docs: @Override
      public String getReadAhead() {
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
              SibTr.entry(this, tc, "getReadAhead");
          String ra = jcaConnectionFactory.getReadAhead();
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
              SibTr.exit(this, tc, "getReadAhead", ra);
          return ra;
      }