Re: [WebMacro-user] Cache templets

[Lane S. <la...@op...>]

Hi Lars,

As ebr pointed out, you can consider the #cache directive as well. This 
is in the contrib/ distro and you will probably want to consider this as 
well.

I almost exclusively use templets because of the inherent ability to 
pass in parameters. templets are extremely compelling to use in new 
template development. I discuss this at 
http://webmacro.org/BlockLevelExpressionism

I have a global file, global.tml which includes parts.tml. global.tml is 
evaluated once or on a refresh and is always made available in the 
context. See the current cvs image for 
o.w.servlets.TemplateServlet.init(). Be sure to look at how this servlet 
manages a global context. Then, consider the opening lines of a 
parts.tml, inccluded from global.tml:

#include as macro "includes/macros.wmm"
#bean $site = "org.webmacro.util.SparseProperties" scope=global

## site parameters:
#bean $site.ServiceStarted = "java.util.Date"
#bean $site.StorageService = "org.opendoors.vlh.VLHProvider" scope=static
#set $site.SMTPServer = "@MailServer@"
#set $site.SupportAddress = ["la...@op..."]
#set $site.SalesAddress = ["sa...@op..."]
#set $site.FromAddress = "su...@op..."
#set $site.BlackMailURL = "http://www.computerworld.com/securitytopics/security/cybercrime/story/0,10801,88623,00.html"
#templet $site.PageFooter {

    <DIV id="pageFooter">
      [#hrefInDialog("/privacy.html","Privacy")]
      &nbsp;[#hrefInDialog("/contact.html", "Contact Us")]
    </DIV>
    
}


It is pretty clear that I am using $site as a cache and using #bean
to instantiate the type of cache I want to use.


-Lane


Lars George wrote:

> Hi Lane,
>
> OK, I get it, that is an approach. That way I add my own CachingTool 
> and use it where I need it. Getting the scope etc. supported should 
> not be much more complicated I assume.
>
> The other question of course is if that would not be a good feature 
> for WebMacro's core as well. In general the question is what is the 
> way to go, using templets or blocks.
>
> Thanks,
> Lars
>
>
> Lane Sharman wrote:
>
>> Hi,
>>
>> With WM, you can have an object like $WMCache in the context. Then, 
>> as you evaluate a templet into a string variable, you can place the 
>> string variable into the $WMCache. The next time around, you can test 
>> for its existence subject to a lot of criteria such as user, session, 
>> time, invalidation, etc, etc.
>>
>> -Lane
>>
>>
>>
>>
>> Brian Goetz wrote:
>>
>>> You've addressed half of Lars' question -- the caching infrastructure
>>> -- but not the other half -- the integration of caching into the
>>> template language.  The approach taken by OSCache is quite cool, in
>>> that allows JSP writers to specify the interaction of caching and
>>> content quite nicely.  
>>>
>>>> Caching has been discussed a lot and there is a caching provider 
>>>> interface so you can write your own caching implementation. (As I 
>>>> have done).
>>>>
>>>> To cache individual objects, you can use a global service model to 
>>>> cache individual templates (eg, connection.wmt, statements.wmt, 
>>>> etc.) and objects (queryResultReference, queryResultDomain, 
>>>> queryResultTransaction, etc). With this kind of a model, you cache 
>>>> both the template elements and the results according to memory and 
>>>> invalidation events.
>>>>   
>>>
>
>
>
>
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-- 
Lane Sharman
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