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From "Vadim Gritsenko" <vadim.gritse...@verizon.net>
Subject RE: [Q] How to create a cached XML object in memory...
Date Wed, 03 Jul 2002 12:47:04 GMT
> From: Per Kreipke [mailto:per@onclave.com]
> 
> OVERVIEW:
> =========
> Cocoon uses Configurations from Avalon to abstract keeping common
config
> information in XML form and easily using and caching it in memory.
However,
> it doesn't quite serve my purposes (I think) because it actually
converts
> the XML into its internal format and doesn't allow XPath queries
against it.
> 
> I'm beginning to suspect that there is no such object in C2 but rather
> caching is a component service provided by another component. However,
I
> wish there already was some example of, say, a URLSource that was
being
> cached in a simple way that I could retrieve it on demand.
> 
> Specifically, each request will cause an XPath query against the XML
and
> portions of those results will be propagated to the sitemap. E.g. this
will
> all be handled by an Action.
> 
> REQUIREMENTS:
> =============
> I have some information in an XML file which is common to the entire
web app
> (file is not tiny).
> 
> For speed, I was thinking of storing it in a servlet context attribute
so
> that it was accessible everywhere.
> 
> I want to be able to execute XPath queries against it.
> 
> Some of the attributes in the file need to be propa
> 
> The XML file may be changed and should be reloaded.
> 
> Among other things, I will want to stream the XPath results into the
SAX
> stream (much like ReadDOMTransformer).
> 
> 
> SOLUTIONS:
> ==========
> 1. Use Configurations.
> - can be cached, etc.
> - doesn't allow XPath queries
> 
> 2. Use URLSource and add caching (note to self: check if it already
is).
> - how to add caching to an action (note to self: look at all the
actions,
> again)
> 
> 3. ??

Use Parser.ROLE to parse it into the DOM tree and save it into the
context. Use XPathProcessor.ROLE to query it.

Vadim


> 
> Thanks in advance for any pointers, feedback.
> 
> Per Kreipke


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