Re: [htmltmpl] cache-ing question

[Thilo Planz]

Hi,

I have a mod_perl/CGI::Application program that I've written that populates
a HTML::Template with a list of files that are on the server.

I'd like to cache that list, based on the URL, so that it doesn't have to do
a readdir(), grep() and also a TreeBuilder to get the TITLE everytime
someone visits the program.

Has anyone done something similar and can share any tips?

Since you are using mod_perl, you can just create save your result in any variable that stays around.
Assuming your data is stored in a hashref (or any other scalar) you could do something like

sub get_directory_data{
return $MyCache::DirectoryData if defined $MyCache::DirectoryData;
# create the cache
my $data = .... do something here ...
$MyCache::DirectoryData = $data;
return $data;
}

if you want to refresh your cache after some time, you can also set up a timestamp.

Does the cache-ing in HTML::Template also cache the params?

No, and that would be a bad idea, because usually you do not want to have any old params around but start out fresh.

If not, then
what is it cache-ing?  Just the template itself?

It is caching a parsed instance of the template.
Using a cache saves you the time to read the template from the disk and transforming it into the internal parse-tree structure.

If it is, it looks like in
the docs, it caches, based on the filename - so if I'm using 1 template for
all those lists, then should I break it up into (the number of list
possibilites # {14}) templates?

If those 14 have the same HTML and only differ in the content of the parameters, do not break it up.


Cheers,

Thilo



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