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###############################################################################
# Purpose : Apply caching to another resolver
# Author : John Alden
# Created : Aug 2006
###############################################################################
package Email::MIME::CreateHTML::Resolver::Cached;
use strict;
use Data::Serializer;
use URI::Escape;
our $VERSION = '1.042';
sub new {
my ($class, $args) = @_;
my $self = {
'Resolver' => $args->{resolver},
'Cache' => $args->{object_cache},
'base' => $args->{base},
};
return bless($self, $class);
}
sub get_resource {
my ($self, $uri) = @_;
my $args = {'uri' => $uri, 'base' => $self->{base}, 'resolver' => ref $self->{Resolver}};
my $key = join('&', map {$_ . '=' . URI::Escape::uri_escape($args->{$_})} grep {defined $args->{$_}} sort(keys %$args));
my $cache = $self->{Cache};
my $serialized = $cache->get( $key );
my $ds = Data::Serializer->new();
my @rv;
if ( defined $serialized ) {
my $deserialized = $ds->deserialize( $serialized );
@rv = @$deserialized;
}
else {
@rv = $self->{Resolver}->get_resource( $uri );
my $serialized = $ds->serialize( \@rv );
$cache->set( $key,$serialized );
}
return @rv;
}
1;
=head1 NAME
Email::MIME::CreateHTML::Resolver::Cached - wraps caching around a resource resolver
=head1 SYNOPSIS
my $o = new Email::MIME::CreateHTML::Resolver::Cached(\%args)
my ($content,$filename,$mimetype,$xfer_encoding) = $o->get_resource($uri)
=head1 DESCRIPTION
This is used by Email::MIME::CreateHTML to load resources.
=head1 METHODS
=over 4
=item $o = new Email::MIME::CreateHTML::Resolver::Cached(\%args)
%args can contain:
=over 4
=item base
Base URI to resolve URIs passed to get_resource.
=item object_cache (mandatory)
A cache object
=item resolver (mandatory)
Another resolver to apply caching to
=back
=item ($content,$filename,$mimetype,$xfer_encoding) = $o->get_resource($uri)
=back
=head1 AUTHOR
Tony Hennessy, Simon Flack and John Alden with additional contributions by
Ricardo Signes <rjbs@cpan.org> and Henry Van Styn <vanstyn@cpan.org>
=head1 COPYRIGHT
(c) BBC 2005,2006. This program is free software; you can redistribute it and/or modify it under the GNU GPL.
See the file COPYING in this distribution, or http://www.gnu.org/licenses/gpl.txt
=cut
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