The unit of work pattern within a asp.net mvc application

Question

I have been looking at this excellant blog titled \"NHibernate and the Unit of Work Pattern\" and have a question regarding the best place to use UnitOfWork.Start in a asp.net m

Answer 1

With the unit of work pattern, you don't put every dataaccess method in a separate unit of work. You use the unit of work around the whole work that needs to be done, which is in most cases in a web application a webrequest. The idea is that a request can fail, or succeed. When you add 2 items to the database during one request, the should be both added, or not. Not just one of them. In most cases, the easiest way to start a unit of work in a mvc (or other web) application is in the begin and end request methods of the global.asax

class Global
{
    BeginRequest()
    {
        servicelocater.get().start();
    }

    EndRequest()
    {
        var unit = servicelocater.Get();
        try
        {
            unit.commit();
        }
        catch
        {
            unit.rollback();
            throw;
        }
    }
}

class Repository
{
     public Repository(INHibernateUnitofwork unitofwork)
     {
         this.unitofwork = unitofwork;
     }

     public void Add(T entity)
     {
         unitofwork.session.save(entity);
     }
}