Re: [aspectwerkz-user] Advisable.aw_addAdvice at a class definition level

Hi Derek.

Proxy based AOP is for per-instance deployment of aspects only. E.g.
you add aspects to a single instance.

If you want to weave into the class and have it affect all instances
of this class you should use the regular way of using AW. E.g.:
- aop.xml
- startup options for the VM etc.

See f.e. this article (a bit outdated but not too much):
http://docs.codehaus.org/display/AW/Hello+World

Good luck.
/Jonas

On 11/23/05, [email protected] <[email protected]> wrote:
> Hi All,
>
> I am new to Aspects and this may be a stupid question so apologies in advance if it is.
>
> I am using the Advisable interface to add some BeforeAdvice behaviour to a method call on an object I created with the Proxy.newInstance() method.  This is well and good, but what I really want to do is to add the given BeforeAdvice to all instances of the class as I will have no control over its instantiation in reality.  I need to use the Java API for this as these pointcuts will be specified on the fly.
>
> I have attached a small class below to demonstrate the problem a bit more effectively than via my words.
>
> Any help would be greatly appreciated.
>
> Derek
>
> public class Callback {
>
>     public void step1() {
>         System.out.println("    - TraceMe1.step1");
>         step2();
>     }
>
>     protected void step2() {
>         System.out.println("        - TraceMe1.step2");
>     }
>
>     public static void main(String[] args) {
>
>         // get a proxy instance
>         System.out.println("\nINFO:: ------ get a weaved proxy to the Callback class -----");
>         Callback callback = (Callback) Proxy.newInstance(Callback.class, false, true);
>
>         // adding around interceptor using Advisble API
>         System.out.println("\nINFO:: ------ adding aspects on the fly -----");
>         ((Advisable) callback).aw_addAdvice(
>                 "execution(* *.step1())",
>                 new BeforeAdvice() {
>                     public void invoke(JoinPoint jp) throws Throwable {
>                         Object target = jp.getTarget();
>                         System.out.println("about to call step1() in Target: " + target);
>                     }
>                 }
>         );
>
>         // invoking the method chain with the added around interceptor
>         System.out.println("**** callback.step1()");
>         callback.step1();
>
>         // what do I need to do to get the BeforeAdvice to work on this object without creating it via the Proxy?
>         Callback callbackNonProxied = new Callback();
>         System.out.println("**** callbackNonProxied.step1()");
>         callbackNonProxied.step1();
>     }
>
> Visit our website at http://www.ubs.com
>
> This message contains confidential information and is intended only
> for the individual named.  If you are not the named addressee you
> should not disseminate, distribute or copy this e-mail.  Please
> notify the sender immediately by e-mail if you have received this
> e-mail by mistake and delete this e-mail from your system.
>
> E-mail transmission cannot be guaranteed to be secure or error-free
> as information could be intercepted, corrupted, lost, destroyed,
> arrive late or incomplete, or contain viruses.  The sender therefore
> does not accept liability for any errors or omissions in the contents
> of this message which arise as a result of e-mail transmission.  If
> verification is required please request a hard-copy version.  This
> message is provided for informational purposes and should not be
> construed as a solicitation or offer to buy or sell any securities or
> related financial instruments.
>
>


--
Jonas Bonér
Terracotta, Inc.

http://www.terracottatech.com
http://blogs.codehaus.org/people/jboner/