private void HandlePersistableMessage(PersistableMessage message)
 {
     state.Add(message);
 }
 public PersistenceStateItem(PersistableMessage message)
 {
     Message   = message;
     Timestamp = DateTime.UtcNow;
     Saved     = false;
 }
 private void HandlePersistableMessageCommand(PersistableMessage message)
 {
     Persist(message, HandlePersistableMessage);
 }
 public void Add(PersistableMessage message)
 {
     Items.Add(new PersistenceStateItem(message));
 }