docs: public void close(int requestNumber)
     {
        if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled()) SibTr.entry(this, tc, "close", requestNumber);
  
        if (subConsumer != null)
        {
           subConsumer.close(requestNumber);
        }
        else
        {
           super.close(requestNumber);
        }
  
        if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled()) SibTr.exit(this, tc, "close");
     }