cache::ref::clock(3pm) [debian man page]

Cache::Ref::CLOCK(3pm)					User Contributed Perl Documentation				    Cache::Ref::CLOCK(3pm)

NAME

       Cache::Ref::CLOCK - CLOCK cache replacement algorithm

SYNOPSIS

	   my $c = Cache::Ref::CLOCK->new(
	       size => $n,
	       k    => $k,
	   );

DESCRIPTION

       This algorithm is provides a second chance FIFO cache expiry policy using a circular buffer.

       It is a very well accepted page replacement algorithm, but largely for reasons which are irrelevant in this context (cache hits don't need
       to be serialized in a multiprocessing context as they only require an idempotent operation (setting a bit to 1)).

ATTRIBUTES

       size
	   The size of the live entries.

       k   This is the initial value given to all hit entries.

	   As the hand moves through the circular buffer it decrements the counters.

	   The default is 1, providing semantics similar to a second chance FIFO cache.

	   Larger values of "k" model LRU more accurately.

	   This is pretty silly though, as Cache::Ref::LRU is probably way more efficient for any "k" bigger than 1.

AUTHOR

       Yuval Kogman

COPYRIGHT AND LICENSE

       This software is copyright (c) 2010 by Yuval Kogman.

       This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

perl v5.12.4							    2010-09-23						    Cache::Ref::CLOCK(3pm)

Cache::Null(3pm)					User Contributed Perl Documentation					  Cache::Null(3pm)

NAME

       Cache::Null - Null implementation of the Cache interface

SYNOPSIS

	 use Cache::Null;

	 my $cache = Cache::Null->new();

       See Cache for the usage synopsis.

DESCRIPTION

       The Cache::Null class implements the Cache interface, but does not actually persist data.  This is useful when developing and debugging a
       system and you wish to easily turn off caching.	As a result, all calls return results indicating that there is no data stored.

CONSTRUCTOR

	 my $cache = Cache::Null->new( %options )

       The constructor takes cache properties as named arguments, for example:

	 my $cache = Cache::Null->new( default_expires => '600 sec' );

       See 'PROPERTIES' below and in the Cache documentation for a list of all available properties that can be set.  However it should be noted
       that all the existing properties, such as default_expires, have no effect in a Null cache.

METHODS

       See 'Cache' for the API documentation.

SEE ALSO

       Cache

AUTHOR

	Chris Leishman <chris@leishman.org>
	Based on work by DeWitt Clinton <dewitt@unto.net>

COPYRIGHT

	Copyright (C) 2003-2006 Chris Leishman.  All Rights Reserved.

       This module is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either expressed or implied. This program is free software;
       you can redistribute or modify it under the same terms as Perl itself.

       $Id: Null.pm,v 1.4 2006/01/31 15:23:58 caleishm Exp $

perl v5.12.4							    2011-08-05							  Cache::Null(3pm)