Skip to main content
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [List Home]
Re: [aspectj-users] Newbie Question: Aspect behaviour?
I'm having a Homer Simpson "D'oh!" moment. :-) I should have figured that one out on my own. Perhaps if I hadn't been so frustrated with the other problem I would have seen that....
I'm really glad you happened by. I was afraid this group was only active weekdays and that everyone had gone home by now so that I'd have to wait for Monday to understand what was going wrong.... 

Thanks again, Andy!

--
Rhino

On 2012-02-24 18:16, Andy Clement wrote:

Do I need to do something more involved like "de-registering" a pointcut
from some kind of list kept by the system if I don't need it any more?

There is nothing too complex here.  It is doing as you asked, you need
to remember that there are two methods called count in the system.
Test01.count() and CountUtils.count() - both which take String,String
and return an int.  You didn't say which one you wanted (your first
pointcut specifies Test01 but your new pointcut doesnt say which one
it is interested in).

So you are seeing the before/after applying to the call to
Test01.count() and then the same advice applying to the call that
method makes to CountUtils.count.

cheers,
Andy

On 24 February 2012 15:11, Rhino<rhino1@xxxxxxxxxxxx>  wrote:

This is the second of my newbie questions about AspectJ. See "Newbie
Questions: Biggest Issue" for the previous one....

My next question is about some odd behaviour I got when I added a second
pointcut that would have involved the same method of my play program. (The
previous email contains the full contents of the play program.)

When I had this as my aspect:

====================================================

package test;

public aspect LogCount {

    pointcut howManyNeedles() : execution(* Test01.count(..));

//    pointcut howManyNeedles2() : call(int count(String, String));

    /* First Before */
    before() : howManyNeedles() {
        System.out.println("About to count...."); //$NON-NLS-1$
    }

    /* First After */
    after() returning() : howManyNeedles() {
        System.out.println("...Needles counted");  //$NON-NLS-1$
    }

}



=====================================================

The "About to count...." and "...Needles counted" lines got printed once
each as expected.

Then I changed the code by commenting out pointcut howManyNeedles() and
creating a pointcut howManyNeedles2(). Then I changed all incidents of
howManyNeedles() to howManyNeedles2() in the "before" and "after" so that
the code looked like this::

=======================================================
package test;

public aspect LogCount {

//    pointcut howManyNeedles() : execution(* Test01.count(..));

    pointcut howManyNeedles2() : call(int count(String, String));

    /* First Before */
    before() : howManyNeedles2() {
        System.out.println("About to count...."); //$NON-NLS-1$
    }

    /* First After */
    after() returning() : howManyNeedles2() {
        System.out.println("...Needles counted");  //$NON-NLS-1$
    }

}
=======================================================

Much to my surprise, I got "About to count..." TWICE, followed by
"...Needles counted", also twice.

Why did that happen? I would have thought I'd get those two lines once each
since howManyNeedles() was now commented out but it still seemed to be in
effect despite that.

Do I need to do something more involved like "de-registering" a pointcut
from some kind of list kept by the system if I don't need it any more?

--
Rhino
_______________________________________________
aspectj-users mailing list
aspectj-users@xxxxxxxxxxx
https://dev.eclipse.org/mailman/listinfo/aspectj-users

_______________________________________________
aspectj-users mailing list
aspectj-users@xxxxxxxxxxx
https://dev.eclipse.org/mailman/listinfo/aspectj-users

Back to the top