NHibernate Session Management Filter for WebApi

NhSessionManagementAttribute.cs

    public class NhSessionManagementAttribute : ActionFilterAttribute
    {
        public NhSessionManagementAttribute()
        {
            SessionFactory = MvcApplication.SessionFactory;
        }

        private ISessionFactory SessionFactory { get; set; }

        public override void OnActionExecuting(HttpActionContext actionContext)
        {
            var session = SessionFactory.OpenSession();
            CurrentSessionContext.Bind(session);
            session.BeginTransaction();
        }

        public override void OnActionExecuted(HttpActionExecutedContext actionExecutedContext)
        {
            var session = SessionFactory.GetCurrentSession();
            var transaction = session.Transaction;
            if (transaction != null && transaction.IsActive)
            {
                transaction.Commit();
            }
            session = CurrentSessionContext.Unbind(SessionFactory);
            session.Close();
        }
    }
    
     public class MvcApplication : System.Web.HttpApplication
    {
        public static ISessionFactory SessionFactory
        {
            get;
            private set;
        }
        public static Configuration Configuration { get; set; }

        protected void Application_Start()
        {
           SessionFactory= BuildSessionFactory();
        }

        private ISessionFactory BuildSessionFactory()
        {
            return Fluently.Configure()
                .Database(MsSqlConfiguration.MsSql2008.ConnectionString(c => c.FromConnectionStringWithKey("default")).ShowSql())
                .Mappings(m => m.FluentMappings.AddFromAssemblyOf<TaskMap>())
                .ExposeConfiguration(cfg =>
                {
                    cfg.SetInterceptor(new TrackingNumberInterceptor());
                    cfg.CurrentSessionContext<WebSessionContext>();
                    Configuration = cfg;
                })
                .BuildSessionFactory();
        }
    }
    
    public class CustomApiController
        : ApiController
    {
        protected ISession Session
        {
            get { return MvcApplication.SessionFactory.GetCurrentSession(); }
        }
        
    }