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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 Joas Schilling <coding@schilljs.com>
* @author Morris Jobke <hey@morrisjobke.de>
* @author Robin Appelman <robin@icewind.nl>
* @author Roeland Jago Douma <roeland@famdouma.nl>
* @author Thomas Müller <thomas.mueller@tmit.eu>
*
* @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;
/**
* See http://xcache.lighttpd.net/wiki/XcacheApi for provided constants and
* functions etc.
*/
class XCache extends Cache implements IMemcache {
use CASTrait;
use CADTrait;
/**
* entries in XCache gets namespaced to prevent collisions between ownCloud instances and users
*/
protected function getNameSpace() {
return $this->prefix;
}
public function get($key) {
return xcache_get($this->getNameSpace() . $key);
}
public function set($key, $value, $ttl = 0) {
if ($ttl > 0) {
return xcache_set($this->getNameSpace() . $key, $value, $ttl);
} else {
return xcache_set($this->getNameSpace() . $key, $value);
}
}
public function hasKey($key) {
return xcache_isset($this->getNameSpace() . $key);
}
public function remove($key) {
return xcache_unset($this->getNameSpace() . $key);
}
public function clear($prefix = '') {
if (function_exists('xcache_unset_by_prefix')) {
return xcache_unset_by_prefix($this->getNameSpace() . $prefix);
} else {
// Since we can not clear by prefix, we just clear the whole cache.
xcache_clear_cache(\XC_TYPE_VAR, 0);
}
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, $ttl = 0) {
if ($this->hasKey($key)) {
return false;
} else {
return $this->set($key, $value, $ttl);
}
}
/**
* Increase a stored number
*
* @param string $key
* @param int $step
* @return int | bool
*/
public function inc($key, $step = 1) {
return xcache_inc($this->getPrefix() . $key, $step);
}
/**
* Decrease a stored number
*
* @param string $key
* @param int $step
* @return int | bool
*/
public function dec($key, $step = 1) {
return xcache_dec($this->getPrefix() . $key, $step);
}
static public function isAvailable() {
if (!extension_loaded('xcache')) {
return false;
}
if (\OC::$CLI && !getenv('XCACHE_TEST')) {
return false;
}
if (!function_exists('xcache_unset_by_prefix') && \OC::$server->getIniWrapper()->getBool('xcache.admin.enable_auth')) {
// We do not want to use XCache if we can not clear it without
// using the administration function xcache_clear_cache()
// AND administration functions are password-protected.
return false;
}
$var_size = \OC::$server->getIniWrapper()->getBytes('xcache.var_size');
if (!$var_size) {
return false;
}
return true;
}
}
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