docs: public boolean setWriter(TransactionImpl tx, Object obj)
      {
          checkTimedOutLocks();
  
          Identity oid = new Identity(obj, tx.getBroker());
          LockEntry writer = new LockEntry(oid.toString(),
                  tx.getGUID(),
                  System.currentTimeMillis(),
                  LockStrategyFactory.getIsolationLevel(obj),
                  LockEntry.LOCK_WRITE);
          String oidString = oid.toString();
          setWriterInternal(writer, oidString);
          return true;
      }