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package Memoize::ExpireFile;
=head1 NAME
Memoize::ExpireFile - test for Memoize expiration semantics
=head1 DESCRIPTION
See L<Memoize::Expire>.
=cut
use Carp;
sub TIEHASH {
my ($package, %args) = @_;
my %cache;
if ($args{TIE}) {
my ($module, @opts) = @{$args{TIE}};
my $modulefile = $module . '.pm';
$modulefile =~ s{::}{/}g;
eval { require $modulefile };
if ($@) {
croak "Memoize::ExpireFile: Couldn't load hash tie module `$module': $@; aborting";
}
my $rc = (tie %cache => $module, @opts);
unless ($rc) {
croak "Memoize::ExpireFile: Couldn't tie hash to `$module': $@; aborting";
}
}
bless {ARGS => \%args, C => \%cache} => $package;
}
sub STORE {
my ($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 {
my ($self, $key) = @_;
my $old_date = $self->{C}{"T$key"} || "0";
my $cur_date = pack("N", (stat($key))[9]);
if ($self->{ARGS}{CHECK_DATE} && $old_date gt $cur_date) {
return $self->{ARGS}{CHECK_DATE}->($key, $old_date, $cur_date);
}
return $old_date ge $cur_date;
}
1;
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