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1. ৮ͬͯΘ͔ΔCoroutine FiNC Technologies Inc. / Engineer Development Kensuke Izumi
2. ࣗݾ঺հ Kensuke Izumi Android Engineer @FiNC Kotlin / javascript / ruby Twitter: @izmeal2000
3. ͍͔ʹͯ͠๻͸reject͞Εͨͷ͔
4. ͍͔ʹͯ͠๻͸reject͞Εͨͷ͔ νʔϜ಺Ͱͷෳ਺ճͷϨϏϡʔΛܦͯ ϒϥογϡΞοϓ͞ΕͨCFP!
5. ͍͔ʹͯ͠๻͸reject͞Εͨͷ͔ ͗Γ͗Γ·Ͱ೪ͬͯमਖ਼ʹमਖ਼ΛॏͶͯSUBMIT!!! At 23:59 2018/10/21
6. ͍͔ʹͯ͠๻͸reject͞Εͨͷ͔
7. ͍͔ʹͯ͠๻͸reject͞Εͨͷ͔ Rejected by System
8. ΞδΣϯμ 1. Coroutineॳ৺ऀʹཱͪ͸͔ͩΔ೉ղͳఆٛͨͪ 2. Androidʹ͓͚ΔThreadͷ෮श 3. CoroutineͱThreadͷؔ܎ 4. Coroutineͷղܾ͢Δ՝୊
9. ΞδΣϯμ 1. Coroutineॳ৺ऀʹཱͪ͸͔ͩΔ೉ղͳఆٛͨͪ 2. Androidʹ͓͚ΔThreadͷ෮श 3. CoroutineͱThreadͷؔ܎ 4. Coroutineͷղܾ͢Δ՝୊
10. What is Coroutine?
11. What is Coroutine? Coroutines are light weight threads
12. What is Coroutine? Coroutines are light weight threads ?
13. ු͔ΜͰ͖ͨٙ໰ Coroutines are light weight threads ίϧʔνϯ͸ܰྔεϨου
14. ු͔ΜͰ͖ͨٙ໰ Coroutines are light weight threads CoroutineͬͯThreadͱର౳ʹൺֱͯ͠ྑ͍΋ͷͳͷʁ ݁ہJVMεϨου্Ͱ࣮ߦ͞ΕΔͷͰ͸ʁ
15. ͦ΋ͦ΋Threadͬͯɺɺɺ ๻͕Android։ൃΛ࢝Ίͨ౰࣌ͷঢ়گ ඇಉظॲཧʁɹRXʂ
16. ͦ΋ͦ΋Threadͬͯɺɺɺ ๻͕Android։ൃΛ࢝Ίͨ౰࣌ͷঢ়گ ඇಉظॲཧʁɹRXʂ Thread? observeOnͱ͔Ͱࢦఆ͢Δ΍ͭʂ
17. Threadͷࡶͳೝࣝ Threadͷ෮श͔Β࢝ΊΑ͏
18. ΞδΣϯμ 1. Coroutineॳ৺ऀʹཱͪ͸͔ͩΔ೉ղͳఆٛͨͪ 2. Androidʹ͓͚ΔThreadͷ෮श 3. CoroutineͱThreadͷؔ܎ 4. Coroutineͷղܾ͢Δ՝୊
19. Androidʹ͓͚ΔThreadͷ෮श Androidͷ̐ͭͷίϯϙʔωϯτͱϓϩηε ɾActivity ɾService ɾBroadcastReceiver ɾContent Providers ɹ (جຊతʹ) ΞϓϦ͸ҰͭͷϓϩηεΛىಈ͍ͯͯ͠ɺϚϧνεϨουͰಈ͘
20. 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
21. 21 Androidʹ͓͚ΔThreadͷ෮श Androidʹ͓͚ΔϚϧνεϨουͷ੍໿ ɾωοτϫʔΫॲཧ΍DBͷॻ͖ࠐΈͳͲΛߦ͏ࡍʹ͸ɺҟͳΔεϨου ʹॲཧΛ೚ͤΔඞཁ͕͋Δ ɾඳըॲཧͷࡍʹ͸UIεϨουʹॲཧΛ໭͢ඞཁ͕͋Δ
22. 22 ΞδΣϯμ 1. Coroutineॳ৺ऀʹཱͪ͸͔ͩΔ೉ղͳఆٛͨͪ 2. Androidʹ͓͚ΔThreadͷ෮श 3. CoroutineͱThreadͷؔ܎ 4. Coroutineͷղܾ͢Δ՝୊
23. 23 CoroutineͱThreadͷؔ܎ ͱΓ͋͑ͣಈ͔ͯ͠ΈΔ ࢀߟɿhttps://kotlinlang.org/docs/reference/coroutines/basics.html
