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RE: [aspectj-users] What's the different between call and execution

To add my two cents :

With a call pointcut you are able to handle the source and the target, with an excecution pointcut you can handle the source only.

It is more academically said below.

 

Cordialement / Best regards

 

Jean-Louis Pasturel

 


De : aspectj-users-bounces@xxxxxxxxxxx [mailto:aspectj-users-bounces@xxxxxxxxxxx] De la part de Paulo Alexandre Corigo Zenida
Envoyé : mercredi 4 juin 2008 18:41
À : aspectj-users@xxxxxxxxxxx
Objet : Re: [aspectj-users] What's the different between call and execution

 

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
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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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