Re: [aspectj-users] suspicious super call interception

[Kristof Jozsa <kristof.jozsa@xxxxxxxxx>]

Hi Andy,

I think your sample is about something else. The code I pasted has a child class which in fact doesn't hold the method getting called, therefore methodcall() and super.methodcall() results in an identical behaviour just one of them gets weaved while the other doesn't.

My target was to simply create a pointcut which can intercept childclasses of javax.xml.ws.Service calling their parent's getPort() method. See my original code:

pointcut wsGetPortCall() : 
ÂÂÂ ÂÂÂ call(Object javax.xml.ws.Service+.getPort(..));

but this in fact behaved a bit differently as expected as it missed the cases where other programmers typed super.getPort() and not simply getPort() in their code (and they did not had a getPort() body overwriting the superclass' one). This was the barebone example code which demonstrates the exact problem I'm having:

new Service(null, null) {
ÂÂÂ @SuppressWarnings("unused")
ÂÂÂ public void boo() {
ÂÂÂ ÂÂÂ super.getPort(null);ÂÂÂ // (1)
ÂÂÂ ÂÂÂ getPort(null);ÂÂÂÂÂÂÂÂÂÂÂÂ // (2)
ÂÂÂ }
};

I hope it makes more sense now. My question is how to accomplish my original goal? Is it possible?

thanks,
K

On Mon, Sep 28, 2009 at 5:26 PM, Andy Clement <andrew.clement@xxxxxxxxx> wrote:

public class A {
Âpublic static void main(String []argv) {
 ÂB b = new B();
 Âb.run();
Â}
}


class Base {
Âpublic void getPort() {
 ÂSystem.out.println("Base.getPort()");
Â}
}

class B extends Base {
Âpublic void run() {
 Âsuper.getPort();
 ÂgetPort();
Â}
Âpublic void getPort() {
 ÂSystem.out.println("B.getPort()");
Â}
}

javac A.java
java A
Base.getPort()
B.getPort()

they can do different things. ÂIf your question is why your advice
didn't match, it is because super calls are not join points. ÂAnd that
is probably a hangover from the old days of source weaving I think,
which has just never been revisited.

Andy


2009/9/28 Kristof Jozsa <kristof.jozsa@xxxxxxxxx>:

> Sample code:
>
> public aspect WSPortFixerInterceptor {
> ÂÂÂ pointcut wsGetPortCall() :
> ÂÂÂ ÂÂÂ call(Object javax.xml.ws.Service+.getPort(..));
>
> ÂÂÂ Object around() : wsGetPortCall() {
> ÂÂÂ ÂÂÂ return WsClientTool.getInstance().fixWebServicePort(proceed());ÂÂ //
> never mind this line
> ÂÂÂ }
>
>
> ÂÂÂ /** private inner class to verify correct interception */
> ÂÂÂ @SuppressWarnings("unused")
> ÂÂÂ private static class TestFixer {
> ÂÂÂ ÂÂÂ {
> ÂÂÂ ÂÂÂ ÂÂÂ new Service(null, null) {
>
> ÂÂÂ ÂÂÂ ÂÂÂ ÂÂÂ @SuppressWarnings("unused")
> ÂÂÂ ÂÂÂ ÂÂÂ ÂÂÂ public void boo() {
> ÂÂÂ ÂÂÂ ÂÂÂ ÂÂÂ ÂÂÂ super.getPort(null);ÂÂÂ // (1)
> ÂÂÂ ÂÂÂ ÂÂÂ ÂÂÂ ÂÂÂ getPort(null);ÂÂÂÂÂÂÂÂÂÂÂÂ // (2)
> ÂÂÂ ÂÂÂ ÂÂÂ ÂÂÂ }
> ÂÂÂ ÂÂÂ ÂÂÂ };
> ÂÂÂ ÂÂÂ }
> ÂÂÂ }
> }
>
> To my best knowledge, the two calls at (1) and (2) does the very same in
> Java, but appearently (2) gets intercepted by this aspect and (1) does not..
> what's the explanation for this behaviour?
>
> thanks,
> K
>

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