There are certain aspects that are ripe for reuse. There are various levels of reuse of course (totally generic: Log4J, company-reuse: YourCompanyLogger, etc).
A common pattern that you run into, (we use it in aTrack. Ramnivas has it in his book, etc) is that you want to apply some advice, but only to a subset of your code.
The simple way to do this is to use the template pattern:
First, define the abstract aspect which does most of the work, but leave open a scope() pointcut:
public abstract aspect PolicyEnforcement {
abstract pointcut scope();pointcut printing():
get(* System.out) || get(* System.err) ||
call(* printStackTrace());declare error: scope() && printing():
”Our policy enforces the fact that you have to print via our logger”;declare warning:
call(Exception.new()) ||
call(RuntimeException.new()) &&
scope():
”constructing exception without
