code: @Override
      public long getCountHighWaterMark() {
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
              SibTr.entry(tc, "getCountHighWaterMark");
  
          long destHigh = _destHighMsgs + getSubscriberCount();
  
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
              SibTr.exit(tc, "getCountHighWaterMark", Long.valueOf(destHigh));
          return destHigh;
      }
docs: /*
  (non-Javadoc)
  
  @see com.ibm.ws.sib.msgstore.ItemStream#getCountHighWaterMark()