mirror of
https://github.com/EGroupware/egroupware.git
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122 lines
3.4 KiB
PHP
122 lines
3.4 KiB
PHP
<?php
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/**
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* EGroupware API: Caching provider storing data in memcached via PHP's memcache extension
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*
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* @link http://www.egroupware.org
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* @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
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* @package api
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* @subpackage cache
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* @author Ralf Becker <RalfBecker-AT-outdoor-training.de>
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* @copyright (c) 2009-12 by Ralf Becker <RalfBecker-AT-outdoor-training.de>
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* @version $Id$
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*/
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/**
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* Caching provider storing data in memcached via PHP's memcache extension
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*
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* The provider concats all $keys with '::' to get a single string.
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*
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* To use this provider set in your header.inc.php:
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* $GLOBALS['egw_info']['server']['cache_provider_instance'] = array('egw_cache_memcache','localhost'[,'otherhost:port']);
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* and optional also $GLOBALS['egw_info']['server']['cache_provider_tree'] (defaults to instance)
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*
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* You can set more then one server and specify a port, if it's not the default one 11211.
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*/
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class egw_cache_memcache extends egw_cache_provider_check implements egw_cache_provider
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{
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/**
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* Instance of Memcache
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*
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* @var Memcache
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*/
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private $memcache;
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/**
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* Flags used to store content
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*
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*/
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const STORE_FLAGS = MEMCACHE_COMPRESSED;
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/**
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* Constructor, eg. opens the connection to the backend
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*
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* @throws Exception if connection to backend could not be established
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* @param array $params eg. array('localhost'[,'localhost:11211',...])
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*/
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function __construct(array $params)
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{
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check_load_extension('memcache',true);
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$this->memcache = new Memcache();
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if (!$params) $params = array('localhost'); // some reasonable default
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$ok = false;
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foreach($params as $host_port)
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{
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list($host,$port) = explode(':',$host_port);
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if (!$port) $port = 11211; // default port
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$ok = $this->memcache->addServer($host,$port) || $ok;
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//error_log(__METHOD__."(".array2string($params).") memcache->addServer('$host',$port) = ".(int)$ok);
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}
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if (!$ok)
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{
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throw new Exception (__METHOD__.'('.array2string($params).") Can't open connection to any memcached server!");
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}
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}
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/**
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* Stores some data in the cache
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*
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* @param array $keys eg. array($level,$app,$location)
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* @param mixed $data
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* @param int $expiration=0
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* @return boolean true on success, false on error
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*/
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function set(array $keys,$data,$expiration=0)
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{
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return $this->memcache->set(self::key($keys),serialize($data),self::STORE_FLAGS,$expiration);
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}
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/**
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* Get some data from the cache
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*
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* @param array $keys eg. array($level,$app,$location)
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* @return mixed data stored or NULL if not found in cache
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*/
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function get(array $keys)
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{
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if (($data = $this->memcache->get($key=self::key($keys))) === false)
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{
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//error_log(__METHOD__."(".array2string($keys).") key='$key' NOT found!");
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return null;
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}
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//error_log(__METHOD__."(".array2string($keys).") key='$key' found ".bytes($data)." bytes).");
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return unserialize($data);
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}
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/**
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* Delete some data from the cache
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*
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* @param array $keys eg. array($level,$app,$location)
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* @return boolean true on success, false on error (eg. $key not set)
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*/
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function delete(array $keys)
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{
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// ,0 required to fix a bug in memcache extension < 3.1.1 with memcache > 1.4.3, eg. Debian 6
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// see https://bugs.php.net/bug.php?id=58943
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return $this->memcache->delete(self::key($keys), 0);
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}
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/**
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* Create a single key from $keys
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*
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* @param array $keys
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* @return string
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*/
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private function key(array $keys)
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{
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return implode('::',$keys);
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}
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}
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