We've got plenty of tests around it and it works quite well and has worked quite well for months given our requirements. My #1 concern is how to figure out whats going on with this exception so that I can finish implementing this feature.
But an explanation is in order: We have a legacy requirement that certain properties on certain entities are defined in meta-data (stored in xml) and can be added or remobved by the user during run-time. We are also locked into an implementation where adding a property will actually issue an ALTER TABLE command to add properties to tables. We are also locked in (and this has been debated plenty) to having to do this adjustment during runtime, not in a separate "adjust meta-data" utility. I know, not good design but like I said, locked in. The good news: This happens very infrequently. There is a flurry of activity when the application is first deployed and then settles down to a very rare occurrence. As such, the performance hit from reconfiguring the SessionFactory has been deemed acceptable. Also they are ONLY adding properties and only from a certain well-defined set of property types as such it is relatively straightforward to convert their meta-data to hbm. In our solution I wrote a simple decorator for ISessionFactory that subscribes to a DomainMetaDataEvent from our event aggregator and in response rebuilds the hbm mappings, adds them to a new Configuration object and rebuilds its internal SessionFactory. The ability to expand on the entities themselves is implemented using dynamic- component and a bit of c# 4.0 dynamic magic. Again, this is a rare occurrence and has been deemed acceptable in our tests so far. We also have strict guidelines of when we use entities and when we don't. For example, for pulling out bulk amounts of data (like for reporting or into a grid) we interrogate the mappings inside NH and use the persisters to build up our own SQL query which is mapped by a separate process to a set of DTOs. We basically only use the dynamic entities for CUD or when we are going to be working with a very small set at a time. Makes sense? On Aug 29, 4:03 pm, Fabio Maulo <[email protected]> wrote: > My mayor preocupation is this name: MutableSessionFactory > > -- > Fabio Maulo > > El 29/08/2010, a las 15:03, George Mauer <[email protected]> escribió: > > After a recent refactoring NHibernate 2.1.2.4 started throwing a > KeyNotFoundException when the SessionFactory is being configured. No > other information is supplied, not even the key that is not found. > > The stacktrace is pasted below. Clearly some mapping registration is > going wrong. > > What exactly are my options for tracking down the error? Compiling NH > from source would be a huge hassle since we use other libraries that > depend on specific versions for it (such as NH.Linq). > > at System.Collections.Generic.Dictionary`2.get_Item(TKey key) > at NHibernate.Cfg.Configuration.Mapping.GetPersistentClass(String > className) > at NHibernate.Cfg.Configuration.Mapping.GetIdentifierType(String > className) > at NHibernate.Type.EntityType.GetIdentifierType(IMapping factory) > at NHibernate.Type.EntityType.GetIdentifierOrUniqueKeyType(IMapping > factory) > at > NHibernate.Persister.Entity.AbstractPropertyMapping.InitIdentifierPropertyP > aths(String > path, EntityType etype, String[] columns, IMapping factory) > at > NHibernate.Persister.Entity.AbstractPropertyMapping.InitPropertyPaths(Strin g > path, IType type, String[] columns, String[] formulaTemplates, > IMapping factory) > at > NHibernate.Persister.Entity.AbstractEntityPersister.InitOrdinaryPropertyPat > hs(IMapping > mapping) > at > NHibernate.Persister.Entity.AbstractEntityPersister.InitPropertyPaths(IMapp > ing > mapping) > at > NHibernate.Persister.Entity.AbstractEntityPersister.PostConstruct(IMapping > mapping) > at > NHibernate.Persister.Entity.SingleTableEntityPersister..ctor(PersistentClas s > persistentClass, ICacheConcurrencyStrategy cache, > ISessionFactoryImplementor factory, IMapping mapping) > at > NHibernate.Persister.PersisterFactory.CreateClassPersister(PersistentClass > model, ICacheConcurrencyStrategy cache, ISessionFactoryImplementor > factory, IMapping cfg) > at NHibernate.Impl.SessionFactoryImpl..ctor(Configuration cfg, > IMapping mapping, Settings settings, EventListeners listeners) > at NHibernate.Cfg.Configuration.BuildSessionFactory() > at PCS.Data.NHibernate.MutableSessionFactory.CreateSessionFactory() > in W:\PCS\GeorgeDev\Src\PCS\PCS.Data.NHibernate > \MutableSessionFactory.cs:line 27 > > -- > You received this message because you are subscribed to the Google Groups > "nhusers" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group > athttp://groups.google.com/group/nhusers?hl=en. -- You received this message because you are subscribed to the Google Groups "nhusers" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/nhusers?hl=en.
