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

ᅳࢣ ੣໵
2018೥౓ ৽ଔೖࣾ
גࣜձࣾAbemaTV ։ൃຊ෦ NativeνʔϜ
@ronnnnn_jp
@ronnnnn

View Slide

1. Kotlin Multiplatform MobileʢKMMʣͱ͸
2. Kotlin Multiplatformͷ͜Ε·Ͱ
3. Kotlin Multiplatformͷ࢓૊Έ
4. νʔϜͰಋೖɾӡ༻͍ͯ͘͠ʹ͸
5. KMMͷ՝୊ͱকདྷੑ
6. ࠷ۙͷτϐοΫε

View Slide

Kotlin Multiplatform Mobile
ʢKMMʣͱ͸

View Slide

Kotlin Multiplatform?
• Kotlin by JetBrains
• ୯ҰͷιʔείʔυͰෳ਺ϓϥοτϑΥʔϜͷΞϓϦέʔ
γϣϯ΍ϥΠϒϥϦΛ։ൃͰ͖Δٕज़
https://kotlinlang.org

View Slide

Kotlin Multiplatform?🤔
Kotlin Multiplatform Project (KMP)?🤔
Kotlin Multiplatform Mobile (KMM)?🤔

View Slide

Kotlin Multiplatform / KMP / KMM
• KotlinʹΑͬͯෳ਺ϓϥοτϑΥʔϜͷ։ൃΛߦ͏ٕज़΍
ΤίγεςϜશମ
Kotlin Multiplatform
Kotlin Multiplatform Project (KMP)
• Kotlin MultiplatformΛ༻͍ͯ։ൃ͞ΕΔϓϩδΣΫτ

View Slide

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

View Slide

• KotlinͷڧྗͳAPIΛ׆༻ͯ͠ιʔείʔυΛڞ௨ԽͰ͖Δ
• ֤ϓϥοτϑΥʔϜಛ༗ͷAPI΋΄ͱΜͲར༻Ͱ͖Δ
• Ұ෦ϓϥοτϑΥʔϜΛআ͍ͯɼUI·Ͱڞ௨ԽͰ͖Δ
• ର৅ϓϥοτϑΥʔϜ΋ଟ͍
• HTTPɼγϦΞϥΠζɼඇಉظॲཧͳͲ։ൃʹ͔ܽͤͳ͍ϥΠϒϥϦΛJetBrains͕ఏڙɾ
ϝϯςφϯε͍ͯ͠Δ
• খ͘͞ಋೖΛਐΊΒΕΔ
• ϥΠϒϥϦͱͯ͠഑෍͢Δ͜ͱ΋Ͱ͖Δ
Kotlin Multiplatform΍KMMͷϝϦοτ

View Slide

Flutter΍UnityͳͲͱͷҧ͍͸ʁ
• ֤ϓϥοτϑΥʔϜͰΞϓϦέʔγϣϯ͕ϥϯλΠϜͰಈ
࡞͢Δ࣮ߦ؀ڥΛඞཁͱ͢Δ
• UI·Ͱڞ௨Խ͢Δ͜ͱ͕Մೳ
Flutter, Unity…
Kotlin Multiplatform
• ಛఆͷ࣮ߦ؀ڥΛඞཁͱ͠ͳ͍
• KotlinΛ֤ϓϥοτϑΥʔϜͰಈ࡞͢ΔNativeίʔυʹม
׵͢Δ
• ݱ࣌఺Ͱ͸iOSͷUIڞ௨ԽΛެ͕ࣜαϙʔτ͍ͯ͠ͳ͍

View Slide

Kotlin Multiplatformͷ͜Ε·Ͱ

View Slide

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)
Alpha
Hierarchical project structure
Kotlin NativeͷύϑΥʔϚϯεվળ
Experimental new memory
manager
Alpha new memory
manager

View Slide

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
Alpha
manager
Alpha new memory
manager
https://blog.jetbrains.com/kotlin/2017/11/kotlin-1-2-released/

View Slide

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
Alpha
manager
Alpha new memory
manager
https://youtu.be/3uVUDsoE_5U?t=220 
https://blog.jetbrains.com/kotlin/2020/08/kotlin-multiplatform-mobile-goes-alpha/

View Slide

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
Alpha
manager
Alpha new memory
manager
https://blog.jetbrains.com/kotlin/2021/08/try-the-new-kotlin-native-memory-manager-development-preview/

View Slide

https://youtu.be/3uVUDsoE_5U?t=303

View Slide

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.

