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৮ͬͯΘ͔ΔCoroutine FiNC Technologies Inc. / Engineer Development Kensuke Izumi

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ࣗݾ঺հ Kensuke Izumi Android Engineer @FiNC Kotlin / javascript / ruby Twitter: @izmeal2000

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͍͔ʹͯ͠๻͸reject͞Εͨͷ͔

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͍͔ʹͯ͠๻͸reject͞Εͨͷ͔ νʔϜ಺Ͱͷෳ਺ճͷϨϏϡʔΛܦͯ ϒϥογϡΞοϓ͞ΕͨCFP!

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͍͔ʹͯ͠๻͸reject͞Εͨͷ͔ ͗Γ͗Γ·Ͱ೪ͬͯमਖ਼ʹमਖ਼ΛॏͶͯSUBMIT!!! At 23:59 2018/10/21

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͍͔ʹͯ͠๻͸reject͞Εͨͷ͔

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͍͔ʹͯ͠๻͸reject͞Εͨͷ͔ Rejected by System

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ΞδΣϯμ 1. Coroutineॳ৺ऀʹཱͪ͸͔ͩΔ೉ղͳఆٛͨͪ 2. Androidʹ͓͚ΔThreadͷ෮श 3. CoroutineͱThreadͷؔ܎ 4. Coroutineͷղܾ͢Δ՝୊

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ΞδΣϯμ 1. Coroutineॳ৺ऀʹཱͪ͸͔ͩΔ೉ղͳఆٛͨͪ 2. Androidʹ͓͚ΔThreadͷ෮श 3. CoroutineͱThreadͷؔ܎ 4. Coroutineͷղܾ͢Δ՝୊

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What is Coroutine?

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What is Coroutine? Coroutines are light weight threads

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What is Coroutine? Coroutines are light weight threads ?

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ු͔ΜͰ͖ͨٙ໰ Coroutines are light weight threads ίϧʔνϯ͸ܰྔεϨου

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ු͔ΜͰ͖ͨٙ໰ Coroutines are light weight threads CoroutineͬͯThreadͱର౳ʹൺֱͯ͠ྑ͍΋ͷͳͷʁ ݁ہJVMεϨου্Ͱ࣮ߦ͞ΕΔͷͰ͸ʁ

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ͦ΋ͦ΋Threadͬͯɺɺɺ ๻͕Android։ൃΛ࢝Ίͨ౰࣌ͷঢ়گ ඇಉظॲཧʁɹRXʂ

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ͦ΋ͦ΋Threadͬͯɺɺɺ ๻͕Android։ൃΛ࢝Ίͨ౰࣌ͷঢ়گ ඇಉظॲཧʁɹRXʂ Thread? observeOnͱ͔Ͱࢦఆ͢Δ΍ͭʂ

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Threadͷࡶͳೝࣝ Threadͷ෮श͔Β࢝ΊΑ͏

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ΞδΣϯμ 1. Coroutineॳ৺ऀʹཱͪ͸͔ͩΔ೉ղͳఆٛͨͪ 2. Androidʹ͓͚ΔThreadͷ෮श 3. CoroutineͱThreadͷؔ܎ 4. Coroutineͷղܾ͢Δ՝୊

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Androidʹ͓͚ΔThreadͷ෮श Androidͷ̐ͭͷίϯϙʔωϯτͱϓϩηε ɾActivity ɾService ɾBroadcastReceiver ɾContent Providers ɹ (جຊతʹ) ΞϓϦ͸ҰͭͷϓϩηεΛىಈ͍ͯͯ͠ɺϚϧνεϨουͰಈ͘

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Androidʹ͓͚ΔThreadͷ෮श Androidʹ͓͚ΔThreadૢ࡞ͷݪଇ 1. Do not block the UI thread ɹඳը͕ࢭ·ΔͱΫϦςΟΧϧ 2. Do not access the Android UI toolkit from outside the UI thread ɹUI toolkit͸εϨουηʔϑͰ͸ແ͍ ɹ ࢀߟɿhttps://developer.android.com/guide/components/processes-and-threads

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21 Androidʹ͓͚ΔThreadͷ෮श Androidʹ͓͚ΔϚϧνεϨουͷ੍໿ ɾωοτϫʔΫॲཧ΍DBͷॻ͖ࠐΈͳͲΛߦ͏ࡍʹ͸ɺҟͳΔεϨου ʹॲཧΛ೚ͤΔඞཁ͕͋Δ ɾඳըॲཧͷࡍʹ͸UIεϨουʹॲཧΛ໭͢ඞཁ͕͋Δ

