This repository contains the source code for the live demo "Idiomatic Kotlin Microservices" given at the FOSDEM 2020 conference.
You will find the code which was produced during the talk in the execution/ directory, and a slightly more sophisticated solution of the same in the mastersolution/ directory.
- Ktor ... Web Framework (Spring Boot)
- Kodein ... Dependency Injection (Spring Framework)
- kotlin-serialization ... JSON serializer (Jackson/Gson)
- Exposed ... Persistence Manager (JPA, Hibernate)
Spek(*) TestNG ... Test Framework (JUnit/TestNG)- kotlin-logging ... Logging Facade (Slf4j)
- Detekt ... Static Code Analysis (Checkstyle)
- Gradle Kotlin-DSL
./gradlew run... start local server on port 8080./gradlew test... run ~~ Spek~~ TestNG tests./gradlew detekt... run static code analysis./gradlew dependencyUpdates... check if all dependencies are up2date
What else could have been done to make this demo a full fledged application:
- Full CRUD operations
- Exception Handling
- Application Konfiguration (no more properties files)
- More sophisticated Kodein usage (
kodein.allInstances<Type>()) - Custom JSON serializer (also for Jackson/Gson)
- More sophisticated test setup (Mockk)
- OpenAPI/Swagger + (custom) Kotlin Code Generation
- KScript ;) instead of shell scripts
Plus
- Making full use of language features rokks ;)
- Lots of libraries have been rewritten / thin on-top API layer written
- Highly concise and expressive; feels natural and straight forward to write/read
Minus
- Sometimes feeling pain of paradigm shift when using Java libraries
- Sometimes missing out some Java tools (proper coverage metrics, sonarqube like experience)
- Sometimes missing well established coding guidelines / best practices
- (*) Spek just doesn't really felt right for me, although "pure" Kotlinish, I still decided to go for good old TestNG (better fit than JUnit)