Rewind & Replay: Kotlin 2.2が変えるCoroutine デバッグ最前線

Kotlin Fest2025の登壇資料です。

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1. ©2024 Theoria technologies All Rights Reserved. Rewind & Replay: Kotlin 2.2 ͕ม͑ΔCoroutine σόοά࠷લઢ 2025 11/01
2. ©2024 Theoria technologies All Rights Reserved. 2 ✓ Coroutineσόοά৽ػೳΛཧղ͢Δ ✓ Before/AfterͰ՝୊ղܾΛମײ͢Δ ✓ ໌೔͔Β࢖͑Δ࣮ફతͳ஌ݟ ࠓ೔ͷΰʔϧ Section 1
3. ©2024 Theoria technologies All Rights Reserved. 3 1. ΠϯτϩμΫγϣϯ 2. Coroutineσόοάͷʮҋʯ 3. ͳͥɺCoroutine͸Debug͕ࠔ೉ͳͷ͔ 4. Coroutineσόοάͷ5େվળ ໨࣍ Section 1
4. ©2024 Theoria technologies All Rights Reserved. 4 ࣗݾ঺հ Section 1 ςΦϦΞɾςΫϊϩδʔζגࣜձࣾ ɹɹMasayukiSuda ɹɹdaasuu
5. ©2024 Theoria technologies All Rights Reserved. 5 ೝ஌঱ͱͷ޲͖߹͍ํΛɺ ςΫϊϩδʔͰม͍͑ͯ͘ɻ Our Mission ྫ͑͹ɺϦεΫʹૣظʹؾ͖ͮɺରԠͰ͖Δ࢓૊ΈΛͭ͘Δɻ ͨͱ͑ൃ঱ͯ͠΋ͦͷਓΒ͍͠฻Β͠Λࢧ͑ΔαʔϏεΛಧ͚Δɻ ͲͷΑ͏ͳεςʔδͰ΋ɺ͝ຊਓ΍͝Ո଒ɺؔΘΔ͢΂ͯͷਓɺ ͻͱΓͻͱΓ͕ࣗ෼ʹ߹ͬͨํ๏Ͱೝ஌঱ͱ޲͖߹͏͜ͱ͕Ͱ͖ΔΑ͏ʹɻ ͦͯ͠ɺ ਓੜͷ࠷ޙͷॠؒ·Ͱɺ ࣗ෼Β͘͠"ੜ͖͖Δ"͜ͱ͕Ͱ͖ΔࣾձΛɺ ࣮ݱ͢ΔͨΊʹɻ
6. ©2024 Theoria technologies All Rights Reserved. 6 ೝ஌঱ϓϥοτϑΥʔϜͷίϯηϓτϝΠΩϯά͔ΒιϦϡʔγϣϯ։ൃɺ σϦόϦʔͷ֦େΛਪਐ͢Δɻ ITػೳձࣾͰ͸ͳ͘ɺࣄۀձࣾͱͯ͠ΤʔβΠͱڞ૑͢Δɻ Co-Creating with Eisai ҙࢥܾఆ ࣄۀਪਐ ࣗࣾ։ൃ ҩྍ࿈ܞ ઓུࡦఆ ࣗࣾ։ൃϓϩμΫτʹΑΔՁ஋ఏڙ ౤ࢿ ࣄۀ΁ͷ౤ࢿ ࣏ݧɾίϗʔτσʔλ΁ͷΞΫηε ωοτϫʔΫɾਓࡒఏڙ
7. ©2024 Theoria technologies All Rights Reserved. 7 Coroutineσόοάͷʮҋʯ Section 2
8. ©2024 Theoria technologies All Rights Reserved. 8 ͋ͳͨ΋ܦݧͨ͠͸ͣ Section 2 ʮͳͥ͜ͷCoroutine͕ࢭ·ͬͯΔʁʯ ʮͲ͜Ͱsuspendͨ͠ʁʯ ʮStack Trace్͕੾ΕͯΔ…ʯ ʮม਺ͷ஋͕ݟ͑ͳ͍…ʯ
9. ©2024 Theoria technologies All Rights Reserved. 9 ैདྷͷCoroutineσόοάͷ՝୊ Section 2 ❌ Stack Traceͷ෼அ ❌ ϩʔΧϧม਺ͷফࣦ ❌ εςοϓ࣮ߦͷෆ҆ఆ͞ ❌ ଟ਺ͷCoroutineͷঢ়ଶݕࠪͷࠔ೉͞
10. ©2024 Theoria technologies All Rights Reserved. 10 ՝୊1: Stack Traceͷ෼அ Section 2
11. ©2024 Theoria technologies All Rights Reserved. 11 ՝୊1: Stack Traceͷ෼அ Section 2
12. ©2024 Theoria technologies All Rights Reserved. 12 ՝୊1: Stack Traceͷ෼அ Section 2
13. ©2024 Theoria technologies All Rights Reserved. 13 ՝୊1: Stack Traceͷ෼அ Section 2
14. ©2024 Theoria technologies All Rights Reserved. 14 ՝୊1: Stack Traceͷ෼அ Section 2 Stack Trace͕b()Ͱ్੾ΕΔʂ
15. ©2024 Theoria technologies All Rights Reserved. 15 ࣮ࡍͷStack Traceʢैདྷʣ Section 2 b() Ҏ߱ͷ৘ใ͕ࣦΘΕΔ
16. ©2024 Theoria technologies All Rights Reserved. 16 ՝୊2: Debug࣮ߦ࣌ʹϩʔΧϧม਺ͷফࣦ Section 2
17. ©2024 Theoria technologies All Rights Reserved. 17 ՝୊2: Debug࣮ߦ࣌ʹϩʔΧϧม਺ͷফࣦ Section 2
18. ©2024 Theoria technologies All Rights Reserved. 18 ՝୊2: Debug࣮ߦ࣌ʹϩʔΧϧม਺ͷফࣦ Section 2
19. ©2024 Theoria technologies All Rights Reserved. 19 ՝୊3: εςοϓ࣮ߦͷෆ҆ఆ͞ Section 2 ϒϨʔΫϙΠϯτΛઃఆ Step Over/Into Λ࣮ߦ 👉 ҙਤͤͣผͷCoroutineʹॲཧ͕ඈͿ 👉 Ͳ͜Λ࣮ߦ͍ͯ͠Δ͔෼͔Βͳ͘ͳΔ
