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Feature 2
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F29xx11
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Figure 29-11 In feature-oriented integration, you integrate classes in groups that make up identifiable features usually, but not always, multiple classes at a time.
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Components are added in feature trees, hierarchical collections of classes that make up a feature. Integration is easier if each feature is relatively independent, perhaps calling the same low-level library code as the classes for other features, but having no calls to middle-level code in common with other features. (The shared, low-level library classes aren t shown in the illustration above.) Feature-oriented integration offers three main advantages. First, it eliminates scaffolding for virtually everything except low-level library classes. The skeleton might need a little scaffolding, or some parts of the skeleton might simply not be operational until particular features have been added. When each feature has been hung on the structure, however, no additional scaffolding is needed. Since each feature is self-contained, each feature contains all the support code it needs. The second main advantage is that each newly integrated feature brings about an incremental addition in functionality. This provides evidence that the project is moving steadily forward. A third advantage is that feature-oriented integration works well with objectoriented design. Objects tend to map well to features, which makes featureoriented integration a natural choice for object-oriented systems. Pure feature-oriented integration is as difficult to pursue as pure top-down or bottom-up integration. Usually some of the low-level code must be integrated before certain significant features can be.
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de Complete
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29. Integration
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Page 15
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T-Shaped Integration
A final approach that often addresses the problems associated with top-down and bottom-up integration is called T-Shaped Integration. In this approach, one specific vertical slice is selected for early development and integration. That slices should exercise the system end-to-end, and should be capable of flushing out any major problems in the system s design assumptions. Once that vertical slice has been implemented (and any associated problems have been corrected), then the overall breadth of the system can be developed such as the menu system in a desktop application. This approach is often combined with riskoriented or feature-oriented integration.
S tart Finish
Finish
F29xx12
Figure 29-12 In T-Shaped integration, you build and integrate a deep slice of the system to verify architectural assumptions, then you build and integrate the breadth of the system to provide a framework for developing the remaining functionality.
Summary of Integration Approaches
Bottom-up, top-down, sandwich, risk-oriented, feature-oriented, T-shape do you get the feeling that people are making these names up as they go along They are. None of these approaches are robust procedures that you should follow methodically from step 1 to step 47 and then declare yourself to be done. Like software-design approaches, they are heuristics more than algorithms, and rather than following any procedure dogmatically, you come out ahead by making up a unique strategy tailored to your specific project.
de Complete
29. Integration
Page 16
29.4 Daily Build and Smoke Test
of this discussion is adapted from 18 of Rapid Development (McConnell 1996). If you ve read that discussion, you might skip ahead to the Continuous Integration section.
2 FURTHER READING Much
Whatever integration strategy you select, a good approach to integrating the software is the daily build and smoke test. Every file is compiled, linked, and combined into an executable program every day, and the program is then put through a smoke test, a relatively simple check to see whether the product smokes when it runs. This simple process produces several significant benefits. It reduces the risk of low quality. Related to the risk of unsuccessful or problematic integration is the risk of low quality. By minimally smoke-testing all the code daily, quality problems are prevented from taking control of the project. You bring the system to a known, good state, and then you keep it there. You simply don t allow it to deteriorate to the point where time-consuming quality problems can occur. It supports easier defect diagnosis. When the product is built and tested every day, it s easy to pinpoint why the product is broken on any given day. If the product worked on Day 17 and is broken on Day 18, something that happened between the two builds broke the product. It improves morale. Seeing a product work provides an incredible boost to morale. It almost doesn t matter what the product does. Developers can be excited just to see it display a rectangle! With daily builds, a bit more of the product works every day, and that keeps morale high. One side effect of frequent integration is that it surfaces work that can otherwise accumulate unseen until it appears unexpectedly at the end of the project. That accumulation of unsurfaced work can turn into an end-of-project tar pit that takes weeks or months to wrestle out of. Teams that haven t used the daily build process previously sometimes feel that daily builds slow their progress to a snail s crawl. What s really happening is that daily builds amortize work more steadily throughout the project, and the project team is just getting a more accurate picture of how fast it s been working all along. Here are some of the ins and outs of using daily builds.
Build daily The most fundamental part of the daily build is the daily part. As Jim McCarthy says, treat the daily build as the heartbeat of the project (McCarthy 1995). If there s no heartbeat, the project is dead. A little less metaphorically, Michael Cusumano and Richard W. Selby describe the daily build as the sync pulse of a project (Cusumano and Selby 1995). Different developers code is
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