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    my $use_elem = delete $store_entry->{use_elem}
        or die 'Cache::Memory data structure(s) corrupted';
    $Use_Heaps{$ns}->delete($use_elem);

    # reduce size of cache iff there is no active handle
    my $size = 0;
    my $dataref = delete $store_entry->{data};
    unless (exists $store_entry->{handlelock}) {
        $size = length($$dataref);
        $Store_Sizes{$ns} -= $size;
    }

    delete $store_entry->{handlelock};

    # remove entire entry if there are no active Entry objects
    delete $Store{$ns}{$key} unless $store_entry->{rc};

    return $size;
}


# UTILITY METHODS

sub add_expiry_to_heap {
    my Cache::Memory $self = shift;
    my ($key, $time) = @_;

    my $exp_elem = Cache::Memory::HeapElem->new($self->{namespace},$key,$time);
    $Expiry_Heap->add($exp_elem);
    return $exp_elem;
}

sub del_expiry_from_heap {
    my Cache::Memory $self = shift;
    my ($key, $exp_elem) = @_;

    $Expiry_Heap->delete($exp_elem);
}

sub add_age_to_heap {
    my Cache::Memory $self = shift;
    my ($key, $time) = @_;
    my $ns = $self->{namespace};

    my $age_elem = Cache::Memory::HeapElem->new($ns,$key,$time);
    $Age_Heaps{$ns}->add($age_elem);
    return $age_elem;
}

sub add_use_to_heap {
    my Cache::Memory $self = shift;
    my ($key, $time) = @_;
    my $ns = $self->{namespace};

    my $use_elem = Cache::Memory::HeapElem->new($ns,$key,$time);
    $Use_Heaps{$ns}->add($use_elem);
    return $use_elem;
}

sub update_last_used {
    my Cache::Memory $self = shift;
    my ($key) = @_;
    my $ns = $self->{namespace};

    my $use_elem = $Store{$ns}{$key}{use_elem}
        or die 'Cache::Memory data structure(s) corrupted';

    $Use_Heaps{$ns}->delete($use_elem);
    $use_elem->val(time());
    $Use_Heaps{$ns}->add($use_elem);
}

sub change_size {
    my Cache::Memory $self = shift;
    my ($size) = @_;
    my $ns = $self->{namespace};

    $Store_Sizes{$ns} += $size;
    $self->check_size($Store_Sizes{$ns}) if $size > 0;
}

sub entry_dropped_final_rc {
    my Cache::Memory $self = shift;
    my ($key) = @_;
    my $ns = $self->{namespace};

    delete $Store{$ns}{$key} unless defined $Store{$ns}{$key}{data};
}


1;
__END__

=head1 SEE ALSO

Cache

=head1 AUTHOR

 Chris Leishman <chris@leishman.org>
 Based on work by DeWitt Clinton <dewitt@unto.net>

=head1 COPYRIGHT

 Copyright (C) 2003-2006 Chris Leishman.  All Rights Reserved.

This module is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND,
either expressed or implied. This program is free software; you can
redistribute or modify it under the same terms as Perl itself.

$Id: Memory.pm,v 1.9 2006/01/31 15:23:58 caleishm Exp $

=cut