Kotlin Multiplatform MobileのおさらいとABEMAでのマルチプラットフォーム対応 | CA BASE NEXT 2022

https://ca-base-next.cyberagent.co.jp/2022/sessions/kmm-abema/

近年，技術的なトレンドとしてKMM（Kotlin Multiplatform Mobile）やFlutter，React Nativeといったマルチプラットフォーム・クロスプラットフォーム技術が注目を浴びています。
Kotlinは2018年にリリースしたKotlin 1.3から，AndroidとiOSを含む様々なプラットフォーム間でのコードの共通化が可能になり，今年（2022年）にはKMMのベータ版リリースが予定されています。

様々なプラットフォームにサービスを展開しているABEMAでも，このKMMによってプラットフォーム間でのコードの共通化に取り組んでいます。

このセッションでは，特にモバイルプラットフォームにフォーカスを当ててKotlin Multiplatformのこれまでを振り返りつつ，ABEMAにおけるKMMの活用事例や開発している中での様々な知見を紹介します。

Transcript

1. ᅳࢣ ੣໵ 2018೥౓ ৽ଔೖࣾ גࣜձࣾAbemaTV ։ൃຊ෦ NativeνʔϜ @ronnnnn_jp @ronnnnn
2. ᅳࢣ ੣໵ 2018೥౓ ৽ଔೖࣾ גࣜձࣾAbemaTV ։ൃຊ෦ NativeνʔϜ @ronnnnn_jp @ronnnnn
3. 1. Kotlin Multiplatform MobileʢKMMʣͱ͸ 2. Kotlin Multiplatformͷ͜Ε·Ͱ 3. Kotlin Multiplatformͷ࢓૊Έ 4. νʔϜͰಋೖɾӡ༻͍ͯ͘͠ʹ͸ 5. KMMͷ՝୊ͱকདྷੑ 6. ࠷ۙͷτϐοΫε
4. Kotlin Multiplatform Mobile ʢKMMʣͱ͸
5. Kotlin Multiplatform? • Kotlin by JetBrains • ୯ҰͷιʔείʔυͰෳ਺ϓϥοτϑΥʔϜͷΞϓϦέʔ γϣϯ΍ϥΠϒϥϦΛ։ൃͰ͖Δٕज़ https://kotlinlang.org
6. Kotlin Multiplatform?🤔 Kotlin Multiplatform Project (KMP)?🤔 Kotlin Multiplatform Mobile (KMM)?🤔
7. Kotlin Multiplatform / KMP / KMM • KotlinʹΑͬͯෳ਺ϓϥοτϑΥʔϜͷ։ൃΛߦ͏ٕज़΍ ΤίγεςϜશମ Kotlin Multiplatform Kotlin Multiplatform Project (KMP) • Kotlin MultiplatformΛ༻͍ͯ։ൃ͞ΕΔϓϩδΣΫτ
8. Kotlin Multiplatform Mobile (KMM)? 🤝 https://youtu.be/PW-jkOLucjM?t=274 ⚙ Kotlin Multiplatform Multiplatform Gradle DSL Kotlin + Kotlin/JVM + Kotlin/Native + … Android Studio Plugin + CocoaPods integration + … 📱 Mobile Features SDK for cross-platform mobile development OFFICIAL
9. • KotlinͷڧྗͳAPIΛ׆༻ͯ͠ιʔείʔυΛڞ௨ԽͰ͖Δ • ֤ϓϥοτϑΥʔϜಛ༗ͷAPI΋΄ͱΜͲར༻Ͱ͖Δ • Ұ෦ϓϥοτϑΥʔϜΛআ͍ͯɼUI·Ͱڞ௨ԽͰ͖Δ • ର৅ϓϥοτϑΥʔϜ΋ଟ͍ • HTTPɼγϦΞϥΠζɼඇಉظॲཧͳͲ։ൃʹ͔ܽͤͳ͍ϥΠϒϥϦΛJetBrains͕ఏڙɾ ϝϯςφϯε͍ͯ͠Δ • খ͘͞ಋೖΛਐΊΒΕΔ • ϥΠϒϥϦͱͯ͠഑෍͢Δ͜ͱ΋Ͱ͖Δ Kotlin Multiplatform΍KMMͷϝϦοτ
10. Flutter΍UnityͳͲͱͷҧ͍͸ʁ • ֤ϓϥοτϑΥʔϜͰΞϓϦέʔγϣϯ͕ϥϯλΠϜͰಈ ࡞͢Δ࣮ߦ؀ڥΛඞཁͱ͢Δ • UI·Ͱڞ௨Խ͢Δ͜ͱ͕Մೳ Flutter, Unity… Kotlin Multiplatform • ಛఆͷ࣮ߦ؀ڥΛඞཁͱ͠ͳ͍ • KotlinΛ֤ϓϥοτϑΥʔϜͰಈ࡞͢ΔNativeίʔυʹม ׵͢Δ • ݱ࣌఺Ͱ͸iOSͷUIڞ௨ԽΛެ͕ࣜαϙʔτ͍ͯ͠ͳ͍
11. Kotlin Multiplatformͷ͜Ε·Ͱ
