EventBus.kt

// reified is not visible from Java
class EventBus {

   inline fun <reified T : Event> subscribe(
           noinline callback: (T) -> Unit) {
       // ...
   }

}

// @JvmSynthetic was designed for this purpose
interface EventBus {

   @JvmSynthetic
   fun <T: Event> subscribe(eventType: KClass<T>)

}

// extension functions are not visible on the same class
inline fun <reified T : Event> EventBus.subscribe(
      noinline callback: (T) -> Unit) {
   return subscribe(
           klass = T::class,
           callback = callback)
}