get method
Implementation
Future<Uint8List> get(int pageId) async {
if (_map.containsKey(pageId)) {
_touch(pageId);
return Uint8List.fromList(_map[pageId]!.data);
}
// Cache miss: read from disk, admit as clean
final data = await pager.readPage(pageId);
await _admit(pageId, data, dirty: false);
return Uint8List.fromList(data);
}