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

Hi Jonas,

I suspected that this may be the case but appreciate the confirmation.  I'll have to rethink the approach I am taking.  Thanks for your help.

Regards,
Derek

-----Original Message-----
From: [email protected] [mailto:[email protected]]On Behalf Of Jonas Bonér
Sent: 23 November 2005 12:17
To: [email protected]
Subject: 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See f.e. this article (a bit outdated but not too much):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();
>     }
>
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--
Jonas Bonér
Terracotta, Inc.

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

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.