value method

@override Future<Map<String, dynamic>?> value(String key)

Retrieves the value at key or null if there is no data.

Implementation

@override
Future<Map<String, dynamic>?> value(String key) {
  return _mutex.protectRead(() async {
    final inMemoryValue = _memory[key];
    if (inMemoryValue != null) {
      return Map<String, dynamic>.of(inMemoryValue);
    }
    final localStorageValue = await _level2.value(key);
    if (localStorageValue != null) {
      _memory[key] = localStorageValue;
      return Map<String, dynamic>.of(localStorageValue);
    }
    return null;
  });
}