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# Movable Type (r) Open Source (C) 2001-2008 Six Apart, Ltd.
# This program is distributed under the terms of the
# GNU General Public License, version 2.
#
# $Id: Session.pm 2505 2008-06-04 07:54:01Z fumiakiy $
package MT::Cache::Session;
use strict;
use MT::Session;
sub new {
my $class = shift;
my (%param) = @_;
$param{'ttl'} ||= 0;
$param{'kind'} ||= 'CO';
my $self = bless \%param, $class;
return $self;
}
sub get {
my MT::Cache::Session $self = shift;
my ($key) = @_;
my $record;
if ( $self->{ttl} ) {
$record = MT::Session::get_unexpired_value(
$self->{ttl}, { id => $key, kind => $self->{kind} } );
}
else {
$record = MT::Session->load( { id => $key, kind => $self->{kind} } );
}
return unless $record;
return $record->data;
}
sub get_multi {
my MT::Cache::Session $self = shift;
my @keys = @_;
my @tmp = MT::Session->load( { id => \@keys, kind => $self->{kind} } )
or return;
my @records;
if ( $self->{ttl} ) {
foreach my $record (@tmp) {
if ( $record->start() < time - $self->{ttl} ) {
$record->remove;
next;
}
push @records, $record;
}
}
else {
@records = @tmp;
}
my %values = map { $_->id => $_->data } @records;
return \%values;
}
sub delete {
my MT::Cache::Session $self = shift;
my ($key, $time) = @_;
MT::Session->remove( { id => $key, kind => $self->{kind} } )
or return 0;
1;
}
*remove = \&delete;
sub add {
_set("add", @_);
}
sub replace {
_set("replace", @_);
}
sub set {
_set("set", @_);
}
sub _set {
my $cmdname = shift;
my MT::Cache::Session $self = shift;
my ($key, $val, $exptime) = @_;
my $cache = MT::Session->load({
id => $key,
kind => $self->{kind},
});
$cache->remove() if $cache;
$cache = MT::Session->new;
$cache->set_values({
id => $key,
kind => $self->{kind},
start => time,
data => $val,
});
$cache->save();
}
sub flush_all {
my MT::Cache::Session $self = shift;
MT::Session->remove({ kind => $self->{kind} });
}
sub purge_stale {
my MT::Cache::Session $self = shift;
my ( $ttl ) = @_;
MT::Session->remove(
{ kind => $self->{kind}, start => [ undef, time - $ttl ] },
{ range => { start => 1 } }
);
1;
}
sub DESTROY {}
1;
__END__
=head1 NAME
MT::Cache::Session - Utility package caching data in MT::Session record.
=head1 SYNOPSIS
my $cache = MT::Cache::Session->new({ttl => 10});
my $data = $cache->get($key);
$cache->set($key => $value);
my $hash = $cache->get_multi($key1, $key2);
=head1 DESCRIPTION
I<MT::Cache::Session> provides a wrapper interface around I<MT::Session>,
with the interface similar to Cache::Memcached.
=head1 USAGE
=head2 $cache->get
Retrieves a key from the cache. Returns the value or undef.
=head2 $cache->get_multi
Retrieves multiple keys from the cache doing just one query.
Returns a hashref of key/value pairs that were available.
=head2 $cache->set
Unconditionally sets a key to a given value in the memcache. Returns true
if it was stored successfully.
=head2 $cache->delete
Deletes a key. You may also use the alternate method name B<remove>,
so MT::Cache::Session looks like the L<Cache::Cache> API.
=head2 $cache->flush_all
Empty all the caches.
=head2 $cache->purge_stale
Deletes all the cached objects that are already too old.
Takes one argument: $ttl specifies the duration that is considered stale.
=head1 AUTHOR & COPYRIGHT
Please see L<MT/AUTHOR & COPYRIGHT>.
=cut
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