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From "Carsten Ziegeler" <cziege...@s-und-n.de>
Subject RE: [RT] Forwarding of internal pipeline calls
Date Mon, 08 Mar 2004 15:47:51 GMT
Sylvain Wallez wrote:
> 
> 
> Ah yes, I understand the "technically nearly impossible" now:
> - pipeline building is always under control of the 
> treeprocessor. So in that phase, this is possible.
Yes.

> - for external requests, pipeling processing occurs within 
> the treeprocessor (in the node that closes the pipeline), so 
> it's possible here also
Yes.

> - for internal requests, pipeline processing occurs outside 
> of the treeprocessor, when the caller uses 
> SitemapSource.getInputStream(). This is where the difficult 
> point is...
Yupp.

> 
> Mmmh... what we can do is give the SitemapSource an 
> error-handling processor which would just wrap the 
> error-handler (if any) in the <map:pipeline> where the 
> pipeline was built. The SitemapSource can then call that 
> special processor if a problem arises during pipeline execution.
> 
> The means for the TreeProcessor to pass this special 
> error-handling processor to the SitemapSource can be the 
> MutableEnvironmentFacade that's already considered as a 
> special case by the TreeProcessor. This class is a kind of 
> "backwards communication channel" from the Processor to the 
> SitemapSource.
> 
> I think this should work, and this solution has no impact on 
> the existing interfaces.
> 
Sounds good (and more important it sounds possible :) ). So, we just
have to do some votes (about the redirect=forwarding) and the
correct notion of this one, implement it and voila have this
nice little feature many users ask for.
Great!

Carsten


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