joomla_test/libraries/joomla/cache/storage/apc.php
2020-01-02 22:20:31 +07:00

249 lines
5.2 KiB
PHP

<?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;
/**
* APC cache storage handler
*
* @package Joomla.Platform
* @subpackage Cache
* @see http://php.net/manual/en/book.apc.php
* @since 11.1
*/
class JCacheStorageApc extends JCacheStorage
{
/**
* Get cached data from APC 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, $group);
return apc_fetch($cache_id);
}
/**
* Get all cached data
*
* @return array data
*
* @since 11.1
*/
public function getAll()
{
parent::getAll();
$allinfo = apc_cache_info('user');
$keys = $allinfo['cache_list'];
$secret = $this->_hash;
$data = array();
foreach ($keys as $key)
{
$name = $key['info'];
$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['mem_size'] / 1024);
$data[$group] = $item;
}
}
return $data;
}
/**
* Store the data to APC 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, $group);
return apc_store($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, $group);
return apc_delete($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 $mode The mode for cleaning cache [group|notgroup]
*
* @return boolean True on success, false otherwise
*
* @since 11.1
*/
public function clean($group, $mode = null)
{
$allinfo = apc_cache_info('user');
$keys = $allinfo['cache_list'];
$secret = $this->_hash;
foreach ($keys as $key)
{
if (strpos($key['info'], $secret . '-cache-' . $group . '-') === 0 xor $mode != 'group')
{
apc_delete($key['info']);
}
}
return true;
}
/**
* Force garbage collect expired cache data as items are removed only on fetch!
*
* @return boolean True on success, false otherwise.
*
* @since 11.1
*/
public function gc()
{
$allinfo = apc_cache_info('user');
$keys = $allinfo['cache_list'];
$secret = $this->_hash;
foreach ($keys as $key)
{
if (strpos($key['info'], $secret . '-cache-'))
{
apc_fetch($key['info']);
}
}
}
/**
* Test to see if the cache storage is available.
*
* @return boolean True on success, false otherwise.
*
* @since 12.1
*/
public static function isSupported()
{
return extension_loaded('apc');
}
/**
* 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 $locktime Cached item max lock time
*
* @return object Properties are lock and locklooped
*
* @since 11.1
*/
public function lock($id, $group, $locktime)
{
$returning = new stdClass;
$returning->locklooped = false;
$looptime = $locktime * 10;
$cache_id = $this->_getCacheId($id, $group) . '_lock';
$data_lock = apc_add($cache_id, 1, $locktime);
if ($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);
$data_lock = apc_add($cache_id, 1, $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';
$unlock = apc_delete($cache_id);
return $unlock;
}
}