Make a web site - The distclean target reverts the project back to
The distclean target reverts the project back to its pristine “distribution” state. That is, all build products class files and the WAR file are removed, so the project directory looks the same as it did when the project directory tree was first installed. Note that the distclean target calls the cleantarget. While this isn’t really necessary for this small project, it demonstrates more of the power of Ant by invoking another target via the antcall task. The antcall task can even call a target with arguments, but that is beyond the scope of this book. There are various plug-ins that you can download that allow you to use Ant inside of your specific IDE. For example, the AntRunner plug-in allows Ant to be used within the JBuilder IDE. For this and other plug-ins, see the external tools section of the Ant site at http://jakarta.apache.org/ant/external.html. 16.5 Creating an Automated Build Environment Once you have put together a satisfactory build environment, you should go the extra step to automate it. This means that no human interaction is needed to execute new builds. It’s very common for build frequencies to increase the closer you get to the end of a construction phase. You can, of course, just manually kick off builds when you need them, but a better and much more efficient approach is to use a scheduling mechanism to invoke your Ant build environment. There are at least two scheduling mechanisms that you can employ, depending on your environment. In Unix, you can use the cron daemon, and on the Windows platform, you can take advantage of the Task Scheduler. 16.5.1 Using cron to Invoke Ant cron is a program that allows you to automate tasks by running user-defined programs at regular intervals. cron allows you to define both the program that is to be run and the exact time at which to run it. The cron program is a daemon program, which means that it runs in the background until it’s needed. It wakes up every minute, checks to see if there are any scheduled tasks that need to be performed, and, after it runs the tasks, goes back to waiting. The list of tasks for cron to execute comes from a file called a cron table, which is commonly referred to as crontabs. The crontabs is a schedule that lists the tasks to run and the date and time to run them. Some system administrators may disable cron from running on a server in order to save processing power. In this case, you’ll need to get permission to run cronprograms. You can verify that cron is running and that you have permission to access it by typing crontab-l at the command prompt. All you need to do is edit crontabs and add an entry that calls your ant program, which in turn will kick off the build. Check the Unix manpages for more information on using cron.
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