Re: first steps with nanning

 --- Christoph Sturm <[email protected]> skrev: >
hi jon!
> 
> thanks for helping me out. It really seems that
> theres almost no 
> documentation for nanning, but thats not a problem,
> because the code looks 
> very clear. But I still have some more questions:

No problem at all. As I said, I promise I will answer
any question until proper documentation is in there.

> for example this class:
> 
> public class DirectoryEntryAspect implements Aspect
> {
>     Pointcut objectsHavingDirectoryEntryAttibute = 
> P.classAttribute("directoryEntry");
> 
> 
>     public void introduce(AspectInstance
> aspectInstance) {
>        
>
objectsHavingDirectoryEntryAttibute.introduce(aspectInstance,
> new 
> Mixin(DirectoryEntry.class, new
> DirectoryEntryImpl()));
>     }
> 
>     public void advise(AspectInstance
> aspectInstance) {
>         //To change body of implemented methods use
> Options | File 
> Templates.
>     }
> }
> 
> I think introduce is called for every object that
> the aspectsystem creates, 
> and i decide with the pointcut where to apply it.
> But with the code above I 
> create a new DirectoryEntryImpl every time the
> function is called, and not 
> only when the introduction really is applied. Is
> there a better way to 
> write this?

Actually that *is* documented. :-)
http://nanning.snipsnap.org/space/Config
Basically you put an
if(pointcut.introduceOn(instance)) around there. Which
is probably better.

> > With aspects you mean mixins and interceptors
> right?
> > You can do the same thing if you use AspectSystem.
> You
> > just do aspectSystem.newInstance(obj.getClass()).
> 
> ok, i will try that. But it seems strange to me that
> obj.getClass() doesnt 
> return the classIdentifier, but Proxy$0. Does it
> work anyway?

Ah. Ooops... You're absolutely right, it probably
won't work. I'd do the following then instead:
aspectSystem.newInstance(Aspects.getAspectInstance(obj).getClassIdentifier());


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