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| <?php | |
| /** | |
| * 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 | |
| * @package Zend_Cache | |
| * @subpackage Zend_Cache_Backend | |
| * @copyright Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com) | |
| * @license http://framework.zend.com/license/new-bsd New BSD License | |
| * @version $Id: Memcached.php 22207 2010-05-20 16:47:16Z mabe $ | |
| */ | |
| /** | |
| * @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 | |
| * @copyright Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com) | |
| * @license http://framework.zend.com/license/new-bsd New BSD License | |
| */ | |
| class Zend_Cache_Backend_Memcached extends Zend_Cache_Backend implements Zend_Cache_Backend_ExtendedInterface | |
| { | |
| /** | |
| * Default Values | |
| */ | |
| const DEFAULT_HOST = '127.0.0.1'; | |
| const DEFAULT_PORT = 11211; | |
| const DEFAULT_PERSISTENT = true; | |
| const DEFAULT_WEIGHT = 1; | |
| const DEFAULT_TIMEOUT = 1; | |
| const DEFAULT_RETRY_INTERVAL = 15; | |
| const DEFAULT_STATUS = true; | |
| const DEFAULT_FAILURE_CALLBACK = null; | |
| /** | |
| * Log message | |
| */ | |
| const TAGS_UNSUPPORTED_BY_CLEAN_OF_MEMCACHED_BACKEND = 'Zend_Cache_Backend_Memcached::clean() : tags are unsupported by the Memcached backend'; | |
| const TAGS_UNSUPPORTED_BY_SAVE_OF_MEMCACHED_BACKEND = 'Zend_Cache_Backend_Memcached::save() : tags are unsupported by the Memcached backend'; | |
| /** | |
| * 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 | |
| * | |
| * @var array available options | |
| */ | |
| protected $_options = array( | |
| 'servers' => array(array( | |
| 'host' => self::DEFAULT_HOST, | |
| 'port' => self::DEFAULT_PORT, | |
| 'persistent' => self::DEFAULT_PERSISTENT, | |
| 'weight' => self::DEFAULT_WEIGHT, | |
| 'timeout' => self::DEFAULT_TIMEOUT, | |
| 'retry_interval' => self::DEFAULT_RETRY_INTERVAL, | |
| 'status' => self::DEFAULT_STATUS, | |
| 'failure_callback' => self::DEFAULT_FAILURE_CALLBACK | |
| )), | |
| 'compression' => false, | |
| 'compatibility' => false, | |
| ); | |
| /** | |
| * Memcache object | |
| * | |
| * @var mixed memcache object | |
| */ | |
| protected $_memcache = null; | |
| /** | |
| * Constructor | |
| * | |
| * @param array $options associative array of options | |
| * @throws Zend_Cache_Exception | |
| * @return void | |
| */ | |
| public function __construct(array $options = array()) | |
| { | |
| if (!extension_loaded('memcache')) { | |
| Zend_Cache::throwException('The memcache extension must be loaded for using this backend !'); | |
| } | |
| parent::__construct($options); | |
| if (isset($this->_options['servers'])) { | |
| $value= $this->_options['servers']; | |
| if (isset($value['host'])) { | |
| // in this case, $value seems to be a simple associative array (one server only) | |
| $value = array(0 => $value); // let's transform it into a classical array of associative arrays | |
| } | |
| $this->setOption('servers', $value); | |
| } | |
| $this->_memcache = new Memcache; | |
| foreach ($this->_options['servers'] as $server) { | |
| if (!array_key_exists('port', $server)) { | |
| $server['port'] = self::DEFAULT_PORT; | |
| } | |
| if (!array_key_exists('persistent', $server)) { | |
| $server['persistent'] = self::DEFAULT_PERSISTENT; | |
| } | |
| if (!array_key_exists('weight', $server)) { | |
| $server['weight'] = self::DEFAULT_WEIGHT; | |
| } | |
| if (!array_key_exists('timeout', $server)) { | |
| $server['timeout'] = self::DEFAULT_TIMEOUT; | |
| } | |
| if (!array_key_exists('retry_interval', $server)) { | |
| $server['retry_interval'] = self::DEFAULT_RETRY_INTERVAL; | |
| } | |
