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You should only pursue reuse if you can avoid coupling.
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Designing objects for specific use cases might eliminate some reuse, but it also helps minimize coupling, and thus it helps reduce the cost of development by increasing maintainability. Please note, however, that I am not suggesting that reuse itself is bad. All I m saying is that you can t blindly pursue reuse. Instead, you should reuse code whenever you can do so without causing tight coupling. It is important to realize that you can t have reuse without coupling, so it isn t like you can avoid coupling. All you can do is control the coupling.
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Normalization of Behavior
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One powerful technique you can use to achieve reuse and control coupling is normalization of behavior. The idea is to move the code to be reused into its own object, so objects that contain reusable code are somewhat isolated from most other objects. Figure 3-2 illustrates how you can use normalization of behavior to accomplish the same result as Figure 3-1, but with controlled coupling.
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CH APT ER 3 O BJECT -O RIEN TED A PPLI CA TI O N D ESI GN
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Figure 3-2. Common behavior normalized into object C In this case, the behavior originally contained in object B that is needed by object A is moved to a new object called C. Object C only contains the common behavior required by both objects B and A, and both A and B collaborate with C to use that behavior. This requires more work than simply having A call B, but it is better, because it avoids having A depend on B. Instead, the dependency is shifted so both A and B are dependent upon C. More work is required, because some refactoring of B is required to achieve this result. This is a better solution because C is highly focused, in that it only contains the code common to both A and B. While coupling still exists, the coupling is clearer and more easily managed. Object-oriented design works best when objects are designed for a specific use case and when each object has a single responsibility within that use case. To achieve reuse, utilize normalization of behavior by refactoring common code into its own object and have other objects collaborate with this new object to leverage the behavior. Given this brief conceptual background, I ll put the ideas into practice by walking through the design of a reference application called Project Tracker.
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There are many ways to gather application requirements, but in general, you can choose from these three main areas of focus: Data analysis and data flow UI design and storyboarding Business concept and process analysis The first option is the oldest of the three. It s the idea that an application can be designed by understanding the data it requires and how that data must flow through the system. While this approach can work, it isn t ideal when trying to work with object-oriented concepts, because it focuses less on business ideas and more on raw data. It s often a good analysis approach when building applications that follow a data-centric architecture.
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The data-focused analysis approach often makes it hard to relate to users well. Few users understand database diagrams and database concepts, so there s a constant struggle as the business language and concepts are translated into and out of relational, data-oriented language and concepts.
The idea of basing application analysis around the UI came into vogue in the early-to-mid 1990s with the rise of rapid application development (RAD) tools such as Visual Basic, PowerBuilder, and
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Delphi. It was subsequently picked up by the web development world, though in that environment the term storyboarding was often used to describe the process. UI-focused analysis has the benefit of being accessible to end users, who find it easy to relate to the UI and how it flows. The drawback to this approach is that there s a tendency for business validation and processing to end up being written directly into the UI. This doesn t always happen, but it s a very real problem primarily because UI-focused analysis frequently revolves around a UI prototype, which includes more and more business logic as the process progresses, until developers decide just to use the prototype as the base for the application, since so much work has been done already.
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