37. 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
38. ୯ൃͷ࣮ߦ val job = launch(UI) { try { val shop = async(CommonPool) { shopApi.getShop(10) }.await() // success! } catch (e: Exception) { // error } }
39. ୯ൃͷ࣮ߦ val job = launch(UI) { try { val shop = async(CommonPool) { shopApi.getShop(10) }.await() // success! } catch (e: Exception) { // error } } ͪΐͬͱ৑௕ͩͳʜ
40. ิॿతͳؔ਺Λ༻ҙ͢Δ // async(CommonPool)Λ؆ུԽ͢Δ fun <T> 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)
41. ୯ൃͷ࣮ߦ val job = ui { try { val shop = async { shopApi.getShop(10) }.await() // success } catch (e: Exception) { // error } }
42. ௚ྻ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 } }
43. ௚ྻ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 } } VTFS+PCͷ݁ՌΛ଴ͪ߹Θͤͨ͋ͱ࣮ߦ
44. 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 } }
45. 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 } } $PSPVUJOF4UBSU%&'"6-5Λ࢖͍ͬͯΔͷͰ
    ͦΕͧΕ$PNNPO1PPMͰ௚ͪʹ࣮ߦ͞ΕΔ
46. 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()
47. 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() ྫ֎ͱͯ͠ॲཧ
48. ײ૝
49. 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
50. ࢀߟࢿྉ w ࠓճͷίʔυ
    w IUUQTHJUIVCDPNTZTZBHJJNQMFNFOUBUJPOPGBTZODSFRVFTU XJUISYKBWBPSDPSPVUJOF
    w $PSPVUJOFT
    GPS
    ,PUMJO
    3FWJTJPO
    
    w IUUQTHJUIVCDPN,PUMJOLPUMJODPSPVUJOFTCMPCNBTUFSLPUMJO DPSPVUJOFTJOGPSNBMNE
    w (VJEF
    UP
    LPUMJOYDPSPVUJOFT
    CZ
    FYBNQMF
    w IUUQTHJUIVCDPN,PUMJOLPUMJOYDPSPVUJOFTCMPCNBTUFS DPSPVUJOFTHVJEFNE
    w (VJEF
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    6*
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    DPSPVUJOFT
    w IUUQTHJUIVCDPN,PUMJOLPUMJOYDPSPVUJOFTCMPCNBTUFSVJ DPSPVUJOFTHVJEFVJNE
51. THANK YOU