24. 24 CoroutineͱThreadͷؔ܎ ͱΓ͋͑ͣಈ͔ͯ͠ΈΔ ࢀߟɿhttps://kotlinlang.org/docs/reference/coroutines/basics.html ࣮ߦ͢Δͱ…ʁ A. Start End Hello Stop B. Start Hello End Stop
25. 25 CoroutineͱThreadͷؔ܎ ͱΓ͋͑ͣಈ͔ͯ͠ΈΔ ࣮ߦ݁Ռ A. Start End Hello Stop ࢀߟɿhttps://kotlinlang.org/docs/reference/coroutines/basics.html
26. 26 CoroutineͱThreadͷؔ܎ ͱΓ͋͑ͣಈ͔ͯ͠ΈΔ ࣮ߦ݁Ռ Start End Hello Stop ࢀߟɿhttps://kotlinlang.org/docs/reference/coroutines/basics.html Coroutine
27. 27 CoroutineͱThreadͷؔ܎ ͱΓ͋͑ͣಈ͔ͯ͠ΈΔ ࣮ߦ݁Ռ Start End Hello Stop ࢀߟɿhttps://kotlinlang.org/docs/reference/coroutines/basics.html 1ඵதஅʂ Coroutine
28. 28 CoroutineͱThreadͷؔ܎ ͱΓ͋͑ͣಈ͔ͯ͠ΈΔ ࣮ߦ݁Ռ Start End Hello Stop ࢀߟɿhttps://kotlinlang.org/docs/reference/coroutines/basics.html Coroutine
29. 29 CoroutineͱThreadͷؔ܎ ͱΓ͋͑ͣಈ͔ͯ͠ΈΔ ࣮ߦ݁Ռ Start End Hello Stop ࢀߟɿhttps://kotlinlang.org/docs/reference/coroutines/basics.html ࠶։ Coroutine
30. 30 CoroutineͱThreadͷؔ܎ Ͳ͜Ͱಈ͍͍ͯΔͷ͔͔֬ΊΔ ࣮ߦ݁Ռ Start thread is main End thread is DefaultDispatcher-worker-1 Hello Stop
31. 31 CoroutineͱThreadͷؔ܎ Ͳ͜Ͱಈ͍͍ͯΔͷ͔͔֬ΊΔ ࣮ߦ݁Ռ Start thread is main End thread is DefaultDispatcher-worker-1 Hello Stop
32. CoroutineͱThreadͷؔ܎ CoroutineɺThread্Ͱಈ͍͍ͯΔΜͩͶ (ࢸۃ౰ͨΓલͳ࿩Ͱ͸͋Δ)
33. CoroutineͱThreadͷؔ܎ ͨ͘͞Μಈ͔ͯ͠ΈΔ ࢀߟɿLearning Coroutine in Action
34. CoroutineͱThreadͷؔ܎ ͨ͘͞Μಈ͔ͯ͠ΈΔ ࢀߟɿLearning Coroutine in Action தஅΛࣔ͢म০ࢠ
35. 35 CoroutineͱThreadͷؔ܎ suspendम০ࢠ ࣮ߦ݁Ռ Start End Hello Stop ࢀߟɿhttps://kotlinlang.org/docs/reference/coroutines/basics.html 1ඵதஅʂ Coroutine
36. 36 CoroutineͱThreadͷؔ܎ ࢀߟɿhttps://kotlinlang.org/docs/reference/coroutines/basics.html suspendम০ࢠ தஅΛࣔ͢म০ࢠ
37. 37 CoroutineͱThreadͷؔ܎ ࢀߟɿhttps://kotlinlang.org/docs/reference/coroutines/basics.html 1ඵதஅʂ Coroutine
38. 38 CoroutineͱThreadͷؔ܎ ࢀߟɿhttps://kotlinlang.org/docs/reference/coroutines/basics.html ଓߦʂ ผεϨουͰ࣮ߦதʂ
39. 39 CoroutineͱThreadͷؔ܎ ࢀߟɿhttps://kotlinlang.org/docs/reference/coroutines/basics.html ࠶։
