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<?php
/**
* @package Joomla.Platform
* @subpackage Cache
*
* @copyright Copyright (C) 2005 - 2015 Open Source Matters, Inc. All rights reserved.
* @license GNU General Public License version 2 or later; see LICENSE
*/
defined('JPATH_PLATFORM') or die;
/**
* Memcache cache storage handler
*
* @see http://php.net/manual/en/book.memcache.php
* @since 11.1
*/
class JCacheStorageMemcache extends JCacheStorage
{
/**
* Memcache connection object
*
* @var Memcache
* @since 11.1
*/
protected static $_db = null;
/**
* Persistent session flag
*
* @var boolean
* @since 11.1
*/
protected $_persistent = false;
/**
* Payload compression level
*
* @var integer
* @since 11.1
*/
protected $_compress = 0;
/**
* Constructor
*
* @param array $options Optional parameters.
*
* @since 11.1
*/
public function __construct($options = array())
{
parent::__construct($options);
if (self::$_db === null)
{
$this->getConnection();
}
}
/**
* Return memcache connection object
*
* @return mixed Memcache connection object if present
*
* @since 11.1
* @throws RuntimeException
*/
protected 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)
{
throw new RuntimeException('Could not connect to memcache server', 404);
}
// Memcahed has no list keys, we do our own accounting, initialise 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 $checkTime True to verify cache time expiration threshold
*
* @return mixed Boolean false on failure or a cached data string
*
* @since 11.1
*/
public function get($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 11.1
*/
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 $data The data to store in cache
*
* @return boolean True on success, false otherwise
*
* @since 11.1
*/
public function store($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);
$config = JFactory::getConfig();
$lifetime = (int) $config->get('cachetime', 15);
if ($this->_lifetime == $lifetime)
{
$this->_lifetime = $lifetime * 60;
}
$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 $group The cache data group
*
* @return boolean True on success, false otherwise
*
* @since 11.1
*/
public function remove($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.
*
* @param string $group The cache data group
* @param string $mode The mode for cleaning cache [group|notgroup]
* group mode : cleans all cache in the group
* notgroup mode : cleans all cache not in the group
*
* @return boolean True on success, false otherwise
*
* @since 11.1
*/
public function clean($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.
*
* @since 12.1
*/
public static function isSupported()
{
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 $locktime Cached item max lock time
*
* @return boolean True on success, false otherwise.
*
* @since 11.1
*/
public function lock($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 $group The cache data group
*
* @return boolean True on success, false otherwise.
*
* @since 11.1
*/
public function unlock($id, $group = null)
{
$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
*
* @return boolean True on success, false otherwise.
*
* @since 11.1
*/
protected 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);
$lock_counter++;
}
}
return true;
}
/**
* Unlock cache index
*
* @return boolean True on success, false otherwise.
*
* @since 11.1
*/
protected function unlockindex()
{
return self::$_db->delete($this->_hash . '-index_lock');
}
}
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