Re: JXTG and caching

[Sylvain Wallez]

Leszek Gawron wrote:
While almost everybody buried XSP it has got one great feature that 
JXTG  lacks: it's cacheable. I know that there is no way to implement 
automatic JXTG caching but what if I know on what env does jx template 
operate. If I know that it is for example only request param "abc" and 
"bcd" and session attribute "xxx" then I know when I can use cached 
entry. The question is: how?

Should I extend JXTemplateGenerator so it is a cached component? I 
understand it gets the validity methods to implement then. So every 
time I call my extended component from flow I pass also the validity 
calculated in flow. Something like this:

function niceCachedResponse() {
  var cacheKey = cocoon.request.get( "abc" ) + "!!spacer!!"
                    + cocoon.request.get( "bcd" ) + "!!spacer!!"
                    + cocoon.session.getAttribute( "xxx" );
  var pageValidity = new DeltaTimeCacheValidity( 60 * 60 * 24 );
                                                // one day
  cocoon.sendPage( "view/cached.jx", {
                                     JXTGExtCacheKey: cacheKey,
                                     JXTGExtpageValidity: pageValidity
                                     someOtherBizData: data } );
}
Does it have a chance to work ?

Well, it _could_ have a chance to work, but flowscript is definitely not 
the appropriate location to compute cache information for an element of 
the view pipeline.

The problem with JXG is that the template is the generate() method 
_only_ whereas an XSP is the full class, allowing to define getKey() and 
getValidity().

So what about adding two optional attributes on the template's root 
element, defining the cache information?

<page
   xmlns:jx="http://apache.org/cocoon/templates/jx/1.0";
   jx:cache-key='${cocoon.request.get("abc") + "!!spacer!!" + 
cocoon.request.get("bcd")....'
   jx:cache-validity='${new DeltaTimeCacheValidity(60 * 60 * 24)}'>
   ... template ....
</page>

WDYT?
Sylvain
--
Sylvain Wallez                                  Anyware Technologies
http://www.apache.org/~sylvain           http://www.anyware-tech.com
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