40. CoroutineͱThreadͷؔ܎ ͨ͘͞Μಈ͔ͯ͠ΈΔ ࢀߟɿLearning Coroutine in Action தஅΛࣔ͢म০ࢠ
41. CoroutineͱThreadͷؔ܎ ͨ͘͞Μಈ͔ͯ͠ΈΔ ࢀߟɿLearning Coroutine in Action
42. CoroutineͱThreadͷؔ܎ ͨ͘͞Μಈ͔ͯ͠ΈΔ ࢀߟɿLearning Coroutine in Action ࣮ߦ݁Ռ 1 threads active at the start 4 threads active at the end Took 1031 ms
43. CoroutineͱThreadͷؔ܎ ͨ͘͞Μಈ͔ͯ͠ΈΔ ࢀߟɿLearning Coroutine in Action ࣮ߦ݁Ռ 1 threads active at the start 4 threads active at the end Took 1031 ms 1ສݸͷίϧʔνϯʹରͯ͠εϨου3ͭ
44. CoroutineͱThreadͷؔ܎ CoroutineͱThreadͷؔ܎ ͦΕͧΕͷCoroutine͸ThreadʹΞαΠϯ͞ΕΔɻ CoroutineΛ࢖͏ͱɺগͳ͍Threadͷੜ੒ͰฒߦॲཧΛߦ͏͜ͱ͕Մೳ
45. CoroutineͱThreadͷؔ܎ ͦΕͧΕͷCoroutine͸ThreadʹΞαΠϯ͞ΕΔɻ CoroutineΛ࢖͏ͱɺগͳ͍Threadͷੜ੒ͰฒߦॲཧΛߦ͏͜ͱ͕Մೳ suspendम০ࢠΛ༻͍ͨίϧʔνϯͷதஅͱɺ࣮ߦεϨουͷղ์
46. 46 CoroutineͱThreadͷؔ܎ ͬͪ͜ͷํ͕Θ͔Γ΍͍͢ʁ Coroutines are light weight threads => Coroutine is a light way to do concurrency with threads
47. 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
48. 48 ΞδΣϯμ 1. Coroutineॳ৺ऀʹཱͪ͸͔ͩΔ೉ղͳఆٛͨͪ 2. Androidʹ͓͚ΔThreadͷ෮श 3. CoroutineͱThreadͷؔ܎ 4. Coroutineͷղܾ͢Δ՝୊
49. Coroutineͷղܾ͢Δ՝୊ Coroutineɺগͳ͍εϨουͰޮ཰తʹฒߦॲཧΛ͞͹͚Δʂ
50. Coroutineͷղܾ͢Δ՝୊ Coroutineɺগͳ͍εϨουͰޮ཰తʹฒߦॲཧΛ͞͹͚Δʂ ͦ΋ͦ΋AndroidͰͦΜͳʹಉ࣌ʹ࣮ߦ͢Δ͜ͱ͋Δͷ…? ଞʹྑ͍͜ͱͳ͍ͷ…?
51. Coroutineͷղܾ͢Δ՝୊ KotlinʹCoroutine͕ಋೖ͞ΕΔલͷ Android։ൃʹ͓͚Δඇಉظॲཧ ɾHandlerThread / AsyncTask ɾRxJava
52. Coroutineͷղܾ͢Δ՝୊ HandlerThread / AsyncTask ࢀߟɿhttps://academy.realm.io/jp/posts/android-thread-looper-handler/
53. Coroutineͷղܾ͢Δ՝୊ HandlerThread / AsyncTask ɾCallback hell ɾLifecycleʹ߹ΘͤͨϝϞϦ؅ཧ
54. Coroutineͷղܾ͢Δ՝୊ RxJava
55. Coroutineͷղܾ͢Δ՝୊ RxJava ίʔϧόοΫͷଟॏωετ΍ϝϞϦ؅ཧ໰୊͸ଟগղܾ͞Εͨ ͕ɺେ͛͞ ͦ΋ͦ΋Streamѻ͏ͨΊͷlibrary
56. Coroutineͷղܾ͢Δ՝୊ Coroutine
57. Coroutineͷղܾ͢Δ՝୊ Coroutine readableͰγϯϓϧͳඇಉظॲཧ ɾno more callback hell ɾno more rxͷཞ༻ ɾஞ࣍ॲཧͰͷهड़
58. ·ͱΊ ɾCoroutine is a light way to concurrency with threads ɾܰྔͰฒߦॲཧʂ ɾreadableͰγϯϓϧͳฒߦॲཧʂ
59. ·ͱΊ खΛಈ͔ͯ͠ྑ͍KotlinϥΠϑΛʂ https://kotlinlang.org/