Cache::SizeAwareCache(3pm) User Contributed Perl Documentation Cache::SizeAwareCache(3pm)NAME
Cache::SizeAwareCache -- extends the Cache interface.
DESCRIPTION
The SizeAwareCache interface is implemented by classes that support all of the Cache::Cache interface in addition to the limit_size and
max_size features of a size aware cache.
The default cache size limiting algorithm works by removing cache objects in the following order until the desired limit is reached:
1) objects that have expired
2) objects that are least recently accessed
3) objects that that expire next
SYNOPSIS
use Cache::SizeAwareCache;
use vars qw( @ISA );
@ISA = qw( Cache::SizeAwareCache );
CONSTANTS
Please see Cache::Cache for standard constants
$NO_MAX_SIZE
The cache has no size restrictions
METHODS
Please see Cache::Cache for the standard methods
limit_size( $new_size )
Attempt to resize the cache such that the total disk usage is under the $new_size parameter. $new_size represents t size (in bytes)
that the cache should be limited to. Note that this is only a one time adjustment. To maintain the cache size, consider using the
max_size option, although it is considered very expensive, and can often be better achieved by peridocally calling limit_size.
OPTIONS
Please see Cache::Cache for the standard options
max_size
Sets the max_size property (size in bytes), which is described in detail below. Defaults to $NO_MAX_SIZE.
PROPERTIES
Please see Cache::Cache for standard properties
(get|set)_max_size
If this property is set, then the cache will try not to exceed the max size value (in bytes) specified. NOTE: This causes the size of
the cache to be checked on every set, and can be considered *very* expensive in some implementations. A good alternative approach is
leave max_size as $NO_MAX_SIZE and to periodically limit the size of the cache by calling the limit_size( $size ) method.
SEE ALSO
Cache::Cache
AUTHOR
Original author: DeWitt Clinton <dewitt@unto.net>
Last author: $Author: dclinton $
Copyright (C) 2001-2003 DeWitt Clinton
perl v5.12.4 2009-03-01 Cache::SizeAwareCache(3pm)
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HTML::Mason::Cache::BaseCache(3pm) User Contributed Perl Documentation HTML::Mason::Cache::BaseCache(3pm)NAME
HTML::Mason::Cache::BaseCache - Base cache object
DESCRIPTION
This is the base module for all cache implementations used in Mason. It provides a few additional methods on top of "Cache::BaseCache" in
Dewitt Clinton's "Cache::Cache" package.
An object of this class is returned from $m->cache.
METHODS
clear ()
Remove all values in the cache.
get (key, [%params])
Returns the value associated with key or undef if it is non-existent or expired. This is extended with the following optional
name/value parameters:
busy_lock => duration
If the value has expired, set its expiration time to the current time plus duration (instead of removing it from the cache) before
returning undef. This is used to prevent multiple processes from recomputing the same expensive value simultaneously. The duration
may be of any form acceptable to set.
expire_if => sub
If the value exists and has not expired, call sub with the cache object as a single parameter. If sub returns a true value, expire
the value.
get_object (key)
Returns the underlying "Cache::Object" object associated with key. The most useful methods on this object are
$co->get_created_at(); # when was object stored in cache
$co->get_accessed_at(); # when was object last accessed
$co->get_expires_at(); # when does object expire
expire (key)
Expires the value associated with key, if it exists. Differs from remove only in that the cache object is left around, e.g. for
retrieval by get_object.
remove (key)
Removes the cache object associated with key, if it exists.
set (key, data, [duration])
Associates data with key in the cache. duration indicates the time until the value should be erased. If duration is unspecified, the
value will never expire by time.
$expires_in may be a simple number of seconds, or a string of the form "[number] [unit]", e.g., "10 minutes". The valid units are s,
second, seconds, sec, m, minute, minutes, min, h, hour, hours, d, day, days, w, week, weeks, M, month, months, y, year, and years.
perl v5.14.2 2012-02-04 HTML::Mason::Cache::BaseCache(3pm)