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

by Masayuki Suda

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©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

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©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

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©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

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©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 {}

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©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 }

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©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 }

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©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 }

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©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 }

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©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 } } }

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©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 } } }

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©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 } } }

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©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 } } }

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©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 } } }

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©2024 Theoria technologies All Rights Reserved. 42 ͳͥϩʔΧϧม਺͕ফ͑Δͷ͔ʢLiveness Analysisʣ Section 3 ίϯύΠϥ࠷దԽ -JWFOFTT"OBMZTJTʢੜଘੑ෼ੳʣͰlޙͷϒϩοΫͰ࢖ΘΕͳ͍zม਺Λݕग़ ࢖Θͳ͍ม਺͸$POUJOVBUJPO͔ΒψϧԽഉআʢσόοΨʹݟ͑ͳ͍ʣ ཧ༝ ϝϞϦϦʔΫ๷ࢭʢ௕࣌ؒεϦʔϓதʹڊେΦϒδΣΫτΛอ࣋͠ͳ͍ʣ ྫ5#ͷσʔλΛอ࣋ͨ͠ม਺͕εϦʔϓ͠ଓ͚ΔࣄଶΛආ͚Δ

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©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

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©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

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©2024 Theoria technologies All Rights Reserved. 65 վળ2: Stack trace decoroutinator Section 4 dependencies { implementation(“dev.reformator.stacktracedecoroutinator:stacktrace-decoroutinator-jvm:2.5.7") }

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©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

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