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<?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');
public $compressThreshold = 20480;
public $compressMinSaving = 0.2;
public $persistent = null;
/**
* Initialize the plugin
*
* Note that onStartCacheGet() may have been called before this!
*
* @return boolean flag value
*/
function onInitializePlugin()
{
if (is_null($this->persistent)) {
$this->persistent = (php_sapi_name() == 'cli') ? false : true;
}
$this->_ensureConn();
return true;
}
/**
* Get a value associated with a key
*
* The value should have been set previously.
*
* @param string &$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($key));
return false;
}
function onStartCacheReconnect(&$success)
{
if (empty($this->_conn)) {
// nothing to do
return true;
}
if ($this->persistent) {
common_log(LOG_ERR, "Cannot close persistent memcached connection");
$success = false;
} else {
common_log(LOG_INFO, "Closing memcached connection");
$success = $this->_conn->close();
$this->_conn = null;
}
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, $this->persistent);
}
} else {
$this->_conn->addServer($this->servers, $this->persistent);
list($host, $port) = explode(';', $this->servers);
if (empty($port)) {
$port = 11211;
}
$this->_conn->addServer($host, $port, $this->persistent);
}
// Compress items stored in the cache if they're over threshold in size
// (default 2KiB) and the compression would save more than min savings
// ratio (default 0.2).
// Allows the cache to store objects larger than 1MB (if they
// compress to less than 1MB), and improves cache memory efficiency.
$this->_conn->setCompressThreshold($this->compressThreshold,
$this->compressMinSaving);
}
}
function onPluginVersion(&$versions)
{
$versions[] = array('name' => 'Memcache',
'version' => STATUSNET_VERSION,
'author' => 'Evan Prodromou, Craig Andrews',
'homepage' => 'http://status.net/wiki/Plugin:Memcache',
'rawdescription' =>
_m('Use <a href="http://memcached.org/">Memcached</a> to cache query results.'));
return true;
}
}
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