20. ©2024 Theoria technologies All Rights Reserved. 20 ՝୊3: εςοϓ࣮ߦͷෆ҆ఆ͞ Section 2
21. ©2024 Theoria technologies All Rights Reserved. 21 ՝୊3: εςοϓ࣮ߦͷෆ҆ఆ͞ Section 2
22. ©2024 Theoria technologies All Rights Reserved. 22 ՝୊3: εςοϓ࣮ߦͷෆ҆ఆ͞ Section 2
23. ©2024 Theoria technologies All Rights Reserved. 23 ՝୊4: ଟ਺ͷCoroutineͷঢ়ଶݕࠪͷࠔ೉͞ Section 2 Coroutine͸ܰྔͳͨΊଟ਺ੜ੒͞Ε͕ͪ ͔͠͠ 👉 ଟ͘ͷCoroutineঢ়ଶݕ͕ࠪࠔ೉ 👉 ͦΕͧΕͷCoroutineͷ໾ׂͷ೺Ѳ͕ࠔ೉
24. ©2024 Theoria technologies All Rights Reserved. 24 ՝୊4: ଟ਺ͷCoroutineͷঢ়ଶݕࠪͷࠔ೉͞ Section 2
25. ©2024 Theoria technologies All Rights Reserved. 25 σόοάͷݱ࣮ Section 2 ݁Ռ: • printlnσόοάʹཔΔ • ϩάΛେྔʹ࢓ࠐΉ • ࠶ݱʹ͕͔͔࣌ؒΔ • ຊ൪؀ڥͰͷτϥϒϧγϡʔτࠔ೉
26. ©2024 Theoria technologies All Rights Reserved. 26 Section 3 ͳͥɺCoroutine͸Debug͕ࠔ೉ͳͷ͔
27. ©2024 Theoria technologies All Rights Reserved. 27 suspend function Section 3 suspend function͸ී௨ͷؔ਺Ͱ͸ͳ͍
28. ©2024 Theoria technologies All Rights Reserved. 28 ίϯύΠϥͷ಺෦ॲཧ Section 3 - suspend ͸“ෳ਺ճεϦʔϓ/΢ΣΠΫΞοϓՄೳ”Ͱ͋Δ͜ͱΛίϯύΠϥʹ఻͑Δम০ࢠ - ͢΂ͯͷ suspend ؔ਺ʹ͸ίϯύΠϥ͕Ӆ͠Ҿ਺ `Continuation` Λ෇༩ - Continuation ͸தஅ఺ͷ“ଓ͖”Λදݱ͠ɼresume() Ͱ࣮ߦΛ࠶։ - Continuation ͸“ϩʔΧϧม਺ͷอଘྖҬ”ͱͯ͠΋࢖ΘΕΔ
29. ©2024 Theoria technologies All Rights Reserved. 29 Continuationͱ͸Կ͔ Section 3 - தஅ͞Ε࣮ͨߦϑϩʔͷ“εφοϓγϣοτ” - resume() ݺͼग़͠Ͱͦͷଓ͖͔Β࠶։ - νΣʔϯԽ͞Εɺݺͼग़ؔ͠܎ͷ෮ݩʹ΋ؔ༩ - ϩʔΧϧม਺ͷ஋Λอ࣋͢ΔͨΊͷετϨʔδ
30. ©2024 Theoria technologies All Rights Reserved. 30 ؔ਺͸εςʔτϚγϯʹม׵͞ΕΔ Section 3 - suspend ؔ਺͸“Կ౓΋ى͖Δ”Մೳੑ͕͋ΔͨΊɺίϯύΠϥ͕εςʔτϚγϯ΁ม׵ - ؔ਺ͷ։࢝/֤αεϖϯγϣϯϙΠϯτޙʹϥϕϧʢstateʣΛ෇༩ - ϥϕϧʹԠͯ͡ॲཧϒϩοΫΛ੾ସ͑Δ࣮૷΁มܗ
31. ©2024 Theoria technologies All Rights Reserved. 31 Code sample Section 3 suspend fun describe(identifier: String): String { val description = fetchDescription(identifier) val enhancedDescription = enhanceDescription(description) return enhancedDescription } suspend fun fetchDescription(identifier: String): String {} suspend fun enhanceDescription(description: String): String {}
32. ©2024 Theoria technologies All Rights Reserved. 32 Code sample Section 3 suspend fun describe(identifier: String, continuation: Continuation): String { }
33. ©2024 Theoria technologies All Rights Reserved. 33 Code sample Section 3 suspend fun describe(identifier: String, continuation: Continuation): String { val description = fetchDescription(identifier) val enhancedDescription = enhanceDescription(description) return enhancedDescription }
