1namespace momoney.database.transactions
 2{
 3    public interface ISessionProvider
 4    {
 5        ISession get_the_current_session();
 6    }
 7
 8    public class SessionProvider : ISessionProvider
 9    {
10        readonly IContext context;
11        readonly IKey<ISession> session_key;
12
13        public SessionProvider(IContext context, IKey<ISession> session_key)
14        {
15            this.context = context;
16            this.session_key = session_key;
17        }
18
19        public ISession get_the_current_session()
20        {
21            if (!context.contains(session_key)) throw new SessionNotStartedException();
22            return context.value_for(session_key);
23        }
24    }
25}