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-rw-r--r--plugins/MemcachePlugin.php162
1 files changed, 162 insertions, 0 deletions
diff --git a/plugins/MemcachePlugin.php b/plugins/MemcachePlugin.php
new file mode 100644
index 000000000..acbec135e
--- /dev/null
+++ b/plugins/MemcachePlugin.php
@@ -0,0 +1,162 @@
+<?php
+/**
+ * StatusNet - the distributed open-source microblogging tool
+ * Copyright (C) 2009, StatusNet, Inc.
+ *
+ * Plugin to implement cache interface for memcache
+ *
+ * PHP version 5
+ *
+ * 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/
+ */
+
+if (!defined('STATUSNET')) {
+ // This check helps protect against security problems;
+ // your code file can't be executed directly from the web.
+ exit(1);
+}
+
+/**
+ * A plugin to use memcache for the cache interface
+ *
+ * This used to be encoded as config-variable options in the core code;
+ * it's now broken out to a separate plugin. The same interface can be
+ * implemented by other plugins.
+ *
+ * @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/
+ */
+
+class MemcachePlugin extends Plugin
+{
+ private $_conn = null;
+ public $servers = array('127.0.0.1;11211');
+
+ /**
+ * Initialize the plugin
+ *
+ * Note that onStartCacheGet() may have been called before this!
+ *
+ * @return boolean flag value
+ */
+
+ function onInitializePlugin()
+ {
+ $this->_ensureConn();
+ return true;
+ }
+
+ /**
+ * Get a value associated with a key
+ *
+ * The value should have been set previously.
+ *
+ * @param string &$key in; Lookup key
+ * @param mixed &$value out; value associated with key
+ *
+ * @return boolean hook success
+ */
+
+ function onStartCacheGet(&$key, &$value)
+ {
+ $this->_ensureConn();
+ $value = $this->_conn->get($key);
+ Event::handle('EndCacheGet', array($key, &$value));
+ return false;
+ }
+
+ /**
+ * Associate a value with a key
+ *
+ * @param string &$key in; Key to use for lookups
+ * @param mixed &$value in; Value to associate
+ * @param integer &$flag in; Flag (passed through to Memcache)
+ * @param integer &$expiry in; Expiry (passed through to Memcache)
+ * @param boolean &$success out; Whether the set was successful
+ *
+ * @return boolean hook success
+ */
+
+ function onStartCacheSet(&$key, &$value, &$flag, &$expiry, &$success)
+ {
+ $this->_ensureConn();
+ $success = $this->_conn->set($key, $value, $flag, $expiry);
+ Event::handle('EndCacheSet', array($key, $value, $flag,
+ $expiry));
+ return false;
+ }
+
+ /**
+ * Delete a value associated with a key
+ *
+ * @param string &$key in; Key to lookup
+ * @param boolean &$success out; whether it worked
+ *
+ * @return boolean hook success
+ */
+
+ function onStartCacheDelete(&$key, &$success)
+ {
+ $this->_ensureConn();
+ $success = $this->_conn->delete($key);
+ Event::handle('EndCacheDelete', array($key));
+ return false;
+ }
+
+ /**
+ * Ensure that a connection exists
+ *
+ * Checks the instance $_conn variable and connects
+ * if it is empty.
+ *
+ * @return void
+ */
+
+ private function _ensureConn()
+ {
+ if (empty($this->_conn)) {
+ $this->_conn = new Memcache();
+
+ if (is_array($this->servers)) {
+ foreach ($this->servers as $server) {
+ list($host, $port) = explode(';', $server);
+ if (empty($port)) {
+ $port = 11211;
+ }
+
+ $this->_conn->addServer($host, $port);
+ }
+ } else {
+ $this->_conn->addServer($this->servers);
+ list($host, $port) = explode(';', $this->servers);
+ if (empty($port)) {
+ $port = 11211;
+ }
+ $this->_conn->addServer($host, $port);
+ }
+ }
+ }
+}
+