View Slide

https://youtu.be/LE-Dy9XCLxk?t=586

View Slide

https://kotlinlang.org/docs/components-stability.html#current-stability-of-kotlin-components

View Slide

Kotlin Multiplatformͷ࢓૊Έ

View Slide

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

View Slide

Code sharing
• commonιʔεηοτʹڞ௨ϓϥοτϑΥʔϜͷ࣮૷Λஔ
͘͜ͱ͕Ͱ͖Δ
• ϓϥοτϑΥʔϜಛ༗ͷιʔεηοτ΋࣋ͯΔ
• Hierarchical project structureʹΑͬͯɼ͍ۙ؀ڥͷϓ
ϥοτϑΥʔϜΛڞ௨Խͨ͠ιʔεηοτ΋࡞ΕΔ
https://kotlinlang.org/docs/multiplatform.html#how-kotlin-multiplatform-works

View Slide

Project Structure
Android޲͚ͷιʔεηοτ
ϓϥοτϑΥʔϜڞ௨ιʔεηοτ
iOS޲͚ͷιʔεηοτ

View Slide

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

View Slide

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

View Slide

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)

}

}

}

View Slide

Build configuration
kotlin {

android()

listOf(

iosX64(),

iosArm64(),

iosSimulatorArm64()

).forEach {


baseName = "base"

}

}

sourceSets {


dependencies {

// …

}

}












}









}

}

}
λʔήοτϓϥοτϑΥʔϜͷࢦఆ

View Slide

Build configuration
kotlin {

android()

listOf(

iosX64(),

iosArm64(),

iosSimulatorArm64()

).forEach {


baseName = "base"

}

}

sourceSets {


dependencies {

// implementation(…)

}

}












}









}

}

}
ґଘؔ܎ͳͲͷઃఆ
※ ґଘ͢ΔϥΠϒϥϦଆͰɼ
λʔήοτͱͳΔϓϥοτϑΥʔ
ϜʹରԠ͍ͯ͠ͳ͍ͱ͍͚ͳ͍

View Slide

Build configuration
kotlin {

android()

listOf(

iosX64(),

iosArm64(),

iosSimulatorArm64()

).forEach {


baseName = "base"

}

}

sourceSets {


dependencies {


}

}












}









}

}

}
ϥΠϒϥϦͷґଘؔ܎
※ commonͰґଘ͍ͯ͠ΔϥΠϒ
ϥϦ͕֤ϓϥοτϑΥʔϜʹର
Ԡ͍ͯ͠Ε͹ɼϓϥοτϑΥʔ
ϜผʹґଘΛॻ͘ඞཁ͸ͳ͍

View Slide

Build configuration
kotlin {

android()

listOf(

iosX64(),

iosArm64(),

iosSimulatorArm64()

).forEach {


baseName = "base"

}

}

sourceSets {


dependencies {


}

}












}









}

}

}
ιʔεηοτಉ࢜ͷґଘؔ܎

View Slide

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

View Slide

νʔϜͰಋೖɾӡ༻͍ͯ͘͠ʹ͸

View Slide

Kotlin΍Kotlin MultiplatformΛ஌Δ
• ެࣜυΩϡϝϯτ
• ެࣜϒϩά
• YouTubeνϟϯωϧ
• Slack
• Twitter
• reddit
• ϋϯζΦϯ
• αϯϓϧϓϩδΣΫτ
• …

View Slide

• ެࣜϒϩά
• Slack
• Twitter
• reddit
• ϋϯζΦϯ
• …
• ެࣜϒϩά
• Slack
• Twitter
• reddit

View Slide

• ެࣜϒϩά
• Slack
• Twitter
• reddit
• ϋϯζΦϯ
• …
• ϋϯζΦϯ

View Slide

Ͳ͏ಋೖ͍͔ͯ͘͠Λߟ͑Δ
https://youtrack.jetbrains.com/issue/KT-49521
• ϞϊϨϙʁϥΠϒϥϦʁ
• Ͳ͜Λڞ௨Խ͢Δʁ
• ΞʔΩςΫνϟ
• ϓϩδΣΫτͷߏ੒
• ϥΠϒϥϦબఆ
• ςετͷํ਑