12. Kotlin 1.1 2016/02 Kotlin 1.2 2017/11 Kotlin 1.3 2018/10 Kotlin 1.4 2020/08 Kotlin 1.5 2021/05 Kotlin 1.6 2021/11 Kotlin 1.7 2022/06 KotlinΛJSʹίϯύΠϧ͢ΔػೳʢKotlin/JSʣ͕Stableʹ JVMͱJS؀ڥͷιʔείʔυڞ௨Խ͕Մೳʹ Kotlin/Native Beta (v1.0.1) Kotlin Multiplatform Mobile Alpha Hierarchical project structure Kotlin NativeͷύϑΥʔϚϯεվળ Experimental new memory manager Alpha new memory manager
13. Kotlin 1.1 2016/02 Kotlin 1.2 2017/11 Kotlin 1.3 2018/10 Kotlin 1.4 2020/08 Kotlin 1.5 2021/05 Kotlin 1.6 2021/11 Kotlin 1.7 2022/06 KotlinΛJSʹίϯύΠϧ͢Δػೳ(Kotlin/JS)͕Stableʹ JVMͱJS؀ڥͷιʔείʔυڞ௨Խ͕Մೳʹ Kotlin/Native Beta (v1.0.1) Kotlin Multiplatform Mobile Alpha Hierarchical project structure Kotlin NativeͷύϑΥʔϚϯεվળ Experimental new memory manager Alpha new memory manager https://blog.jetbrains.com/kotlin/2017/11/kotlin-1-2-released/
14. Kotlin 1.1 2016/02 Kotlin 1.2 2017/11 Kotlin 1.3 2018/10 Kotlin 1.4 2020/08 Kotlin 1.5 2021/05 Kotlin 1.6 2021/11 Kotlin 1.7 2022/06 KotlinΛJSʹίϯύΠϧ͢Δػೳ(Kotlin/JS)͕Stableʹ JVMͱJS؀ڥͷιʔείʔυڞ௨Խ͕Մೳʹ Kotlin/Native Beta (v1.0.1) Kotlin Multiplatform Mobile Alpha Hierarchical project structure Kotlin NativeͷύϑΥʔϚϯεվળ Experimental new memory manager Alpha new memory manager https://youtu.be/3uVUDsoE_5U?t=220
 https://blog.jetbrains.com/kotlin/2020/08/kotlin-multiplatform-mobile-goes-alpha/
15. Kotlin 1.1 2016/02 Kotlin 1.2 2017/11 Kotlin 1.3 2018/10 Kotlin 1.4 2020/08 Kotlin 1.5 2021/05 Kotlin 1.6 2021/11 Kotlin 1.7 2022/06 KotlinΛJSʹίϯύΠϧ͢Δػೳ(Kotlin/JS)͕Stableʹ JVMͱJS؀ڥͷιʔείʔυڞ௨Խ͕Մೳʹ Kotlin/Native Beta (v1.0.1) Kotlin Multiplatform Mobile Alpha Hierarchical project structure Kotlin NativeͷύϑΥʔϚϯεվળ Experimental new memory manager Alpha new memory manager https://blog.jetbrains.com/kotlin/2021/08/try-the-new-kotlin-native-memory-manager-development-preview/
16. https://youtu.be/3uVUDsoE_5U?t=303
17. https://blog.jetbrains.com/kotlin/2022/05/kotlin-multiplatform-mobile-beta-roadmap-update/ we have postponed Kotlin Multiplatform Mobile Beta until the memory model becomes the default, which we expect to be the case no later than autumn 2022.
