Re: Best way to pass parameter to custom TemplateLoader?

You should encode the relevant information from the HttpServletRequest
into the template name. For example, you could have template names
like "tree1://foo/bar.ftl" and "tree2://foo/bar.ftl" and so on. Then
your TemplateLoader should delegate to other TemplateLoader-s based on
the part before the "://" (which can be anything BTW, like even
"user=joe,application=accounting://"). If you wonder why
"tree1://foo/bar.ftl" is better than "tree1/foo/bar.ftl", it's because
absolute paths in bar.ftl, like in <#import "/baaz.ftl" as b>, will be
resolved to "tree1://baaz.ftl" in the first case, but to "baaz.ftl",
which is not correct. (You could still do cross-tree inclusions
explicitly, like with "tree2://something.ftl".)

-- 
Best regards,
 Daniel Dekany


Monday, July 11, 2011, 7:04:54 PM, Chris wrote:

> I'm trying to implement a custom TemplateLoader for freemarker. This 
> loader needs to examine the HttpServletRequest to know where to get the
> template source.
>
> Unfortunately, Configuration.getTemplate() does not provide a way to 
> pass arbitrary parameters to the TemplateLoader.
>
> One possible solution is to use some kind of ThreadLocal scheme. I'm 
> concerned that this may not work because in Jetty, our app server, 
> there's some fancy nio module that handles multiple connections per 
> thread, and I don't entirely understand how it works. Plus I'm 
> suspicious of anything that could lead to hard-to-debug threading issues.
>
> Another way would be to create an Environment variable and add a custom
> attribute to it, but unfortunately it appears that an Enviroment can 
> only get created after the template has been created.
>
> I'm stuck.
>
>
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------------------------------------------------------------------------------
All of the data generated in your IT infrastructure is seriously valuable.
Why? It contains a definitive record of application performance, security 
threats, fraudulent activity, and more. Splunk takes this data and makes 
sense of it. IT sense. And common sense.
http://p.sf.net/sfu/splunk-d2d-c2