interface Callback
{
  oneway void shutdown (in boolean is_clean);
  // A safe way to shutdown the client, using either clean shutdowns
  // or "catastrophic failures".
};

interface Simple_Server
{
  long test_method (in boolean do_callback,
                    in boolean is_clean,
                    in Callback cb);
  // Just call a method on the server, we can pass a callback object
  // so the server can be tested for client shutdowns.

  void shutdown_now (in boolean is_clean);
  // An unsafe way to shutdown the server, we can even ask for a
  // "catastrophic crash" (implemented using abort())

  oneway void shutdown ();
  // A safe way to shutdown the server, it is a oneway function so we
  // will never get a COMM_FAILURE error
};