docs: void invalidate() {
  
          try {
  
              // Attempt to close delegate connection
              _delegateConnection.close();
  
          } catch (SIException exception) {
  
              FFDCFilter.processException(exception,
                                          "com.ibm.ws.sib.ra.impl.SibRaConnection.invalidate",
                                          "1:1875:1.41", this);
  
              if (TraceComponent.isAnyTracingEnabled() && TRACE.isEventEnabled()) {
                  SibTr.exception(this, TRACE, exception);
              }
          } catch (SIErrorException exception) {
  
              FFDCFilter.processException(exception,
                                          "com.ibm.ws.sib.ra.impl.SibRaConnection.invalidate",
                                          "1:1884:1.41", this);
  
              if (TraceComponent.isAnyTracingEnabled() && TRACE.isEventEnabled()) {
                  SibTr.exception(this, TRACE, exception);
              }
          }
  
          _valid = false;
  
      }