我正在尝试使用rotatingserveradvice从多个资源轮询新文件。我有一个新的要求，即对于每个新的客户机，在sftp服务器中创建一个新的目录，并且我还想将该目录添加到轮询中。所以我将使用int-sftp:outbound-gateway to 查询所有目录并检查是否创建了新目录，然后将新目录添加到关键目录中。有可能是那样吗？谢谢您。

@Bean
public RotatingServerAdvice advice() {
  List<RotationPolicy.KeyDirectory> keyDirectories = new ArrayList<>();
  keyDirectories.add(new RotationPolicy.KeyDirectory("one", "foo"));
  keyDirectories.add(new RotationPolicy.KeyDirectory("one", "bar"));
  keyDirectories.add(new RotationPolicy.KeyDirectory("two", "baz"));
  keyDirectories.add(new RotationPolicy.KeyDirectory("two", "qux"));
  keyDirectories.add(new RotationPolicy.KeyDirectory("three", "fiz"));
  keyDirectories.add(new RotationPolicy.KeyDirectory("three", "buz"));
  return new RotatingServerAdvice(delegatingSf(), keyDirectories);
}