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When creating object-oriented applications, the ideal situation is that any nonbusiness objects already exist. This includes UI controls, data access objects, and so forth. In that case, all developers need to do is focus on creating, debugging, and testing the business objects themselves, thereby ensuring that each one encapsulates the data and business logic needed to make the application work. As rich as the .NET Framework is, however, it doesn t provide all the nonbusiness objects needed in order to create most applications. All the basic tools are there but there s a fair amount of work to be done before you can just sit down and write business logic. There s a set of higher-level functions and capabilities that are often needed but aren t provided by .NET right out of the box. These include the following: Validation and maintaining a list of broken business rules Standard implementation of business and validation rules Tracking whether an object s data has changed (is it dirty ) Integrated authorization rules at the object and property levels
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C HAPTE R 2 FRA MEWORK DES IGN
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Strongly typed collections of child objects (parent-child relationships) N-level undo capability A simple and abstract model for the UI developer Full support for data binding in WPF, Windows Forms, and Web Forms Saving objects to a database and getting them back again Custom authentication Other miscellaneous features In all of these cases, the .NET Framework provides all the pieces of the puzzle, but they must be put together to match your specialized requirements. What you don t want to do, however, is to have to put them together for every business object or application. The goal is to put them together once so that all these extra features are automatically available to all the business objects and applications. Moreover, because the goal is to enable the implementation of object-oriented business systems, the core object-oriented concepts must also be preserved: Abstraction Encapsulation Polymorphism Inheritance The result is a framework consisting of a number of classes. The design of these classes is discussed in this chapter and their implementation is discussed in s 6 through 16.
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Tip
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The Diagrams folder in the Csla project in the code download includes FullCsla.cd, which shows all the framework classes in a single diagram. You can also get a PDF document showing that diagram at www.lhotka.net/cslanet/download.aspx.
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Before getting into the details of the framework s design, let s discuss the desired set of features in more detail.
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Validation and Business Rules
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A lot of business logic involves the enforcement of validation rules. The fact that a given piece of data is required is a validation rule. The fact that one date must be later than another date is a validation rule. Some validation rules involve calculations and others are merely toggles. You can think about validation rules as being either broken or not. And when one or more rules are broken the object is invalid. A similar concept is the idea of business rules that might alter the state of the object. The fact that a given piece of text data must be all uppercase is a business rule. The calculation of one property value based on other property values is a business rule. Most business rules involve some level of calculation. Because all validation rules ultimately return a Boolean value, it is possible to abstract the concept of validation rules to a large degree. Every rule is implemented as a bit of code. Some of the code might be trivial, such as comparing the length of a string and returning false if the value is zero. Other code might be more complex, involving validation of the data against a lookup table or through a numeric algorithm. Either way, a validation rule can be expressed as a method that returns a Boolean result.
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