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POImplementing UnitOfWork with Castle.Windsor
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  1. POImplementing UnitOfWork with Castle.Windsor
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    copied!<p>Simple question.</p> <blockquote> <p><strong>How do I use UnitOfWork with Castle.Windsor, nHibernate, and ASP.NET MVC?</strong></p> </blockquote> <p>Now for the extended details. In my quest to understand the <code>UnitOfWork</code> pattern, I'm having difficulty coming across anything that uses a direct example in conjunction with <code>Castle.Windsor</code>, specifically in regards to the way it needs to be installed. </p> <p>Here is my understanding so far.</p> <h2>IUnitOfWork</h2> <ul> <li>The <code>IUnitOfWork</code> interface is used to declare the pattern</li> <li>The <code>UnitOfWork</code> class must <code>Commit</code> and <code>Rollback</code> transactions, and Expose a <code>Session</code>.</li> </ul> <p>So with that said, here is my <code>IUnitOfWork</code>. (I am using <code>Fluent nHibernate</code>)</p> <pre><code>public interface IUnitOfWork : IDisposable { ISession Session { get; private set; } void Rollback(); void Commit(); } </code></pre> <p>So here is my <code>Castle.Windsor</code> Container Bootstrapper (ASP.NET MVC)</p> <pre><code>public class WindsorContainerFactory { private static Castle.Windsor.IWindsorContainer container; private static readonly object SyncObject = new object(); public static Castle.Windsor.IWindsorContainer Current() { if (container == null) { lock (SyncObject) { if (container == null) { container = new Castle.Windsor.WindsorContainer(); container.Install(new Installers.SessionInstaller()); container.Install(new Installers.RepositoryInstaller()); container.Install(new Installers.ProviderInstaller()); container.Install(new Installers.ControllerInstaller()); } } } return container; } } </code></pre> <p>So now, in my <code>Global.asax</code> file, I have the following...</p> <pre><code> protected void Application_Start() { AreaRegistration.RegisterAllAreas(); RegisterGlobalFilters(GlobalFilters.Filters); RegisterRoutes(RouteTable.Routes); // Register the Windsor Container ControllerBuilder.Current .SetControllerFactory(new Containers.WindsorControllerFactory()); } </code></pre> <h2>Repository</h2> <p>Now I understand that I need to pass the <code>ISession</code> to my Repository. So then, let me assume <code>IMembershipRepository</code>.</p> <pre><code>class MembershipRepository : IMembershipRepository { private readonly ISession session; public MembershipRepository(ISession session) { this.session = session; } public Member RetrieveMember(string email) { return session.Query&lt;Member&gt;().SingleOrDefault( i =&gt; i.Email == email ); } } </code></pre> <p>So I am confused, now. Using this method, the <code>ISession</code> doesn't get destroyed properly, and the <code>UnitOfWork</code> never gets used. </p> <p>I've been informed that <code>UnitOfWork</code> needs to go in the Web Request Level - but I cannot find anything explaining how to actually go about this. I do not use a <code>ServiceLocator</code> of any sort ( as when I tried, I was told this was also bad practice... ).</p> <blockquote> <blockquote> <p>Confusion -- How does a <code>UnitOfWork</code> get created?</p> </blockquote> <p>I just don't understand this, in general. My thought was that I would start passing <code>UnitOfWork</code> into the <code>Repository</code> constructors - but if it has to go in the Web Request, I'm not understanding where the two relate.</p> </blockquote> <h2>Further Code</h2> <p>This is extra code for clarification, simply because I seem to have a habit of never providing the right information for my questions.</p> <h2>Installers</h2> <pre><code>public class ControllerInstaller : IWindsorInstaller { public void Install(IWindsorContainer container, IConfigurationStore store) { container.Register( AllTypes.FromThisAssembly() .BasedOn&lt;IController&gt;() .Configure(c =&gt; c.LifeStyle.Transient)); } } public class ProviderInstaller : IWindsorInstaller { public void Install(IWindsorContainer container, IConfigurationStore store) { container.Register( Component .For&lt;Membership.IFormsAuthenticationProvider&gt;() .ImplementedBy&lt;Membership.FormsAuthenticationProvider&gt;() .LifeStyle.Singleton ); } } public class RepositoryInstaller : IWindsorInstaller { public void Install(IWindsorContainer container, IConfigurationStore store) { container.Register( Component .For&lt;Membership.IMembershipRepository&gt;() .ImplementedBy&lt;Membership.MembershipRepository&gt;() .LifeStyle.Transient ); container.Register( Component .For&lt;Characters.ICharacterRepository&gt;() .ImplementedBy&lt;Characters.CharacterRepository&gt;() .LifeStyle.Transient ); } } public class SessionInstaller : Castle.MicroKernel.Registration.IWindsorInstaller { private static ISessionFactory factory; private static readonly object SyncObject = new object(); public void Install(Castle.Windsor.IWindsorContainer container, IConfigurationStore store) { container.Register( Component.For&lt;ISessionFactory&gt;() .UsingFactoryMethod(SessionFactoryFactory) .LifeStyle.Singleton ); container.Register( Component.For&lt;ISession&gt;() .UsingFactoryMethod(c =&gt; SessionFactoryFactory().OpenSession()) .LifeStyle.Transient ); } private static ISessionFactory SessionFactoryFactory() { if (factory == null) lock (SyncObject) if (factory == null) factory = Persistence.SessionFactory.Map(System.Web.Configuration.WebConfigurationManager.ConnectionStrings["Remote"].ConnectionString); return factory; } } </code></pre> <h2>UnitOfWork</h2> <p>Here is my <code>UnitOfWork</code> class verbatim.</p> <pre><code>public class UnitOfWork : IUnitOfWork { private readonly ISessionFactory sessionFactory; private readonly ITransaction transaction; public UnitOfWork(ISessionFactory sessionFactory) { this.sessionFactory = sessionFactory; Session = this.sessionFactory.OpenSession(); transaction = Session.BeginTransaction(); } public ISession Session { get; private set; } public void Dispose() { Session.Close(); Session = null; } public void Rollback() { if (transaction.IsActive) transaction.Rollback(); } public void Commit() { if (transaction.IsActive) transaction.Commit(); } } </code></pre>
 

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