Vert.x Kotlin Coroutines Example

A movie rating REST application written in Kotlin to demonstrate how it can Kotlin coroutines can be used with Vert.x.

Coroutines enables to write asynchronous code with sequential statements.

Running from the IDE

Run the main function from the IDE

> mvn package
> java -jar target/kotlin-coroutines-examples.jar

Copy hsqldb jar to $VERTX_HOME/lib

> cp $HOME/.m2/repository/org/hsqldb/hsqldb/2.4.0/hsqldb-2.4.0.jar $VERTX_HOME/lib/
> vertx run src/main/kotlin/movierating/App.kt

The application exposes a REST API for getRating movies:

You can know more about a movie

> curl http://localhost:8080/movie/starwars
{"id":"starwars","title":"Star Wars"}

You can get the current rating of a movie:

> curl http://localhost:8080/getRating/indianajones
{"id":"indianajones","rating":5}

Finally you can rate a movie

> curl -X POST http://localhost:8080/rateMovie/starwars?rating=4