Corda + Ktor - gracefully disconnecting from node

Server.kt

fun NettyApplicationEngine.addShutdownHook() {
  Runtime.getRuntime().addShutdownHook(Thread {
    stop(1, 1, TimeUnit.SECONDS)
  })
  Thread.currentThread().join()
}

fun Application.addShutdownEvent(connection: CordaRPCConnection) {
  environment.monitor.subscribe(ApplicationStopped) {
    connection.notifyServerAndClose()
  }
}