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NHibernate Templates for Smart Code Generator

, 11 Dec 2007 CPOL 142K 1.6K 128
Describes how to generate NHibernate objects and ASPX pages using Smart Code
nhibernate.zip
NHibernate
Everything-1.0.suo
Newin.scp
NHibernate
bin
Debug
NHibernateTemplates.dll
NHibernateTemplates.pdb
SmartCode.Model.DLL
SmartCode.Template.dll
mssccprj.scc
NHibernate.csproj.vspscc
NHibernateTemplates.csproj.user
Properties
vssver2.scc
vssver2.scc
Northwind
Northwind.Core
bin
Debug
Northwind.Core.dll
NorthwindDomain.dll
ProjectBase.Utils.dll
DataInterfaces
vssver2.scc
Domain
vssver2.scc
Hbm
vssver2.scc
mssccprj.scc
nhibernate-mapping.xsx
Northwind.Core.csproj.vspscc
Properties
vssver2.scc
vssver2.scc
Northwind.Data
bin
Debug
Northwind.Core.dll
Northwind.Data.dll
ProjectBase.Data.dll
ProjectBase.Utils.dll
Manager
vssver2.scc
mssccprj.scc
Northwind.Data.csproj.vspscc
Properties
vssver2.scc
vssver2.scc
Northwind.Web
bin
Castle.DynamicProxy.dll
Iesi.Collections.dll
Northwind.Core.dll
Northwind.Data.dll
Northwind.Web.dll
ProjectBase.Utils.dll
mssccprj.scc
Northwind.Web.csproj.user
Northwind.Web.csproj.vspscc
Properties
vssver2.scc
Utils
vssver2.scc
vssver2.scc
ProjectBase.Utils
bin
Debug
log4net.dll
ProjectBase.Utils.dll
ProjectBase.Utils.pdb
mssccprj.scc
ProjectBase.Utils.csproj.vspscc
Properties
vssver2.scc
vssver2.scc
Web
vssver2.scc
WebTemplates
bin
Debug
SmartCode.Model.DLL
SmartCode.Template.dll
WebTemplates.dll
WebTemplates.pdb
Edit
vssver2.scc
List
vssver2.scc
mssccprj.scc
obj
Debug
Refactor
ResolveAssemblyReference.cache
TempPE
WebTemplates.dll
WebTemplates.pdb
Properties
vssver2.scc
vssver2.scc
WebTemplates.csproj.user
WebTemplates.csproj.vspscc
using System.Runtime.Remoting.Messaging;
using System.Web;
using NHibernate;
using NHibernate.Cache;
using NHibernate.Cfg;
using ProjectBase.Utils;

namespace Northwind.Data
{
    /// <summary>
    /// Handles creation and management of sessions and transactions.  It is a singleton because 
    /// building the initial session factory is very expensive. Inspiration for this class came 
    /// from Chapter 8 of Hibernate in Action by Bauer and King.  Although it is a sealed singleton
    /// you can use TypeMock (http://www.typemock.com) for more flexible testing.
    /// </summary>
    public sealed class NHibernateSessionManager
    {
        #region Thread-safe, lazy Singleton

        /// <summary>
        /// This is a thread-safe, lazy singleton.  See http://www.yoda.arachsys.com/csharp/singleton.html
        /// for more details about its implementation.
        /// </summary>
        public static NHibernateSessionManager Instance
        {
            get
            {
                return Nested.NHibernateSessionManager;
            }
        }

        /// <summary>
        /// Initializes the NHibernate session factory upon instantiation.
        /// </summary>
        private NHibernateSessionManager()
        {
            InitSessionFactory();
        }

        /// <summary>
        /// Assists with ensuring thread-safe, lazy singleton
        /// </summary>
        private class Nested
        {
            static Nested() { }
            internal static readonly NHibernateSessionManager NHibernateSessionManager =
                new NHibernateSessionManager();
        }

        #endregion

        private void InitSessionFactory()
        {
            sessionFactory = new Configuration().Configure().BuildSessionFactory();
        }

        /// <summary>
        /// Allows you to register an interceptor on a new session.  This may not be called if there is already
        /// an open session attached to the HttpContext.  If you have an interceptor to be used, modify
        /// the HttpModule to call this before calling BeginTransaction().
        /// </summary>
        public void RegisterInterceptor(IInterceptor interceptor)
        {
            ISession session = ContextSession;

            if (session != null && session.IsOpen)
            {
                throw new CacheException("You cannot register an interceptor once a session has already been opened");
            }