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22 ΞδΣϯμ 1. Coroutineॳ৺ऀʹཱͪ͸͔ͩΔ೉ղͳఆٛͨͪ 2. Androidʹ͓͚ΔThreadͷ෮श 3. CoroutineͱThreadͷؔ܎ 4. Coroutineͷղܾ͢Δ՝୊

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23 CoroutineͱThreadͷؔ܎ ͱΓ͋͑ͣಈ͔ͯ͠ΈΔ ࢀߟɿhttps://kotlinlang.org/docs/reference/coroutines/basics.html

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24 CoroutineͱThreadͷؔ܎ ͱΓ͋͑ͣಈ͔ͯ͠ΈΔ ࢀߟɿhttps://kotlinlang.org/docs/reference/coroutines/basics.html ࣮ߦ͢Δͱ…ʁ A. Start End Hello Stop B. Start Hello End Stop

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25 CoroutineͱThreadͷؔ܎ ͱΓ͋͑ͣಈ͔ͯ͠ΈΔ ࣮ߦ݁Ռ A. Start End Hello Stop ࢀߟɿhttps://kotlinlang.org/docs/reference/coroutines/basics.html

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26 CoroutineͱThreadͷؔ܎ ͱΓ͋͑ͣಈ͔ͯ͠ΈΔ ࣮ߦ݁Ռ Start End Hello Stop ࢀߟɿhttps://kotlinlang.org/docs/reference/coroutines/basics.html Coroutine

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27 CoroutineͱThreadͷؔ܎ ͱΓ͋͑ͣಈ͔ͯ͠ΈΔ ࣮ߦ݁Ռ Start End Hello Stop ࢀߟɿhttps://kotlinlang.org/docs/reference/coroutines/basics.html 1ඵதஅʂ Coroutine

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28 CoroutineͱThreadͷؔ܎ ͱΓ͋͑ͣಈ͔ͯ͠ΈΔ ࣮ߦ݁Ռ Start End Hello Stop ࢀߟɿhttps://kotlinlang.org/docs/reference/coroutines/basics.html Coroutine

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29 CoroutineͱThreadͷؔ܎ ͱΓ͋͑ͣಈ͔ͯ͠ΈΔ ࣮ߦ݁Ռ Start End Hello Stop ࢀߟɿhttps://kotlinlang.org/docs/reference/coroutines/basics.html ࠶։ Coroutine

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30 CoroutineͱThreadͷؔ܎ Ͳ͜Ͱಈ͍͍ͯΔͷ͔͔֬ΊΔ ࣮ߦ݁Ռ Start thread is main End thread is DefaultDispatcher-worker-1 Hello Stop

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31 CoroutineͱThreadͷؔ܎ Ͳ͜Ͱಈ͍͍ͯΔͷ͔͔֬ΊΔ ࣮ߦ݁Ռ Start thread is main End thread is DefaultDispatcher-worker-1 Hello Stop

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CoroutineͱThreadͷؔ܎ CoroutineɺThread্Ͱಈ͍͍ͯΔΜͩͶ (ࢸۃ౰ͨΓલͳ࿩Ͱ͸͋Δ)

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CoroutineͱThreadͷؔ܎ ͨ͘͞Μಈ͔ͯ͠ΈΔ ࢀߟɿLearning Coroutine in Action

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CoroutineͱThreadͷؔ܎ ͨ͘͞Μಈ͔ͯ͠ΈΔ ࢀߟɿLearning Coroutine in Action தஅΛࣔ͢म০ࢠ

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35 CoroutineͱThreadͷؔ܎ suspendम০ࢠ ࣮ߦ݁Ռ Start End Hello Stop ࢀߟɿhttps://kotlinlang.org/docs/reference/coroutines/basics.html 1ඵதஅʂ Coroutine

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36 CoroutineͱThreadͷؔ܎ ࢀߟɿhttps://kotlinlang.org/docs/reference/coroutines/basics.html suspendम০ࢠ தஅΛࣔ͢म০ࢠ

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37 CoroutineͱThreadͷؔ܎ ࢀߟɿhttps://kotlinlang.org/docs/reference/coroutines/basics.html 1ඵதஅʂ Coroutine

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38 CoroutineͱThreadͷؔ܎ ࢀߟɿhttps://kotlinlang.org/docs/reference/coroutines/basics.html ଓߦʂ ผεϨουͰ࣮ߦதʂ

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39 CoroutineͱThreadͷؔ܎ ࢀߟɿhttps://kotlinlang.org/docs/reference/coroutines/basics.html ࠶։

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CoroutineͱThreadͷؔ܎ ͨ͘͞Μಈ͔ͯ͠ΈΔ ࢀߟɿLearning Coroutine in Action தஅΛࣔ͢म০ࢠ

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CoroutineͱThreadͷؔ܎ ͨ͘͞Μಈ͔ͯ͠ΈΔ ࢀߟɿLearning Coroutine in Action

