docs: public boolean addReader(TransactionImpl tx, Object obj)
      {
          checkTimedOutLocks();
  
          Identity oid = new Identity(obj,getBroker());
          LockEntry reader = new LockEntry(oid.toString(),
                  tx.getGUID(),
                  System.currentTimeMillis(),
                  LockStrategyFactory.getIsolationLevel(obj),
                  LockEntry.LOCK_READ);
  
          addReaderInternal(reader);
          return true;
      }