Module memory

Structs

• Proxy
  An object database to read from any implementation but write to memory. Previously written objects can be returned from memory upon query, which makes the view of objects consistent. In-Memory objects can be disabled by taking out its storage. From there in-memory object can also be persisted one by one.
• Storage
  A mapping between an object id and all data corresponding to an object, acting like a HashMap<ObjectID, (Kind, Data)>.