scope jdk_watchService_start.

static new Flag #started;
static new MultiMap<WatchKey, O> #listeners;

static WatchService jdk_watchService_start() {
  final WatchService service = jdk_defaultWatchService();
  if (jdk_defaultWatchService_start_started.raise()) thread "Watch Service" {
    while licensed { 
      WatchKey key = service.poll(10, TimeUnit.SECONDS);
      if (key != null) {
        for (WatchEvent<?> event : wk.pollEvents()) pcall {
          final Path changed = (Path) event.context();
          print("WatchService Changed: " + changed + ", " + event.kind());
          pcallFAll(listeners.get(key), changed.toFile());
        }
        key.reset();
      }
    }
  }
  ret service;
}

end scope