a.swift

/// A protocol used for saving and loading from storage
public protocol StorageAware {
  func object<T: Codable>(ofType type: T.Type, forKey key: String) throws -> T
  func entry<T: Codable>(ofType type: T.Type, forKey key: String) throws -> Entry<T>
  func removeObject(forKey key: String) throws
  func setObject<T: Codable>(_ object: T, forKey key: String, expiry: Expiry?) throws
  func existsObject<T: Codable>(ofType type: T.Type, forKey key: String) throws -> Bool
  func removeAll() throws
  func removeExpiredObjects() throws
}