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CoroutineͱThreadͷؔ܎ ͨ͘͞Μಈ͔ͯ͠ΈΔ ࢀߟɿLearning Coroutine in Action ࣮ߦ݁Ռ 1 threads active at the start 4 threads active at the end Took 1031 ms

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CoroutineͱThreadͷؔ܎ ͨ͘͞Μಈ͔ͯ͠ΈΔ ࢀߟɿLearning Coroutine in Action ࣮ߦ݁Ռ 1 threads active at the start 4 threads active at the end Took 1031 ms 1ສݸͷίϧʔνϯʹରͯ͠εϨου3ͭ

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CoroutineͱThreadͷؔ܎ CoroutineͱThreadͷؔ܎ ͦΕͧΕͷCoroutine͸ThreadʹΞαΠϯ͞ΕΔɻ CoroutineΛ࢖͏ͱɺগͳ͍Threadͷੜ੒ͰฒߦॲཧΛߦ͏͜ͱ͕Մೳ

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CoroutineͱThreadͷؔ܎ ͦΕͧΕͷCoroutine͸ThreadʹΞαΠϯ͞ΕΔɻ CoroutineΛ࢖͏ͱɺগͳ͍Threadͷੜ੒ͰฒߦॲཧΛߦ͏͜ͱ͕Մೳ suspendम০ࢠΛ༻͍ͨίϧʔνϯͷதஅͱɺ࣮ߦεϨουͷղ์

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46 CoroutineͱThreadͷؔ܎ ͬͪ͜ͷํ͕Θ͔Γ΍͍͢ʁ Coroutines are light weight threads => Coroutine is a light way to do concurrency with threads

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ࢀߟ threads are to coroutines what CPU cores are to threads ࢀߟɿhttps//stackoverflow.com/questions/49606471/why-and-when-to-use-co-routines- instead-of-threads-in-android-using-kotlin-as-th Coroutineʹͱͬͯthreadͱ͸ɺ threadʹͱͬͯͷCPUͱಉ͡Α͏ͳ΋ͷͰ͋Δ

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48 ΞδΣϯμ 1. Coroutineॳ৺ऀʹཱͪ͸͔ͩΔ೉ղͳఆٛͨͪ 2. Androidʹ͓͚ΔThreadͷ෮श 3. CoroutineͱThreadͷؔ܎ 4. Coroutineͷղܾ͢Δ՝୊

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Coroutineͷղܾ͢Δ՝୊ Coroutineɺগͳ͍εϨουͰޮ཰తʹฒߦॲཧΛ͞͹͚Δʂ

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Coroutineͷղܾ͢Δ՝୊ Coroutineɺগͳ͍εϨουͰޮ཰తʹฒߦॲཧΛ͞͹͚Δʂ ͦ΋ͦ΋AndroidͰͦΜͳʹಉ࣌ʹ࣮ߦ͢Δ͜ͱ͋Δͷ…? ଞʹྑ͍͜ͱͳ͍ͷ…?

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Coroutineͷղܾ͢Δ՝୊ KotlinʹCoroutine͕ಋೖ͞ΕΔલͷ Android։ൃʹ͓͚Δඇಉظॲཧ ɾHandlerThread / AsyncTask ɾRxJava

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Coroutineͷղܾ͢Δ՝୊ HandlerThread / AsyncTask ࢀߟɿhttps://academy.realm.io/jp/posts/android-thread-looper-handler/

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Coroutineͷղܾ͢Δ՝୊ HandlerThread / AsyncTask ɾCallback hell ɾLifecycleʹ߹ΘͤͨϝϞϦ؅ཧ

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Coroutineͷղܾ͢Δ՝୊ RxJava

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Coroutineͷղܾ͢Δ՝୊ RxJava ίʔϧόοΫͷଟॏωετ΍ϝϞϦ؅ཧ໰୊͸ଟগղܾ͞Εͨ ͕ɺେ͛͞ ͦ΋ͦ΋Streamѻ͏ͨΊͷlibrary

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Coroutineͷղܾ͢Δ՝୊ Coroutine

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Coroutineͷղܾ͢Δ՝୊ Coroutine readableͰγϯϓϧͳඇಉظॲཧ ɾno more callback hell ɾno more rxͷཞ༻ ɾஞ࣍ॲཧͰͷهड़

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·ͱΊ ɾCoroutine is a light way to concurrency with threads ɾܰྔͰฒߦॲཧʂ ɾreadableͰγϯϓϧͳฒߦॲཧʂ

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·ͱΊ खΛಈ͔ͯ͠ྑ͍KotlinϥΠϑΛʂ https://kotlinlang.org/