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Re: [aspectj-users] Guidaance on Cflow usage
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Donal,
You need to use cflowbelow() pointcut to exclude the join point
itself.
There is a sample chapter (chapter 3) from my book posted that
covers control-flow based pointcuts:
http://www.manning.com/laddad/
-Ramnivas
--- Donal Lafferty <laffertd@xxxxxxxxx> wrote:
> Hi!
>
> I'm having trouble coming to grasps with cflow pointcuts. In the
> example below, I was surprised to find out that cflow advice is
> included
> in the set of cflow join points, which leads to an infinite
> recursion.
> Although I'm tempted to submit this as a bug, I'm not wholly
> convinced I
> understand what I'm doing. Moreover, the bug submission system is
> down.
>
> Any comments on the problem are more than welcome!
>
> Cheers,
>
>
> DL
>
>
> WordCounterDemo.java
>
> class WordCounterDemo
> {
> static String[] smallSample= {"This", "demos", "infinite", "loop",
> "in",
> "cflow", "before", "advice"};
>
> public static void main(String[] args) {
> WordCounter wordCounter = new WordCounter();
> String word;
> String[] wordList1 = smallSample;
> int words = 0;
> for (int i = 0; i < wordList1.length; i++) {
> word = smallSample[i];
> System.out.println("Adding " + word +", as word #" +
> (++words));
> wordCounter.Add(word);
> }
> }
> }
>
> WordCounter.java
>
> public class WordCounter {
> public void Add(String word) {
> System.out.println("Add entry, word = "+word.toString());
> }
> }
>
> Cflow.aj
>
> public aspect Cflow {
> pointcut AddCflow(): cflow( execution( * WordCounter.Add( * )));
>
> // In AspectJ 1.0.6 and 1.1 here is an infinite loop here, because
> the
>
> // before advice is itself considered a join point in the cflow.
> before(): AddCflow() { System.out.println("Before advice call" ); }
> }
>
> CflowWeave.lst
>
> WordCounterDemo.java
> WordCounter.java
> Cflow.aj
>
>
> Which compiles with:
>
> ajc -argfile CflowWeave.lst
>
> And runs with:
>
> java -classpatch "%CLASSPATH;./" WordCounterDemo
>
> Gives the output
>
> Adding This, as word#1
> Exception in thread "main" java.langStackOverflowError
>
>
>
> _______________________________________________
> aspectj-users mailing list
> aspectj-users@xxxxxxxxxxx
> http://dev.eclipse.org/mailman/listinfo/aspectj-users
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