Cache/Backend/TwoLevels.php

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Category: Zend
Copyright: Copyright (c) 2005-2014 Zend Technologies USA Inc. (http://www.zend.com)
License: New BSD License
Package: Zend_Cache
Subpackage: Zend_Cache_Backend
Version: $Id$

\Zend_Cache_Backend_TwoLevels
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Package: Zend_Cache\Zend_Cache_Backend

Implements
Parent(s): \Zend_Cache_Backend
Copyright: Copyright (c) 2005-2014 Zend Technologies USA Inc. (http://www.zend.com)
License: New BSD License

Properties

\Zend_Cache_Backend_ExtendedInterface $_fastBackend

Fast Backend

Details

Type: \Zend_Cache_Backend_ExtendedInterface

int $_fastBackendFillingPercentage = null

Cache for the fast backend filling percentage

Default valuenullDetails

Type: int

array $_options = array('slow_backend' => 'File', 'fast_backend' => 'Apc', 'slow_backend_options' => array(), 'fast_backend_options' => array(), 'stats_update_factor' => 10, 'slow_backend_custom_naming' => false, 'fast_backend_custom_naming' => false, 'slow_backend_autoload' => false, 'fast_backend_autoload' => false, 'auto_refresh_fast_cache' => true)

Available options

=====> (string) slow_backend : - Slow backend name - Must implement the Zend_Cache_Backend_ExtendedInterface - Should provide a big storage =====> (string) fast_backend : - Flow backend name - Must implement the Zend_Cache_Backend_ExtendedInterface - Must be much faster than slow_backend =====> (array) slow_backend_options : - Slow backend options (see corresponding backend) =====> (array) fast_backend_options : - Fast backend options (see corresponding backend) =====> (int) stats_update_factor : - Disable / Tune the computation of the fast backend filling percentage - When saving a record into cache : 1 => systematic computation of the fast backend filling percentage x (integer) > 1 => computation of the fast backend filling percentage randomly 1 times on x cache write =====> (boolean) slow_backend_custom_naming : =====> (boolean) fast_backend_custom_naming : =====> (boolean) slow_backend_autoload : =====> (boolean) fast_backend_autoload : - See Zend_Cache::factory() method =====> (boolean) auto_refresh_fast_cache - If true, auto refresh the fast cache when a cache record is hit

Default value

array('slow_backend' => 'File', 'fast_backend' => 'Apc', 'slow_backend_options' => array(), 'fast_backend_options' => array(), 'stats_update_factor' => 10, 'slow_backend_custom_naming' => false, 'fast_backend_custom_naming' => false, 'slow_backend_autoload' => false, 'fast_backend_autoload' => false, 'auto_refresh_fast_cache' => true)

Details

Type: array

\Zend_Cache_Backend_ExtendedInterface $_slowBackend

Slow Backend

Details

Type: \Zend_Cache_Backend_ExtendedInterface

Methods

___expire(string $id) : void

PUBLIC METHOD FOR UNIT TESTING ONLY !

Force a cache record to expire

Parameters

Name	Type	Description
$id	string	cache id

__construct(array $options = array()) : void

Constructor

Parameters

Name	Type	Description
$options	array	Associative array of options

Throws

Exception	Description
\Zend_Cache_Exception

_getFastFillingPercentage( $mode) : void

Parameters

Name	Type	Description
$mode

_getFastLifetime(int $lifetime, int $priority, int $maxLifetime = null) : int

Compute and return the lifetime for the fast backend

Parameters

Name	Type	Description
$lifetime	int	original lifetime
$priority	int	priority
$maxLifetime	int	maximum lifetime

Returns

Type	Description
int	lifetime for the fast backend

_prepareData(string $data, int $lifetime, int $priority) : string

Prepare a serialized array to store datas and metadatas informations

Parameters

Name	Type	Description
$data	string	data to store
$lifetime	int	original lifetime
$priority	int	priority

Returns

Type	Description
string	serialize array to store into cache

clean(string $mode = \Zend_Cache::CLEANING_MODE_ALL, array $tags = array()) : boolean

