Re: [aspectj-users] around advice on constructors

[Wes Isberg <wes@xxxxxxxxxxxxxx>]

chicanery it would be!  The result of an IFaceImpl constructor 
call is IFaceImpl.  It would be bad to permit that to be a
supertype of IFaceImpl.  A subclass would work.

See also the FAQ entry 
  "How do I work with an object right when it is created?" 
http://dev.eclipse.org/viewcvs/indextech.cgi/~checkout~/aspectj-home/doc/faq.html#q:adviseconstructors

For the ambitious contributor, Gregor noted that proxying 
was on the table at one point in the declare space.  
See the email titled
  
  RE: interecepting all calls -- was Re: [aspectj-users]... 

This is a commonly-sought pattern.  If you find a new solution,
please do post it.

Thanks -
Wes

Daniel McAllansmith wrote:
> 
> Hi,
> 
> I'm trying to replace all newly created instances of an interface (Iface) with
> dynamic proxies which delegate to the actual new instance.
> This is pretty straight forward if I mandate that all instances must be
> created through factories with a well-known method which returns Iface
> (rather than IfaceImpl).
> 
> Ideally I would like to be able to use code like the following:
> 
> Iface if = new IfaceImpl();
> 
> and an around() which creates a Proxy implementing the classes implemented by
> the result of proceed()
> 
> unfortunately this results in a ClassCastException, the dynamic proxy is not
> an instance of IfaceImpl, only Iface.
> 
> Does anybody know of any chicanery which might allow me to do this?
> 
> Thanks
> Daniel
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