getCachedMetaData method
Implementation
Future<Map<String, dynamic>> getCachedMetaData(String classId) async {
final cacheDir = await _ensureCacheDir();
final safeId = _safeId(classId);
final metaFile = File(p.join(cacheDir.path, '$safeId-success.json'));
if (!await metaFile.exists()) return {};
final data = jsonDecode(await metaFile.readAsString()) as Map<String, dynamic>;
return data;
}