34. ©2024 Theoria technologies All Rights Reserved. 34 Code sample Section 3 suspend fun describe(identifier: String, continuation: Continuation): String { // label 0 -> first execution val description = fetchDescription(identifier) val enhancedDescription = enhanceDescription(description) return enhancedDescription }
35. ©2024 Theoria technologies All Rights Reserved. 35 Code sample Section 3 suspend fun describe(identifier: String, continuation: Continuation): String { // label 0 -> first execution val description = fetchDescription(identifier) // label 1 -> resuming val enhancedDescription = enhanceDescription(description) return enhancedDescription }
36. ©2024 Theoria technologies All Rights Reserved. 36 Code sample Section 3 suspend fun describe(identifier: String, continuation: Continuation): String { // label 0 -> first execution val description = fetchDescription(identifier) // label 1 -> resuming val enhancedDescription = enhanceDescription(description) // label 2 -> resuming and terminating return enhancedDescription }
37. ©2024 Theoria technologies All Rights Reserved. 37 Code sample Section 3 suspend fun describe(identifier: String, continuation: Continuation): String { when (stateMachine.label) { 0 -> { // label 0 -> first execution val description = fetchDescription(identifier) return } 1 -> { // label 1 -> resuming val enhancedDescription = enhanceDescription(description) return } 2 -> { // label 2 -> resuming and terminating return enhancedDescription } } }
38. ©2024 Theoria technologies All Rights Reserved. 38 Code sample Section 3 suspend fun describe(identifier: String, continuation: Continuation): String { when (stateMachine.label) { 0 -> { // label 0 -> first execution val description = fetchDescription(identifier) stateMachine.label = 1 return } 1 -> { // label 1 -> resuming val enhancedDescription = enhanceDescription(description) stateMachine.label = 2 return } 2 -> { // label 2 -> resuming and terminating return enhancedDescription } } }
39. ©2024 Theoria technologies All Rights Reserved. 39 Code sample Section 3 suspend fun describe(identifier: String, continuation: Continuation): String { when (stateMachine.label) { 0 -> { // label 0 -> first execution val description = fetchDescription(identifier) stateMachine.label = 1 return } 1 -> { // label 1 -> resuming val enhancedDescription = enhanceDescription(description) stateMachine.label = 2 return } 2 -> { // label 2 -> resuming and terminating return enhancedDescription } } }
