[testing with AOP]

[ifrit]

Hi,

i'm new with AOP, and with JBoss too. I'd like to test some applications in simulated time. For that i want to use JBoss AOP, i looked up for a week now, but i don't find a way to increase time speed in my application with AOP. If any one got an idea, i'd like to hear it.

Thanks.

[ifrit]

Well i'll add more to my request.

What i'd like to do is replace call of new Date();
with my own call of new Date(), that is a Date that is speed up.

Is that realistic??

[kabirkhan]

A constructor caller pointcut could help, the question is if the overhead of this is worth the performance increase of your Date class.

Please take a look at the tutorial that comes with the AOP distribution :-)

[ifrit]

well, i tried many things, but for the moment i can't intercept a constructor call.

public class HelloAOP {
 public void callMe () {
 System.out.println("AOP");
 }
 /**
 *
 */
 public static void main (String args[] ) {
 new HelloAOP().callMe();
 }
}

jboss-aop.xml file

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<aop>
 <!--aspect class="IOExceptionInjector" scope="PER_VM"/>
 <bind pointcut="call(* $instanceof{java.io.BufferedReader}->readLine()) AND within(HelloAOP)">
 <advice name="throwIO" aspect="IOExceptionInjector"/>
 <interceptor class="HelloAOPInterceptor"/>
 </bind-->
 <bind pointcut="call(*->new(..))">
 <interceptor class="HelloAOPInterceptor"/>
 </bind>
</aop>

import org.jboss.aop.advice.Interceptor;
import org.jboss.aop.joinpoint.Invocation;

public class HelloAOPInterceptor implements Interceptor {

 public String getName() {

 return "HelloAOPInterceptor";
 }


 public Object invoke(Invocation invocation) throws Throwable {
 System.out.println("Hello, ");
 return invocation.invokeNext();
 }
}

[kabirkhan]

Does the constructor tutorial work for you?

[ifrit]

well, it may be some malfunction with eclipse, now i can do the interception. it works fine, but i still got a question, is it possible to intercept

public static void main(String [] args)

, for the moment by me it appears as it doesn't work.
I'd like to do that to initialize some variables at the start of application.

Thanks all.

[ifrit]

like the other one, it doens't work for the first tries, but now it works fine. So for the moment i don"t have other question about aop, but it may come when i may try the hot deployment.

See you later.

[ifrit]

lol, a question sooner than expected.

how do i write pointcut expression for tables arguments??

for example for the function main(String [] args)

java.lang.String [] isn't accepted

[kabirkhan]

It should work if you do

"execution(public static void blah.MyClass->main(java.lang.String[])"

[ifrit]

yes it works, for the story, it was just a space beetwen String and [ that was the cause of the error, but if there is no space it works perfectly. maybe something to say in the doc.

[ifrit]

Is it possible to apply a point cut to an entire branch of packages, like for example

pointcut="..." and within(java.*)

for all class in package java and the subpackages aso.