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The one thing you should ve noticed is how little difference there is, code-wise, between what you would normally write for a website and what you write for Windows Azure. The web application you built has nothing special about it, and it ll run on a normal on-premises server. Azure is just another place to run your code, much more dynamic than any data center you ve ever worked with, but the same. Our sample was simple and didn t delve into the more advanced scenarios, but the point is still valid. The strength of Azure, for a developer, is how not different it is from what you do every day. Deployment is almost a trivial matter. It doesn t take a lot of effort to create a service, upload the package, and promote it to production. The simple staging and production environments make it easy to roll back to the old code in case the new deployment goes horribly wrong. We ll look into what s under the covers in the next chapter, and see what Microsoft had to do to build such a powerful platform, yet keep it simple.

Of course, the code in DataPortal_Execute() could be as complex as you require. It might create and interact with business objects on the server; or it might use server-side resources such as the file system, a high-powered CPU or specialized third-party hardware, or software installed on the server. In this case, the code works directly against the database to execute the existsProject stored procedure to determine if the data exists in the database: int count = (int)cm.ExecuteScalar(); _exists = (count > 0); Really, the data portal does most of the hard work with command objects. When DataPortal. Execute() is called on the client, the command object is copied to the server and its DataPortal_ Execute() method is invoked. Once that method completes, the data portal copies the object back to the client, thus allowing the client to get any information out of the command object. The Exists() command in the Resource class is implemented in the same manner. At this point, you should understand how all the business objects in ProjectTracker.Library are implemented. The only classes yet to be discussed are the ones supporting custom authentication.

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Figure 2-2. Relationship between the Invoice, LineItems, and LineItem classes The UI may allow the user to edit the LineItem objects and then press Enter to accept the changes to the item or Esc to undo them. However, even if the user chooses to accept changes to some LineItem objects, she can still choose to cancel the changes on the Invoice itself. Of course, the only way to reset the Invoice object to its original state is to restore the states of the LineItem objects as well, including any changes to specific LineItem objects that might have been accepted earlier. As if this isn t enough, many applications have more complex hierarchies of objects and subobjects (which I ll call child objects). Perhaps the individual LineItem objects each has a collection of Component objects beneath it. Each Component object represents one of the components sold to the customer that makes up the specific line item, as shown in Figure 2-3.

ith the cloud basics and Windows Azure concepts under your belt, we dial it up a notch. In part 2, we look at all the parts of the service model. 3 explains what the service model is, how Azure uses it, and how Azure works behind the scenes. A brilliant chapter if there ever was one. The quality only gets better as we move into chapter 4, which discusses how to reference the Azure APIs in your code and how to exploit the service runtime. In chapter 5, we trot out how to configure your service model using the configuration files and the portal. An exciting chapter, especially if you like XML and angle braces.

Applications may use either Windows integrated (AD) or custom authentication. Using Windows integrated security requires no extra coding in the business layer, and the only code required in the UI is to tell .NET to use Windows authentication, by calling AppDomain.CurrentDomain.SetPrincipalPolicy() in Windows Forms, or in the web.config file for Web Forms or Web Services. Custom authentication requires some extra code in the business layer, however, because custom principal and identity classes must be created. The details of the design were discussed in 6, so I ll focus on the implementation here.

How Microsoft built Azure What a cloud operating system is How your application is provisioned and managed in the cloud

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