40. ©2024 Theoria technologies All Rights Reserved. 40 Code sample Section 3 suspend fun describe(identifier: String, continuation: Continuation): String { when (stateMachine.label) { 0 -> { // label 0 -> first execution val description = fetchDescription(identifier) continuation.description = description continuation.identifier = null stateMachine.label = 1 return } 1 -> { // label 1 -> resuming val enhancedDescription = enhanceDescription(description) continuation.enhancedDescription = enhancedDescription continuation.description = null stateMachine.label = 2 return } 2 -> { // label 2 -> resuming and terminating return continuation.enhancedDescription } } }
41. ©2024 Theoria technologies All Rights Reserved. 41 Code sample Section 3 suspend fun describe(identifier: String, continuation: Continuation): String { when (stateMachine.label) { 0 -> { // label 0 -> first execution val description = fetchDescription(identifier) continuation.description = description continuation.identifier = null stateMachine.label = 1 return } 1 -> { // label 1 -> resuming val enhancedDescription = enhanceDescription(description) continuation.enhancedDescription = enhancedDescription continuation.description = null stateMachine.label = 2 return } 2 -> { // label 2 -> resuming and terminating return continuation.enhancedDescription } } }
42. ©2024 Theoria technologies All Rights Reserved. 42 ͳͥϩʔΧϧม਺͕ফ͑Δͷ͔ʢLiveness Analysisʣ Section 3 ίϯύΠϥ࠷దԽ
    
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    ϝϞϦϦʔΫ๷ࢭʢ௕࣌ؒεϦʔϓதʹڊେΦϒδΣΫτΛอ࣋͠ͳ͍ʣ
    
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    ͷσʔλΛอ࣋ͨ͠ม਺͕εϦʔϓ͠ଓ͚ΔࣄଶΛආ͚Δ
43. ©2024 Theoria technologies All Rights Reserved. 43 ࠷దԽΛ๷͙؆қࡦ: println Section 3 ϙΠϯτ
    
    ม਺Λ
    QSJOUMO
    ʹ౉͢ͱl࢖༻͞ΕΔzͨΊɺ࠷దԽͷର৅͔Β֎Ε΍͍͢
    
    σϝϦοτ
    ϩά͕૽͕͍͠ຊ൪ʹࠞೖ͠΍͍͢ύϑΥʔϚϯεӨڹ
44. ©2024 Theoria technologies All Rights Reserved. 44 ݱࡏ Section 3 Kotlin 2.2 IntelliJ IDEA 2025.1
45. ©2024 Theoria technologies All Rights Reserved. 45 Section 4 Coroutineσόοάͷ5େվળ
46. ©2024 Theoria technologies All Rights Reserved. 46 5େվળ Section 3 ✅ ϩʔΧϧม਺อ࣋ ✅ Stack TraceҰ෦෮ݩ ✅ εςοϓ࣮ߦ ✅ Async Stack Trace ✅ Coroutine View ※Kotlin 2.2ɺIDEA 2025.1ͷ૊Έ߹ΘͤͰ࣮ݱ
47. ©2024 Theoria technologies All Rights Reserved. 47 վળ1: ϩʔΧϧม਺อ࣋ Section 4
48. ©2024 Theoria technologies All Rights Reserved. 48 վળ2: Stack TraceҰ෦෮ݩ Section 4 Coroutine ScopeΛඈͼӽ͑ͨ৔߹ 👉 Ͳ͔͜Βݺ͹Ε͔ͨ௥੻Մೳ
