Cache::BaseCache(3) User Contributed Perl Documentation Cache::BaseCache(3)NAMECache::BaseCache-- abstract cache base class
DESCRIPTION
BaseCache provides functionality common to all instances of a cache.
It differes from the CacheUtils package insofar as it is designed to be
used as superclass for cache implementations.
SYNOPSISCache::BaseCache is to be used as a superclass for cache
implementations. The most effective way to use BaseCache is to use the
protected _set_backend method, which will be used to retrieve the
persistance mechanism. The subclass can then inherit the BaseCache's
implentation of get, set, etc. However, due to the difficulty
inheriting static methods in Perl, the subclass will likely need to
explicitly implement Clear, Purge, and Size. Also, a factory pattern
should be used to invoke the _complete_initialization routine after the
object is constructed.
package Cache::MyCache;
use vars qw( @ISA );
use Cache::BaseCache;
use Cache::MyBackend;
@ISA = qw( Cache::BaseCache );
sub new
{
my ( $self ) = _new( @_ );
$self->_complete_initialization( );
return $self;
}
sub _new
{
my ( $proto, $p_options_hash_ref ) = @_;
my $class = ref( $proto ) || $proto;
my $self = $class->SUPER::_new( $p_options_hash_ref );
$self->_set_backend( new Cache::MyBackend( ) );
return $self;
}
sub Clear
{
foreach my $namespace ( _Namespaces( ) )
{
_Get_Backend( )->delete_namespace( $namespace );
}
}
sub Purge
{
foreach my $namespace ( _Namespaces( ) )
{
_Get_Cache( $namespace )->purge( );
}
}
sub Size
{
my $size = 0;
foreach my $namespace ( _Namespaces( ) )
{
$size += _Get_Cache( $namespace )->size( );
}
return $size;
}
SEE ALSO
Cache::Cache, Cache::FileCache, Cache::MemoryCache
AUTHOR
Original author: DeWitt Clinton <dewitt@unto.net>
Last author: $Author: dclinton $
Copyright (C) 2001-2003 DeWitt Clinton
perl v5.14.1 2009-03-01 Cache::BaseCache(3)