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package DBI::Util::CacheMemory;
# $Id: CacheMemory.pm 10314 2007-11-26 22:25:33Z Tim $
#
# Copyright (c) 2007, Tim Bunce, Ireland
#
# You may distribute under the terms of either the GNU General Public
# License or the Artistic License, as specified in the Perl README file.
use strict;
use warnings;
=head1 NAME
DBI::Util::CacheMemory - a very fast but very minimal subset of Cache::Memory
=head1 DESCRIPTION
Like Cache::Memory (part of the Cache distribution) but doesn't support any fancy features.
This module aims to be a very fast compatible strict sub-set for simple cases,
such as basic client-side caching for DBD::Gofer.
Like Cache::Memory, and other caches in the Cache and Cache::Cache
distributions, the data will remain in the cache until cleared, it expires,
or the process dies. The cache object simply going out of scope will I<not>
destroy the data.
=head1 METHODS WITH CHANGES
=head2 new
All options except C<namespace> are ignored.
=head2 set
Doesn't support expiry.
=head2 purge
Same as clear() - deletes everything in the namespace.
=head1 METHODS WITHOUT CHANGES
=over
=item clear
=item count
=item exists
=item remove
=back
=head1 UNSUPPORTED METHODS
If it's not listed above, it's not supported.
=cut
our $VERSION = "0.010315";
my %cache;
sub new {
my ($class, %options ) = @_;
my $namespace = $options{namespace} ||= 'Default';
#$options{_cache} = \%cache; # can be handy for debugging/dumping
my $self = bless \%options => $class;
$cache{ $namespace } ||= {}; # init - ensure it exists
return $self;
}
sub set {
my ($self, $key, $value) = @_;
$cache{ $self->{namespace} }->{$key} = $value;
}
sub get {
my ($self, $key) = @_;
return $cache{ $self->{namespace} }->{$key};
}
sub exists {
my ($self, $key) = @_;
return exists $cache{ $self->{namespace} }->{$key};
}
sub remove {
my ($self, $key) = @_;
return delete $cache{ $self->{namespace} }->{$key};
}
sub purge {
return shift->clear;
}
sub clear {
$cache{ shift->{namespace} } = {};
}
sub count {
return scalar keys %{ $cache{ shift->{namespace} } };
}
sub size {
my $c = $cache{ shift->{namespace} };
my $size = 0;
while ( my ($k,$v) = each %$c ) {
$size += length($k) + length($v);
}
return $size;
}
1;
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