114 lines
3.1 KiB
PHP
114 lines
3.1 KiB
PHP
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<?php
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/**
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* StatusNet, the distributed open-source microblogging tool
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*
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* Cache interface plus default in-memory cache implementation
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*
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* PHP version 5
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*
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* LICENCE: This program 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 as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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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
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* @category Cache
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* @package StatusNet
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* @author Evan Prodromou <evan@status.net>
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* @copyright 2009 StatusNet, Inc.
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* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
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* @link http://status.net/
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*/
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/**
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* Interface for caching
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*
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* An abstract interface for caching.
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*
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*/
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class Cache
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{
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var $_items = array();
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static $_inst = null;
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static function instance()
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{
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if (is_null(self::$_inst)) {
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self::$_inst = new Cache();
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}
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return self::$_inst;
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}
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static function key($extra)
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{
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$base_key = common_config('memcached', 'base');
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if (empty($base_key)) {
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$base_key = common_keyize(common_config('site', 'name'));
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}
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return 'statusnet:' . $base_key . ':' . $extra;
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}
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static function keyize($str)
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{
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$str = strtolower($str);
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$str = preg_replace('/\s/', '_', $str);
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return $str;
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}
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function get($key)
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{
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$value = null;
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if (!Event::handle('StartCacheGet', array(&$key, &$value))) {
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if (array_key_exists($_items, $key)) {
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common_log(LOG_INFO, 'Cache HIT for key ' . $key);
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$value = $_items[$key];
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} else {
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common_log(LOG_INFO, 'Cache MISS for key ' . $key);
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}
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Event::handle('EndCacheGet', array($key, &$value));
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}
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return $value;
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}
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function set($key, $value, $flag=null, $expiry=null)
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{
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$success = false;
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if (!Event::handle('StartCacheSet', array(&$key, &$value, &$flag, &$expiry, &$success))) {
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common_log(LOG_INFO, 'Setting cache value for key ' . $key);
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$_items[$key] = $value;
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$success = true;
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Event::handle('EndCacheSet', array($key, $value, $flag, $expiry));
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}
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return $success;
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}
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function delete($key)
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{
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$success = false;
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if (!Event::handle('StartCacheDelete', array(&$key, &$success))) {
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common_log(LOG_INFO, 'Deleting cache value for key ' . $key);
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unset($_items[$key]);
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$success = true;
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Event::handle('EndCacheDelete', array($key));
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}
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return $success;
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}
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}
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