docs: protected void addRecoverableUnit(RecoverableUnit recoverableUnit, boolean recovered)
      {
          if (tc.isEntryEnabled())
              Tr.entry(tc, "addRecoverableUnit", new Object[] { recoverableUnit, recovered, this });
  
          final long identity = recoverableUnit.identity();
  
          _recoverableUnits.put(identity, recoverableUnit);
  
          if (recovered)
          {
              _recUnitIdTable.reserveId(identity, recoverableUnit);
          }
  
          if (tc.isEntryEnabled())
              Tr.exit(tc, "addRecoverableUnit");
      }