18. https://youtu.be/LE-Dy9XCLxk?t=586
19. https://kotlinlang.org/docs/components-stability.html#current-stability-of-kotlin-components
20. Kotlin Multiplatformͷ࢓૊Έ
21. How Kotlin Multiplatform works • KotlinͷίϯύΠϥʹ͸FrontendͱBackend͕͋ Γɼڞ௨ͷFrontendͰதؒදݱʹม׵ޙɼ֤ϓϥοτ ϑΥʔϜͷBackendΛ௨ͯ͡όΠφϦʹม׵͞ΕΔ • ঃʑʹҠߦத 🏃 K2 Compiler https://youtu.be/3uVUDsoE_5U?t=303 Kotlin Ecosystem • ϓϥοτϑΥʔϜڞ௨ͷϥΠϒϥϦ΍API • + ϓϥοτϑΥʔϜݻ༗ͷAPI • Kotlin/JVM, Kotlin/JS, Kotlin/Wasm, Kotlin/Native
22. Code sharing • commonιʔεηοτʹڞ௨ϓϥοτϑΥʔϜͷ࣮૷Λஔ ͘͜ͱ͕Ͱ͖Δ • ϓϥοτϑΥʔϜಛ༗ͷιʔεηοτ΋࣋ͯΔ • Hierarchical project structureʹΑͬͯɼ͍ۙ؀ڥͷϓ ϥοτϑΥʔϜΛڞ௨Խͨ͠ιʔεηοτ΋࡞ΕΔ https://kotlinlang.org/docs/multiplatform.html#how-kotlin-multiplatform-works
23. Project Structure Android޲͚ͷιʔεηοτ ϓϥοτϑΥʔϜڞ௨ιʔεηοτ iOS޲͚ͷιʔεηοτ
24. expect/actual • commonιʔεηοτʹϓϥοτϑΥʔϜ͝ͱʹ࣮૷ͷҟͳ ΔΫϥεɼؔ਺ɼϓϩύςΟͳͲΛexpectΛ༻͍ͯఆٛͰ͖ Δ • ֤ϓϥοτϑΥʔϜͷιʔεηοτʹactualΛ༻͍࣮ͯ૷ৄࡉ Λهड़͢Δ • commonιʔεηοτ͚ͩͰͳ͘ɼ؀ڥͷ͍ۙϓϥοτ ϑΥʔϜΛ·ͱΊͨιʔεηοτʹ΋expectΛ༻͍ͨఆ͕ٛՄ ೳ https://kotlinlang.org/docs/multiplatform-connect-to-apis.html ϓϥοτϑΥʔϜݻ༗ͷAPI
25. Target platforms • JVM • JS (browser/Node.js) • Android • Android NDK (ARM32/ARM64/x86/x86_64) • iOS (ARM32/ARM64/iOS simulator) • watchOS (ARM32/ARM64/watchOS simulator) • tvOS (ARM64/tvOS simulator) • macOS (x86_64/Apple Silicon) • Linux (ARM32/ARM64/MIPS/mipsel/x86_64) • Windows (32-bit Windows/64-bit Windows) • WebAssembly https://kotlinlang.org/docs/multiplatform-dsl-reference.html#targets
26. Build configuration kotlin { android() listOf( iosX64(), iosArm64(), iosSimulatorArm64() ).forEach { it.binaries.framework { baseName = "base" } } sourceSets { val commonMain by getting { dependencies { // … } } val commonTest by getting val androidMain by getting val androidTest by getting val iosX64Main by getting val iosArm64Main by getting val iosSimulatorArm64Main by getting val iosMain by creating { dependsOn(commonMain) iosX64Main.dependsOn(this) iosArm64Main.dependsOn(this) iosSimulatorArm64Main.dependsOn(this) } val iosX64Test by getting val iosArm64Test by getting val iosSimulatorArm64Test by getting val iosTest by creating { dependsOn(commonTest) iosX64Test.dependsOn(this) iosArm64Test.dependsOn(this) iosSimulatorArm64Test.dependsOn(this) } } }
