/libraries/joomla/cache/storage/memcache.php
PHP | 410 lines | 218 code | 70 blank | 122 comment | 43 complexity | d665784ae0c640ae6bbfc1917f9a14d3 MD5 | raw file
- <?php
- /**
- * @version $Id: memcache.php 20228 2011-01-10 00:52:54Z eddieajau $
- * @package Joomla.Framework
- * @subpackage Cache
- * @copyright Copyright (C) 2005 - 2011 Open Source Matters, Inc. All rights reserved.
- * @license GNU General Public License version 2 or later; see LICENSE.txt
- */
- // No direct access
- defined('JPATH_BASE') or die;
- /**
- * Memcache cache storage handler
- *
- * @package Joomla.Framework
- * @subpackage Cache
- * @since 1.5
- */
- class JCacheStorageMemcache extends JCacheStorage
- {
- /**
- * @since 1.5
- */
- private static $_db = null;
- /**
- * @since 1.6
- */
- private $_persistent = false;
- /**
- * @since 1.6
- */
- private $_compress = 0;
- /**
- * Constructor
- *
- * @param array $options optional parameters
- * @since 1.5
- */
- public function __construct($options = array())
- {
- parent::__construct($options);
- if (self::$_db === null) {
- $this->getConnection();
- }
- }
- /**
- * return memcache connection object
- *
- * @return object memcache connection object
- * @since 1.5
- */
- private function getConnection()
- {
- if ((extension_loaded('memcache') && class_exists('Memcache')) != true ) {
- return false;
- }
- $config = JFactory::getConfig();
- $this->_persistent = $config->get('memcache_persist', true);
- $this->_compress = $config->get('memcache_compress', false) == false ? 0 : MEMCACHE_COMPRESSED;
- // This will be an array of loveliness
- // @todo: multiple servers
- //$servers = (isset($params['servers'])) ? $params['servers'] : array();
- $server=array();
- $server['host'] = $config->get('memcache_server_host', 'localhost');
- $server['port'] = $config->get('memcache_server_port', 11211);
- // Create the memcache connection
- self::$_db = new Memcache;
- self::$_db->addServer($server['host'], $server['port'], $this->_persistent);
- $memcachetest = @self::$_db->connect($server['host'], $server['port']);
- if ($memcachetest == false) {
- return JError::raiseError(404, "Could not connect to memcache server");
- }
- // memcahed has no list keys, we do our own accounting, initalise key index
- if (self::$_db->get($this->_hash.'-index') === false) {
- $empty = array();
- self::$_db->set($this->_hash.'-index', $empty , $this->_compress, 0);
- }
- return;
- }
- /**
- * Get cached data from memcache by id and group
- *
- * @param string $id The cache data id
- * @param string $group The cache data group
- * @param boolean $checkTime True to verify cache time expiration threshold
- * @return mixed Boolean false on failure or a cached data string
- * @since 1.5
- */
- public function get($id, $group, $checkTime = true)
- {
- $cache_id = $this->_getCacheId($id, $group);
- $back = self::$_db->get($cache_id);
- return $back;
- }
- /**
- * Get all cached data
- *
- * @return array data
- * @since 1.6
- */
- public function getAll()
- {
- parent::getAll();
- $keys = self::$_db->get($this->_hash.'-index');
- $secret = $this->_hash;
- $data = array();
- if (!empty($keys)){
- foreach ($keys as $key) {
- if (empty($key)) {
- continue;
- }
- $namearr=explode('-',$key->name);
- if ($namearr !== false && $namearr[0]==$secret && $namearr[1]=='cache') {
- $group = $namearr[2];
- if (!isset($data[$group])) {
- $item = new JCacheStorageHelper($group);
- } else {
- $item = $data[$group];
- }
- $item->updateSize($key->size/1024);
- $data[$group] = $item;
- }
- }
- }
- return $data;
- }
- /**
- * Store the data to memcache by id and group
- *
- * @param string $id The cache data id
- * @param string $group The cache data group
- * @param string $data The data to store in cache
- * @return boolean True on success, false otherwise
- * @since 1.5
- */
- public function store($id, $group, $data)
- {
- $cache_id = $this->_getCacheId($id, $group);
- if (!$this->lockindex()) {
- return false;
- }
- $index = self::$_db->get($this->_hash.'-index');
- if ($index === false) {
- $index = array();
- }
- $tmparr = new stdClass;
- $tmparr->name = $cache_id;
- $tmparr->size = strlen($data);
- $index[] = $tmparr;
- self::$_db->replace($this->_hash.'-index', $index , 0, 0);
- $this->unlockindex();
- // prevent double writes, write only if it doesn't exist else replace
- if (!self::$_db->replace($cache_id, $data, $this->_compress, $this->_lifetime)) {
- self::$_db->set($cache_id, $data, $this->_compress, $this->_lifetime);
- }
- return true;
- }
- /**
- * Remove a cached data entry by id and group
- *
- * @param string $id The cache data id
- * @param string $group The cache data group
- * @return boolean True on success, false otherwise
- * @since 1.5
- */
- public function remove($id, $group)
- {
- $cache_id = $this->_getCacheId($id, $group);
- if (!$this->lockindex()) {
- return false;
- }
- $index = self::$_db->get($this->_hash.'-index');
- if ($index === false) {
- $index = array();
- }
- foreach ($index as $key => $value) {
- if ($value->name == $cache_id) unset ($index[$key]);
- break;
- }
- self::$_db->replace($this->_hash.'-index', $index, 0, 0);
- $this->unlockindex();
- return self::$_db->delete($cache_id);
- }
- /**
- * Clean cache for a group given a mode.
