By Rebecca Wirfs-Brock
ISBN-10: 0201379430
ISBN-13: 9780201379433
Wirfs-Brock and her co-worker McKean define a suite of software program improvement practices she devised to layout items with particular roles, often called responsibility-driven layout. Her procedure includes settling on candidate items for the layout version, defining the tasks of an item, and designating the keep an eye on facilities of an software. Later chapters within the ebook discover techniques for documenting a layout, current recommendations for dealing with exceptions and improving from error, and speak about how one can symbolize software program adaptations.
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Additional resources for Object Design: Roles, Responsibilities, and Collaborations
Example text
An architecture is a collection of behaviors and a set of descriptions about how they impact one another. Box-and-line drawings describe only the structure. They completely ignore the behavior. A revealing architecture demonstrates the assumptions that each subsystem or component in the application can make about its neighbors, whether it be their responsibilities, error-handling abilities, shared resource usage, or performance characteristics. Because there are many objects in an application, we need different ways of viewing its parts that hide most of their details.
Each layer contains characteristic object roles. 35 36 Communication between objects tends to follow these rules: • Objects collaborate mostly within their layer. • When they do reside in different layers, client objects are usually above server objects. The messages (requests) flow mostly down. • Information (results) flows mostly up. • When messages flow up, client objects are in lower layers, and they are loosely coupled to their server objects. This usually uses an event mechanism. • Only the topmost and bottommost layers are exposed to the "outside" world.
We start by declaring that any object playing a Command role has a responsibility for performing a specific action (see Figure 2-10). Undoubtedly, our design will need to have many different kinds of Command objects, and classes that implement them, to model each of the myriad actions our word processor takes. To support "undoing" of each action, each different kind of Command object will be responsible for reversing its action. We will define the responsibilities for each different kind of command.
Object Design: Roles, Responsibilities, and Collaborations by Rebecca Wirfs-Brock
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