close method
Flush all caches and close file handles. Implicitly commits any pending dirty pages.
Implementation
Future<void> close() async {
if (_closed) return;
if (_dirty.isNotEmpty) await commit();
_closed = true;
final d = _data;
_data = null;
if (d != null) {
try {
await d.close();
} catch (_) {/* best-effort */}
}
await _closeAndDeleteJournal();
}