I'm sharing this as I think it could be useful to others.
I like to build the java/sca tree before committing code changes to
check that my changes are not going to break any other module.
This gives me a peace of mind as I don't have to worry about build
breaks and is also nice to other contributors as I know that I'm not
breaking their modules.
Unfortunately Maven is not particularly smart about detecting changes
and rebuilding only impacted modules and the brute force "mvn clean
install" on the whole tree takes long and makes my Thinkpad's CPU overheat.
So I thought it would be nice to teach Maven how to do more incremental
builds:
- recompile and retest with mvn clean install the modules that have
compile dependencies on the modules I've changed
- only retest the modules that have runtime and test dependencies on the
modules I've changed.
I developed a little Maven plugin to do it. It's really simple and
leverages the Maven dependency model, see for yourself at [1].
Here's how I use the plugin to run incremental builds:
1. To mark that a module has changed, create a .modified marker file at
its root. This is what the plugin recognizes as an indication that the
module has changed. I was thinking about running "svn st" automatically
from the plugin but for now I've found simpler to just use a shell
script like follows to create/remove these .modified marker files:
st=`svn st | grep -v ".modified"`
if [ "x$st" != "x" ]
then
echo "Modified"
echo "$st"
touch .modified
else
echo "Not modified"
rm -f .modified
fi
This is for Linux, I'm sure that it can be translated to a Windows script.
2. To run the incremental build, from java/sca run:
mvn -o org.apache.tuscany.sca:tuscany-maven-incremental-build:build
This will recompile and/or retest only the modules affected by the
changed modules. Faster and more reliable, and greener as my Thinkpad
now uses less energy :)
Hope this helps. I'm interested in your feedback if you use it and like
it, or not :) or want to help improve it.
[1]
https://svn.apache.org/repos/asf/incubator/tuscany/java/sca/tools/maven/maven-incremental-build/src/main/java/org/apache/tuscany/sca/tools/incremental/build/plugin/IncrementalBuildMojo.java
--
Jean-Sebastien
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