- *
- * group mode : cleans all cache in the group
- * notgroup mode : cleans all cache not in the group
- *
- * @param string $group The cache data group
- * @param string $mode The mode for cleaning cache [group|notgroup]
- * @return boolean True on success, false otherwise
- * @since 1.5
- */
- public function clean($group, $mode = null)
- {
- if (!$this->lockindex()) {
- return false;
- }
- $index = self::$_db->get($this->_hash.'-index');
- if ($index === false) {
- $index = array();
- }
- $secret = $this->_hash;
- foreach ($index as $key=>$value) {
- if (strpos($value->name, $secret.'-cache-'.$group.'-')===0 xor $mode != 'group') {
- self::$_db->delete($value->name,0);
- unset ($index[$key]);
- }
- }
- self::$_db->replace($this->_hash.'-index', $index , 0, 0);
- $this->unlockindex();
- return true;
- }
- /**
- * Test to see if the cache storage is available.
- *
- * @return boolean True on success, false otherwise.
- */
- public static function test()
- {
- if ((extension_loaded('memcache') && class_exists('Memcache')) != true ) {
- return false;
- }
- $config = JFactory::getConfig();
- $host = $config->get('memcache_server_host', 'localhost');
- $port = $config->get('memcache_server_port', 11211);
- $memcache = new Memcache;
- $memcachetest = @$memcache->connect($host, $port);
- if (!$memcachetest) {
- return false;
- } else {
- return true;
- }
- }
- /**
- * Lock cached item - override parent as this is more efficient
- *
- * @param string $id The cache data id
- * @param string $group The cache data group
- * @param integer $locktime Cached item max lock time
- * @return boolean True on success, false otherwise.
- * @since 1.6
- */
- public function lock($id,$group,$locktime)
- {
- $returning = new stdClass();
- $returning->locklooped = false;
- $looptime = $locktime * 10;
- $cache_id = $this->_getCacheId($id, $group);
- if (!$this->lockindex()) {
- return false;
- }
- $index = self::$_db->get($this->_hash.'-index');
- if ($index === false) {
- $index = array();
- }
- $tmparr = new stdClass;
- $tmparr->name = $cache_id;
- $tmparr->size = 1;
- $index[] = $tmparr;
- self::$_db->replace($this->_hash.'-index', $index , 0, 0);
- $this->unlockindex();
- $data_lock = self::$_db->add($cache_id.'_lock', 1, false, $locktime);
- if ($data_lock === FALSE) {
- $lock_counter = 0;
- // loop until you find that the lock has been released. that implies that data get from other thread has finished
- while ($data_lock === FALSE) {
- if ($lock_counter > $looptime) {
- $returning->locked = false;
- $returning->locklooped = true;
- break;
- }
- usleep(100);
- $data_lock = self::$_db->add($cache_id.'_lock', 1, false, $locktime);
- $lock_counter++;
- }
- }
- $returning->locked = $data_lock;
- return $returning;
- }
- /**
- * Unlock cached item - override parent for cacheid compatibility with lock
- *
- * @param string $id The cache data id
- * @param string $group The cache data group
- * @param integer $locktime Cached item max lock time
- * @since 1.6
- * @return boolean True on success, false otherwise.
- */
- public function unlock($id,$group=null)
- {
- $unlock = false;
- $cache_id = $this->_getCacheId($id, $group).'_lock';
- if (!$this->lockindex()) return false;
- $index = self::$_db->get($this->_hash.'-index');
- if ($index === false) {$index = array();}
- foreach ($index as $key=>$value){
- if ($value->name == $cache_id) unset ($index[$key]);
- break;
- }
- self::$_db->replace($this->_hash.'-index', $index, 0, 0);
- $this->unlockindex();
- return self::$_db->delete($cache_id);
- }
- /**
- * Lock cache index
- *
- * @since 1.6
- * @return boolean True on success, false otherwise.
- */
- private function lockindex()
- {
- $looptime = 300;
- $data_lock = self::$_db->add($this->_hash.'-index_lock', 1, false, 30);
- if ($data_lock === FALSE) {
- $lock_counter = 0;
- // loop until you find that the lock has been released. that implies that data get from other thread has finished
- while ( $data_lock === FALSE ) {
- if ( $lock_counter > $looptime ) {
- return false;
- break;
- }
- usleep(100);
- $data_lock = self::$_db->add($this->_hash.'-index_lock', 1, false, 30);
- $lock_counter++;
- }
- }
- return true;
- }
- /**
- * Unlock cache index
- *
- * @return boolean True on success, false otherwise.
- * @since 1.6
- */
- private function unlockindex()
- {
- return self::$_db->delete($this->_hash.'-index_lock');
- }
- }