Docs For Class Zend_Cache_Backend

Zend_Cache_Backend_TwoLevels

Description

Implements interfaces:

Zend_Cache_Backend_ExtendedInterface

copyright: Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
license: New BSD License

Located in /Cache/Backend/TwoLevels.php (line 42)

Zend_Cache_Backend
   |
   --Zend_Cache_Backend_TwoLevels

Variable Summary

Zend_Cache_Backend $_fastBackend

int $_fastBackendFillingPercentage

array $_options

Zend_Cache_Backend $_slowBackend

Method Summary

void __construct ([ $options = array()])

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

array getCapabilities ()

int getFillingPercentage ()

array getIds ()

array getIdsMatchingAnyTags ([array $tags = array()])

array getIdsMatchingTags ([array $tags = array()])

array getIdsNotMatchingTags ([array $tags = array()])

array getMetadatas (string $id)

array getTags ()

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

boolean remove (string $id)

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

mixed|false test (string $id)

boolean touch (string $id, int $extraLifetime)

void ___expire (string $id)

Variables

Zend_Cache_Backend $_fastBackend (line 105)

Fast Backend

access: protected

int $_fastBackendFillingPercentage = null (line 112)

Cache for the fast backend filling percentage

access: protected

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) (line 80)

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

var: available options
access: protected

Redefinition of:

Zend_Cache_Backend::$_options: Available options

Zend_Cache_Backend $_slowBackend (line 98)

Slow Backend

access: protected

Inherited Variables

Inherited from Zend_Cache_Backend

Zend_Cache_Backend::$_directives

Methods

Constructor __construct (line 121)

Constructor

throws: Zend_Cache_Exception
access: public

void __construct ([ $options = array()])

array $options: Associative array of options

Redefinition of:

Zend_Cache_Backend::__construct(): Constructor

clean (line 279)

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)

return: true if no problem
throws: Zend_Cache_Exception
access: public

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

string $mode: Clean mode
array $tags: Array of tags

Implementation of:

Zend_Cache_Backend_Interface::clean(): Clean some cache records

getCapabilities (line 434)

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)

return: associative of with capabilities
access: public

array getCapabilities ()

Implementation of:

Zend_Cache_Backend_ExtendedInterface::getCapabilities(): Return an associative array of capabilities (booleans) of the backend

getFillingPercentage (line 387)

Return the filling percentage of the backend storage

return: integer between 0 and 100
access: public

int getFillingPercentage ()

Implementation of:

Zend_Cache_Backend_ExtendedInterface::getFillingPercentage(): Return the filling percentage of the backend storage

getIds (line 327)

Return an array of stored cache ids

return: array of stored cache ids (string)
access: public

array getIds ()

Implementation of:

Zend_Cache_Backend_ExtendedInterface::getIds(): Return an array of stored cache ids

getIdsMatchingAnyTags (line 376)

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

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

return: array of any matching cache ids (string)
access: public

array getIdsMatchingAnyTags ([array $tags = array()])

array $tags: array of tags

Implementation of:

Zend_Cache_Backend_ExtendedInterface::getIdsMatchingAnyTags(): Return an array of stored cache ids which match any given tags

getIdsMatchingTags (line 350)

Return an array of stored cache ids which match given tags

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

return: array of matching cache ids (string)
access: public

array getIdsMatchingTags ([array $tags = array()])

array $tags: array of tags

Implementation of:

Zend_Cache_Backend_ExtendedInterface::getIdsMatchingTags(): Return an array of stored cache ids which match given tags

getIdsNotMatchingTags (line 363)

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

return: array of not matching cache ids (string)
access: public

array getIdsNotMatchingTags ([array $tags = array()])

array $tags: array of tags

Implementation of:

Zend_Cache_Backend_ExtendedInterface::getIdsNotMatchingTags(): Return an array of stored cache ids which don't match given tags

getMetadatas (line 403)

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

return: array of metadatas (false if the cache id is not found)
access: public

array getMetadatas (string $id)

string $id: cache id

Implementation of:

Zend_Cache_Backend_ExtendedInterface::getMetadatas(): Return an array of metadatas for the given cache id

getTags (line 337)

Return an array of stored tags

return: array of stored tags (string)
access: public

array getTags ()

Implementation of:

Zend_Cache_Backend_ExtendedInterface::getTags(): Return an array of stored tags

load (line 219)

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)

return: cached datas
access: public

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

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

Implementation of:

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

remove (line 254)

Remove a cache record

return: True if no problem
access: public

boolean remove (string $id)

string $id: Cache id

Implementation of:

Zend_Cache_Backend_Interface::remove(): Remove a cache record

save (line 190)

Save some string datas into a cache record

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

return: true if no problem
access: public

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

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

Implementation of:

Zend_Cache_Backend_Interface::save(): Save some string datas into a cache record

test (line 167)

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

return: (a cache is not available) or "last modified" timestamp (int) of the available cache record
access: public

mixed|false test (string $id)

string $id: cache id

Implementation of:

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

touch (line 415)

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

return: true if ok
access: public

boolean touch (string $id, int $extraLifetime)

string $id: cache id
int $extraLifetime

Implementation of:

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

___expire (line 501)

PUBLIC METHOD FOR UNIT TESTING ONLY !

Force a cache record to expire

access: public

void ___expire (string $id)

string $id: cache id

Inherited Methods

Inherited From Zend_Cache_Backend

Zend_Cache_Backend::__construct()
Zend_Cache_Backend::getLifetime()
Zend_Cache_Backend::getTmpDir()
Zend_Cache_Backend::isAutomaticCleaningAvailable()
Zend_Cache_Backend::setDirectives()
Zend_Cache_Backend::setOption()
Zend_Cache_Backend::_isGoodTmpDir()
Zend_Cache_Backend::_log()
Zend_Cache_Backend::_loggerSanity()

Documentation generated on Mon, 21 Jun 2010 15:50:11 -0400 by phpDocumentor 1.4.3