package Memoize::ExpireFile;

=head1 NAME

Memoize::ExpireFile - test for Memoize expiration semantics

=head1 DESCRIPTION

See L<Memoize::Expire>.

=cut

$VERSION = '1.03';
use Carp;

my $Zero = pack("N", 0);

sub TIEHASH {
my ($package, %args) = @_;
my $cache = $args{HASH} || {};
bless {ARGS => \%args, C => $cache} => $package;
}


sub STORE {
# print "Expiry manager STORE handler\n";
my ($self, $key, $data) = @_;
my $cache = $self->{C};
my $cur_date = pack("N", (stat($key))[9]);
$cache->{"C$key"} = $data;
$cache->{"T$key"} = $cur_date;
}

sub FETCH {
my ($self, $key) = @_;
$self->{C}{"C$key"};
}

sub EXISTS {
# print "Expiry manager EXISTS handler\n";
my ($self, $key) = @_;
my $cache_date = $self->{C}{"T$key"} || $Zero;
my $file_date = pack("N", (stat($key))[9]);#
# if ($self->{ARGS}{CHECK_DATE} && $old_date gt $cur_date) {
# return $self->{ARGS}{CHECK_DATE}->($key, $old_date, $cur_date);
# }
my $res = $cache_date ge $file_date;
# print $res ? "... still good\n" : "... expired\n";
$res;
}

1;