code: void close() {
  
          final String methodName = "close";
          if (TraceComponent.isAnyTracingEnabled() && TRACE.isEntryEnabled()) {
              SibTr.entry(this, TRACE, methodName);
          }
  
          /*
           * Cancel any ongoing dispatch
           */
          _cancelled = true;
  
          if (TraceComponent.isAnyTracingEnabled() && TRACE.isEntryEnabled()) {
              SibTr.exit(this, TRACE, methodName);
          }
  
      }
docs: Closes the session associated with this dispatcher and releases the
  message endpoint.