Cache/Core.php

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Zend Framework
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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  
Version
$Id$  

\Zend_Cache_Core

Package: Zend_Cache
Children
\Zend_Cache_Frontend_Class
\Zend_Cache_Frontend_File
\Zend_Cache_Frontend_Capture
\Zend_Cache_Frontend_Page
\Zend_Cache_Frontend_Output
\Zend_Cache_Frontend_Function
Copyright
Copyright (c) 2005-2014 Zend Technologies USA Inc. (http://www.zend.com)  
License
New BSD License  

Constants

>VConstant  BACKEND_NOT_SUPPORTS_TAG = 'tags are not supported by the current backend'
Messages
>VConstant  BACKEND_NOT_IMPLEMENTS_EXTENDED_IF = 'Current backend doesn\'t implement the Zend_Cache_Backend_ExtendedInterface, so this method is not available'

Properties

>VPropertyprotected\Zend_Cache_Backend_Interface $_backend = null
Backend Object
Default valuenullDetails
Type
\Zend_Cache_Backend_Interface
>VPropertyprotectedarray $_backendCapabilities = array()
Array of capabilities of the backend (only if it implements Zend_Cache_Backend_ExtendedInterface)
Default valuearray()Details
Type
array
>VPropertyprotectedarray $_directivesList = array('lifetime', 'logging', 'logger')
static
Array of options which have to be transfered to backend
Default valuearray('lifetime', 'logging', 'logger')Details
Type
array
>VPropertyprotectedboolean $_extendedBackend = false
True if the backend implements Zend_Cache_Backend_ExtendedInterface
Default valuefalseDetails
Type
boolean
>VPropertyprivatestring $_lastId = null
Last used cache id
Default valuenullDetails
Type
string
>VPropertyprotectedarray $_options = array('write_control' => true, 'caching' => true, 'cache_id_prefix' => null, 'automatic_serialization' => false, 'automatic_cleaning_factor' => 10, 'lifetime' => 3600, 'logging' => false, 'logger' => null, 'ignore_user_abort' => false)
Available options
====> (boolean) write_control : - Enable / disable write control (the cache is read just after writing to detect corrupt entries) - Enable write control will lightly slow the cache writing but not the cache reading Write control can detect some corrupt cache files but maybe it's not a perfect control ====> (boolean) caching : - Enable / disable caching (can be very useful for the debug of cached scripts) =====> (string) cache_id_prefix : - prefix for cache ids (namespace) ====> (boolean) automatic_serialization : - Enable / disable automatic serialization - It can be used to save directly datas which aren't strings (but it's slower) ====> (int) automatic_cleaning_factor : - Disable / Tune the automatic cleaning process - The automatic cleaning process destroy too old (for the given life time) cache files when a new cache file is written : 0 => no automatic cache cleaning 1 => systematic cache cleaning x (integer) > 1 => automatic cleaning randomly 1 times on x cache write ====> (int) lifetime : - Cache lifetime (in seconds) - If null, the cache is valid forever. ====> (boolean) logging : - If set to true, logging is activated (but the system is slower) ====> (boolean) ignore_user_abort - If set to true, the core will set the ignore_user_abort PHP flag inside the save() method to avoid cache corruptions in some cases (default false)
Default valuearray('write_control' => true, 'caching' => true, 'cache_id_prefix' => null, 'automatic_serialization' => false, 'automatic_cleaning_factor' => 10, 'lifetime' => 3600, 'logging' => false, 'logger' => null, 'ignore_user_abort' => false)Details
Type
array
>VPropertyprotectedarray $_specificOptions = array()
Not used for the core, just a sort a hint to get a common setOption() method (for the core and for frontends)
Default valuearray()Details
Type
array

Methods

methodpublic__construct(array | \Zend_Config $options = array()) : void

Constructor

Parameters
NameTypeDescription
$optionsarray | \Zend_Config

Associative array of options or Zend_Config instance

Throws
ExceptionDescription
\Zend_Cache_Exception
methodprotected_id(string $id) : string

Make and return a cache id

Checks 'cache_id_prefix' and returns new id with prefix or simply the id if null
Parameters
NameTypeDescription
$idstring

Cache id

Returns
TypeDescription
stringCache id (with or without prefix)
methodprotected_log(string $message,  $priority = 4) : void

Log a message at the WARN (4) priority.

Parameters
NameTypeDescription
$messagestring
$priority
Throws
ExceptionDescription
\Zend_Cache_Exception
methodprotected_loggerSanity() : void

Make sure if we enable logging that the Zend_Log class is available.

Create a default log object if none is set.
Throws
ExceptionDescription
\Zend_Cache_Exception
methodprivate_setOption(string $name, mixed $value) : void

Set an option

Parameters
NameTypeDescription
$namestring

Name of the option

$valuemixed

Value of the option

Throws
ExceptionDescription
\Zend_Cache_Exception
methodprotected_validateIdOrTag(string $string) : void
static

Validate a cache id or a tag (security, reliable filenames, reserved prefixes.

..) Throw an exception if a problem is found
Parameters
NameTypeDescription
$stringstring

Cache id or tag

Throws
ExceptionDescription
\Zend_Cache_Exception
methodprotected_validateTagsArray(array $tags) : void
static

Validate a tags array (security, reliable filenames, reserved prefixes.

