Creating Custom Feature

is a feature instance class, which should be immutable to avoid unintended side-effects in a highly concurrent environment.Feature implementation should be thread-safe as it will be called from multiple threads.

The Feature companion object conforms the ApplicationFeature interface and acts as a glue to construct the actual with the right Configuration.

fun Application.main() {
        prop = "Hello" // configuration script
}

See a complete example in the custom feature sample.