Кэширование с помощью eaccelerator

Не секрет, что популярный фреймворк Zend Framework не поддерживает кеширование через eAccelerator. Я решил исправить это и написал backend eAccelerator для ZF.
Напомню, что eAccelerator, помимо автоматического кеширования, поддерживает пользовательское. Как его использовать, можно найти в официальном мануале.

< ?php
/**
* @author Aco <aco dot best at gmail dot com> | WebITeam
*/

/**
* @see Zend_Cache_Backend_Interface
*/
require_once 'Zend/Cache/Backend/ExtendedInterface.php';

/**
* @see Zend_Cache_Backend
*/
require_once 'Zend/Cache/Backend.php';

/**
* @package Zend_Cache
* @subpackage Zend_Cache_Backend
*/
class Zend_Cache_Backend_Eaccelerator extends Zend_Cache_Backend implements Zend_Cache_Backend_ExtendedInterface
{
/**
* Log message
*/
const TAGS_UNSUPPORTED_BY_CLEAN_OF_EA_BACKEND = 'Zend_Cache_Backend_Eaccelerator::clean() : tags are unsupported by the eaccelerator backend';
const
TAGS_UNSUPPORTED_BY_SAVE_OF_EA_BACKEND = 'Zend_Cache_Backend_Eaccelerator::save() : tags are unsupported by the eaccelerator backend';

protected
$_options = array();

public function
__construct(array $options = array())
{
if (!
extension_loaded('eaccelerator'))
{
Zend_Cache::throwException('The eaccelerator extension must be loaded for using this backend !');
}
$funcs = get_extension_funcs('eaccelerator');
if(!
in_array("eaccelerator_get",$funcs) || !in_array("eaccelerator_put",$funcs))
{
Zend_Cache::throwException('The eaccelerator extension must be loaded completely for using this backend !');
}
parent::__construct($options);
}
/**
* Save some string datas into a cache record
*
* Note : $data is always "string" (serialization is done by the
* core not by the backend)
*
* @param string $data datas to cache
* @param string $id cache id
* @param array $tags array of strings, the cache record will be tagged by each string entry
* @param int $specificLifetime if != false, set a specific lifetime for this cache record (null => infinite lifetime)
* @return boolean true if no problem
*/
public function save($data, $id, $tags = array(), $specificLifetime = false)
{
$lifetime = $this->getLifetime($specificLifetime);
if (
count($tags) > 0)
{
$this->_log(self::TAGS_UNSUPPORTED_BY_SAVE_OF_EA_BACKEND);
}
return
eaccelerator_put($id, $data, $lifetime);
}
/**
* Test if a cache is available for the given id and (if yes) return it (false else)
*
* WARNING $doNotTestCacheValidity=true is unsupported by the Eaccelerator backend
*
* @param string $id cache id
* @param boolean $doNotTestCacheValidity if set to true, the cache validity won't be tested
* @return string cached datas (or false)
*/
public function load($id, $doNotTestCacheValidity = false)
{
return
eaccelerator_get($id);
}

public function
test($id)
{
$tmp = eaccelerator_get($id);
if (
$tmp) {
return
$tmp;
}
return
false;
}

/**
* Remove a cache record
*
* @param string $id cache id
* @return boolean true if no problem
*/
public function remove($id)
{
return
eaccelerator_rm($id);
}

/**
* 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
*
* @param string $mode clean mode
* @param array $tags array of tags
* @throws Zend_Cache_Exception
* @return boolean true if no problem
*/
public function clean($mode = Zend_Cache::CLEANING_MODE_ALL, $tags = array())
{
switch (
$mode)
{
case
Zend_Cache::CLEANING_MODE_ALL:
return
eaccelerator_clear() && eaccelerator_clean();
break;
case
Zend_Cache::CLEANING_MODE_OLD:
return
eaccelerator_gc();
break;
case
Zend_Cache::CLEANING_MODE_MATCHING_TAG:
case
Zend_Cache::CLEANING_MODE_NOT_MATCHING_TAG:
case
Zend_Cache::CLEANING_MODE_MATCHING_ANY_TAG:
$this->_log(self::TAGS_UNSUPPORTED_BY_CLEAN_OF_EA_BACKEND);
break;
default:
Zend_Cache::throwException('Invalid mode for clean() method');
break;
}
}

/**
* Return true if the automatic cleaning is available for the backend
*
* DEPRECATED : use getCapabilities() instead
*
* @deprecated
* @return boolean
*/
public function isAutomaticCleaningAvailable()
{
return
false;
}

/**
* Return the filling percentage of the backend storage
*
* @throws Zend_Cache_Exception
* @return int integer between 0 and 100
*/
public function getFillingPercentage()
{
$eaInfo = eaccelerator_info();
if (
$eaInfo["memorySize"] == 0) {
Zend_Cache::throwException("can't get eaccelerator memory size");
}
if (
$eaInfo["memoryAllocated"] > $eaInfo["memorySize"]) {
return
100;
}
return ((int) (
100. * ($eaInfo["memoryAllocated"] / $eaInfo["memorySize"])));
}

/**
* Return an array of stored tags
*
* @return array array of stored tags (string)
*/
public function getTags()
{
$this->_log(self::TAGS_UNSUPPORTED_BY_SAVE_OF_EA_BACKEND);
return array();
}

/**
* Return an array of stored cache ids which match given tags
*
* In case of multiple tags, a logical AND is made between tags
*
* @param array $tags array of tags
* @return array array of matching cache ids (string)
*/
public function getIdsMatchingTags($tags = array())
{
$this->_log(self::TAGS_UNSUPPORTED_BY_SAVE_OF_EA_BACKEND);
return 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
*
* @param array $tags array of tags
* @return array array of not matching cache ids (string)
*/
public function getIdsNotMatchingTags($tags = array())
{
$this->_log(self::TAGS_UNSUPPORTED_BY_SAVE_OF_EA_BACKEND);
return 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
*
* @param array $tags array of tags
* @return array array of any matching cache ids (string)
*/
public function getIdsMatchingAnyTags($tags = array())
{
$this->_log(self::TAGS_UNSUPPORTED_BY_SAVE_OF_EA_BACKEND);
return array();
}

/**
* Return an array of stored cache ids
*
* @return array array of stored cache ids (string)
*/
public function getIds()
{
return
eaccelerator_list_keys();
}

/**
* 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
*
* @param string $id cache id
* @return array array of metadatas (false if the cache id is not found)
*/
public function getMetadatas($id)
{
return
false;
}

/**
* Give (if possible) an extra lifetime to the given cache id
*
* @param string $id cache id
* @param int $extraLifetime
* @return boolean true if ok
*/
public function touch($id, $extraLifetime)
{

$tmp = eaccelerator_get($id);
if (
$tmp !== null)
{
eaccelerator_put($id, $tmp, $extraLifetime);
return
true;
}
return
false;
}

/**
* 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 array associative of with capabilities
*/
public function getCapabilities()
{
return array(
'automatic_cleaning' => false,
'tags' => false,
'expired_read' => false,
'priority' => false,
'infinite_lifetime' => false,
'get_list' => true
);
}
}
?>

Взято с http://www.internet-technologies.ru/articles/article_1428.html


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