| if (!array_key_exists('status', $server)) { | |
| $server['status'] = self::DEFAULT_STATUS; | |
| } | |
| if (!array_key_exists('failure_callback', $server)) { | |
| $server['failure_callback'] = self::DEFAULT_FAILURE_CALLBACK; | |
| } | |
| if ($this->_options['compatibility']) { | |
| // No status for compatibility mode (#ZF-5887) | |
| $this->_memcache->addServer($server['host'], $server['port'], $server['persistent'], | |
| $server['weight'], $server['timeout'], | |
| $server['retry_interval']); | |
| } else { | |
| $this->_memcache->addServer($server['host'], $server['port'], $server['persistent'], | |
| $server['weight'], $server['timeout'], | |
| $server['retry_interval'], | |
| $server['status'], $server['failure_callback']); | |
| } | |
| } | |
| } | |
| /** | |
| * Test if a cache is available for the given id and (if yes) return it (false else) | |
| * | |
| * @param string $id Cache id | |
| * @param boolean $doNotTestCacheValidity If set to true, the cache validity won't be tested | |
| * @return string|false cached datas | |
| */ | |
| public function load($id, $doNotTestCacheValidity = false) | |
| { | |
| $tmp = $this->_memcache->get($id); | |
| if (is_array($tmp) && isset($tmp[0])) { | |
| return $tmp[0]; | |
| } | |
| return false; | |
| } | |
| /** | |
| * Test if a cache is available or not (for the given id) | |
| * | |
| * @param string $id Cache id | |
| * @return mixed|false (a cache is not available) or "last modified" timestamp (int) of the available cache record | |
| */ | |
| public function test($id) | |
| { | |
| $tmp = $this->_memcache->get($id); | |
| if (is_array($tmp)) { | |
| return $tmp[1]; | |
| } | |
| return false; | |
| } | |
| /** | |
| * 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 ($this->_options['compression']) { | |
| $flag = MEMCACHE_COMPRESSED; | |
| } else { | |
| $flag = 0; | |
| } | |
| // ZF-8856: using set because add needs a second request if item already exists | |
| $result = @$this->_memcache->set($id, array($data, time(), $lifetime), $flag, $lifetime); | |
| if (count($tags) > 0) { | |
| $this->_log(self::TAGS_UNSUPPORTED_BY_SAVE_OF_MEMCACHED_BACKEND); | |
| } | |
| return $result; | |
| } | |
| /** | |
| * Remove a cache record | |
| * | |
| * @param string $id Cache id | |
| * @return boolean True if no problem | |
| */ | |
| public function remove($id) | |
| { | |
| return $this->_memcache->delete($id, 0); | |
| } | |
| /** | |
| * 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 $this->_memcache->flush(); | |
| break; | |
| case Zend_Cache::CLEANING_MODE_OLD: | |
| $this->_log("Zend_Cache_Backend_Memcached::clean() : CLEANING_MODE_OLD is unsupported by the Memcached backend"); | |
| 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_MEMCACHED_BACKEND); | |
| break; | |
| default: | |
| Zend_Cache::throwException('Invalid mode for clean() method'); | |
| break; | |
| } | |
| } | |
| /** | |
| * Return true if the automatic cleaning is available for the backend | |
| * | |
| * @return boolean | |
| */ | |
| public function isAutomaticCleaningAvailable() | |
| { | |
| return false; | |
| } | |
| /** | |
| * Set the frontend directives | |
| * | |
| * @param array $directives Assoc of directives | |
| * @throws Zend_Cache_Exception | |
| * @return void | |
| */ | |
| public function setDirectives($directives) | |
| { | |
| parent::setDirectives($directives); | |
| $lifetime = $this->getLifetime(false); | |
| if ($lifetime > 2592000) { | |
| // #ZF-3490 : For the memcached backend, there is a lifetime limit of 30 days (2592000 seconds) | |
| $this->_log('memcached backend has a limit of 30 days (2592000 seconds) for the lifetime'); | |
