On Thu, 2 Nov 2000, Neil Conway wrote:
> Date: Thu, 2 Nov 2000 16:45:28 -0500
> From: Neil Conway <[EMAIL PROTECTED]>
> To: ModPerl List <[EMAIL PROTECTED]>
> Subject: dynamic vs. mostly static data
>
> I'm writing a web app in mod_perl, using a PostgreSQL database
> backend and HTML::Template. In looking for ways to optimize
> performance, I noticed that although my code is doing several
> (say, 4-5) database queries per handler/webpage, a large part
> of the data (~2 queries) is mostly static (it will change
> perhaps once per week, or once per month). It's obviously
> inefficient to run these queries on the database for every
> single request.
>
> How can I 'cache' this data so that all Apache children can
> access it quickly? Is there a way to automatically update
> this cache periodically (say every 10 minutes)? Also, this
> solution should work on any reasonably modern UNIX system
> (Win32 is not important for now).
>
> I couldn't find this anywhere, but if someone tells me where,
> I'd be happy to RTFM. Ask me if you need more info.
>
> TIA,
>
> Neil
neil,
i often do something like this where i allow each individual child
process to cache it's data. i do something like this:
package Apache::Foo;
use strict;
use Apache::Constants;
use POSIX 'strftime';
use constant CACHE_EXPIRES => 3600; # one hour
use vars qw[ %CACHE ];
%CACHE = ();
sub handler {
my $r = shift;
eval {
my $expires = $CACHE{'expires'} || 0;
if ($expires < time) {
my @data = < some routine >;
my $t = HTML::Template->new(filename => 'foo.tmpl',
die_on_bad_params => 0,
cache => 1);
$t->param('data', \@data);
$CACHE{'data'} = $t->output;
$CACHE{'expires'} = time + CACHE_EXPIRES;
}
$r->print($CACHE{'data'});
};
return print_err($r, $@) if $@;
return OK;
}
1;
btw, i'd really recommend you look into using Template Toolkit. it's a
much more powerful and flexible templating system than HTML::Template,
but i digress (and might start a flame war against myself by saying this).
hth,
ky