..) Throw an exception if a problem is found
Parameters
NameTypeDescription
$tagsarray

Array of tags

Throws
ExceptionDescription
\Zend_Cache_Exception
methodpublicclean(string $mode = 'all', array | string $tags = array()) : boolean

Clean cache entries

Available modes are : 'all' (default) => remove all cache entries ($tags is not used) 'old' => remove too old cache entries ($tags is not used) 'matchingTag' => remove cache entries matching all given tags ($tags can be an array of strings or a single string) 'notMatchingTag' => remove cache entries not matching one of the given tags ($tags can be an array of strings or a single string) 'matchingAnyTag' => remove cache entries matching any given tags ($tags can be an array of strings or a single string)
Parameters
NameTypeDescription
$modestring
$tagsarray | string
Returns
TypeDescription
booleanTrue if ok
Throws
ExceptionDescription
\Zend_Cache_Exception
methodpublicgetBackend() : \Zend_Cache_Backend

Returns the backend

Returns
TypeDescription
\Zend_Cache_Backendbackend object
methodpublicgetFillingPercentage() : int

Return the filling percentage of the backend storage

Returns
TypeDescription
intinteger between 0 and 100
methodpublicgetIds() : array

Return an array of stored cache ids

Returns
TypeDescription
arrayarray of stored cache ids (string)
methodpublicgetIdsMatchingAnyTags(array $tags = array()) : array

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

In case of multiple tags, a logical OR is made between tags
Parameters
NameTypeDescription
$tagsarray

array of tags

Returns
TypeDescription
arrayarray of matching any cache ids (string)
methodpublicgetIdsMatchingTags(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
NameTypeDescription
$tagsarray

array of tags

Returns
TypeDescription
arrayarray of matching cache ids (string)
methodpublicgetIdsNotMatchingTags(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
NameTypeDescription
$tagsarray

array of tags

Returns
TypeDescription
arrayarray of not matching cache ids (string)
methodpublicgetMetadatas(string $id) : array

Return an array of metadatas for the given cache id

The array will include these keys : - expire : the expire timestamp - tags : a string array of tags - mtime : timestamp of last modification time
Parameters
NameTypeDescription
$idstring

cache id

Returns
TypeDescription
arrayarray of metadatas (false if the cache id is not found)
methodpublicgetOption(string $name) : mixed

Public frontend to get an option value

Parameters
NameTypeDescription
$namestring

Name of the option

Returns
TypeDescription
mixedoption value
Throws
ExceptionDescription
\Zend_Cache_Exception
methodpublicgetTags() : array

Return an array of stored tags

Returns
TypeDescription
arrayarray of stored tags (string)
methodpublicload(string $id, boolean $doNotTestCacheValidity = false, boolean $doNotUnserialize = false) : mixed | false

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

Parameters
NameTypeDescription
$idstring

Cache id

$doNotTestCacheValidityboolean

If set to true, the cache validity won't be tested

$doNotUnserializeboolean

Do not serialize (even if automatic_serialization is true) => for internal use

Returns
TypeDescription
mixed | falseCached datas
methodpublicremove(string $id) : boolean

Remove a cache

Parameters
NameTypeDescription
$idstring

Cache id to remove

Returns
TypeDescription
booleanTrue if ok
methodpublicsave(mixed $data, string $id = null, array $tags = array(), int $specificLifetime = false, int $priority = 8) : boolean

Save some data in a cache

Parameters
NameTypeDescription
$datamixed

Data to put in cache (can be another type than string if automatic_serialization is on)

$idstring

Cache id (if not set, the last cache id will be used)

$tagsarray

Cache tags

$specificLifetimeint

If != false, set a specific lifetime for this cache record (null => infinite lifetime)

$priorityint

integer between 0 (very low priority) and 10 (maximum priority) used by some particular backends

Returns
TypeDescription
booleanTrue if no problem
Throws
ExceptionDescription
\Zend_Cache_Exception
methodpublicsetBackend(\Zend_Cache_Backend $backendObject) : void

Set the backend

Parameters
NameTypeDescription
$backendObject\Zend_Cache_Backend
Throws
ExceptionDescription
\Zend_Cache_Exception
methodpublicsetConfig(\Zend_Config $config) : \Zend_Cache_Core

Set options using an instance of type Zend_Config

Parameters
NameTypeDescription
$config\Zend_Config
Returns
TypeDescription
\Zend_Cache_Core
methodpublicsetLifetime(int $newLifetime) : void

Force a new lifetime

The new value is set for the core/frontend but for the backend too (directive)
Parameters
NameTypeDescription
$newLifetimeint

New lifetime (in seconds)

methodpublicsetOption(string $name, mixed $value) : void

Public frontend to set an option

There is an additional validation (relatively to the protected _setOption method)
Parameters
NameTypeDescription
$namestring

Name of the option

$valuemixed

Value of the option

Throws
ExceptionDescription
\Zend_Cache_Exception
methodpublictest(string $id) : int | false

Test if a cache is available for the given id

Parameters
NameTypeDescription
$idstring

Cache id

Returns
TypeDescription
int | falseLast modified time of cache entry if it is available, false otherwise
methodpublictouch(string $id, int $extraLifetime) : boolean

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

Parameters
NameTypeDescription
$idstring

cache id

$extraLifetimeint
Returns
TypeDescription
booleantrue if ok
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