Re: [aspectj-users] Capture current value for set pointcut

[Ashley Williams <ashley.williams@xxxxxx>]

I do create one backing event handler aspect for every pojo with a perthis clause, but unfortunately the aspect is in a generic framework package. Also I capture all fields marked with an annotation so I don't even know their names:

    void around(Object arg) : set(@ModelProperty * *.*) && args(arg) {...}

And I am basing this around fields rather than getters and setters. This may turn out to be a mistake, in which case I will use your before() advice idea.

Cheers
- Ashley

-----aspectj-users-bounces@xxxxxxxxxxx wrote: -----

>To: aspectj-users@xxxxxxxxxxx
>From: Dean Wampler <dean@xxxxxxxxxxxxxxxxxxxxx>
>Sent by: aspectj-users-bounces@xxxxxxxxxxx
>Date: 06/16/2008 03:03PM
>Subject: Re: [aspectj-users] Capture current value for set pointcut
>
>You should be able to get the current value if you use before advice.
>Of the top of my head (and hence with likely errors...):
>
>before(MyClass object): set(* Class.foo) && this(object) &&
>args(newValue) {
>        
>System.out.println("Old: "+object.getFoo());
>        
>System.out.println("New: "+newValue);
>}
>
>This assumes you have a "getFoo()" method. If so, be careful about
>advice on get(* Class.foo)!  Alternatively, you could reference
>object.foo directly if foo is package private and the aspect is in
>the same package, etc.
>
>dean
>
>On Jun 16, 2008, at 7:55 AM, Ashley Williams wrote:
>
>Hi,
>
>
>I would like to be able to inspect the current value of a field in
>addition to the value that is being assigned to it during the
>application of my advice. I am using the set pointcut designator in
>my advice and I can determine the name of the field using
>thisJoinPoint.getSignature().getName(), but not the value.
>
>
>This is for an automatic event mechanism where I need name, oldValue
>and newValue.
>
>
>Is this even possible?
>
>
>Thanks
>
>- Ashley
>
>
> 
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>Dean Wampler, Ph.D.
>dean at objectmentor.com
>http://www.objectmentor.com
>See also:
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>  AOP advocacy site
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