Кэширование с помощью eaccelerator

< ?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
 );
 }
}
?>