Data Auditing in NHibernate and SqlServer

Question

I\'m using NHibernate on a project and I need to do data auditing. I found this article on codeproject which discusses the IInterceptor interface.

What is your pref

Answer 1

As an entirely different approach, you could use the decorator pattern with your repositories.

Say I have

public interface IRepository where EntityType:IAuditably
{ 
    public void Save(EntityType entity);
}

Then, we'd have our NHibernateRepository:

public class NHibernateRepository:IRepository
{
   /*...*/
   public void Save ( EntityType entity )
   {
       session.SaveOrUpdate(entity);
   }
}

Then we could have an Auditing Repository:

public class AuditingRepository:IRepository
{
   /*...*/
   public void Save ( EntityType entity )
   {
       entity.LastUser = security.CurrentUser;
       entity.LastUpdate = DateTime.UtcNow;
       innerRepository.Save(entity)
   }
}

Then, using an IoC Framework (StructureMap, Castle Windsor, NInject) you could build it all up without the rest of your code every knowing you had auditing going on.

Of course, how you audit the elements of cascaded collections is another issue entirely...