49. ©2024 Theoria technologies All Rights Reserved. 49 վળ2: Stack TraceҰ෦෮ݩ Section 4
50. ©2024 Theoria technologies All Rights Reserved. 50 վળ2: Stack TraceҰ෦෮ݩ Section 4
51. ©2024 Theoria technologies All Rights Reserved. 51 վળ2: Stack TraceҰ෦෮ݩ Section 4
52. ©2024 Theoria technologies All Rights Reserved. 52 վળ2: Stack TraceҰ෦෮ݩ Section 4
53. ©2024 Theoria technologies All Rights Reserved. 53 վળ1: Stack TraceҰ෦෮ݩ Section 4 b() Ҏ߱ͷ৘ใ΋෮ݩ͞ΕͯΔ
54. ©2024 Theoria technologies All Rights Reserved. 54 վળ2: Stack TraceҰ෦෮ݩ Section 4 Coroutine ScopeΛ௒͑ͳͯ͘΋෮ݩ͢Δํ๏͸ͳ͍ʁ
55. ©2024 Theoria technologies All Rights Reserved. 55 վળ2: Stack Trace׬શ෮ݩ Section 4 ͋Γ·͢
56. ©2024 Theoria technologies All Rights Reserved. 56 վળ2: Stack Trace෮ݩ Section 4 Stack trace decoroutinator An open source library https://github.com/Anamorphosee/stacktrace-decoroutinator
57. ©2024 Theoria technologies All Rights Reserved. 57 վળ2: Stack trace decoroutinator Section 4 - Coroutineͷ“Wake upʢ࠶։ʣ”࣮૷Λ Java AgentͰஔ׵ - ࣮ߦ࣌ʹCoroutineͷݺͼग़͠νΣʔϯʹରԠ͢Δϝιου܈Λੜ੒ - ૬ޓݺͼग़͠Ͱ“࣮ελοΫ”෩ͷ࿈ͳΓΛܗ੒ͯ͠ྫ֎ʹࠞࡏ
58. ©2024 Theoria technologies All Rights Reserved. 58 վળ2: Stack trace decoroutinator Section 4 - Coroutine࠶։ͷλΠϛϯάͰ“decoroutination”༻ͷϑϨʔϜΛ஫ೖ - ੜ੒ϝιου͸“funA → funB → funC → ...”ͷΑ͏ʹ࿈࠯ - ྫ֎ൃੜ࣌ɺ௨ৗͷframeͱฒΜͰ“෮ݩ͞Εͨݺͼग़͠ݩ”͕stackʹදΕΔ
59. ©2024 Theoria technologies All Rights Reserved. 59 վળ2: Stack trace decoroutinator Section 4
60. ©2024 Theoria technologies All Rights Reserved. 60 վળ2: Stack trace decoroutinator Section 4
61. ©2024 Theoria technologies All Rights Reserved. 61 վળ2: Stack trace decoroutinator Section 4
62. ©2024 Theoria technologies All Rights Reserved. 62 վળ2: Stack trace decoroutinator Section 4
63. ©2024 Theoria technologies All Rights Reserved. 63 վળ2: Stack trace decoroutinator Section 4
64. ©2024 Theoria technologies All Rights Reserved. 64 վળ2: Stack trace decoroutinator Section 4
65. ©2024 Theoria technologies All Rights Reserved. 65 վળ2: Stack trace decoroutinator Section 4 dependencies { implementation(“dev.reformator.stacktracedecoroutinator:stacktrace-decoroutinator-jvm:2.5.7") }
66. ©2024 Theoria technologies All Rights Reserved. 66 վળ2: Stack trace decoroutinator Section 4
67. ©2024 Theoria technologies All Rights Reserved. 67 վળ2: Stack trace decoroutinator Section 4
68. ©2024 Theoria technologies All Rights Reserved. 68 վળ2: Stack trace decoroutinator Section 4 ஫ҙ఺: - ࣮ߦ࣌ͷΦʔόʔϔου͸খ͘͞ͳ͍ - ຊ൪ӡ༻Ͱ͸ඇਪ঑ɺσόοά༻్ʹݶఆ - ໰୊࠶ݱ΍ݪҼ௥੻ͷ“࠷ޙͷ੾Γࡳ”ͱͯ͠׆༻