27. Build configuration kotlin { android() listOf( iosX64(), iosArm64(), iosSimulatorArm64() ).forEach { it.binaries.framework { baseName = "base" } } sourceSets { val commonMain by getting { dependencies { // … } } val commonTest by getting val androidMain by getting val androidTest by getting val iosX64Main by getting val iosArm64Main by getting val iosSimulatorArm64Main by getting val iosMain by creating { dependsOn(commonMain) iosX64Main.dependsOn(this) iosArm64Main.dependsOn(this) iosSimulatorArm64Main.dependsOn(this) } val iosX64Test by getting val iosArm64Test by getting val iosSimulatorArm64Test by getting val iosTest by creating { dependsOn(commonTest) iosX64Test.dependsOn(this) iosArm64Test.dependsOn(this) iosSimulatorArm64Test.dependsOn(this) } } } λʔήοτϓϥοτϑΥʔϜͷࢦఆ
28. Build configuration kotlin { android() listOf( iosX64(), iosArm64(), iosSimulatorArm64() ).forEach { it.binaries.framework { baseName = "base" } } sourceSets { val commonMain by getting { dependencies { // implementation(…) } } val commonTest by getting val androidMain by getting val androidTest by getting val iosX64Main by getting val iosArm64Main by getting val iosSimulatorArm64Main by getting val iosMain by creating { dependsOn(commonMain) iosX64Main.dependsOn(this) iosArm64Main.dependsOn(this) iosSimulatorArm64Main.dependsOn(this) } val iosX64Test by getting val iosArm64Test by getting val iosSimulatorArm64Test by getting val iosTest by creating { dependsOn(commonTest) iosX64Test.dependsOn(this) iosArm64Test.dependsOn(this) iosSimulatorArm64Test.dependsOn(this) } } } ґଘؔ܎ͳͲͷઃఆ ※ ґଘ͢ΔϥΠϒϥϦଆͰɼ λʔήοτͱͳΔϓϥοτϑΥʔ ϜʹରԠ͍ͯ͠ͳ͍ͱ͍͚ͳ͍
