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 implementa-
tions. 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 con-
structed.
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 v5.8.8 2003-04-15 Cache::BaseCache(3)
