code: @Override
    public void shutdown(ShutdownModeAmp mode)
    {
      // jamp/3210
      //getReadMailbox().close();
      try {
        getServiceRefOut().shutdown(mode);
      } catch (Throwable e) {
        log.log(Level.FINER, e.toString(), e);
      }
      
      for (ServiceRefAmp service : _linkServiceMap.values()) {
        service.shutdown(mode);
      }
      
      for (StubAmp actor : _closeList) {
        actor.onShutdown(mode);
      }
    }
docs: Called when the link is closing.