29. Build configuration kotlin { android() listOf( iosX64(), iosArm64(), iosSimulatorArm64() ).forEach { it.binaries.framework { baseName = "base" } } sourceSets { val commonMain by getting { dependencies { // implementation(…) } } val commonTest by getting val androidMain by getting val androidTest by getting val iosX64Main by getting val iosArm64Main by getting val iosSimulatorArm64Main by getting val iosMain by creating { dependsOn(commonMain) iosX64Main.dependsOn(this) iosArm64Main.dependsOn(this) iosSimulatorArm64Main.dependsOn(this) } val iosX64Test by getting val iosArm64Test by getting val iosSimulatorArm64Test by getting val iosTest by creating { dependsOn(commonTest) iosX64Test.dependsOn(this) iosArm64Test.dependsOn(this) iosSimulatorArm64Test.dependsOn(this) } } } ϥΠϒϥϦͷґଘؔ܎ ※ commonͰґଘ͍ͯ͠ΔϥΠϒ ϥϦ͕֤ϓϥοτϑΥʔϜʹର Ԡ͍ͯ͠Ε͹ɼϓϥοτϑΥʔ ϜผʹґଘΛॻ͘ඞཁ͸ͳ͍
30. Build configuration kotlin { android() listOf( iosX64(), iosArm64(), iosSimulatorArm64() ).forEach { it.binaries.framework { baseName = "base" } } sourceSets { val commonMain by getting { dependencies { // implementation(…) } } val commonTest by getting val androidMain by getting val androidTest by getting val iosX64Main by getting val iosArm64Main by getting val iosSimulatorArm64Main by getting val iosMain by creating { dependsOn(commonMain) iosX64Main.dependsOn(this) iosArm64Main.dependsOn(this) iosSimulatorArm64Main.dependsOn(this) } val iosX64Test by getting val iosArm64Test by getting val iosSimulatorArm64Test by getting val iosTest by creating { dependsOn(commonTest) iosX64Test.dependsOn(this) iosArm64Test.dependsOn(this) iosSimulatorArm64Test.dependsOn(this) } } } ιʔεηοτಉ࢜ͷґଘؔ܎
31. Build configuration kotlin { android { compilations.all { kotlinOptions.jvmTarget = "1.8" } publishAllLibraryVariants() } ios { binaries.framework { baseName = "base" } } // ... } • ෳ਺λʔήοτͷγϣʔτΧοτ΋༻ҙ͞Ε͍ͯΔ • ios (iosArm64/iosX64) • tvos (tvosArm64/tvosX64) • watchOS (watchosArm32/watchosArm64/watchosX64) • xxxSimulatorArm64͸ݱঢ়ؚ·Ε͍ͯͳ͍
32. νʔϜͰಋೖɾӡ༻͍ͯ͘͠ʹ͸
33. Kotlin΍Kotlin MultiplatformΛ஌Δ • ެࣜυΩϡϝϯτ • ެࣜϒϩά • YouTubeνϟϯωϧ • Slack • Twitter • reddit • ϋϯζΦϯ • αϯϓϧϓϩδΣΫτ • …
34. Kotlin΍Kotlin MultiplatformΛ஌Δ • ެࣜυΩϡϝϯτ • ެࣜϒϩά • YouTubeνϟϯωϧ • Slack • Twitter • reddit • ϋϯζΦϯ • αϯϓϧϓϩδΣΫτ • … • ެࣜυΩϡϝϯτ • ެࣜϒϩά • YouTubeνϟϯωϧ • Slack • Twitter • reddit
