Cache::SizeAwareCache -- extends the Cache interface.
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 expire next
use Cache::SizeAwareCache;
use vars qw( @ISA );
@ISA = qw( Cache::SizeAwareCache );
Please see Cache::Cache for standard constants
- $NO_MAX_SIZE
-
The cache has no size restrictions
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 periodically calling limit_size.
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.
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.
Cache::Cache
Original author: DeWitt Clinton <dewitt@unto.net>
Last author: $Author: dclinton $
Copyright (C) 2001-2003 DeWitt Clinton
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