ModelNotifyingPresenter.kt

class MainModel {
    fun doBackgroundWork() {
        object : AsyncTask<Unit, Unit, Unit>() {
            override fun doInBackground(vararg params: Unit?) {
                // Heavy work
            }

            override fun onPostExecute(result: Unit?) {
                bus.post(ServerCallCompletedEvent())
            }
        }.execute()
    }
  
    class ServerCallCompletedEvent
}