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<?php
/**
* Joomla! Content Management System
*
* @copyright (C) 2016 Open Source Matters, Inc. <https://www.joomla.org>
* @license GNU General Public License version 2 or later; see LICENSE.txt
*/
namespace Joomla\CMS\Cache\Storage;
use Joomla\CMS\Cache\CacheStorage;
// phpcs:disable PSR1.Files.SideEffects
\defined('_JEXEC') or die;
// phpcs:enable PSR1.Files.SideEffects
/**
* APCu cache storage handler
*
* @link https://www.php.net/manual/en/ref.apcu.php
* @since 3.5
*/
class ApcuStorage extends CacheStorage
{
/**
* Check if the cache contains data stored by ID and group
*
* @param string $id The cache data ID
* @param string $group The cache data group
*
* @return boolean
*
* @since 3.7.0
*/
public function contains($id, $group)
{
return apcu_exists($this->_getCacheId($id, $group));
}
/**
* Get cached data by ID and group
*
* @param string $id The cache data ID
* @param string $group The cache data group
* @param boolean $checkTime True to verify cache time expiration threshold
*
* @return mixed Boolean false on failure or a cached data object
*
* @since 3.5
*/
public function get($id, $group, $checkTime = true)
{
return apcu_fetch($this->_getCacheId($id, $group));
}
/**
* Get all cached data
*
* @return mixed Boolean false on failure or a cached data object
*
* @since 3.5
*/
public function getAll()
{
$allinfo = apcu_cache_info();
$keys = $allinfo['cache_list'];
$secret = $this->_hash;
$data = [];
foreach ($keys as $key) {
if (isset($key['info'])) {
// The internal key name changed with APCu 4.0.7 from key to info
$name = $key['info'];
} elseif (isset($key['entry_name'])) {
// Some APCu modules changed the internal key name from key to entry_name
$name = $key['entry_name'];
} else {
// A fall back for the old internal key name
$name = $key['key'];
}
$namearr = explode('-', $name);
if ($namearr !== false && $namearr[0] == $secret && $namearr[1] === 'cache') {
$group = $namearr[2];
if (!isset($data[$group])) {
$item = new CacheStorageHelper($group);
} else {
$item = $data[$group];
}
$item->updateSize($key['mem_size']);
$data[$group] = $item;
}
}
return $data;
}
/**
* Store the data to cache by ID and group
*
* @param string $id The cache data ID
* @param string $group The cache data group
* @param string $data The data to store in cache
*
* @return boolean
*
* @since 3.5
*/
public function store($id, $group, $data)
{
return apcu_store($this->_getCacheId($id, $group), $data, $this->_lifetime);
}
/**
* Remove a cached data entry by ID and group
*
* @param string $id The cache data ID
* @param string $group The cache data group
*
* @return boolean
*
* @since 3.5
*/
public function remove($id, $group)
{
$cache_id = $this->_getCacheId($id, $group);
// The apcu_delete function returns false if the ID does not exist
if (apcu_exists($cache_id)) {
return apcu_delete($cache_id);
}
return true;
}
/**
* 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 $mode The mode for cleaning cache [group|notgroup]
*
* @return boolean
*
* @since 3.5
*/
public function clean($group, $mode = null)
{
$allinfo = apcu_cache_info();
$keys = $allinfo['cache_list'];
$secret = $this->_hash;
foreach ($keys as $key) {
if (isset($key['info'])) {
// The internal key name changed with APCu 4.0.7 from key to info
$internalKey = $key['info'];
} elseif (isset($key['entry_name'])) {
// Some APCu modules changed the internal key name from key to entry_name
$internalKey = $key['entry_name'];
} else {
// A fall back for the old internal key name
$internalKey = $key['key'];
}
if (strpos($internalKey, $secret . '-cache-' . $group . '-') === 0 xor $mode !== 'group') {
apcu_delete($internalKey);
}
}
return true;
}
/**
* Garbage collect expired cache data
*
* @return boolean
*
* @since 3.5
*/
public function gc()
{
$allinfo = apcu_cache_info();
$keys = $allinfo['cache_list'];
$secret = $this->_hash;
foreach ($keys as $key) {
if (isset($key['info'])) {
// The internal key name changed with APCu 4.0.7 from key to info
$internalKey = $key['info'];
} elseif (isset($key['entry_name'])) {
// Some APCu modules changed the internal key name from key to entry_name
$internalKey = $key['entry_name'];
} else {
// A fall back for the old internal key name
$internalKey = $key['key'];
}
if (strpos($internalKey, $secret . '-cache-')) {
apcu_fetch($internalKey);
}
}
return true;
}
/**
* Test to see if the storage handler is available.
*
* @return boolean
*
* @since 3.5
*/
public static function isSupported()
{
$supported = \extension_loaded('apcu') && ini_get('apc.enabled');
// If on the CLI interface, the `apc.enable_cli` option must also be enabled
if ($supported && PHP_SAPI === 'cli') {
$supported = ini_get('apc.enable_cli');
}
return (bool) $supported;
}
/**
* Lock cached item
*
* @param string $id The cache data ID
* @param string $group The cache data group
* @param integer $locktime Cached item max lock time
*
* @return mixed Boolean false if locking failed or an object containing properties lock and locklooped
*
* @since 3.5
*/
public function lock($id, $group, $locktime)
{
$returning = new \stdClass();
$returning->locklooped = false;
$looptime = $locktime * 10;
$cache_id = $this->_getCacheId($id, $group) . '_lock';
$data_lock = apcu_add($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);
$data_lock = apcu_add($cache_id, 1, $locktime);
$lock_counter++;
}
}
$returning->locked = $data_lock;
return $returning;
}
/**
* Unlock cached item
*
* @param string $id The cache data ID
* @param string $group The cache data group
*
* @return boolean
*
* @since 3.5
*/
public function unlock($id, $group = null)
{
$cache_id = $this->_getCacheId($id, $group) . '_lock';
// The apcu_delete function returns false if the ID does not exist
if (apcu_exists($cache_id)) {
return apcu_delete($cache_id);
}
return true;
}
}