Kotlin idioms in Jooby
Overview
Jooby wasn’t original designed as a Kotlin framework, but thanks to the power and expressiveness of Kotlin we were able to write a nice and tiny module that let you write idiomatic Kotlin in Jooby.
Bootstrap idiom
The bootstrap idiom comes in two flavors:
run function:
Kooby class:
The run idiom is nice to quickly bootstrap an application, but doesn’t work well if you want to write unit and/or integration tests.
Request idiom
The request idiom give us implicit access to request functions and properties. So, instead of:
Just need:
Works for body and form-submits too:
param, header and body idioms
Previous examples used the Java API for accessing request objects. The request idiom comes with a couple of reified functions:
Nice ugh?
Route idiom
The route idiom group two or more routes under a common path, like:
Class idiom
The class idiom is a small enhancement that allow you to provide a Kotlin class reference while adding MVC routes, requiring dependencies, etc…
Just write: Pet::class where a class reference is required, instead of Pet::class.java
Conclusion
As said before Jooby wasn’t a Kotlin framework but luckily enough the kotlin module close the gap and help you write idiomatic Kotlin.
Here is another example of a minimal HTTP API using the Jackson and Jdbi modules:
In addition to the kotlin module, Jooby comes with two starter projects:
- kotlin-starter: Maven project with everything setup and ready to run.
- kotlin-gradle-starter: Gradle project with everything setup, ready to run and spek for unit and integration tests
That’s all for now. Happy Kotlin coding!
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