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After you have designed your overall architecture, you can start thinking about the underlying data store. In the example, the data store will consist of an XML file for the users and an XML file for the roles. To make access to these files as simple as possible, you will use XML serialization as the primary mechanism for reading from and writing to these files. Therefore, you need some classes to hold the data stored to the XML files either as public fields or as properties, as follows: Public Class SimpleUser Public UserKey As Guid = Guid.Empty Public UserName As String.Empty Public Password As String.Empty Public Public Public Public Public Public Public Public End Class Email As String.Empty CreationDate As DateTime = DateTime.Now LastActivityDate As DateTime = DateTime.MinValue LastLoginDate As DateTime = DateTime.MinValue LastPasswordChangeDate As DateTime = DateTime.MinValue PasswordQuestion As String.Empty PasswordAnswer As String.Empty Comment As String

If you build an in-house WCF application, another alternative you have is to host your WCF service library from within a dedicated Windows service. One benefit of doing so is that you can configure a Windows service to start automatically when the target machine boots up. Another benefit is that

Windows services run invisibly in the background (unlike your console application) and do not require user interactivity. Next, you will learn how to build such a host. Begin by creating a new Windows service project named MathWindowsServiceHost (see Figure 25-12). Once you do this, rename your initial Service1.cs file to MathWinService.cs using Solution Explorer.

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Public Class SimpleRole Public RoleName As String.Empty Public AssignedUsers As New StringCollection() End Class In this example, you will use a GUID as ProviderUserKey for uniquely identifying users in your store. For every user you will then store a user name, a password (hashed), an e-mail, some date information, a password question and answer, and some comments. For the roles, you will store a name as well as the association to the users. For simplicity, every role will contain an array of user names (which are strings) that are associated with this role. The serialized version of an array of users will be the user store, while the serialized version of an array of roles will be the roles store, as shown in Figure 26-3.

Now assume you have set a reference to your MathServiceLibrary.dll and System.ServiceModel.dll assemblies. All you need to do is use the ServiceHost type in the OnStart() and OnStop() methods of your Windows service type. Open the code file for your service host class (by right-clicking the designer and selecting View Code) and add the following logic: // Be sure to import these namespaces: using MathServiceLibrary; using System.ServiceModel; namespace MathWindowsServuceHost { public partial class MathWinService: ServiceBase { // A member variable of type ServiceHost. private ServiceHost myHost; public MathWinService() {

Another design aspect you have to think about is how to access the store. Basically, for every store, you need only one instance in memory in order to save resources and avoid loading the XML files too often. You can implement this through the Singleton pattern, which is a solution for ensuring that only one instance of a class exists within a process. It does this by making the constructor private and providing a public Shared method for retrieving an instance. This public method verifies whether the instance already exists, and if not, it automatically creates an instance of its own, which is then returned. Let s examine all these aspects based on the UserStore class introduced in Figure 26-3: Private _FileName As String Private _Users As List(Of SimpleUser) Private _Serializer As XmlSerializer

SQL HQL HibernateDaoSupport SELECT * FROM USERS WHERE user_age > 28 ORDER BY user_age; from User u where userAge>28 order by u.userAge

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