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From Unico Hommes <un...@hippo.nl>
Subject Re: Caching JXTemplate
Date Tue, 06 Jul 2004 09:52:46 GMT
Unico Hommes wrote:

> I am carrying this over to dev@ so other developers can comment.
>
> Leszek Gawron wrote:
>
>> Unico Hommes wrote:
>>

<snip/>

>>>
>>> Oh but I think I see now. The cache-key and cache-validity objects 
>>> are associated with the compiled template object using template 
>>> properties. The compiled template in turn is cached directly by the 
>>> generator using the validity of the src of the generator. That 
>>> should work.
>>>
>>> So now how to use this feature. If I read this correctly cache-key 
>>> and cache-validity attributes can be specified on an element 
>>> anywhere in the xml:
>>>
>>> <element jx:cache-key="${cacheKeyExpression}" 
>>> jx:cache-validity="${cacheValidityExpression}" />
>>
>>
>>
>> Yes it is. I am thinking about a slight change. Right now every xml 
>> node is parsed for jx:* attributes. What I would like to do is to 
>> introduce
>> <jx:processing instruction name="cache-key" value="${expr}"/>
>> wdyt?
>>
>
> Yes, I agree it would be better not to check each element for these 
> attributes. <jx:processing-instruction/> sounds like a good option to me.
>

There is one other thing. The cache key that is returned by 
JXTemplateGenerator should be the src + jx:cache-key attribute value. 
Since the jx:cache-key is only a hash of the objects that are used in 
the template. These could, in theory, be the same as those objects used 
by another template. Therefore it is neccessary to also qualify the 
cache key with location of the template.

-- 
Unico

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