* Observer remove directory notification.
*/
private void notifyRmdir(final FtpIoSession session, final FileObject file) {
StatisticsObserver observer = this.observer;
if (observer != null) {
observer.notifyRmdir();
}
FileObserver fileObserver = this.fileObserver;
if (fileObserver != null) {
fileObserver.notifyRmdir(session, file);