NH bug workaround

nhuow.cs

  void IManageUnitsOfWork.End(Exception ex)
        {
            if (SessionFactory == null || currentSession == null) return;


            if (ex != null)
            {
                Transaction.Current.Rollback(ex);
                while (Transaction.Current.TransactionInformation.Status != TransactionStatus.Aborted)
                {
                    Thread.SpinWait(20);
                }                
            }

            using (currentSession)
            using (currentSession.Transaction)
            {
                if (!currentSession.Transaction.IsActive)
                    return;

                if (ex != null)
                {
                    // Due to a race condition in NH3.3, explicit rollback can cause exceptions and corrupt the connection pool. 
                    // Especially if there are more than one NH session taking part in the DTC transaction
                    currentSession.Transaction.Rollback();
                }
                else
                    currentSession.Transaction.Commit();
            }
        }