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The final operation, and probably the simplest, is to delete an object from the database. The framework actually supports two approaches to deleting objects. The first approach is called deferred deletion. In this model, the object is retrieved from the database and is marked for deletion by calling a Delete() method on the business object. Then the Save() or BeginSave() method is called to cause the object to update itself to the database (thus actually doing the Delete operation). In this case, the data is deleted by the DataPortal_DeleteSelf() method. The second approach, called immediate deletion, consists of simply passing criteria data to the server, where the object is deleted immediately within the DataPortal_Delete() method. This second approach provides superior performance because you don t need to load the object s data and return it to the client. Instead, you simply pass the criteria fields to the server, where the object deletes its data. The framework supports both models, providing you with the flexibility to allow either or both in your object models, as you see fit. Deferred deletion follows the same process as the update process I just discussed, so let s explore immediate deletion. In this case, a criteria object is created to describe the object to be deleted and the data portal is invoked to do the deletion. Figure 2-21 is a UML diagram that illustrates the process.
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Figure 2-21. UML sequence diagram for immediate deletion of a business object
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Because the data has been deleted at this point, you have nothing to return to the UI, so the overall process remains pretty straightforward. As usual, the client-side DataPortal delegates the call to the server-side data portal. The server-side data portal creates an instance of the business object and invokes its DataPortal_Delete() method, providing the criteria object as a parameter. The business logic to do the deletion itself is encapsulated within the business object, along with all the other business logic relating to the object. Alternatively, the business object could delegate the deletion request to a persistence object in another assembly.
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As discussed earlier in the chapter, many environments include users who aren t part of a Windows domain or AD. In such a case, relying on Windows integrated security for the application is problematic at best, and you re left to implement your own security scheme. Fortunately, the .NET Framework includes several security concepts, along with the ability to customize them to implement your own security as needed. The following discussion applies to you only in the case that Windows integrated security doesn t work for your environment. In such a case, you ll typically maintain a list of users and their roles in a database, or perhaps in an LDAP server. The custom authentication concepts discussed here will help you integrate the application with that preexisting security database.
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The .NET Framework includes a couple of built-in principal and identity objects that support Windows integrated security or generic security. You can also create your own principal and identity objects by creating classes that implement the IPrincipal and IIdentity interfaces from the System. Security.Principal namespace. Implementations of principal and identity objects will be specific to your environment and security requirements. However, CSLA .NET includes a BusinessPrincipalBase class to streamline the process. When you create a custom principal object, it must inherit from BusinessPrincipalBase. Code in the data portal ensures that only a WindowsPrincipal or BusinessPrincipalBase object is passed between client and server, depending on the application s configuration. In many cases, your custom principal object will require very little code. The base class already implements the IPrincipal interface, and it is quite likely that you ll only need to implement the IsInRole() method to fit your needs. However, you will need to implement a custom identity object that implements IIdentity. Typically, this object will populate itself with user profile information and a list of user roles from a database. Essentially, this is just a read-only business object, and so you ll typically inherit from ReadOnlyBase. Such an object might be declared like this: [Serializable] public class CustomIdentity : ReadOnlyBase<CustomIdentity>, IIdentity { // implement here } You ll also need to implement a Login method that the UI code can call to initiate the process of authenticating the user s credentials (username and password) and loading data into the custom identity object. This is often best implemented as a static factory method on the custom principal class. In many cases, this factory method will look something like this:
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