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From giacomo <giac...@apache.org>
Subject Re: RT - Tree Traversal Implementation of Sitemaps and XSP
Date Wed, 24 Oct 2001 19:56:10 GMT
On Fri, 5 Oct 2001, Peter Royal wrote:

> At 12:31 PM 10/5/2001 +0200, you wrote:
> >Here I have the feeling we are doing the same mistake over again: the
> >sitemap was compiled when no hotspot tecnique was present and we had to
> >avoid excessive use of esternal recurrent logic when we could "unroll"
> >the tree traversal and let java execute it directly by transforming it
> >in code.
>
> I think the sitemap is really metadata that configures the cocoon engine.
> So in that respect are we mixing concerns by converting metadata into
> program code?
>
> I took your previous words about the removal of hotspots and applied those
> to our XSP pages in house. Before I was recreating the same java code
> repeatedly. As an answer to the hotspot issue, I moved the code into a
> separate class file with static methods, just like many of the internal
> logicsheets.
>
> I mention this because maybe we could apply some of the same techniques to
> the sitemap? Rather than generating a bunch of different methods, etc,
> could we not just compile the sitemap to a bunch of static variables
> (metadata) with method calls to do the actual work? Thus gaining some of
> the benefits of hotspotting? That might provide a migration plan towards a
> more radical design. It might also be
>
> As more and more people come on board using version 2, we need to protect
> the investment people are making in the current sitemap model. At least
> from the standpoint of providing a seamless transition to what is next, in
> both functionality and brain power required to understand.

This is a serious issue. As Berin also mentioned an approach having the
"sitemap" engines pluggable to preserve version 2.0 sitemaps and being
able to implement the next generation engine. Then people are free to
use whichever they need. Sure, this approach has the brawback that the
old sitemap engine isn't maintained and will die sooner or later.

Giacomo

>
> I have been enjoying the recent RT threads though. I do appreciate that
> such discussions take place out in the openness of the dev list. Of course
> that is what makes open source software so great :)
>
> keep hacking.
> -pete
>
>


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