public ISession OpenSession(String alias)
{
if (alias == null)
{
throw new ArgumentNullException("alias");
}
ITransaction transaction = ObtainCurrentTransaction();
bool weAreSessionOwner = false;
SessionDelegate wrapped = sessionStore.FindCompatibleSession(alias);
ISession session;
if (wrapped == null)
{
session = CreateSession(alias); weAreSessionOwner = true;
wrapped = WrapSession(transaction != null, session);
sessionStore.Store(alias, wrapped);
EnlistIfNecessary(weAreSessionOwner, transaction, wrapped);
}
else
{
EnlistIfNecessary(weAreSessionOwner, transaction, wrapped);
wrapped = WrapSession(true, wrapped.InnerSession);
}
return(wrapped);
}
public void Remove(SessionDelegate session)
{
Stack stack = (Stack)session.SessionStoreCookie;
if (stack == null)
{
throw new InvalidProgramException("AbstractSessionStore.Remove called " +
"with no cookie - no pun intended");
}
if (stack.Count == 0)
{
throw new InvalidProgramException("AbstractSessionStore.Remove called " +
"for an empty stack");
}
ISession current = stack.Peek() as ISession;
if (session != current)
{
throw new InvalidProgramException("AbstractSessionStore.Remove tried to " +
"remove a session which is not on the top or not in the stack at all");
}
stack.Pop();
}
public void Store(String alias, SessionDelegate session)
{
Stack stack = GetStackFor(alias);
stack.Push(session);
session.SessionStoreCookie = stack;
}
protected bool EnlistIfNecessary(bool weAreSessionOwner,
ITransaction transaction,
SessionDelegate session)
{
if (transaction == null)
{
return(false);
}
IList list = (IList)transaction.Context["nh.session.enlisted"];
bool shouldEnlist;
if (list == null)
{
list = new ArrayList();
transaction.Context["nh.session.enlisted"] = list;
shouldEnlist = true;
}
else
{
shouldEnlist = true;
foreach (ISession sess in list)
{
if (SessionDelegate.AreEqual(session, sess))
{
shouldEnlist = false;
break;
}
}
}
if (shouldEnlist)
{
// TODO: propagate IsolationLevel, expose as transaction property
transaction.Enlist(new ResourceAdapter(session.BeginTransaction()));
list.Add(session);
if (weAreSessionOwner)
{
transaction.RegisterSynchronization(
new SessionDisposeSynchronization(session));
}
}
return(true);
}
public static bool AreEqual(ISession left, ISession right)
{
SessionDelegate sdLeft = left as SessionDelegate;
SessionDelegate sdRight = right as SessionDelegate;
if (sdLeft != null && sdRight != null)
{
return(Object.ReferenceEquals(sdLeft.inner, sdRight.inner));
}
else
{
throw new NotSupportedException("AreEqual: left is " +
left.GetType().Name + " and right is " + right.GetType().Name);
}
}
public SessionDisposeSynchronization(SessionDelegate session)
{
this.session = session;
}
