/usr/share/perl5/Cache/SizeAwareCacheTester.pm is in libcache-cache-perl 1.06-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# $Id: SizeAwareCacheTester.pm,v 1.11 2002/04/07 17:04:46 dclinton Exp $
# Copyright (C) 2001-2003 DeWitt Clinton All Rights Reserved
#
# Software distributed under the License is distributed on an "AS
# IS" basis, WITHOUT WARRANTY OF ANY KIND, either expressed or
# implied. See the License for the specific language governing
# rights and limitations under the License.
######################################################################
package Cache::SizeAwareCacheTester;
use strict;
use Cache::BaseCacheTester;
use Cache::Cache;
use vars qw( @ISA );
@ISA = qw ( Cache::BaseCacheTester );
sub test
{
my ( $self, $cache ) = @_;
$self->_test_one( $cache );
$self->_test_two( $cache );
$self->_test_three( $cache );
}
# Test the limit_size( ) method, which should automatically purge the
# first object added (with the closer expiration time)
sub _test_one
{
my ( $self, $cache ) = @_;
$cache or
croak( "cache required" );
$cache->clear( );
my $empty_size = $cache->size( );
( $empty_size == 0 ) ?
$self->ok( ) : $self->not_ok( '$empty_size == 0' );
my $first_key = 'Key 1';
my $first_expires_in = '10';
my $value = $self;
$cache->set( $first_key, $value, $first_expires_in );
my $first_size = $cache->size( );
( $first_size > $empty_size ) ?
$self->ok( ) : $self->not_ok( '$first_size > $empty_size' );
my $size_limit = $first_size;
my $second_key = 'Key 2';
my $second_expires_in = $first_expires_in * 2;
$cache->set( $second_key, $value, $second_expires_in );
my $second_size = $cache->size( );
( $second_size > $first_size ) ?
$self->ok( ) : $self->not_ok( '$second_size > $first_size' );
$cache->limit_size( $size_limit );
my $first_value = $cache->get( $first_key );
( not defined $first_value ) ?
$self->ok( ) : $self->not_ok( 'not defined $first_value' );
my $third_size = $cache->size( );
( $third_size <= $size_limit ) ?
$self->ok( ) : $self->not_ok( '$third_size <= $size_limit' );
}
# Test the limit_size method when a number of objects can expire
# simultaneously
sub _test_two
{
my ( $self, $cache ) = @_;
$cache or
croak( "cache required" );
$cache->clear( );
my $empty_size = $cache->size( );
( $empty_size == 0 ) ?
$self->ok( ) : $self->not_ok( '$empty_size == 0' );
my $value = "A very short string";
my $first_key = 'Key 0';
my $first_expires_in = 20;
$cache->set( $first_key, $value, $first_expires_in );
my $first_size = $cache->size( );
( $first_size > $empty_size ) ?
$self->ok( ) : $self->not_ok( '$first_size > $empty_size' );
my $second_expires_in = $first_expires_in / 2;
my $num_keys = 5;
for ( my $i = 1; $i <= $num_keys; $i++ )
{
my $key = 'Key ' . $i;
sleep ( 1 );
$cache->set( $key, $value, $second_expires_in );
}
my $second_size = $cache->size( );
( $second_size > $first_size ) ?
$self->ok( ) : $self->not_ok( '$second_size > $first_size' );
my $size_limit = $first_size;
$cache->limit_size( $size_limit );
my $third_size = $cache->size( );
( $third_size <= $size_limit ) ?
$self->ok( ) : $self->not_ok( '$third_size <= $size_limit' );
my $first_value = $cache->get( $first_key );
( $first_value eq $value ) ?
$self->ok( ) : $self->not_ok( '$first_value eq $value' );
}
# Test the max_size( ) method, which should keep the cache under
# the given size
sub _test_three
{
my ( $self, $cache ) = @_;
$cache or
croak( "cache required" );
$cache->clear( );
my $empty_size = $cache->size( );
( $empty_size == 0 ) ?
$self->ok( ) : $self->not_ok( '$empty_size == 0' );
my $first_key = 'Key 1';
my $value = $self;
$cache->set( $first_key, $value );
my $first_size = $cache->size( );
( $first_size > $empty_size ) ?
$self->ok( ) : $self->not_ok( '$first_size > $empty_size' );
my $max_size = $first_size;
$cache->set_max_size( $max_size );
my $second_key = 'Key 2';
$cache->set( $second_key, $value );
my $second_size = $cache->size( );
( $second_size <= $max_size ) ?
$self->ok( ) : $self->not_ok( '$second_size <= $max_size' );
}
1;
__END__
=pod
=head1 NAME
Cache::SizeAwareCacheTester -- a class for regression testing size aware caches
=head1 DESCRIPTION
The SizeCacheTester is used to verify that a cache implementation honors
its contract with respect to resizing capabilities
=head1 SYNOPSIS
use Cache::SizeAwareMemoryCache;
use Cache::SizeAwareCacheTester;
my $cache = new Cache::SizeAwareMemoryCache( );
my $cache_tester = new Cache::SizeAwareCacheTester( 1 );
$cache_tester->test( $cache );
=head1 METHODS
=over
=item B<new( $initial_count )>
Construct a new SizeAwareCacheTester object, with the counter starting
at I<$initial_count>.
=item B<test( )>
Run the tests.
=back
=head1 SEE ALSO
Cache::Cache, Cache::BaseCacheTester, Cache::CacheTester
=head1 AUTHOR
Original author: DeWitt Clinton <dewitt@unto.net>
Last author: $Author: dclinton $
Copyright (C) 2001-2003 DeWitt Clinton
=cut
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