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Date: Mon, 04 Nov 2002 11:21:45 -0500
From: Vadim Gritsenko <vadim.gritsenko@verizon.net>
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To: cocoon-dev@xml.apache.org
Subject: Re: <map:pipeline> confusion in 2.1
References: <3DC698E0.2040303@anyware-tech.com>
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Sylvain Wallez wrote:

> Hi team,
>
> Will preparing a presentation, I realized that the new feature in 2.1 
> that allows pipeline implementations to be defined in the 
> <map:components> section of the sitemap leads to some duplicate use of 
> <map:pipeline> and <map:pipelines> :
>
> - When used in <map:sitemap>, <map:pipelines> contains <map:pipeline> 
> elements, which define the pipeline assembly instructions. This is 
> what we've been used to up to the current 2.0.x version.
>
> - When used in <map:components>, <map:pipelines> also contains 
> <map:pipeline> elements that define the implementations of the 
> Pipeline interface to be used in the above <map:pipelines> !
>
> This duplicate use of the same element names IMHO introduces much 
> confusion when you try to explain what a "pipeline" is, as we already 
> use this word for several different things :
> - a <map:pipeline> section (logical grouping of sitemap statements)
> - the contents of a <map:match> (the instructions executed for a given 
> URI) 


This one is the mistake. You can assemble pipelines without a single 
matcher, with help of actions, selectors, etc. Or, you can have even 
signle pipeline consisting from gen/tr/serializer to serve whole URI space.


> - the chain of components that produce the response (generator, 
> transformers, and serializer).
>
> So I propose to change the name of <map:pipeline> in the 
> <map:components> part to remove this confusion (also, what about 
> document validation ?)
>
> What about
> - <map:pipeline-handler>
> - <map:pipeline-manager>
> - <map:pipeline-runner> 


I don't like it, because all the names in the sitemap currently follow 
the pattern:
  transformer (noun) - transform (verb)

Ideally, we need noun-verb pair for pipeline...

Vadim


> - something else ?
>
> Sylvain
>


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