            GetSession(interceptor);
        }

        public ISession GetSession()
        {
            return GetSession(null);
        }

        /// <summary>
        /// Gets a session with or without an interceptor.  This method is not called directly; instead,
        /// it gets invoked from other public methods.
        /// </summary>
        private ISession GetSession(IInterceptor interceptor)
        {
            ISession session = ContextSession;

            if (session == null)
            {
                if (interceptor != null)
                {
                    session = sessionFactory.OpenSession(interceptor);
                }
                else
                {
                    session = sessionFactory.OpenSession();
                }

                ContextSession = session;
            }

            Check.Ensure(session != null, "session was null");

            return session;
        }

        /// <summary>
        /// Flushes anything left in the session and closes the connection.
        /// </summary>
        public void CloseSession()
        {
            ISession session = ContextSession;

            if (session != null && session.IsOpen)
            {
                session.Flush();
                session.Close();
            }

            ContextSession = null;
        }

        public void BeginTransaction()
        {
            ITransaction transaction = ContextTransaction;

            if (transaction == null)
            {
                transaction = GetSession().BeginTransaction();
                ContextTransaction = transaction;
            }
        }

        public void CommitTransaction()
        {
            ITransaction transaction = ContextTransaction;

            try
            {
                if (HasOpenTransaction())
                {
                    transaction.Commit();
                    ContextTransaction = null;
                }
            }
            catch (HibernateException)
            {
                RollbackTransaction();
                throw;
            }
        }

        public bool HasOpenTransaction()
        {
            ITransaction transaction = ContextTransaction;

            return transaction != null && !transaction.WasCommitted && !transaction.WasRolledBack;
        }

        public void RollbackTransaction()
        {
            ITransaction transaction = ContextTransaction;

            try
            {
                if (HasOpenTransaction())
                {
                    transaction.Rollback();
                }

                ContextTransaction = null;
            }
            finally
            {
                CloseSession();
            }
        }

        /// <summary>
        /// If within a web context, this uses <see cref="HttpContext" /> instead of the WinForms 
        /// specific <see cref="CallContext" />.  Discussion concerning this found at 
        /// http://forum.springframework.net/showthread.php?t=572.
        /// </summary>
        private ITransaction ContextTransaction
        {
            get
            {
                if (IsInWebContext())
                {
                    return (ITransaction)HttpContext.Current.Items[TRANSACTION_KEY];
                }
                else
                {
                    return (ITransaction)CallContext.GetData(TRANSACTION_KEY);
                }
            }
            set
            {
                if (IsInWebContext())
                {
                    HttpContext.Current.Items[TRANSACTION_KEY] = value;
                }
                else
                {
                    CallContext.SetData(TRANSACTION_KEY, value);
                }
            }
        }

        /// <summary>
        /// If within a web context, this uses <see cref="HttpContext" /> instead of the WinForms 
        /// specific <see cref="CallContext" />.  Discussion concerning this found at 
        /// http://forum.springframework.net/showthread.php?t=572.
        /// </summary>
        private ISession ContextSession
        {
            get
            {
                if (IsInWebContext())
                {
                    return (ISession)HttpContext.Current.Items[SESSION_KEY];
                }
                else
                {
                    return (ISession)CallContext.GetData(SESSION_KEY);
                }
            }
            set
            {
                if (IsInWebContext())
                {
                    HttpContext.Current.Items[SESSION_KEY] = value;
                }
                else
                {
                    CallContext.SetData(SESSION_KEY, value);
                }
            }
        }

        private bool IsInWebContext()
        {
            return HttpContext.Current != null;
        }

        private const string TRANSACTION_KEY = "CONTEXT_TRANSACTION";
        private const string SESSION_KEY = "CONTEXT_SESSION";
        private ISessionFactory sessionFactory;
    }
}

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This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Danilo Mendez
Web Developer
United States United States
Danilo is the creator of SmartRules, a Business Rules Engine. He is an industry consultant working primarily with companies interested in implementing dynamic rules programming concepts to add flexibility to their architectures on web, CE, and desktop platforms. He operates his own website, Kontac, where you will find more information.

To contact Danilo, email him at danilo.mendez@gmail.com.

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