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Introducing Continuous Integration as a Way to Improve Software Quality and Reduce Risk

Aug 17, 2007

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Continuous Integration: Improving Software Quality and Reducing Risk

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Commit Code Frequently

One of the central tenets of CI is integrating early and often. Developers must commit code frequently in order to realize the benefits of CI. Waiting more than a day or so to commit code to the version control repository makes integration time-consuming and may prevent developers from being able to use the latest changes. Try one or both of these techniques to commit code more frequently.

Make small changes—Try not to change many components all at once. Instead, choose a small task, write the tests and source code, run your tests, and then commit your code to the version control repository.
Commit after each task—Assuming tasks/work items have been broken up so that they can be finished in a few hours, some development shops require developers to commit their code as they complete each task.

Try to avoid having everyone commit at the same time every day. You'll find that there are usually many more build errors to manage because of the collisions between changes. This is especially troublesome at the end of the day, when people are ready to leave. The longer you wait to integrate with others, the more difficult your integration will prove to be.

I Just Can't Commit

A friend runs a 25-developer project and he'd like to incorporate many CI practices, but he is experiencing challenges in getting the developers to commit code frequently. I've found that the main reason that changes are not committed frequently is because of the project culture. Sometimes developers do not want to commit their code until it is "perfect." This usually happens because their changes affect too many components. Committing code frequently to the version control repository is the only effective way to implement CI, and this means that all developers need to embrace this development practice by grabbing smaller chunks of code and breaking up their tasks into smaller work items.

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