Make caching a plugin system

This commit is contained in:
Evan Prodromou 2010-01-02 20:26:33 -10:00
parent 7b452e4f71
commit c5d23e27a6
2 changed files with 116 additions and 28 deletions

113
lib/cache.php Normal file
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@ -0,0 +1,113 @@
<?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;
}
}

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@ -1384,42 +1384,17 @@ function common_session_token()
function common_cache_key($extra) function common_cache_key($extra)
{ {
$base_key = common_config('memcached', 'base'); return Cache::key($extra);
if (empty($base_key)) {
$base_key = common_keyize(common_config('site', 'name'));
}
return 'statusnet:' . $base_key . ':' . $extra;
} }
function common_keyize($str) function common_keyize($str)
{ {
$str = strtolower($str); return Cache::keyize($str);
$str = preg_replace('/\s/', '_', $str);
return $str;
} }
function common_memcache() function common_memcache()
{ {
static $cache = null; return Cache::instance();
if (!common_config('memcached', 'enabled')) {
return null;
} else {
if (!$cache) {
$cache = new Memcache();
$servers = common_config('memcached', 'server');
if (is_array($servers)) {
foreach($servers as $server) {
$cache->addServer($server);
}
} else {
$cache->addServer($servers);
}
$cache->setCompressThreshold(20000, 0.2);
}
return $cache;
}
} }
function common_license_terms($uri) function common_license_terms($uri)