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<?php
/**
* @author Andreas Fischer <bantu@owncloud.com>
* @author Bart Visscher <bartv@thisnet.nl>
* @author Morris Jobke <hey@morrisjobke.de>
* @author Robin Appelman <icewind@owncloud.com>
*
* @copyright Copyright (c) 2015, ownCloud, Inc.
* @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 Memcached extends Cache implements IMemcache {
use CASTrait;
/**
* @var \Memcached $cache
*/
private static $cache = null;
use CADTrait;
public function __construct($prefix = '') {
parent::__construct($prefix);
if (is_null(self::$cache)) {
self::$cache = new \Memcached();
$servers = \OC_Config::getValue('memcached_servers');
if (!$servers) {
$server = \OC_Config::getValue('memcached_server');
if ($server) {
$servers = array($server);
} else {
$servers = array(array('localhost', 11211));
}
}
self::$cache->addServers($servers);
}
}
/**
* entries in XCache gets namespaced to prevent collisions between owncloud instances and users
*/
protected function getNameSpace() {
return $this->prefix;
}
public function get($key) {
$result = self::$cache->get($this->getNamespace() . $key);
if ($result === false and self::$cache->getResultCode() == \Memcached::RES_NOTFOUND) {
return null;
} else {
return $result;
}
}
public function set($key, $value, $ttl = 0) {
if ($ttl > 0) {
return self::$cache->set($this->getNamespace() . $key, $value, $ttl);
} else {
return self::$cache->set($this->getNamespace() . $key, $value);
}
}
public function hasKey($key) {
self::$cache->get($this->getNamespace() . $key);
return self::$cache->getResultCode() === \Memcached::RES_SUCCESS;
}
public function remove($key) {
return self::$cache->delete($this->getNamespace() . $key);
}
public function clear($prefix = '') {
$prefix = $this->getNamespace() . $prefix;
$allKeys = self::$cache->getAllKeys();
if ($allKeys === false) {
// newer Memcached doesn't like getAllKeys(), flush everything
self::$cache->flush();
return true;
}
$keys = array();
$prefixLength = strlen($prefix);
foreach ($allKeys as $key) {
if (substr($key, 0, $prefixLength) === $prefix) {
$keys[] = $key;
}
}
if (method_exists(self::$cache, 'deleteMulti')) {
self::$cache->deleteMulti($keys);
} else {
foreach ($keys as $key) {
self::$cache->delete($key);
}
}
return true;
}
/**
* 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, $ttl = 0) {
return self::$cache->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);
return self::$cache->increment($this->getPrefix() . $key, $step);
}
/**
* Decrease a stored number
*
* @param string $key
* @param int $step
* @return int | bool
*/
public function dec($key, $step = 1) {
return self::$cache->decrement($this->getPrefix() . $key, $step);
}
static public function isAvailable() {
return extension_loaded('memcached');
}
}
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