Cache::CacheMetaData(3User Contributed Perl DocumentatiCache::CacheMetaData(3)NAMECache::CacheMetaData-- data about objects in the cache
DESCRIPTION
The CacheMetaData object is used by size aware caches to keep track of
the state of the cache and effeciently return information such as an
objects size or an ordered list of indentifiers to be removed when a
cache size is being limited. End users will not normally use
CacheMetaData directly.
SYNOPSIS
use Cache::CacheMetaData;
my $cache_meta_data = new Cache::CacheMetaData( );
foreach my $key ( $cache->get_keys( ) )
{
my $object = $cache->get_object( $key ) or
next;
$cache_meta_data->insert( $object );
}
my $current_size = $cache_meta_data->get_cache_size( );
my @removal_list = $cache_meta_data->build_removal_list( );
METHODS
new( )
Construct a new Cache::CacheMetaData object
insert( $object )
Inform the CacheMetaData about the object $object in the cache.
remove( $key )
Inform the CacheMetaData that the object specified by $key is no
longer in the cache.
build_removal_list( )
Create a list of the keys in the cache, ordered as follows:
1) objects that expire now
2) objects expiring at a particular time, with ties broken by the
time at which they were least recently accessed
3) objects that never expire, sub ordered by the time at which they
were least recently accessed
NOTE: This could be improved further by taking the size into
account on accessed_at ties. However, this type of tie is unlikely
in normal usage.
build_object_size( $key )
Return the size of an object specified by $key.
PROPERTIES
get_cache_size
The total size of the objects in the cache
SEE ALSO
Cache::Cache, Cache::CacheSizer, Cache::SizeAwareCache
AUTHOR
Original author: DeWitt Clinton <dewitt@unto.net>
Last author: $Author: dclinton $
Copyright (C) 2001-2003 DeWitt Clinton
perl v5.18.2 2009-03-01 Cache::CacheMetaData(3)