Clean some cache records

Available modes are : Zend_Cache::CLEANING_MODE_ALL (default) => remove all cache entries ($tags is not used) Zend_Cache::CLEANING_MODE_OLD => remove too old cache entries ($tags is not used) Zend_Cache::CLEANING_MODE_MATCHING_TAG => remove cache entries matching all given tags ($tags can be an array of strings or a single string) Zend_Cache::CLEANING_MODE_NOT_MATCHING_TAG => remove cache entries not {matching one of the given tags} ($tags can be an array of strings or a single string) Zend_Cache::CLEANING_MODE_MATCHING_ANY_TAG => remove cache entries matching any given tags ($tags can be an array of strings or a single string)

Parameters

Name	Type	Description
$mode	string	Clean mode
$tags	array	Array of tags

Returns

Type	Description
boolean	true if no problem

Throws

Exception	Description
\Zend_Cache_Exception

getCapabilities() : array

Return an associative array of capabilities (booleans) of the backend

The array must include these keys : - automatic_cleaning (is automating cleaning necessary) - tags (are tags supported) - expired_read (is it possible to read expired cache records (for doNotTestCacheValidity option for example)) - priority does the backend deal with priority when saving - infinite_lifetime (is infinite lifetime can work with this backend) - get_list (is it possible to get the list of cache ids and the complete list of tags)

Returns

Type	Description
array	associative of with capabilities

getFillingPercentage() : int

Return the filling percentage of the backend storage

Returns

Type	Description
int	integer between 0 and 100

getIds() : array

Return an array of stored cache ids

Returns

Type	Description
array	array of stored cache ids (string)

getIdsMatchingAnyTags(array $tags = array()) : array

Return an array of stored cache ids which match any given tags

In case of multiple tags, a logical AND is made between tags

Parameters

Name	Type	Description
$tags	array	array of tags

Returns

Type	Description
array	array of any matching cache ids (string)

getIdsMatchingTags(array $tags = array()) : array

Return an array of stored cache ids which match given tags

In case of multiple tags, a logical AND is made between tags

Parameters

Name	Type	Description
$tags	array	array of tags

Returns

Type	Description
array	array of matching cache ids (string)

getIdsNotMatchingTags(array $tags = array()) : array

Return an array of stored cache ids which don't match given tags

In case of multiple tags, a logical OR is made between tags

Parameters

Name	Type	Description
$tags	array	array of tags

Returns

Type	Description
array	array of not matching cache ids (string)

getMetadatas(string $id) : array

Return an array of metadatas for the given cache id

The array must include these keys : - expire : the expire timestamp - tags : a string array of tags - mtime : timestamp of last modification time

Parameters

Name	Type	Description
$id	string	cache id

Returns

Type	Description
array	array of metadatas (false if the cache id is not found)

getTags() : array

Return an array of stored tags

Returns

Type	Description
array	array of stored tags (string)

load(string $id, boolean $doNotTestCacheValidity = false) : string | false

Test if a cache is available for the given id and (if yes) return it (false else)

Note : return value is always "string" (unserialization is done by the core not by the backend)

Parameters

Name	Type	Description
$id	string	Cache id
$doNotTestCacheValidity	boolean	If set to true, the cache validity won't be tested

Returns

Type	Description
string \| false	cached datas

remove(string $id) : boolean

Remove a cache record

Parameters

Name	Type	Description
$id	string	Cache id

Returns

Type	Description
boolean	True if no problem

save(string $data, string $id, array $tags = array(), int $specificLifetime = false, int $priority = 8) : boolean

Save some string datas into a cache record

Note : $data is always "string" (serialization is done by the core not by the backend)

Parameters

Name	Type	Description
$data	string	Datas to cache
$id	string	Cache id
$tags	array	Array of strings, the cache record will be tagged by each string entry
$specificLifetime	int	If != false, set a specific lifetime for this cache record (null => infinite lifetime)
$priority	int	integer between 0 (very low priority) and 10 (maximum priority) used by some particular backends

Returns

Type	Description
boolean	true if no problem

test(string $id) : mixed | false

Test if a cache is available or not (for the given id)

Parameters

Name	Type	Description
$id	string	cache id

Returns

Type	Description
mixed \| false	(a cache is not available) or "last modified" timestamp (int) of the available cache record

touch(string $id, int $extraLifetime) : boolean

Give (if possible) an extra lifetime to the given cache id

Parameters

Name	Type	Description
$id	string	cache id
$extraLifetime	int

Returns

Type	Description
boolean	true if ok

Cache/Backend/TwoLevels.php

\Zend_Cache_Backend_TwoLevelsjump to top

Properties

Methods

\Zend_Cache_Backend_TwoLevels
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