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Building Multiplatform Projects with Kotlin Sergey Ryabov

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WRITE ONCE, RUN EVERYWHERE! © JAVA

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Client Backend Models Business Logic Presenters Views Android

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Client Backend Models Business Logic Presenters Views Android Client Backend Models Business Logic Presenters Views iOS Client Backend Models Business Logic Presenters Views Web Models Business Logic Backend

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Client Backend Models Business Logic Presenters Views Android Client Backend Business Logic Presenters Views iOS Client Backend Business Logic Presenters Views Web Business Logic Backend

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Client Backend Models Business Logic Presenters Views Android Client Backend Presenters Views iOS Client Backend Presenters Views Web Business Logic Backend

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Client Backend Models Business Logic Presenters Views Android Client Backend Views iOS Client Backend Views Web Business Logic Backend

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WHAT DO WE ALREADY HAVE FOR THAT?

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• C++ WHAT DO WE ALREADY HAVE FOR THAT?

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• C++ • J2ObjC + GWT WHAT DO WE ALREADY HAVE FOR THAT?

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• C++ • J2ObjC + GWT • Xamarin WHAT DO WE ALREADY HAVE FOR THAT?

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• C++ • J2ObjC + GWT • Xamarin • ReactNative / Flutter WHAT DO WE ALREADY HAVE FOR THAT?

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MAJOR PROBLEMS

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• Access to native APIs MAJOR PROBLEMS

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• Access to native APIs • Latest SDK version support MAJOR PROBLEMS

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• Access to native APIs • Latest SDK version support • Modern dev stack MAJOR PROBLEMS

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• Access to native APIs • Latest SDK version support • Modern dev stack • Executable size MAJOR PROBLEMS

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WHY KOTLIN?

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Feb 2016 - Kotlin 1.0: production JVM, experimental JS WHY KOTLIN?

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Feb 2016 - Kotlin 1.0: production JVM, experimental JS Mar 2017 - Kotlin 1.1: production JS WHY KOTLIN?

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Feb 2016 - Kotlin 1.0: production JVM, experimental JS Mar 2017 - Kotlin 1.1: production JS Apr 2017 - Kotlin Native Tech Preview WHY KOTLIN?

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Feb 2016 - Kotlin 1.0: production JVM, experimental JS Mar 2017 - Kotlin 1.1: production JS Apr 2017 - Kotlin Native Tech Preview Nov 2017 - Kotlin Native 0.4: iOS support WHY KOTLIN?

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Feb 2016 - Kotlin 1.0: production JVM, experimental JS Mar 2017 - Kotlin 1.1: production JS Apr 2017 - Kotlin Native Tech Preview Nov 2017 - Kotlin Native 0.4: iOS support Nov 2017 - Kotlin 1.2: Multiplatform projects, JVM/JS support WHY KOTLIN?

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Feb 2016 - Kotlin 1.0: production JVM, experimental JS Mar 2017 - Kotlin 1.1: production JS Apr 2017 - Kotlin Native Tech Preview Nov 2017 - Kotlin Native 0.4: iOS support Nov 2017 - Kotlin 1.2: Multiplatform projects, JVM/JS support Feb 2018 - Kotlin Native 0.6: Multiplatform support WHY KOTLIN?

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Feb 2016 - Kotlin 1.0: production JVM, experimental JS Mar 2017 - Kotlin 1.1: production JS Apr 2017 - Kotlin Native Tech Preview Nov 2017 - Kotlin Native 0.4: iOS support Nov 2017 - Kotlin 1.2: Multiplatform projects, JVM/JS support Feb 2018 - Kotlin Native 0.6: Multiplatform support + transparent ObjC/Kotlin collection types interop WHY KOTLIN?

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Feb 2016 - Kotlin 1.0: production JVM, experimental JS Mar 2017 - Kotlin 1.1: production JS Apr 2017 - Kotlin Native Tech Preview Nov 2017 - Kotlin Native 0.4: iOS support Nov 2017 - Kotlin 1.2: Multiplatform projects, JVM/JS support Feb 2018 - Kotlin Native 0.6: Multiplatform support + transparent ObjC/Kotlin collection types interop Jul 2018 - Kotlin Native 0.8: kotlin-stdlib sync with JVM/JS WHY KOTLIN?

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WHY KOTLIN IS BETTER?

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WHY KOTLIN IS BETTER? • Access to native APIs

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WHY KOTLIN IS BETTER? • Access to native APIs • Latest SDK version support

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WHY KOTLIN IS BETTER? • Access to native APIs • Latest SDK version support • Modern dev stack

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WHY KOTLIN IS BETTER? • Access to native APIs • Latest SDK version support • Modern dev stack • Executable size

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HOW DOES IT WORK IN KOTLIN?

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• Gradle multimodule projects HOW DOES IT WORK IN KOTLIN?

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• Gradle multimodule projects • Common HOW DOES IT WORK IN KOTLIN?

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• Gradle multimodule projects • Common • Platform HOW DOES IT WORK IN KOTLIN?

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• Gradle multimodule projects • Common • Platform • Regular
 HOW DOES IT WORK IN KOTLIN?

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• Gradle multimodule projects • Common • Platform • Regular
 • Multiplatform headers & implementations HOW DOES IT WORK IN KOTLIN?

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• Gradle multimodule projects • Common • Platform • Regular
 • Multiplatform headers & implementations • expect & actual HOW DOES IT WORK IN KOTLIN?

