This isn't threadsafe:
public ISessionFactory SessionFactory
{
get { return this.sessionFactory ?? (this.sessionFactory =
this.ConfigurationGenerator.Generate().BuildSessionFactory()); }
}
I suggest you take a look at how sharp architecture does it:
http://github.com/paulbatum/Sharp-Architecture/blob/master/src/SharpArch/SharpArch.Data/NHibernate/NHibernateInitializer.cs
On Wed, Feb 17, 2010 at 8:03 PM, Schlaefisch <schlaefi...@googlemail.com>wrote:
> We have a WebSessionManager implemented as singleton which creates the
> sessionfactory, using fluent configuration, as needed.
>
> Here is the relevant code:
>
> public class WebSessionManager : ISessionManager
> {
> private static WebSessionManager sessionManager;
> private ISessionFactory sessionFactory;
> private IConfigurationGenerator configurationGenerator;
>
> public static WebSessionManager Instance
> {
> get { return sessionManager ?? (sessionManager = new
> WebSessionManager()); }
> }
> public ISession Session
> {
> get
> {
> if (!
> ManagedWebSessionContext.HasBind(HttpContext.Current,
> this.SessionFactory))
> {
> ManagedWebSessionContext.Bind(HttpContext.Current,
> this.SessionFactory.OpenSession());
> }
> return
> this.SessionFactory.GetCurrentSession();
> }
> }
> public ISessionFactory SessionFactory
> {
> get { return this.sessionFactory ?? (this.sessionFactory =
> this.ConfigurationGenerator.Generate().BuildSessionFactory()); }
> }
> }
>
> public class ConfigurationGenerator : IConfigurationGenerator
> {
> private readonly string connectionString;
> private readonly string sessionContext; // Here: "managed_web"
>
> public FluentConfiguration Generate()
> {
> FluentConfiguration config = Fluently.Configure()
>
> .Database(MsSqlConfiguration.MsSql2005.ConnectionString(this.connectionString)
> .ShowSql().CurrentSessionContext(this.sessionContext))
> .Mappings(m =>
> m.FluentMappings.AddFromAssemblyOf<IConfigurationGenerator>());
> return config;
> }
> }
>
>
> On Feb 16, 4:58 pm, James Gregory <jagregory....@gmail.com> wrote:
> > Where and how are you creating your session factory?
> >
> > On Tue, Feb 16, 2010 at 3:06 PM, Schlaefisch <schlaefi...@googlemail.com
> >wrote:
> >
> > > Hi,
> >
> > > we're using fluent NHibernate within a SharePoint 2007 WebPart.
> > > Everything works fine except for one problem:
> >
> > > If we reset the web server and 2 (or more) users try to browse the
> > > WebPart, the session factory is created twice at the same time,
> > > resulting in a null reference exception.
> >
> > > Is there any standard approach to prevent this?
> >
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