Re: smart reactor proposal

[Brian Ewins]

There are a lot more sources in a project than just its java source. For 
example, any project with snapshot dependencies may change if its 
snapshot jars have changed. You won't know this without actually doing a 
build.

Secondly, the reactor takes a list of goals. One of those goals - or 
indeed an invocation from a custom goal - could be 'clean'. (maven-new's 
maven.xml contains an example of this)

Thirdly, you need to keep track not only of whether the project changed, 
but whether the  build environment changed. What you describe won't 
notice if I change MAVEN_HOME, maven.repo.local, JAVA_HOME, the -o flag, 
etc etc. Admittedly neither will javac, of course.

In short: the idea is of dubious value. Individual goals (like 
java:compile) can make better decisions about what to do and what not to 
do because they are much more focussed, but shortcutting builds at the 
reactor level is error prone.

Having said all that, if this was an optional feature, or a different 
goal, I'd be happy with it.

-Baz

Aslak Hellesøy wrote:
Sorry if this has been brought up before, but I have an idea about how 
to make the reactor smarter/quicker.

I have a project with lots of subprojects that are built with reactor. I>
 want to reduce the build time by making the reactor smarter.
Imagine I have 3 sub projects a,b and c with the following dependencies:>
 a<-b<-c.
The 1st time I run reactor everything is built. Then I modify b and run>
 reactor again. a doesn't depend on b and therefore shouldn't be rebuilt.>
 The reactor should now only build b and c.
I think this can be implemented quite simply by doing some date 
comparisons between java sources and classes in each project.

I'm planning to implement this feature, but before I do, I'd like to 
hear some opinions.

Cheers,
Aslak
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