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<?php
/**
* Copyright (c) 2012 Bart Visscher <bartv@thisnet.nl>
* This file is licensed under the Affero General Public License version 3 or
* later.
* See the COPYING-README file.
*/
namespace OC\Memcache;
class Memcached extends Cache {
/**
* @var \Memcached $cache
*/
private static $cache = null;
public function __construct($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();
$keys = array();
$prefixLength = strlen($prefix);
foreach ($allKeys as $key) {
if (substr($key, 0, $prefixLength) === $prefix) {
$keys[] = $key;
}
}
self::$cache->deleteMulti($keys);
return true;
}
static public function isAvailable() {
return extension_loaded('memcached');
}
}
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