35. Kotlin΍Kotlin MultiplatformΛ஌Δ • ެࣜυΩϡϝϯτ • ެࣜϒϩά • YouTubeνϟϯωϧ • Slack • Twitter • reddit • ϋϯζΦϯ • αϯϓϧϓϩδΣΫτ • … • ϋϯζΦϯ • αϯϓϧϓϩδΣΫτ
36. Ͳ͏ಋೖ͍͔ͯ͘͠Λߟ͑Δ https://youtrack.jetbrains.com/issue/KT-49521 • ϞϊϨϙʁϥΠϒϥϦʁ • Ͳ͜Λڞ௨Խ͢Δʁ • ΞʔΩςΫνϟ • ϓϩδΣΫτͷߏ੒ • ϥΠϒϥϦબఆ • ςετͷํ਑
37. Ͳ͏ಋೖ͍͔ͯ͘͠Λߟ͑Δ https://www.youtube.com/channel/UCYvmsuoQ32tVY6MpOYhr5jA/videos • ϞϊϨϙʁϥΠϒϥϦʁ • Ͳ͜Λڞ௨Խ͢Δʁ • ΞʔΩςΫνϟ • ϓϩδΣΫτͷߏ੒ • ϥΠϒϥϦબఆ • ςετͷํ਑ ABEMAͷࣄྫ
38. νʔϜΛઆಘ͢Δ • έʔεελσΟ https://kotlinlang.org/lp/mobile/case-studies/
39. ϝϯόʔͷࢀೖϋʔυϧΛԼ͛Δ • υΩϡϝϯςʔγϣϯ • ษڧձ
41. KMMͷ՝୊ͱকདྷੑ
42. KMMͷ՝୊ͱকདྷੑ • ͍͔ͭ͘ͷϓϥοτϑΥʔϜͰ͸UI·Ͱڞ௨Խ͕೉͍͠ • StableͰͳ͍ͷͰϓϩδΣΫτશମͷେ͖ͳมߋ͕ඞཁͱͳΔ৔߹͕͋Δ • Swiftͱͷޓ׵ੑͰਏ͍͜ͱ͕… • Kotlin/NativeͷϏϧυ͕࣌ؒ௕͍ • ίϛϡχςΟ͕·ͩൺֱతখ͍͔͞΋ʁ
43. • ͍͔ͭ͘ͷϓϥοτϑΥʔϜͰ͸UI·Ͱڞ௨Խ͕೉͍͠ • StableͰͳ͍ͷͰϓϩδΣΫτશମͷେ͖ͳมߋ͕ඞཁͱͳΔ৔߹͕͋Δ • Swiftͱͷޓ׵ੑͰਏ͍͜ͱ͕… • Kotlin/NativeͷϏϧυ͕࣌ؒ௕͍ • ίϛϡχςΟ͕·ͩൺֱతখ͍͔͞΋ʁ • ͍͔ͭ͘ͷϓϥοτϑΥʔϜͰ͸UI·Ͱڞ௨Խ͕೉͍͠ FUTURE? KMMͷ՝୊ͱকདྷੑ
44. • ͍͔ͭ͘ͷϓϥοτϑΥʔϜͰ͸UI·Ͱڞ௨Խ͕೉͍͠ • StableͰͳ͍ͷͰϓϩδΣΫτશମͷେ͖ͳมߋ͕ඞཁͱͳΔ৔߹͕͋Δ • Swiftͱͷޓ׵ੑͰਏ͍͜ͱ͕… • Kotlin/NativeͷϏϧυ͕࣌ؒ௕͍ • ίϛϡχςΟ͕·ͩൺֱతখ͍͔͞΋ʁ FUTURE? • Swiftͱͷޓ׵ੑͰਏ͍͜ͱ͕… https://youtrack.jetbrains.com/issue/KT-49521 KMMͷ՝୊ͱকདྷੑ
45. • ͍͔ͭ͘ͷϓϥοτϑΥʔϜͰ͸UI·Ͱڞ௨Խ͕೉͍͠ • StableͰͳ͍ͷͰϓϩδΣΫτશମͷେ͖ͳมߋ͕ඞཁͱͳΔ৔߹͕͋Δ • Swiftͱͷޓ׵ੑͰਏ͍͜ͱ͕… • Kotlin/NativeͷϏϧυ͕࣌ؒ௕͍ • ίϛϡχςΟ͕·ͩൺֱతখ͍͔͞΋ʁ KEEP GOING https://youtrack.jetbrains.com/issue/KT-49521 • Kotlin/NativeͷϏϧυ͕࣌ؒ௕͍ KMMͷ՝୊ͱকདྷੑ
46. • ͍͔ͭ͘ͷϓϥοτϑΥʔϜͰ͸UI·Ͱڞ௨Խ͕೉͍͠ • StableͰͳ͍ͷͰϓϩδΣΫτશମͷେ͖ͳมߋ͕ඞཁͱͳΔ৔߹͕͋Δ • Swiftͱͷޓ׵ੑͰਏ͍͜ͱ͕… • Kotlin/NativeͷϏϧυ͕࣌ؒ௕͍ • ίϛϡχςΟ͕·ͩൺֱతখ͍͔͞΋ʁ KEEP GOING https://github.com/dropbox/AffectedModuleDetector • Kotlin/NativeͷϏϧυ͕࣌ؒ௕͍ KMMͷ՝୊ͱকདྷੑ ABEMAͰ͸ɼdropbox/AffectedModuleDetectorΛ Kotlin MultiplatformͰར༻Ͱ͖ΔΑ͏ʹͯ͠ɼมߋӨڹ ͷ͋ΔϞδϡʔϧͷΈΛϏϧυ͍ͯ͠Δ
47. ࠷ۙͷτϐοΫε
48. Hierarchical Project Structure • ϓϥοτϑΥʔϜͷιʔεηοτΛ·ͱΊΔ͜ͱ͕Մೳʹ • Kotlin 1.4.0͔ΒಋೖՄೳ • Kotlin 1.6.20͔Β৽نϓϩδΣΫτ࡞੒ͷࡍʹσϑΥϧτͰઃఆ͞ΕΔΑ͏ʹ commonMain androidMain iosArm64Main iosX64Main commonMain androidMain iosArm64Main iosX64Main iosMain No Hierarchical Hierarchical https://kotlinlang.org/docs/multiplatform-hierarchy.html
