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The class diagrams created so far have focused entirely on the business domain which is a good thing. Ideally, you should always start by focusing on business issues and deferring much of the technical design to a later stage in the process. Users typically don t understand (or care about) the technical issues behind the scenes, such as how you are going to implement the Cancel buttons or how to retrieve data from the database. Of course, the business developer cares about these issues but these issues can be dealt with after the basic object modeling is complete, once you have a good understanding of the business issues and confidence that your model can meet the requirements laid out in the use cases. Going forward in this book, I ll be assuming the use of the CSLA .NET framework described in 2. Using this framework (or any comparable framework) means spending less time figuring out how to design or implement the features included in the framework. By relying on CSLA .NET, developers gain the benefits listed in Table 3-4.
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Table 3-4. Benefits Gained by Using CSLA .NET
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Feature
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Smart data
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Description
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Business data is encapsulated in objects along with its associated business logic, so developers are never working with raw, unprotected data, and all business logic is centralized for easy maintenance. Developers use standard .NET object-oriented programming techniques to create business objects. Data access runs locally or on an application server, without changing business code. Clearly defined methods contain all data access code. Objects only persist themselves if their data has been changed. It s easy to select between various transaction technologies to balance between performance and features. Support for complex WPF or Windows Forms interfaces is easy, while also supporting high-performance web interfaces. This reduces the code required to implement business and validation rules. This reduces the code required to implement per-property authorization. With full support for WPF, Windows Forms, and Web Forms data binding, minimal code is required to create sophisticated user interfaces (see s 19 and 20).
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Easy object creation Flexible physical configuration Object persistence Optimized data access
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Business rule management Authorization rule management Simple UI creation
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CH APT ER 3 O BJECT -O RIEN TED A PPLI CA TI O N D ESI GN
Table 3-4. Benefits Gained by Using CSLA .NET (Continued)
Feature
Web service support
Description
Developers can readily create a web service interface for the application, so that other applications can tap into the application s functionality directly (see 21). This makes it easy to select between Windows integrated security and CSLA .NET custom security. It s also easy to customize CSLA .NET custom security to use preexisting security databases. In either case, standard .NET security objects are used, providing a standard way to access user security information.
Custom authentication
To use CSLA .NET, developers merely need to determine which base classes to inherit from when creating each business class. For example, some business objects will be editable objects that can be loaded directly by the user. These need to inherit from BusinessBase, as shown in Figure 3-13.
Figure 3-13. Business objects subclassing BusinessBase By subclassing BusinessBase, all of these objects gain the full set of business object capabilities implemented in s 6 through 16. The model also includes objects that are collections of business objects, and they should inherit from BusinessListBase, as shown in Figure 3-14. BusinessListBase supports the undo capabilities implemented for BusinessBase; the two base classes work hand in hand to provide this functionality. As shown in Figure 3-15, the two objects that list read-only data for the user inherit from ReadOnlyListBase. This base class provides the support objects need for retrieving data from the database without the overhead of supporting undo or business rule tracking. Those features aren t required for read-only objects. The ProjectInfo and ResourceInfo classes don t inherit from any CSLA .NET base classes. As you ll see in s 17 and 18, they must be marked with the Serializable attribute, but they don t need to inherit from a special base class just to expose a set of read-only properties.
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