It took me quite some time to replace the Clean Code Developer bracelet; it took me way more time than the usual three weeks because 1) the principles are fundamental and 2) I didn’t have much opportunity to use them all. But, now, I think it’s definitely time to switch from the yellow to the green bracelet. The principles and practices of the green bracelet are:
- Open closed principle: open for extension, closed for change (Object-Oriented Software Construction by Bertrand Meyer)
- Tell don’t ask
- Law of Demeter: Personally, I don’t think this principle can be used steadily nowadays. If you work with frameworks, you seldom have a chance to follow this principle striclty.
- Continuous Integration: I recommend the article of Martin Fowler for a very good introduction and the Podcast fom se-radio.net For our project, we use Hudson as the continuous integration server.
- Static code analysis
- Inversion of Control Container
- Pass knowledge
- Measure bugs
Today I gave a seminar on software testing for PhD students and professionals at the University of Zurich. During the seminar, I used the uDoo demo application to show how to use Maven and Hudson for automated testing.
The continuous integration server Hudson knows several ways to trigger a build. If you’d like Hudson to build your project when the source-base changes and you don’t want to let him poll your Subversion periodically let Subversion trigger the build upon commit. To do that, first, configure your job in Hudson (Job -> Configure -> Build Triggers) with “Trigger builds remotely (e.g., from scripts)” (”uDoo” is the job name, so replace it with your job name):
Second, configure a post-commit hook in your Subversion repository: In the repository directory of your Subversion-server, a directory hook exists. In this directory you may already have a file post-commit with 744 permissions. If not, a file post-commit.tmpl exists. In that case, copy the file and change the permissions:
$ cd path/to/your/repository/hook
$ cp post-commit.tmpl post-commit
$ chmod 744 post-commit
To trigger the build via Subversion, just put the following line at the end of the post-commit file.
wget -b http://HUDSON_URL/job/JOB_NAME/build?token=my_automated_build > /dev/null
That’s it.
