getLeafId method

@override Future<String?> getLeafId()

Returns the id of the active leaf record, or null at the tree root.

Implementation

@override
Future<String?> getLeafId() async {
  // The tracked leaf is healed at load (issue #858) and every append
  // sets a just-written id, so a persisted dangle is unreachable; the
  // alarm below can only fire on a caller-mutated id (issue #1114).
  final leafId = _currentLeafId;
  if (leafId != null && !_byId.containsKey(leafId)) {
    throw SessionException(
      'Entry $leafId not found',
      code: SessionErrorCode.invalidSession,
    );
  }
  return leafId;
}