docs: public Enumeration listMessagingEngines(String busName) {
  
          String thisMethodName = CLASS_NAME + ".listMessagingEngines(String)";
  
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled()) {
              SibTr.entry(tc, thisMethodName, busName);
          }
  
          Vector v = new Vector();
  
          Enumeration e = listMessagingEngines();
          while (e.hasMoreElements()) {
              Object c = e.nextElement();
              if (((BaseMessagingEngineImpl) c).getBusName().equals(busName))
                  v.addElement(c);
          }
  
          Enumeration elements = v.elements();
  
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled()) {
              SibTr.exit(tc, thisMethodName);
          }
  
          return elements;
      }