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CHAPTER 10 FUNCTIONAL ROLES
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Software systems are used in the most disparate applications, making it difficult to imagine that their internal structures could have much in common. What could the real-time temperature-control system in your kitchen refrigerator have in common with a graphics weather program simulating the development of tornados What could a word-processing program have in common with a creditcard-processing service The answer to both is functional roles. You can envision event-based programs as a collection of parts that communicate using notification signals. These parts are not arbitrary in function: They tend to fall into well-defined categories, depending on their overall role in the system. Whether the parts are components, objects, or modules is not important: They can all be considered black boxes that provide a certain type of service to the surrounding system. By identifying roles explicitly in your designs, you make clear the separation of responsibilities across parts. Workers handle the bulk of the business logic. Coordinators manage workers and threading issues. Builders and binders create and hook the parts together. Routers ensure that signals get to their intended destinations. In the next three chapters, I ll present complete case studies that illustrate real-world applications designed with parts fulfilling the functional roles described in this chapter.
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Case Study 1: A System Browser
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tarting with this chapter, I ll switch gears and look at some complete case studies of event-based systems designed with decoupled parts. If you re like me and enjoy looking at code, you should find these case studies interesting, because they bring together many of the ideas and concepts introduced earlier. The first example is a small desktop system browser, conceptually similar to Microsoft Windows Explorer. The program, called SystemBrowser, consists of only one component and allows users to browse the file system and search for files. The main purpose of the example is to show how you might use decoupled classes to build a program with a user interface. The program demonstrates the following tasks: Using workers and coordinators to build a GUI program Managing the startup and shutdown phases using LifecycleCoordinators Saving and retrieving persistent user settings Updating a splash screen during initialization Using a coordinator to manage multithreading Unit-testing workers with dedicated test fixtures While you can develop all the system s design and concepts in any programming language that supports events, the implementation details will vary somewhat across operating systems and component platforms. I ll provide the complete source code in both C# and VB .NET.
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The program needs to support a two pane-window with a navigation pane on the left side and a content pane on the right. The navigation pane must have two different navigator controls: a Folders navigator and a Search navigator. Only one must be visible at a time. The Folders navigator shows a hierarchical list of folders on the C: drive. The Search navigator contains controls to search for files. The right pane must display information related to the selection in the left pane. Figure 11-1 shows what the program should look like when the Folders navigator is selected.
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CHAPTER 11 CASE STUDY 1: A SYSTEM BROWSER
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Figure 11-1. A screenshot of SystemBrowser with the Folders navigator selected The navigator and content panes must be mutually synchronized, in the sense that selecting an item in one updates the other. When you select a folder in the Folders navigator, the content pane must show the folders and files in the selected folder. The status bar must display the complete path of the folder. When you select a file in the content pane, the status bar must show the file s size and its complete file path. Double-clicking a folder in the content pane should make two things happen: The Folders navigator should select the folder, and the content pane should show the contents of the folder. The other navigator is a Search control that allows you to recursively search all subdirectories of a given directory for a file. SystemBrowser supports regular expressions for filenames, so you can do a search with names like m .exe or *.doc. You must be able to interrupt the search at any time by clicking a button. While the search runs, the status bar must show the number of files found. The content pane must display a list of the files found. Selecting a file in the content pane must make the file s size and path appear in the status bar. Figure 11-2 shows the system after running a search.
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