# $Id: Cached.pm,v 1.9 2005/05/06 18:30:25 andrew Exp $
use strict;
package BT::MetaInfo::Cached;
require 5.6.0;
use vars qw( $VERSION @ISA );
use Cache::FileCache;
use File::Basename;
use BT::MetaInfo;
use base 'BT::MetaInfo';
$VERSION = do { my @r = (q$Id: Cached.pm,v 1.9 2005/05/06 18:30:25 andrew Exp $ =~ /\d+/g); sprintf "%d."."%02d" x $#r, @r };
sub new
{
my $class = shift;
my $file = shift;
my $cache_settings = shift;
if (ref $file eq 'HASH') {
$cache_settings = $file;
$file = undef;
}
$cache_settings->{namespace} ||= 'BT::MetaInfo::Cached';
my $cache = new Cache::FileCache( $cache_settings );
my $obj = (defined($file)) ? _load($file, $cache) : {};
bless($obj, $class);
$obj->{cache} = $cache;
return $obj;
}
sub _load {
my $file = shift;
my $cache = shift;
my $basename = basename($file);
my $info = $cache->get( $basename );
unless (defined $info) {
$info = BT::MetaInfo::_load($file);
$cache->set( $basename, $info );
}
return $info;
}
sub save
{
my $self = shift;
my $file = shift;
my $basename = basename($file);
my $cache = delete $self->{cache};
if ( $self->SUPER::save($file, @_) ) {
my %info_hash = %$self; # unbless
$cache->set($basename, \%info_hash)
}
$self->{cache} = $cache;
}