View Slide

Ͳ͏ಋೖ͍͔ͯ͘͠Λߟ͑Δ
https://www.youtube.com/channel/UCYvmsuoQ32tVY6MpOYhr5jA/videos
• ϞϊϨϙʁϥΠϒϥϦʁ
• Ͳ͜Λڞ௨Խ͢Δʁ
• ΞʔΩςΫνϟ
• ϓϩδΣΫτͷߏ੒
• ϥΠϒϥϦબఆ
• ςετͷํ਑
ABEMAͷࣄྫ

View Slide

νʔϜΛઆಘ͢Δ
• έʔεελσΟ
https://kotlinlang.org/lp/mobile/case-studies/

View Slide

ϝϯόʔͷࢀೖϋʔυϧΛԼ͛Δ
• υΩϡϝϯςʔγϣϯ
• ษڧձ

View Slide

View Slide

KMMͷ՝୊ͱকདྷੑ

View Slide

• ͍͔ͭ͘ͷϓϥοτϑΥʔϜͰ͸UI·Ͱڞ௨Խ͕೉͍͠
• StableͰͳ͍ͷͰϓϩδΣΫτશମͷେ͖ͳมߋ͕ඞཁͱͳΔ৔߹͕͋Δ
• Swiftͱͷޓ׵ੑͰਏ͍͜ͱ͕…
• Kotlin/NativeͷϏϧυ͕࣌ؒ௕͍
• ίϛϡχςΟ͕·ͩൺֱతখ͍͔͞΋ʁ

View Slide

• ͍͔ͭ͘ͷϓϥοτϑΥʔϜͰ͸UI·Ͱڞ௨Խ͕೉͍͠ FUTURE?

View Slide

FUTURE?

View Slide

KEEP GOING

View Slide

KEEP GOING
https://github.com/dropbox/AffectedModuleDetector
ABEMAͰ͸ɼdropbox/AffectedModuleDetectorΛ
Kotlin MultiplatformͰར༻Ͱ͖ΔΑ͏ʹͯ͠ɼมߋӨڹ
ͷ͋ΔϞδϡʔϧͷΈΛϏϧυ͍ͯ͠Δ

View Slide

࠷ۙͷτϐοΫε

View Slide

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

View Slide

• 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

View Slide

ࢀߟจݙɿhttps://kotlinlang.org/docs/multiplatform.html#how-kotlin-multiplatform-works
Lean More?
https://youtu.be/5QPPZV04-50

View Slide

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՝୊

View Slide

Kotlin/Native Memory Management
• ղܾࡦ
• AtomicXxxΛ࢖༻͢Δ
• Thread-isolate stateΛ࢖༻͢Δ
ImmutableͰͳ͍ͱෳ਺εϨουͰѻ͑ͳ͍ʁ
https://kotlinlang.org/docs/multiplatform-mobile-concurrent-mutability.html

View Slide

ͱ͸͍͑ɼKotlin/NativeͷͨΊʹ
ରԠ͕ඞཁʹͳΔͷਏ͍… 🥲
AtomicReferenceͷϝϞϦϦʔΫͷ໰୊΋͋Δ… 🥲

View Slide

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/

View Slide

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

View Slide

Kotlin roadmap update
https://kotlinlang.org/docs/roadmap.html
• KMM Beta ʹ޲͚ͯ҆ఆੑΛߴΊ͍ͯ͘ಈ͖
• AGPͱͷ࿈ܞ͕ڧԽ͞Εͦ͏ʁ (KT-52599)

View Slide

Kotlin roadmap update
https://kotlinlang.org/docs/roadmap.html
• Swift΁ͷ௚઀ม׵͸Ұ౓pending͞Εͨ (KT-49521)
• Ϟδϡʔϧ͝ͱͷ໊લۭؒΛ࡞੒͢Δಈ͖͕ਐΈͦ͏ (KT-42248)

View Slide

Have a Nice Kotlin!

View Slide

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

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

Seiya Kokushi

More Decks by Seiya Kokushi

Other Decks in Technology

Featured

Transcript