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NHibernate Best Practices with ASP.NET, 1.2nd Ed.

, 11 Jun 2008
This article describes best practices for leveraging the benefits of NHibernate 1.2, ASP.NET, generics and unit testing together.
basicsample.zip
BasicSample
BasicSample.Core
DataInterfaces
Domain
Properties
Utils
BasicSample.Data
Properties
BasicSample.resharper
BasicSample.resharper.user
BasicSample.Tests
Data
DaoTestDoubles
Domain
Properties
TestFactories
Web
BasicSample.Web
App_Code
Bin
BasicSample.Core.dll
BasicSample.Core.pdb
BasicSample.Data.dll
BasicSample.Data.pdb
Iesi.Collections.dll
log4net.dll
log4net.dll.refresh
NHibernate.dll
NHibernate.dll.refresh
Solution Items
Iesi.Collections.dll
log4net.dll
NHibernate.dll
nunit.framework.dll
NUnitAsp.dll
Rhino.Mocks.dll
enterprisesample.zip
EnterpriseSample
EnterpriseSample.Core
DataInterfaces
Domain
Dto
EnterpriseSample.Core.csproj.user
Properties
EnterpriseSample.Data
Properties
EnterpriseSample.Presenters
Properties
ViewInterfaces
EnterpriseSample.resharper
EnterpriseSample.resharper.user
EnterpriseSample.Tests
Data
DaoTestDoubles
Domain
Dto
Presenters
Properties
TestFactories
Web
EnterpriseSample.Web
App_Code
PageControllers
Bin
Castle.DynamicProxy.dll
Castle.MicroKernel.dll
Castle.Model.dll
Castle.Windsor.dll
Castle.Windsor.dll.refresh
EnterpriseSample.Core.dll
EnterpriseSample.Core.pdb
EnterpriseSample.Data.dll
EnterpriseSample.Data.pdb
EnterpriseSample.Presenters.dll
EnterpriseSample.Presenters.pdb
Iesi.Collections.dll
log4net.dll
log4net.dll.refresh
NHibernate.dll
NHibernate.dll.refresh
ProjectBase.Data.dll
ProjectBase.Data.pdb
ProjectBase.Utils.dll
ProjectBase.Utils.pdb
Config
EnterpriseSample.log
Global.asax
Views
ProjectBase.Data
NHibernateSessionMgmt
Properties
ProjectBase.Utils
Properties
Web
Solution Items
Castle.Core.dll
Castle.DynamicProxy.dll
Castle.Facilities.AutomaticTransactionManagement.dll
Castle.MicroKernel.dll
Castle.Model.dll
Castle.Services.Transaction.dll
Castle.Windsor.dll
Iesi.Collections.dll
log4net.dll
NHibernate.dll
nunit.framework.dll
NUnitAsp.dll
Rhino.Mocks.dll
nhibernatebestpractices_src.zip
NHibernateSample
NHibernateSample.Core
bin
DataInterfaces
Domain
Properties
NHibernateSample.Data
bin
Properties
NHibernateSample.Tests
bin
Data
Domain
MockDao
Properties
NHibernateSample.Web
App_Code
Bin
Castle.DynamicProxy.dll
Iesi.Collections.dll
Iesi.Collections.dll.refresh
log4net.dll
log4net.dll.refresh
NHibernate.dll
NHibernate.Generics.dll
NHibernateSample.Core.dll
NHibernateSample.Data.dll
Solution Items
Iesi.Collections.dll
log4net.dll
NHibernate.dll
NHibernate.Generics.dll
nunit.framework.dll
using BasicSample.Core.Utils;

namespace BasicSample.Core.Domain
{
    /// <summary>
    /// For a discussion of this object, see 
    /// http://devlicio.us/blogs/billy_mccafferty/archive/2007/04/25/using-equals-gethashcode-effectively.aspx
    /// </summary>
    public abstract class DomainObject<IdT>
    {
        /// <summary>
        /// ID may be of type string, int, custom type, etc.
        /// Setter is protected to allow unit tests to set this property via reflection and to allow 
        /// domain objects more flexibility in setting this for those objects with assigned IDs.
        /// </summary>
        public IdT ID {
            get { return id; }
            protected set { id = value; }
        }

        public override sealed bool Equals(object obj) {
            DomainObject<IdT> compareTo = obj as DomainObject<IdT>;

            return (compareTo != null) &&
                   (HasSameNonDefaultIdAs(compareTo) ||
                    // Since the IDs aren't the same, either of them must be transient to 
                    // compare business value signatures
                    (((IsTransient()) || compareTo.IsTransient()) &&
                     HasSameBusinessSignatureAs(compareTo)));
        }

        /// <summary>
        /// Transient objects are not associated with an item already in storage.  For instance,
        /// a <see cref="Customer" /> is transient if its ID is 0.
        /// </summary>
        public bool IsTransient() {
            return ID == null || ID.Equals(default(IdT));
        }

        /// <summary>
        /// Must be provided to properly compare two objects
        /// </summary>
        public abstract override int GetHashCode();

        private bool HasSameBusinessSignatureAs(DomainObject<IdT> compareTo) {
            Check.Require(compareTo != null, "compareTo may not be null");

            return GetHashCode().Equals(compareTo.GetHashCode());
        }

        /// <summary>
        /// Returns true if self and the provided persistent object have the same ID values 
        /// and the IDs are not of the default ID value
        /// </summary>
        private bool HasSameNonDefaultIdAs(DomainObject<IdT> compareTo) {
            Check.Require(compareTo != null, "compareTo may not be null");

            return (ID != null && ! ID.Equals(default(IdT))) &&
                   (compareTo.ID != null && ! compareTo.ID.Equals(default(IdT))) &&
                   ID.Equals(compareTo.ID);
        }

        private IdT id = default(IdT);
    }
}

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About the Author

Billy McCafferty
Web Developer
United States United States
No Biography provided

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