/** @see LockManager#stealLock */
  @Override
  public LockAttemptResult stealLock(Long lsn, Locker locker, LockType lockType)
      throws DatabaseException {

    if (locker.lockingRequired()) {
      return superiorLockManager.stealLock(lsn, locker, lockType);
    }
    return null;
  }