NAME
Data::ObjectDriver::Driver::BaseCache - parent class for caching object drivers
SYNOPSIS
DESCRIPTION
Data::ObjectDriver::Driver::BaseCache provides behavior utilized for all caching object drivers for use with Data::ObjectDriver. That behavior is looking up requested objects in a cache, and falling back to another Data::ObjectDriver for a cache miss.
USAGE
Drivers based on Data::ObjectDriver::Driver::BaseCache support all standard operations for Data::ObjectDriver object drivers (lookup, search, update, insert, replace, remove, and fetch_data). BaseCache-derived drivers also support:
Data::ObjectDriver::Driver::BaseCache->new( %params )
Creates a new instance of a BaseCache driver. Required members of %params
are:
cache
The object with which to interface with the external cache. For example, for the
Memcached
caching object driver, the value of thecache
member should be aCache::Memcached
object.fallback
The
Data::ObjectDriver
object driver to which to fall back when the cache does not yet contain a requested object. Thefallback
member is also the object driver to which updates and inserts are passed.
$driver->cache_key($class, $primary_key)
Returns the cache key for an object of the given class with the given primary key. The cache key is used with the external cache to identify an object.
In BaseCache's implementation, the key is the class name and all the column names of the primary key concatenated, separated by single colons.
$driver->get_multi_from_cache(@cache_keys)
Returns the objects corresponding to the given cache keys, as represented in the external cache.
Data::ObjectDriver::Driver::BaseClass->Disabled([ $value ])
Returns whether caches of the given class are disabled, first updating the disabled state of drivers of the given class to $value
, if given. When a caching driver is disabled, all operations are automatically passed through to the fallback object driver.
Note that, if you disable and reenable a caching driver, some of the cached data may be invalid due to updates that were performed while the driver was disabled not being reflected in the external cache.
SUBCLASSING
When creating a caching driver from BaseCache
, the behavior for interaction with the external cache (through the cache
member of the constructor) must be defined by implementing these methods:
$driver->add_to_cache($cache_key, $obj_repr)
Sets the cache entry for $cache_key
to the given object representation. This method is used when the corresponding object is being saved to the database for the first time.
$driver->update_cache($cache_key, $obj_repr)
Sets the cache entry for $cache_key
to the given object representation. This method is used when the corresponding object already exists in the database and is being saved.
$driver->remove_from_cache($cache_key)
Clears the given cache entry. This method is used when the corresponding object is being deleted from the database.
$driver->get_from_cache($cache_key)
Returns the object corresponding to the given cache key, as it exists in the external cache.
$driver->inflate($class, $obj_repr)
Returns an instance of $class
containing the data in the representation $obj_repr
, as returned from the get_from_cache
method.
In BaseCache's implementation, no operation is performed. get_from_cache
should itself return the appropriate instances of Data::ObjectDriver::BaseObject
.
$driver->deflate($obj)
Returns a representation of the given Data::ObjectDriver::BaseObject
instance, suitable for passing to the add_to_cache
and update_cache
methods.
In BaseCache's implementation, no operation is performed. add_to_cache
and update_cache
should themselves accept Data::ObjectDriver::BaseObject
instances.
LICENSE
Data::ObjectDriver is free software; you may redistribute it and/or modify it under the same terms as Perl itself.
AUTHOR & COPYRIGHT
Except where otherwise noted, Data::ObjectDriver is Copyright 2005-2006 Six Apart, cpan@sixapart.com. All rights reserved.