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A UI framework often uses these status values to enable or disable various UI elements to give the user cues about what actions are possible at any point in time. As you ll see in 10, the CslaDataProvider automatically handles these details in a WPF interface.

In this chapter, we gave you an overview of the Table service, explaining how it provides massively scalable storage and how it differs from traditional relational databases, such as SQL Server. As you ve seen, the Table service is a scalable way of storing and querying entities, and it isn t a relational database. We can sometimes assume we need relational databases when there are other ways of representing data in our solution. Designing systems is all about trade-offs, and the trade-off with relational databases is scalability. By using the Table service, you gain scalability, but the cost is that you have to think and design systems in a different way. You now have enough knowledge to create and deploy web applications that run in the cloud and can store data in the Table service. In the next chapter, we ll expand upon your new knowledge and drill into some of the inner workings of the service by looking at the REST API and seeing how you can efficiently query and update data.

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As discussed earlier, the FieldInfo array could include fields from the base classes of the current class. Due to the way the Just-in-Time (JIT) compiler optimizes code within the same assembly, if some base classes are in the same assembly as the actual business class, the same field name may

Your services won t always be running on the same machine, and they might be failed over to another machine at any time. Failover might be caused by hardware failures, software maintenance cycles, or load distribution. You must design your software so that it can handle these failures. This might mean automatically retrying a failed operation when an exception occurs or reloading any local caches when a service restarts. We ll delve further into these issues in chapter 18. Let s switch gears now and look at what the Windows Azure platform is all about.

In the same way that IBusinessObject provides a form of polymorphism and commonality across all business objects, IUndoableObject does the same thing for any object that supports n-level undo. This includes those that inherit from BusinessBase<T> and BusinessListBase<T,C>, among others. This polymorphic ability is of critical importance in the implementation of UndoableBase, as discussed in 13. UndoableBase needs to be able to treat all editable objects the same in order to implement the n-level undo functionality. Here s the code for IUndoableObject: public interface IUndoableObject { int EditLevel { get; } void CopyState(int parentEditLevel, bool parentBindingEdit); void UndoChanges(int parentEditLevel, bool parentBindingEdit); void AcceptChanges(int parentEditLevel, bool parentBindingEdit); } The n-level undo support implemented by UndoableBase requires that every object implements the property and three methods listed in this interface. Putting these methods in an interface is a double-edged sword. On one hand it clearly defines the methods and will make it easier to implement UndoableBase. On the other hand, these methods are now potentially available to any code using a business object. In other words, a UI developer

be listed in multiple classes! As the code walks up the inheritance hierarchy, it could end up processing those fields twice. To avoid this, the code only looks at the fields that directly belong to the class currently being processed: foreach(FieldInfo field in fields) { // make sure we process only our variables if(field.DeclaringType == currentType)

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