eNextState NextDBOperation(AsyncIO *IO, IO_CallBack CB);
eNextState QueueDBOperation(AsyncIO *IO, IO_CallBack CB);
eNextState QueueEventContext(AsyncIO *IO, IO_CallBack CB);
eNextState NextDBOperation(AsyncIO *IO, IO_CallBack CB);
eNextState QueueDBOperation(AsyncIO *IO, IO_CallBack CB);
eNextState QueueEventContext(AsyncIO *IO, IO_CallBack CB);