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From Bruno Dumon <br...@outerthought.org>
Subject RE: is it possible to cache sql queries?
Date Wed, 15 Mar 2006 09:07:43 GMT
On Tue, 2006-03-14 at 23:04 +0100, Ard Schrijvers wrote:
> > Yeah, good call.  I was actually thinking of something that could 
> > override the caching on an entire pipeline.  Then it could be 
> > used for 
> > other things like grabbing rss feeds or something.  For example:
> > 
> > <map:pipeline type="forcedcaching">
> >   <map:parameter name="expires" value="access plus 1 hours"/>
> >   ...
> > </map:pipeline>
> > 
> 
> Don't build it yourself!! There is just a pipeline exactly doing what you want: Use the
exiring pipeline:
> 
> <map:pipe logger="sitemap.pipes.expires" name="expires" src="org.apache.cocoon.components.pipeline.impl.ExpiresCachingProcessingPipeline">
>     <parameter name="cache-expires" value="180"/> <!-- default cache time =
3 min -->
> </map:pipe>
> 
> Now use :
> <map:pipeline  type="expires" internal-only="false">
>      <map:parameter name="cache-key" value="{define your own cache key here: if you
leave it empty the url without request-params will be used as cache-key}"/>
>      <map:parameter name="cache-expires" value="60"/> <!-- override here your
default expire -->
>   <map:match .... 
> 	your matchers here...
> 
> That is all: 
> 
> In the cache-key you can also take request-params like:  <map:parameter name="cache-key"
value="{0}-{request-param:page}" /> <!-- {0} = pipeline -->
> 
> There is certainly no need to write your own caching mechanism for
> this...if this cached result is not returned fast enough from cocoon,
> since cache-key lookups and validity checks are still done we have a
> (probably not yet committed to cocoon) version of the
> ExpiresCachingProcessingPipeline performing MUCH faster for complex
> pipelines. 

This is interesting, I have been thinking about something like that
myself. Any chance of contributing it to Cocoon?

-- 
Bruno Dumon                             http://outerthought.org/
Outerthought - Open Source, Java & XML Competence Support Center
bruno@outerthought.org                          bruno@apache.org


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