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Figure 2-3. Class diagram showing a more complex set of class relationships Now things get even more complicated. If the user edits a Component object, the changes ultimately impact the state of the Invoice object itself. Of course, changing a Component also changes the state of the LineItem object that owns the Component. The user might accept changes to a Component but cancel the changes to its parent LineItem object, thereby forcing an undo operation to reverse accepted changes to the Component. Or in an even more complex scenario, the user may accept the changes to a Component and its parent LineItem only to cancel the Invoice. This would force an undo operation that reverses all those changes to the child objects. Implementing an undo mechanism to support such n-level scenarios isn t trivial. The application must implement code to take a snapshot of the state of each object before it s edited so that changes can be reversed later on. The application might even need to take more than one snapshot of an object s state at different points in the editing process so that the object can revert to the appropriate point, based on when the user chooses to accept or cancel any edits.

PTPrincipal is a custom principal object that can be assigned as the current principal on the Thread object and in the HttpContext. s 9 and 10 will demonstrate how to configure the Thread and HttpContext to use this object in the UI, but first you should understand how the PTPrincipal class is created. Within .NET, the principal object is the centerpiece for authorization. The object must implement System.Security.Principal.IPrincipal, which defines an Identity property and an IsInRole() method. Default implementations are implemented in Csla.Security.BusinessPrincipalBase, and so PTPrincipal inherits from that class: [Serializable()] public class PTPrincipal : Csla.Security.BusinessPrincipalBase Principal objects typically have a constructor that accepts the identity object that represents the user s identity, and PTPrincipal is no exception: private PTPrincipal(IIdentity identity) : base(identity) { } The BusinessPrincipalBase class also has a constructor that requires an identity object. This object is used to implement the Identity property in that base class, so it doesn t need to be implemented in PTPrincipal. The IsInRole() method is a bit more complex, however. To implement this method, the principal object must have the list of roles to which the user belongs. Of course, the identity object actually represents the user s identity and profile, and so it most likely contains the list of roles for the user as

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Now that you have a basic understanding of what you can do with Azure, let s drill deeper into the pieces of Azure and how to best work with them. In this chapter, we ll discuss how Windows Azure is architected and how it does the cloud magic that it does. Understanding this background will help you develop better services, be a better person, and get the most out of your Azure infrastructure.

This multilevel undo capability flows from the user s expectations. Consider a typical word processor, where the user can undo multiple times to restore the content to ever earlier states.

well. Certainly, that is how I choose to implement my custom objects, and so PTIdentity maintains the user s roles. This means that PTPrincipal can simply delegate the call to its identity object: public override bool IsInRole(string role) { PTIdentity identity = (PTIdentity)this.Identity; return identity.IsInRole(role); } The result indicates whether the user is in the specified role or not.

When Azure was first announced at the PDC in 2008, Microsoft wasn t a recognized player in the cloud industry. It was the underdog to the giants Google and Amazon, which had been offering cloud services for years by that time. Building and

The UI will need to collect the user s credentials and initiate any login or logout process. However, the actual login and logout process can be encapsulated within PTPrincipal to help simplify the code in the UI. To do this, static methods named Login() and Logout() are implemented in the class. This allows the UI to write code like this: if (PTPrincipal.Login(username, password)) { } and this: PTPrincipal.Logout();

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