What Dean said is absolutely true. Anyway, I just would like to say that, additionally, a call has more information about the join point, since you can access the invocation static context, through the variable thisEnclosingJoinPointStaticPart. E.g.,
public class C {
public void foo() {
bar();
}
public void bar() {
}
}
public aspect A {
// the output will be:
// call(void C.bar())
// execution(void C.foo())
before() :
call(public void C.bar()) {
System.out.println(thisJoinPoint);
System.out.println(thisEnclosingJoinPointStaticPart);
}
// the output will be:
// execution(void C.bar())
// execution(void C.bar())
before() :
execution(public void C.bar()) {
System.out.println(thisJoinPoint);
System.out.println(thisEnclosingJoinPointStaticPart);
}
}
Kind regards,
Paulo Zenida
Dean Wampler escreveu:
> For calls, the advice is inserted just before transferring control to
> the method. For execution, the advice is inserted just after
> transferring control, within the stack frame of the method. (This is
> my naive way of viewing it.)
>
> One implication is that you have to use call pointcuts if you want to
> advise invocations of code in a 3rd-party jar that you aren't
> modifying with advice. For example, suppose you want to log all calls
> to HashMap.get() for some reason. Call pointcuts would add advice
> everywhere in your code that get() is called. If you tried to write an
> execution pointcut for the get method, it would only work if you
> inserted the advice in the JDK!
>
> An advantage of execution advice, when you can use it, is that you
> only have the overhead of advice code in one place, whereas call
> advice is inserted everywhere that target method is called.
>
> They AspectJ docs have better explanations of all this ;)
>
> dean
>
> On Jun 4, 2008, at 10:52 AM, Noppanit Charassinvichai wrote:
>
>> Can anyone please tell me what is the different between call and
>> execution in Pointcut? Thank you
>> _______________________________________________
>> aspectj-users mailing list
>> [email protected]
>> https://dev.eclipse.org/mailman/listinfo/aspectj-users
>
> Dean Wampler, Ph.D.
> dean at objectmentor.com
> http://www.objectmentor.com
> See also:
> http://www.aspectprogramming.com AOP advocacy site
> http://aquarium.rubyforge.org AOP for Ruby
> http://www.contract4j.org Design by Contract for Java5
>
>
>
>
>
> ------------------------------------------------------------------------
>
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> https://dev.eclipse.org/mailman/listinfo/aspectj-users
>
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