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Re: [aspectj-users] quick little hack
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That is very cool!
Heh, if only exceptions wasn't that expensieve to create in java.
Thought it mat get fixed in Java 7 if they decide to implement one of
those closures specs.
Wile Java 7 is still fat on a horizon, we could reuse exception
instance per trampoline, per thread (i.e. storing it in ThreadLocal).
regards,
Eugene
Gregor Kiczales wrote:
Here's a quick little hack that Ryan Golbeck and I just wrote...
(the complete code w/ example is attached in three files)
/*
* The idea here is to take a program with a dispersed iterative structure,
and
* given the 'nonReturningCalls' (procedure calls that never return until
the
* very end of the computation) package them up in a closure and bounce them
* off a trampoline farther up the stack.
*
* Try commenting out this aspect and then running A.main(). That will
produce a
* stack overflow. Enable the aspect ---> No overflow, just nice iteration!
*
*
*/
public aspect Trampolining {
pointcut trampoline(): execution(void A.main(String[]));
pointcut nonReturningCalls(): call(void A.a(B))
|| call(void B.b(A));
void around(): trampoline() {
Closure proceeder = new Closure(){
public void doit() { proceed(); }
};
while (true) {
try { proceeder.doit(); }
catch(ToBounce e) { proceeder = e.getClosure(); }
}
}
void around(): nonReturningCalls() {
throw new ToBounce(new Closure(){
public void doit() { proceed(); }
});
}
}
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