Re: [Simpleweb-Support] Content Based Resolving

[Niall G. <gal...@ya...>]

Hi Brian,

With regard to directory references that do not end
with "/", this is handled in the FileEngine
implementation. You can delegate to this when you have
to download static content such as images.

Regarding content based resolving, it would certainly
be an attractive feature. However, how does a template
engine know which files are templates? A template with
no template markup is still a template. In any event
the templating system may have to parse the template
to figure out if it is a template, which could be
slow. I cannot comment too much on Freemarker, is it
able to peek into files and determine whether it is a
template or not?

Finally, why not resolve in reverse. For instance let
everything be a template, and match images and other
non-text content to a specific service. For instance

resolve match=”*” name=”template”
type=”example.TemplateService”
resolve match=”/*.zip” name=”file”
type=”example.FileService”
resolve match=”/images/*” name=”file”
type=”example.FileService”

Something that may interest you is the tiles
implementation in simple.template. It does not use a
file extension, instead it caches mismatches. So it
assumes everything is a template, if after a peek it
turns out not to be this information is cached, so a
second peek is not performed. This somewhat reduces
the overhead of peeking into the file.

Niall

--- Brian Davis <wic...@gm...> wrote:

> Hmm..
> 
> The URL resolver is useful under certain contexts...
> However.. I can
> envision at least 2 scenerios in which I would have
> better luck with a
> content based resolver. Let me illustrate..
> 
> Let's say for example that I want to have a url
> resolve to my
> directorylistingservice... how would i write a regex
> to support that..
> while link */ is easy.. what about urls that don't
> end in /..
> 
> a more appropriate check might be .... if (new
> File(requestPath).isDirectory() && canRead())
> 
> Scenerio two..
> 
> Basically I want to use a template engine such as
> FreeMarker on files.
> However, I want to use the simple framework to
> return everything
> else.. (those things that are not FreeMarker
> templates)... Now you
> might say that link("*.ftl", FreeMarkerService) is
> the way to do it..
> 
> However, it would be better if I could forget the
> file extension and
> use FreeMarker syntax in .txt, .html, .csv, .xml..
> in this way the web
> server could handle the mime typing and the
> freemarker engine could
> handle the substitution. There is also a case here
> for contextual
> urls... the idea that urls are important and you
> shouldn't confuse the
> user by using urls that they dont understand..
> 
> What I would like to see is a way to pass requests
> to the templating
> engine.. such that if
> TemplateEngine.isTemplate(path) returns true
> that the request is passed on to the
> TemplateService..
> 
> Any thoughts would be much appreciated.
> 
> Brian
> 
> 
>
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Niall Gallagher


		
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