API Documentation

Zend/Cache/Backend/Memcached.php

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Zend Framework

LICENSE

This source file is subject to the new BSD license that is bundled with this package in the file LICENSE.txt. It is also available through the world-wide-web at this URL: http://framework.zend.com/license/new-bsd If you did not receive a copy of the license and are unable to obtain it through the world-wide-web, please send an email to license@zend.com so we can send you a copy immediately.

Category
Zend  
Copyright
Copyright (c) 2005-2012 Zend Technologies USA Inc. (http://www.zend.com)  
License
New BSD License  
Package
Zend_Cache  
Subpackage
Zend_Cache_Backend  
Version
$Id: Memcached.php 24594 2012-01-05 21:27:01Z matthew $  

\Zend_Cache_Backend_Memcached

Package: Zend\Cache\Zend\Cache\Backend

Implements
\Zend_Cache_Backend_ExtendedInterface
Parent(s)
\Zend_Cache_Backend
Copyright
Copyright (c) 2005-2012 Zend Technologies USA Inc. (http://www.zend.com)  
License
New BSD License  

Constants

Constant  DEFAULT_HOST = '127.0.0.1'

Default Values

Constant  DEFAULT_PORT = 11211
Constant  DEFAULT_PERSISTENT = true
Constant  DEFAULT_WEIGHT = 1
Constant  DEFAULT_TIMEOUT = 1
Constant  DEFAULT_RETRY_INTERVAL = 15
Constant  DEFAULT_STATUS = true
Constant  DEFAULT_FAILURE_CALLBACK = null
Constant  TAGS_UNSUPPORTED_BY_CLEAN_OF_MEMCACHED_BACKEND = 'Zend_Cache_Backend_Memcached::clean() : tags are unsupported by the Memcached backend'

Log message

Constant  TAGS_UNSUPPORTED_BY_SAVE_OF_MEMCACHED_BACKEND = 'Zend_Cache_Backend_Memcached::save() : tags are unsupported by the Memcached backend'

Properties

Propertyprotectedmixed  $_memcache= 'null'

Memcache object

memcache object
Default valuenullDetails
Type
mixed
Propertyprotectedarray  $_options= 'array( 'servers' => array(array( 'host' => self::DEFAULT_HOST'

Available options

available options

=====> (array) servers : an array of memcached server ; each memcached server is described by an associative array : 'host' => (string) : the name of the memcached server 'port' => (int) : the port of the memcached server 'persistent' => (bool) : use or not persistent connections to this memcached server 'weight' => (int) : number of buckets to create for this server which in turn control its probability of it being selected. The probability is relative to the total weight of all servers. 'timeout' => (int) : value in seconds which will be used for connecting to the daemon. Think twice before changing the default value of 1 second - you can lose all the advantages of caching if your connection is too slow. 'retry_interval' => (int) : controls how often a failed server will be retried, the default value is 15 seconds. Setting this parameter to -1 disables automatic retry. 'status' => (bool) : controls if the server should be flagged as online. 'failure_callback' => (callback) : Allows the user to specify a callback function to run upon encountering an error. The callback is run before failover is attempted. The function takes two parameters, the hostname and port of the failed server.

=====> (boolean) compression : true if you want to use on-the-fly compression

=====> (boolean) compatibility : true if you use old memcache server or extension

Default valuearray( 'servers' => array(array( 'host' => self::DEFAULT_HOSTDetails
Type
array

Methods

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

Constructor

Parameters
Name Type Description
$options array

associative array of options

Throws
Exception Description
\Zend_Cache_Exception
methodpublicclean( string $mode = Zend_Cache::CLEANING_MODE_ALL, array $tags = array() ) : boolean

Clean some cache records

Available modes are : 'all' (default) => remove all cache entries ($tags is not used) 'old' => unsupported 'matchingTag' => unsupported 'notMatchingTag' => unsupported 'matchingAnyTag' => unsupported

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
methodpublicgetCapabilities( ) : 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
methodpublicgetFillingPercentage( ) : int

Return the filling percentage of the backend storage

Returns
Type Description
int integer between 0 and 100
Throws
Exception Description
\Zend_Cache_Exception
methodpublicgetIds( ) : array

Return an array of stored cache ids

Returns
Type Description
array array 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 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)
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
Name Type Description
$tags array

array of tags

Returns
Type Description
array array 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
Name Type Description
$tags array

array of tags

Returns
Type Description
array array of not matching cache ids (string)
methodpublicgetMetadatas( 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)
methodpublicgetTags( ) : array

Return an array of stored tags

Returns
Type Description
array array of stored tags (string)
methodpublicisAutomaticCleaningAvailable( ) : boolean

Return true if the automatic cleaning is available for the backend

Returns
Type Description
boolean
methodpublicload( string $id, boolean $doNotTestCacheValidity = false ) : string|false

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

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
methodpublicremove( string $id ) : boolean

Remove a cache record

Parameters
Name Type Description
$id string

Cache id

Returns
Type Description
boolean True if no problem
methodpublicsave( string $data, string $id, array $tags = array(), int $specificLifetime = false ) : 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)

Returns
Type Description
boolean True if no problem
methodpublicsetDirectives( array $directives ) : void

Set the frontend directives

Parameters
Name Type Description
$directives array

Assoc of directives

Throws
Exception Description
\Zend_Cache_Exception
methodpublictest( 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
methodpublictouch( 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
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