69. ©2024 Theoria technologies All Rights Reserved. 69 վળ3: Coroutine୯ҐͰͷεςοϓ࣮ߦ੍ޚ Section 3 ಛఆͷCoroutine಺ͰσόοάΛܧଓ 👉 ผͷCoroutineʹඈ͹ͳ͍ 👉 suspendؔ਺΋εςοϓΦʔόʔՄೳ"
70. ©2024 Theoria technologies All Rights Reserved. 70 վળ3: εςοϓ࣮ߦ Section 4
71. ©2024 Theoria technologies All Rights Reserved. 71 վળ3: ରԠ͢Δσόοάૢ࡞ Section 4 ͜ͷػೳ͕࣮૷͞Ε͍ͯΔૢ࡞: • Step Over • Step Out • Smart Step Into • Run-to-Cursor
72. ©2024 Theoria technologies All Rights Reserved. 72 վળ4: Async Stack Trace Section 4 - IntelliJ IDEAʹ౥ࡌͷσόοΨػೳ - CoroutineΛؚΉ“ඇಉظλεΫ”ͷىݯʙݱࡏΛؔ࿈෇͚ͯදࣔ
73. ©2024 Theoria technologies All Rights Reserved. 73 Async Stack Trace Section 4
74. ©2024 Theoria technologies All Rights Reserved. 74 վળ5: Coroutine View Section 4 IntelliJ IDEA 2025.1ͷ৽͍͠πʔϧ΢Οϯυ΢ • શCoroutineͷঢ়ଶΛදࣔ • Suspend/Resumeཤྺ • ਌ࢠؔ܎ͷՄࢹԽ
75. ©2024 Theoria technologies All Rights Reserved. 75 Coroutine ViewͷεΫϦʔϯγϣοτ Section 4 σόοΨʔπʔϧ΢ΟϯυΡ಺ͷCoroutinesʹνΣοΫΛೖΕΔ
76. ©2024 Theoria technologies All Rights Reserved. 76 վળ5: Coroutine View Section 4
77. ©2024 Theoria technologies All Rights Reserved. 77 վળ5: Coroutine View Section 4
78. ©2024 Theoria technologies All Rights Reserved. 78 վળ5: Coroutine View Section 4
79. ©2024 Theoria technologies All Rights Reserved. 79 վળ5: Coroutine View Section 4
80. ©2024 Theoria technologies All Rights Reserved. 80 Section 3
81. ©2024 Theoria technologies All Rights Reserved. 81 վળ5: Coroutine View Section 4
82. ©2024 Theoria technologies All Rights Reserved. 82
83. ©2024 Theoria technologies All Rights Reserved. 83 Android ։ൃͷํ΁ Android StudioͰ͸😣😣😣 • Coroutine View • εςοϓ࣮ߦ • Async Stack Trace
84. ©2024 Theoria technologies All Rights Reserved. 84 Android ։ൃͷํ΁ Stack trace decoroutinator Android API 14 or higher
85. ©2024 Theoria technologies All Rights Reserved. 85 Special Thanks Debug Kotlin coroutines https://www.jetbrains.com/help/idea/debug-kotlin-coroutines.html Coroutine Debugging in IntelliJ IDEA | Alexey Merkulov https://www.youtube.com/watch?v=3vaAVtnrzAM Kotlin Coroutines - Debugging Tools Overview https://www.youtube.com/watch?v=InN1NzDNJrA Debugging the Future: Exploring Coroutine Debugger Tools | Nikita Nazarov https://www.youtube.com/watch?v=QomoVqZSXP0
86. ©2024 Theoria technologies All Rights Reserved. 86 We are hiring ! ͋ͳͨͷٕज़Ͱೝ஌঱ʹؔΘΔਓʑͷະདྷΛม͑·͠ΐ͏
87. ©2024 Theoria technologies All Rights Reserved. 87 End Of doc.