153 lines
3.8 KiB
PHP
153 lines
3.8 KiB
PHP
<?php
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/**
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* @author Andreas Fischer <bantu@owncloud.com>
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* @author Bart Visscher <bartv@thisnet.nl>
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* @author Morris Jobke <hey@morrisjobke.de>
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* @author Robin Appelman <icewind@owncloud.com>
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* @author Thomas Müller <thomas.mueller@tmit.eu>
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*
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* @copyright Copyright (c) 2015, ownCloud, Inc.
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* @license AGPL-3.0
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*
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* This code is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License, version 3,
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License, version 3,
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* along with this program. If not, see <http://www.gnu.org/licenses/>
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*
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*/
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namespace OC\Memcache;
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use OCP\IMemcache;
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/**
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* See http://xcache.lighttpd.net/wiki/XcacheApi for provided constants and
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* functions etc.
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*/
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class XCache extends Cache implements IMemcache {
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/**
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* entries in XCache gets namespaced to prevent collisions between ownCloud instances and users
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*/
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protected function getNameSpace() {
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return $this->prefix;
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}
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public function get($key) {
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return xcache_get($this->getNamespace() . $key);
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}
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public function set($key, $value, $ttl = 0) {
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if ($ttl > 0) {
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return xcache_set($this->getNamespace() . $key, $value, $ttl);
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} else {
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return xcache_set($this->getNamespace() . $key, $value);
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}
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}
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public function hasKey($key) {
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return xcache_isset($this->getNamespace() . $key);
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}
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public function remove($key) {
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return xcache_unset($this->getNamespace() . $key);
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}
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public function clear($prefix = '') {
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if (function_exists('xcache_unset_by_prefix')) {
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return xcache_unset_by_prefix($this->getNamespace() . $prefix);
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} else {
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// Since we can not clear by prefix, we just clear the whole cache.
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xcache_clear_cache(\XC_TYPE_VAR, 0);
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}
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return true;
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}
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/**
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* Set a value in the cache if it's not already stored
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*
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* @param string $key
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* @param mixed $value
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* @param int $ttl Time To Live in seconds. Defaults to 60*60*24
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* @return bool
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*/
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public function add($key, $value, $ttl = 0) {
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if ($this->hasKey($key)) {
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return false;
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} else {
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return $this->set($key, $value, $ttl);
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}
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}
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/**
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* Increase a stored number
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*
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* @param string $key
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* @param int $step
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* @return int | bool
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*/
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public function inc($key, $step = 1) {
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return xcache_inc($this->getPrefix() . $key, $step);
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}
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/**
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* Decrease a stored number
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*
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* @param string $key
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* @param int $step
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* @return int | bool
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*/
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public function dec($key, $step = 1) {
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return xcache_dec($this->getPrefix() . $key, $step);
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}
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/**
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* Compare and set
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*
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* @param string $key
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* @param mixed $old
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* @param mixed $new
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* @return bool
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*/
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public function cas($key, $old, $new) {
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//no native cas, emulate with locking
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if ($this->add($key . '_lock', true)) {
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if ($this->get($key) === $old) {
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$this->set($key, $new);
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$this->remove($key . '_lock');
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return true;
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} else {
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$this->remove($key . '_lock');
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return false;
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}
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} else {
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return false;
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}
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}
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static public function isAvailable() {
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if (!extension_loaded('xcache')) {
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return false;
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}
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if (\OC::$CLI && !getenv('XCACHE_TEST')) {
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return false;
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}
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if (!function_exists('xcache_unset_by_prefix') && ini_get('xcache.admin.enable_auth')) {
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// We do not want to use XCache if we can not clear it without
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// using the administration function xcache_clear_cache()
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// AND administration functions are password-protected.
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return false;
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}
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$var_size = (int)ini_get('xcache.var_size');
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if (!$var_size) {
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return false;
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}
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return true;
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}
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}
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