49. Hierarchical project structure • gradle.propertiesͰઃఆ • ґଘ͍ͯ͠ΔϥΠϒϥϦ͕ରԠ͍ͯ͠ͳ͍৔߹͸ɼiosMain ͱ͍ͬͨڞ௨ιʔεηοτͰϥΠϒϥϦΛ࢖༻Ͱ͖ͳ͍ ࢀߟจݙɿhttps://kotlinlang.org/docs/multiplatform.html#how-kotlin-multiplatform-works ରԠ͢Δʹ͸ʁ kotlin.mpp.enableGranularSourceSetsMetadata=true kotlin.native.enableDependencyPropagation=false https://kotlinlang.org/docs/multiplatform-hierarchy.html
50. Hierarchical project structure ࢀߟจݙɿhttps://kotlinlang.org/docs/multiplatform.html#how-kotlin-multiplatform-works Lean More? https://youtu.be/5QPPZV04-50
51. Kotlin/Native Memory Management • ݻ༗ͷϧʔϧ • ϧʔϧ1ɿMutable State == 1 thread • ϧʔϧ2ɿImmutable State == many thread • Immutable State != val • ϥϯλΠϜͰෆมͳঢ়ଶʢfrozen stateʣͰ͋Δ͜ͱ͕ٻΊΒΕΔ • freeze()Ͱ͋ΒΏΔΠϯελϯεΛfreezeͰ͖Δ https://kotlinlang.org/docs/multiplatform-mobile-concurrency-overview.html Kotlin/NativeͷϚϧνεϨουϓϩάϥϛϯάͷ՝୊
52. Kotlin/Native Memory Management • ղܾࡦ • AtomicXxxΛ࢖༻͢Δ • Thread-isolate stateΛ࢖༻͢Δ ImmutableͰͳ͍ͱෳ਺εϨουͰѻ͑ͳ͍ʁ https://kotlinlang.org/docs/multiplatform-mobile-concurrent-mutability.html
53. ͱ͸͍͑ɼKotlin/NativeͷͨΊʹ ରԠ͕ඞཁʹͳΔͷਏ͍… 🥲 AtomicReferenceͷϝϞϦϦʔΫͷ໰୊΋͋Δ… 🥲
54. New Kotlin/Native Memory Management • Reference-counting GC → Tracing GC ※ ࠓޙΞϧΰϦζϜ͕มΘΔՄೳੑ΋͋Δ • ฒߦͰͷGC͕Մೳʹ • freeze()͕ෆཁʹͳΔ • AtomicReference͸Ҿ͖ଓ͖ඞཁ • AtomicReferenceΛؚΜͩ॥؀ࢀরʹΑΔϝϞϦϦʔΫͷ৺഑͸ແ͘ͳͬͨ • Kotlin 1.6.20͔ΒexperimentalͳNew Memory Manager͕࢖༻Մೳ • GCͷύϑΥʔϚϯεʹ·ͩ໰୊͋Γ • Kotlin 1.7.0Ͱalphaʹ New Memory ManagementͰͲ͏ͳΔ͔ https://blog.jetbrains.com/kotlin/2021/05/kotlin-native-memory-management-update/
55. New Kotlin/Native Memory Management • ϚΠάϨʔγϣϯΨΠυ • https://github.com/JetBrains/kotlin/blob/master/kotlin-native/NEW_MM.md • ϥΠϒϥϦ • kotlinx.coroutines • 1.6.0Ҏ߱ɼnative-mtόʔδϣϯΛ࢖༻͠ͳͯ͘ྑ͘ͳΔ • ktor • 2.0.0Ҏ߱͸New memory managementʹରԠ͢Δඞཁ͕͋Δ New Memory ManagementΛࢼ͢
56. Kotlin roadmap update https://kotlinlang.org/docs/roadmap.html • KMM Beta ʹ޲͚ͯ҆ఆੑΛߴΊ͍ͯ͘ಈ͖ • AGPͱͷ࿈ܞ͕ڧԽ͞Εͦ͏ʁ (KT-52599)
57. Kotlin roadmap update https://kotlinlang.org/docs/roadmap.html • Swift΁ͷ௚઀ม׵͸Ұ౓pending͞Εͨ (KT-49521) • Ϟδϡʔϧ͝ͱͷ໊લۭؒΛ࡞੒͢Δಈ͖͕ਐΈͦ͏ (KT-42248)
58. Have a Nice Kotlin!