[PEAK] Re: first draft of a webdemo

[Phillip J. Eby]

At 12:41 AM 2/27/04 +0100, Ulrich Eck wrote:
> > > > [Files *.pwt]
> > > > file_factory = xslskins.StyleWrapperFactory(
> > > >       style_pattern="%s_style",
> > > > factory="peak.web.resources.TemplateResource" )
>
>are you sure that this is possible a.t.m ??
>
>[snippet from ResourceDirectory::__getitem__]
>
>         # look up factory for name
>         path = os.path.join(self.filename, filename)
>         if os.path.isdir(path):
>             factory = DIR_FACTORY.of(self)[prop]
>         else:
>             factory = FILE_FACTORY.of(self)[prop]
>
>         # create a reference, and dereference it
>         ref = naming.Reference(factory,
>addresses=[FileURL.fromFilename(path)])
>         obj = ref.restore(self,None)
>         obj.setParentComponent(self, filename)
>         self.cache[name] = obj
>         return obj

Aagh.  I forgot that I did it this way.


>a naming.Reference takes a factoryName as first argument,
>that is restored like this:
>
>     def restore(self, context, name):
>         factory = importObject(FACTORY_PREFIX.of(context)[self.factoryName])
>         factory = adapt(factory, IObjectFactory)
>         return factory.getObjectInstance(context, self, name)
>
>i haven't tried it, but i assume that your example would break with a
>key-error for peak.naming.schemes.<instance of StyleWrapperFactory>
>
>am i right ?

Yes, you are.  I'm going to have to fix this.  I'm not sure how, yet.  I 
can't really make Reference() take a non-string, because the point of a 
reference is to be persistable/serializable in a simple format.  On the 
other hand, I don't want to create a whole new factory interface just for 
resources, so I'd still like to be able to use Reference().

What I may do is change ResourceDirectory to check whether 'factory' 
supports naming.IObjectFactory, and if so, use it directly instead of 
asking the reference to restore itself.  Maybe there should be a naming API 
to do that, since this seems a use case that will appear other places.