| } | |
| if ($lifetime === null) { | |
| // #ZF-4614 : we tranform null to zero to get the maximal lifetime | |
| parent::setDirectives(array('lifetime' => 0)); | |
| } | |
| } | |
| /** | |
| * Return an array of stored cache ids | |
| * | |
| * @return array array of stored cache ids (string) | |
| */ | |
| public function getIds() | |
| { | |
| $this->_log("Zend_Cache_Backend_Memcached::save() : getting the list of cache ids is unsupported by the Memcache backend"); | |
| return array(); | |
| } | |
| /** | |
| * Return an array of stored tags | |
| * | |
| * @return array array of stored tags (string) | |
| */ | |
| public function getTags() | |
| { | |
| $this->_log(self::TAGS_UNSUPPORTED_BY_SAVE_OF_MEMCACHED_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_MEMCACHED_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_MEMCACHED_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_MEMCACHED_BACKEND); | |
| return array(); | |
| } | |
| /** | |
| * Return the filling percentage of the backend storage | |
| * | |
| * @throws Zend_Cache_Exception | |
| * @return int integer between 0 and 100 | |
| */ | |
| public function getFillingPercentage() | |
| { | |
| $mems = $this->_memcache->getExtendedStats(); | |
| $memSize = null; | |
| $memUsed = null; | |
| foreach ($mems as $key => $mem) { | |
| if ($mem === false) { | |
| $this->_log('can\'t get stat from ' . $key); | |
| continue; | |
| } | |
| $eachSize = $mem['limit_maxbytes']; | |
| $eachUsed = $mem['bytes']; | |
| if ($eachUsed > $eachSize) { | |
| $eachUsed = $eachSize; | |
| } | |
| $memSize += $eachSize; | |
| $memUsed += $eachUsed; | |
| } | |
| if ($memSize === null || $memUsed === null) { | |
| $mem = $this->_memcache->getstats(); | |
| if (isset($mem['limit_maxbytes']) && $mem['limit_maxbytes'] > 0) { | |
| return ((int) (100 * ($mem['bytes'] / $mem['limit_maxbytes']))); | |
| } else { | |
| return 100; | |
| } | |
| //Zend_Cache::throwException('Can\'t get filling percentage'); | |
| } | |
| return ((int) (100. * ($memUsed / $memSize))); | |
| } | |
| /** | |
| * 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) | |
| { | |
| $tmp = $this->_memcache->get($id); | |
| if (is_array($tmp)) { | |
| $data = $tmp[0]; | |
| $mtime = $tmp[1]; | |
| if (!isset($tmp[2])) { | |
| // because this record is only with 1.7 release | |
| // if old cache records are still there... | |
| return false; | |
| } | |
| $lifetime = $tmp[2]; | |
| return array( | |
| 'expire' => $mtime + $lifetime, | |
| 'tags' => array(), | |
| 'mtime' => $mtime | |
| ); | |
| } | |
| 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, $extraLifetime) | |
| { | |
| if ($this->_options['compression']) { | |
| $flag = MEMCACHE_COMPRESSED; | |
| } else { | |
| $flag = 0; | |
| } | |
| $tmp = $this->_memcache->get($id); | |
| if (is_array($tmp)) { | |
| $data = $tmp[0]; | |
| $mtime = $tmp[1]; | |
| if (!isset($tmp[2])) { | |
| // because this record is only with 1.7 release | |
| // if old cache records are still there... | |
| return false; | |
| } | |
| $lifetime = $tmp[2]; | |
| $newLifetime = $lifetime - (time() - $mtime) + $extraLifetime; | |
| if ($newLifetime <=0) { | |
| return false; | |
| } | |
| // #ZF-5702 : we try replace() first becase set() seems to be slower | |
| if (!($result = $this->_memcache->replace($id, array($data, time(), $newLifetime), $flag, $newLifetime))) { | |
| $result = $this->_memcache->set($id, array($data, time(), $newLifetime), $flag, $newLifetime); | |
| } | |
| return $result; | |
| } | |
| 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' => false | |
| ); | |
| } | |
| } |
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