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<?php
/**
* @package Joomla.Platform
* @subpackage Cache
*
* @copyright Copyright (C) 2005 - 2013 Open Source Matters, Inc. All rights reserved.
* @license GNU General Public License version 2 or later; see LICENSE
*/
defined('JPATH_PLATFORM') or die;
/**
* eAccelerator cache storage handler
*
* @package Joomla.Platform
* @subpackage Cache
* @link http://eaccelerator.net/
* @since 11.1
*/
class JCacheStorageEaccelerator extends JCacheStorage
{
/**
* Constructor
*
* @param array $options Optional parameters.
*
* @since 11.1
*/
public function __construct($options = array())
{
parent::__construct($options);
}
/**
* Get cached data 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);
$cache_content = eaccelerator_get($cache_id);
if ($cache_content === null)
{
return false;
}
return $cache_content;
}
/**
* Get all cached data
*
* @return array data
*
* @since 11.1
*/
public function getAll()
{
parent::getAll();
$keys = eaccelerator_list_keys();
$secret = $this->_hash;
$data = array();
foreach ($keys as $key)
{
/* Trim leading ":" to work around list_keys namespace bug in eAcc. This will still work when bug is fixed */
// http://eaccelerator.net/ticket/287
$name = ltrim($key['name'], ':');
$namearr = explode('-', $name);
if ($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 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, $group);
return eaccelerator_put($cache_id, $data, $this->_lifetime);
}
/**
* 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, $group);
return eaccelerator_rm($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)
{
$keys = eaccelerator_list_keys();
$secret = $this->_hash;
if (is_array($keys))
{
foreach ($keys as $key)
{
/* Trim leading ":" to work around list_keys namespace bug in eAcc. This will still work when bug is fixed */
$key['name'] = ltrim($key['name'], ':');
if (strpos($key['name'], $secret . '-cache-' . $group . '-') === 0 xor $mode != 'group')
{
eaccelerator_rm($key['name']);
}
}
}
return true;
}
/**
* Garbage collect expired cache data
*
* @return boolean True on success, false otherwise.
*
* @since 11.1
*/
public function gc()
{
return eaccelerator_gc();
}
/**
* Test to see if the cache storage is available.
*
* @return boolean True on success, false otherwise.
*
* @since 11.1
*/
public static function test()
{
return (extension_loaded('eaccelerator') && function_exists('eaccelerator_get'));
}
/**
* Lock cached item
*
* @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);
$data_lock = eaccelerator_lock($cache_id);
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);
$data_lock = eaccelerator_lock($cache_id);
$lock_counter++;
}
}
$returning->locked = $data_lock;
return $returning;
}
/**
* Unlock cached item
*
* @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, $group);
return eaccelerator_unlock($cache_id);
}
}