Spring.Data.NHibernate.SessionFactoryUtils.ProcessDeferredClose C# (CSharp) Method

        public static void ProcessDeferredClose(ISessionFactory sessionFactory) 
        {
            AssertUtils.ArgumentNotNull(sessionFactory, "No SessionFactory specified");

            IDictionary holderDictionary = LogicalThreadContext.GetData(DeferredCloseHolderDataSlotName) as IDictionary;
          
            if (holderDictionary == null || !holderDictionary.Contains(sessionFactory)) 
            {
                throw new InvalidOperationException("Deferred close not active for SessionFactory [" + sessionFactory + "]");
            }
            log.Debug("Processing deferred close of Hibernate Sessions");
            Set sessions = (Set) holderDictionary[sessionFactory];
            holderDictionary.Remove(sessionFactory);
            foreach (ISession session in sessions)
            {
                CloseSession(session);
            }

            if (holderDictionary.Count == 0)
            {
                LogicalThreadContext.FreeNamedDataSlot(DeferredCloseHolderDataSlotName);
            }


        }