ant - Extract a reference graph while compiling Java codebase? -


background:

  • i'm working (for me) reasonably large codebase (eg: i've got few of related projects checked out @ moment, , > 11000 classes).
  • build ant, tests junit, ci jenkins.
  • running tests before checkin not option, takes jenkins hours. of individual apps can 45 minutes.
  • there tests don't reference individual methods based on reflection, , in cases don't directly reference class of tested methods, interrogate aggregator class, , aware of patterns of pass-through methods in use here. it's big codebase, > 10 developers, , i'm not in charge, this can not change now.

what want, ability before check-in print out list of test classes 2 degrees away (kevin-bacon-wise) class in git diff list. way can run them , cut down on angry emails jenkins when missed gets run , has error.

the easiest way can think of achieve code myself ruby script or similar, allows me account of patterns we're using, need able query "which classes reference class x?"

i parse .java or (easier) .class files info, i'd rather not :) there way can make javac export in simple format compiles?

is there way can make javac export in simple format compiles?

afaik, no.

however, there other ways list of dependencies:

(note unlikely static tool extract dependencies resulting class.forname(), etcetera. note cannot infer complete set of dependencies bytecode files because of way "compile time constants" handled.)

it strikes me there few problems here:

  • it sounds me build, , indeed project structure monolithic. if restructure code base large-scale modules build separately (according dependencies), , version controlled separately, need full build , run unit tests when there change high ... in module else depends on. (can suggest "maven" word. helps large codebase, , 11,000 classes large.)

  • it sounds may suffering "branches hard" problem of classic vcs systems.

  • it sounds may need beefier ci system. if you've got more cores , build framework right, should able faster ci builds. (and if modularize rebuild less ...)

i think might easier address slow build/test cycle way rather via (possibly bespoke) tooling dependency analysis.

but recognize may not make decisions.


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