NHibernate and Structure Map

Question

So I really like working with NHibernate but always used Spring.Net with it.

I recently came across StructureMap by Jeremy Miller and really like it better than Sp

Answer 1

So, I apologize that we did not get the NHibernate with StructureMap example done earlier. Eventually, I would like to publish it in the StructureMap documentation, but I need some feedback first. You can see the full example on my blog:

http://trason.net/journal/2009/10/7/bootstrapping-nhibernate-with-structuremap.html

That being said, I can hit the highlights here. There is an NHibernateRegistry that makes available four things: an NHibernate.Configuration (as a Singleton), an ISessionFactory (as a Singleton), an ISession (scoped Hybrid (HttpContext if available, falling back to Thread local storage)), and a very simple IUnitOfWork. Also, there is an HttpModule to manage the UnitOfWork per web request.

Here is the code for the NHibernateRegistry:

using NHibernate;
using NHibernate.ByteCode.Castle;
using NHibernate.Cfg;
using NHibernate.Dialect;
using NHibernate.Driver;
using NHibernateBootstrap.Core.Domain;
using StructureMap.Attributes;
using StructureMap.Configuration.DSL;
using Environment=NHibernate.Cfg.Environment;

namespace NHibernateBootstrap.Core.Persistence
{
    public class NHibernateRegistry : Registry
    {
        public NHibernateRegistry()
        {
            var cfg = new Configuration()
                .SetProperty(Environment.ReleaseConnections, "on_close")
                .SetProperty(Environment.Dialect, typeof(SQLiteDialect).AssemblyQualifiedName)
                .SetProperty(Environment.ConnectionDriver, typeof(SQLite20Driver).AssemblyQualifiedName)
                .SetProperty(Environment.ConnectionString, "data source=bootstrap.sqlite;Version=3")
                .SetProperty(Environment.ProxyFactoryFactoryClass, typeof(ProxyFactoryFactory).AssemblyQualifiedName)
                .AddAssembly(typeof(Blog).Assembly);

            var sessionFactory = cfg.BuildSessionFactory();

            ForRequestedType().AsSingletons().TheDefault.IsThis(cfg);

            ForRequestedType().AsSingletons()
                .TheDefault.IsThis(sessionFactory);

            ForRequestedType().CacheBy(InstanceScope.Hybrid)
                .TheDefault.Is.ConstructedBy(ctx => ctx.GetInstance().OpenSession());

            ForRequestedType().CacheBy(InstanceScope.Hybrid)
                .TheDefaultIsConcreteType();

                ForRequestedType().TheDefaultIsConcreteType();
        }
    }
}

Here is the code for the Unit of Work:

using System;
using NHibernate;

namespace NHibernateBootstrap.Core.Persistence
{
    public interface IUnitOfWork : IDisposable
    {
        ISession CurrentSession { get; }
        void Commit();  
    }
}

using NHibernate;

namespace NHibernateBootstrap.Core.Persistence
{
    public class UnitOfWork : IUnitOfWork
    {
        private readonly ISessionFactory _sessionFactory;
        private readonly ITransaction _transaction;

        public UnitOfWork(ISessionFactory sessionFactory)
        {
            _sessionFactory = sessionFactory;
            CurrentSession = _sessionFactory.OpenSession();
            _transaction = CurrentSession.BeginTransaction();
        }

        public ISession CurrentSession { get; private set;}

        public void Dispose()
        {
            CurrentSession.Close();
            CurrentSession = null;
        }

        public void Commit()
        {
            _transaction.Commit();
        }
    }
}

Here is the NHibernateModule for web applications:

using System;
using System.Web;
using NHibernateBootstrap.Core.Persistence;
using StructureMap;

namespace NHibernateBootstrap.Web
{
    public class NHibernateModule : IHttpModule
    {
        private IUnitOfWork _unitOfWork;

        public void Init(HttpApplication context)
        {
            context.BeginRequest += ContextBeginRequest;
            context.EndRequest += ContextEndRequest;
        }

        private void ContextBeginRequest(object sender, EventArgs e)
        {
            _unitOfWork = ObjectFactory.GetInstance();

        }

        private void ContextEndRequest(object sender, EventArgs e)
        {
            Dispose();
        }

        public void Dispose()
        {
            _unitOfWork.Dispose();
        }
    }
}