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Articles : Continuous Integration: The Cornerstone of a Great Shop
on 2007/10/2 22:35:42 (2726 reads)
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Figure 1. Continuous integration actions


As we move forward, keep an open mind and try to see where each step could’ve helped you in the last few months. Then, when we’re done, I’m going to point you to a Continuous Integration system that is trivial to install, easy to use, and open source to boot.

Let's look at what a continuous integration system is and why it helps so much.

The Steps of CI

Continuous integration systems all have a few common steps.

First, CI systems monitor your source code. The system usually watches your source code management system (CVS, Subversion, Perforce, ClearCase, Visual Source Safe, etc) but most systems can also monitor other resources, like file systems. This is how the software knows it's time for a build. Every time your code changes, the CI system checks out the latest version of your code.

Second, the software compiles your project. The system runs your existing build scripts by wrapping them in an Ant script. In this step, your CI software is requiring you to have a scripted build. If you builds are not robust or repeatable, your CI tool will expose this flaw. It will force you to have a clean build system.

Third, CI systems tests yours new build. The tests are created (or wrapped) in an Xunit framework (Junit, Nunit, HtmlUnit, jsUnit, etc), which means you have access to dozens of test frameworks that range from unit testing to browser click through testing. When you set up a system to run tests, people are more likely to write the tests. They'll also contribute the tests they've been hiding on their own machines.

Lastly, your CI system will notify everyone of the results. The developers or testers who just changed the code will get email telling them how long the build and test took, how many tests passed, how many failed, etc. Your system will also archive the results to a web page.

However, the publishing step is very configurable. You can publish in a variety of interesting ways beyond a standard web page. You can publish to a custom web page, XML log, email, an instant messaging client, or even a Lava Lamp. The publish step is an extremely flexible way of sharing your build results.

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