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<?php
/**
* @copyright Copyright (c) 2016, ownCloud, Inc.
*
* @author Andreas Fischer <bantu@owncloud.com>
* @author Bart Visscher <bartv@thisnet.nl>
* @author Clark Tomlinson <fallen013@gmail.com>
* @author Lukas Reschke <lukas@statuscode.ch>
* @author Morris Jobke <hey@morrisjobke.de>
* @author Robin Appelman <robin@icewind.nl>
*
* @license AGPL-3.0
*
* This code is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License, version 3,
* along with this program. If not, see <http://www.gnu.org/licenses/>
*
*/
namespace OC\Memcache;
use OCP\IMemcache;
class APCu extends Cache implements IMemcache {
use CASTrait {
cas as casEmulated;
}
use CADTrait;
public function get($key) {
$result = apcu_fetch($this->getPrefix() . $key, $success);
if (!$success) {
return null;
}
return $result;
}
public function set($key, $value, $ttl = 0) {
return apcu_store($this->getPrefix() . $key, $value, $ttl);
}
public function hasKey($key) {
return apcu_exists($this->getPrefix() . $key);
}
public function remove($key) {
return apcu_delete($this->getPrefix() . $key);
}
public function clear($prefix = '') {
$ns = $this->getPrefix() . $prefix;
$ns = preg_quote($ns, '/');
if(class_exists('\APCIterator')) {
$iter = new \APCIterator('user', '/^' . $ns . '/', APC_ITER_KEY);
} else {
$iter = new \APCUIterator('/^' . $ns . '/', APC_ITER_KEY);
}
return apcu_delete($iter);
}
/**
* Set a value in the cache if it's not already stored
*
* @param string $key
* @param mixed $value
* @param int $ttl Time To Live in seconds. Defaults to 60*60*24
* @return bool
*/
public function add($key, $value, $ttl = 0) {
return apcu_add($this->getPrefix() . $key, $value, $ttl);
}
/**
* Increase a stored number
*
* @param string $key
* @param int $step
* @return int | bool
*/
public function inc($key, $step = 1) {
$this->add($key, 0);
/**
* TODO - hack around a PHP 7 specific issue in APCu
*
* on PHP 7 the apcu_inc method on a non-existing object will increment
* "0" and result in "1" as value - therefore we check for existence
* first
*
* on PHP 5.6 this is not the case
*
* see https://github.com/krakjoe/apcu/issues/183#issuecomment-244038221
* for details
*/
return apcu_exists($this->getPrefix() . $key)
? apcu_inc($this->getPrefix() . $key, $step)
: false;
}
/**
* Decrease a stored number
*
* @param string $key
* @param int $step
* @return int | bool
*/
public function dec($key, $step = 1) {
/**
* TODO - hack around a PHP 7 specific issue in APCu
*
* on PHP 7 the apcu_dec method on a non-existing object will decrement
* "0" and result in "-1" as value - therefore we check for existence
* first
*
* on PHP 5.6 this is not the case
*
* see https://github.com/krakjoe/apcu/issues/183#issuecomment-244038221
* for details
*/
return apcu_exists($this->getPrefix() . $key)
? apcu_dec($this->getPrefix() . $key, $step)
: false;
}
/**
* Compare and set
*
* @param string $key
* @param mixed $old
* @param mixed $new
* @return bool
*/
public function cas($key, $old, $new) {
// apc only does cas for ints
if (is_int($old) and is_int($new)) {
return apcu_cas($this->getPrefix() . $key, $old, $new);
} else {
return $this->casEmulated($key, $old, $new);
}
}
/**
* @return bool
*/
static public function isAvailable() {
if (!extension_loaded('apcu')) {
return false;
} elseif (!\OC::$server->getIniWrapper()->getBool('apc.enabled')) {
return false;
} elseif (!\OC::$server->getIniWrapper()->getBool('apc.enable_cli') && \OC::$CLI) {
return false;
} elseif (
version_compare(phpversion('apc'), '4.0.6') === -1 &&
version_compare(phpversion('apcu'), '5.1.0') === -1
) {
return false;
} else {
return true;
}
}
}