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Models Presenters Business Logic Views Repository

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Models Presenters Business Logic Views Repository

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Models common Presenters Business Logic common-client Views Repository

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Models common common-client Presenters Business Logic View Interfaces Repo Interfaces Repository Views

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Models common common-client Presenters Business Logic View Interfaces Repo Interfaces JS Models common-js JVM Models common-jvm Repository Repository Views Views Views

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Models common common-client Presenters Business Logic View Interfaces Repo Interfaces Repository Views client-js JS Models common-js JVM Models common-jvm Repository Views client-android Views

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Models common common-client Presenters Business Logic View Interfaces Repo Interfaces Repository Views client-js Repository client-jvm JS Models common-js JVM Models common-jvm Views client-android Views client-desktop

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Models common common-client Presenters Business Logic View Interfaces Repo Interfaces Repository Views client-js Repository client-jvm JS Models common-js JVM Models common-jvm backend Views client-android Views client-desktop

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EXAMPLE: ANDROID APP + FIREFOX EXTENSION

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EXAMPLE: ANDROID APP + FIREFOX EXTENSION http://jennift.com/dpical.html Original

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EXAMPLE: ANDROID APP + FIREFOX EXTENSION http://jennift.com/dpical.html Original

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Business Logic View Interfaces common android Views Views js EXAMPLE: ANDROID APP + FIREFOX EXTENSION Presenters

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CAVEATS

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• Drawbacks of the concept CAVEATS

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• Drawbacks of the concept • Lots of manual work for module configuration (KT-23930) CAVEATS

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• Drawbacks of the concept • Lots of manual work for module configuration (KT-23930) • Several platform codebases can’t sit in one module (different SourceSets )
 CAVEATS

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• Drawbacks of the concept • Lots of manual work for module configuration (KT-23930) • Several platform codebases can’t sit in one module (different SourceSets )
 • Every platform has its own problems CAVEATS

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• Drawbacks of the concept • Lots of manual work for module configuration (KT-23930) • Several platform codebases can’t sit in one module (different SourceSets )
 • Every platform has its own problems • Kotlin/JS CAVEATS

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• Drawbacks of the concept • Lots of manual work for module configuration (KT-23930) • Several platform codebases can’t sit in one module (different SourceSets )
 • Every platform has its own problems • Kotlin/JS • One output JS-file per module CAVEATS

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• Drawbacks of the concept • Lots of manual work for module configuration (KT-23930) • Several platform codebases can’t sit in one module (different SourceSets )
 • Every platform has its own problems • Kotlin/JS • One output JS-file per module • Manual setup for including libs in the output CAVEATS

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• Drawbacks of the concept • Lots of manual work for module configuration (KT-23930) • Several platform codebases can’t sit in one module (different SourceSets )
 • Every platform has its own problems • Kotlin/JS • One output JS-file per module • Manual setup for including libs in the output • Kotlin/Native CAVEATS

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• Drawbacks of the concept • Lots of manual work for module configuration (KT-23930) • Several platform codebases can’t sit in one module (different SourceSets )
 • Every platform has its own problems • Kotlin/JS • One output JS-file per module • Manual setup for including libs in the output • Kotlin/Native • Still experimental - some features are not supported CAVEATS

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• Drawbacks of the concept • Lots of manual work for module configuration (KT-23930) • Several platform codebases can’t sit in one module (different SourceSets )
 • Every platform has its own problems • Kotlin/JS • One output JS-file per module • Manual setup for including libs in the output • Kotlin/Native • Still experimental - some features are not supported • No reuse for multiplatform (yet) CAVEATS

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FUTURE PLANS

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• Re-thinking Multimodule projects configuration FUTURE PLANS

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• Re-thinking Multimodule projects configuration • Catching up Kotlin/Native with other platforms FUTURE PLANS

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• Re-thinking Multimodule projects configuration • Catching up Kotlin/Native with other platforms • Increasing common libs count • kotlin.test • kotlinx.html • kotlinx.serialization • kotlinx.coroutines • kotlinx.io • SQLDelight • … FUTURE PLANS

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PRODUCTION USAGE

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• KotlinConf app (https://github.com/jetbrains/kotlinconf-app) PRODUCTION USAGE

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• KotlinConf app (https://github.com/jetbrains/kotlinconf-app) • Droidcon NYC (Sessionize) app (https://github.com/touchlab/DroidconKotlin) PRODUCTION USAGE

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• KotlinConf app (https://github.com/jetbrains/kotlinconf-app) • Droidcon NYC (Sessionize) app (https://github.com/touchlab/DroidconKotlin) • Revolut (in-progress) PRODUCTION USAGE

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WRITE ONCE,.RUN EVERYWHERE

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WRITE ONCE,.SHARE EVERYWHERE

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• Create common business logic, not UI WRITE ONCE,.SHARE EVERYWHERE

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• Create common business logic, not UI • Write every part of the app in one language (optional) WRITE ONCE,.SHARE EVERYWHERE

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• Code from the talk https://goo.gl/VYgHmr • Serialization support for Kotlin/Native https://github.com/Kotlin/kotlinx.serialization/issues/86 • Channels support for Kotlin/Native https://github.com/Kotlin/kotlinx.coroutines/issues/462 • New Multiplatform configuration approach https://youtrack.jetbrains.com/issue/KT-23930 LINKS

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Building Multiplatform Projects with Kotlin Sergey Ryabov @colriot