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