close method

Implementation

@override
Future<void> close() async {
  if (_isClosed) return;
  _isClosed = true;
  try {
    await _worker.close();
  } finally {
    onClose();
    // Deliberately AFTER the teardown, not before it. A listener is app code
    // (`addCloseListener` is public) and `CloseNotifier` calls each one bare,
    // so firing them first would let one throw exit here before
    // `_worker.close()` was ever sent — a leaked isolate that `_isClosed`
    // then makes unrecoverable. It happened once, in this branch.
    //
    // The window that ordering left — the cache still matching this model on
    // params while the teardown ran — is closed by [isClosed] instead, which
    // is already true above and which `EmbedderCache` checks on every read.
    // That covers every implementation in one place, not just this one.
    fireCloseListeners();
  }
}