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282 lines
8.7 KiB
282 lines
8.7 KiB
14 years ago
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<?php
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/**
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* CMemCache class file
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*
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* @author Qiang Xue <qiang.xue@gmail.com>
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* @link http://www.yiiframework.com/
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* @copyright Copyright © 2008-2011 Yii Software LLC
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* @license http://www.yiiframework.com/license/
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*/
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/**
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* CMemCache implements a cache application component based on {@link http://memcached.org/ memcached}.
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*
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* CMemCache can be configured with a list of memcache servers by settings
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* its {@link setServers servers} property. By default, CMemCache assumes
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* there is a memcache server running on localhost at port 11211.
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*
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* See {@link CCache} manual for common cache operations that are supported by CMemCache.
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*
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* Note, there is no security measure to protected data in memcache.
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* All data in memcache can be accessed by any process running in the system.
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*
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* To use CMemCache as the cache application component, configure the application as follows,
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* <pre>
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* array(
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* 'components'=>array(
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* 'cache'=>array(
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* 'class'=>'CMemCache',
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* 'servers'=>array(
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* array(
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* 'host'=>'server1',
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* 'port'=>11211,
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* 'weight'=>60,
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* ),
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* array(
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* 'host'=>'server2',
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* 'port'=>11211,
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* 'weight'=>40,
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* ),
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* ),
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* ),
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* ),
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* )
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* </pre>
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* In the above, two memcache servers are used: server1 and server2.
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* You can configure more properties of every server, including:
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* host, port, persistent, weight, timeout, retryInterval, status.
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* See {@link http://www.php.net/manual/en/function.memcache-addserver.php}
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* for more details.
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*
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* CMemCache can also be used with {@link http://pecl.php.net/package/memcached memcached}.
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* To do so, set {@link useMemcached} to be true.
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*
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* @property mixed $memCache The memcache instance (or memcached if {@link useMemcached} is true) used by this component.
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* @property array $servers List of memcache server configurations. Each element is a {@link CMemCacheServerConfiguration}.
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*
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* @author Qiang Xue <qiang.xue@gmail.com>
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* @version $Id$
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* @package system.caching
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* @since 1.0
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*/
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class CMemCache extends CCache
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{
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/**
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* @var boolean whether to use memcached or memcache as the underlying caching extension.
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* If true {@link http://pecl.php.net/package/memcached memcached} will be used.
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* If false {@link http://pecl.php.net/package/memcache memcache}. will be used.
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* Defaults to false.
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*/
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public $useMemcached=false;
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/**
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* @var Memcache the Memcache instance
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*/
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private $_cache=null;
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/**
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* @var array list of memcache server configurations
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*/
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private $_servers=array();
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/**
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* Initializes this application component.
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* This method is required by the {@link IApplicationComponent} interface.
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* It creates the memcache instance and adds memcache servers.
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* @throws CException if memcache extension is not loaded
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*/
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public function init()
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{
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parent::init();
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$servers=$this->getServers();
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$cache=$this->getMemCache();
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if(count($servers))
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{
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foreach($servers as $server)
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{
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if($this->useMemcached)
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$cache->addServer($server->host,$server->port,$server->weight);
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else
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$cache->addServer($server->host,$server->port,$server->persistent,$server->weight,$server->timeout,$server->status);
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}
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}
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else
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$cache->addServer('localhost',11211);
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}
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/**
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* @throws CException if extension isn't loaded
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* @return Memcache|Memcached the memcache instance (or memcached if {@link useMemcached} is true) used by this component.
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*/
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public function getMemCache()
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{
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if($this->_cache!==null)
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return $this->_cache;
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else
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{
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$extension=$this->useMemcached ? 'memcached' : 'memcache';
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if(!extension_loaded($extension))
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throw new CException(Yii::t('yii',"CMemCache requires PHP $extension extension to be loaded."));
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return $this->_cache=$this->useMemcached ? new Memcached : new Memcache;
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}
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}
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/**
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* @return array list of memcache server configurations. Each element is a {@link CMemCacheServerConfiguration}.
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*/
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public function getServers()
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{
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return $this->_servers;
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}
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/**
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* @param array $config list of memcache server configurations. Each element must be an array
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* with the following keys: host, port, persistent, weight, timeout, retryInterval, status.
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* @see http://www.php.net/manual/en/function.Memcache-addServer.php
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*/
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public function setServers($config)
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{
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foreach($config as $c)
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$this->_servers[]=new CMemCacheServerConfiguration($c);
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}
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/**
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* Retrieves a value from cache with a specified key.
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* This is the implementation of the method declared in the parent class.
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* @param string $key a unique key identifying the cached value
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* @return string the value stored in cache, false if the value is not in the cache or expired.
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*/
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protected function getValue($key)
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{
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return $this->_cache->get($key);
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}
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/**
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* Retrieves multiple values from cache with the specified keys.
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* @param array $keys a list of keys identifying the cached values
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* @return array a list of cached values indexed by the keys
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*/
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protected function getValues($keys)
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{
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return $this->useMemcached ? $this->_cache->getMulti($keys) : $this->_cache->get($keys);
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}
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/**
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* Stores a value identified by a key in cache.
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* This is the implementation of the method declared in the parent class.
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*
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* @param string $key the key identifying the value to be cached
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* @param string $value the value to be cached
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* @param integer $expire the number of seconds in which the cached value will expire. 0 means never expire.
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* @return boolean true if the value is successfully stored into cache, false otherwise
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*/
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protected function setValue($key,$value,$expire)
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{
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if($expire>0)
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$expire+=time();
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else
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$expire=0;
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return $this->useMemcached ? $this->_cache->set($key,$value,$expire) : $this->_cache->set($key,$value,0,$expire);
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}
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/**
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* Stores a value identified by a key into cache if the cache does not contain this key.
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* This is the implementation of the method declared in the parent class.
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*
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* @param string $key the key identifying the value to be cached
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* @param string $value the value to be cached
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* @param integer $expire the number of seconds in which the cached value will expire. 0 means never expire.
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* @return boolean true if the value is successfully stored into cache, false otherwise
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*/
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protected function addValue($key,$value,$expire)
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{
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if($expire>0)
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$expire+=time();
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else
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$expire=0;
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return $this->useMemcached ? $this->_cache->add($key,$value,$expire) : $this->_cache->add($key,$value,0,$expire);
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}
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/**
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* Deletes a value with the specified key from cache
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* This is the implementation of the method declared in the parent class.
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* @param string $key the key of the value to be deleted
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* @return boolean if no error happens during deletion
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*/
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protected function deleteValue($key)
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{
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return $this->_cache->delete($key, 0);
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}
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/**
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* Deletes all values from cache.
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* This is the implementation of the method declared in the parent class.
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* @return boolean whether the flush operation was successful.
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* @since 1.1.5
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*/
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protected function flushValues()
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{
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return $this->_cache->flush();
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}
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}
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/**
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* CMemCacheServerConfiguration represents the configuration data for a single memcache server.
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*
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* See {@link http://www.php.net/manual/en/function.Memcache-addServer.php}
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* for detailed explanation of each configuration property.
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*
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* @author Qiang Xue <qiang.xue@gmail.com>
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* @version $Id$
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* @package system.caching
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* @since 1.0
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*/
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class CMemCacheServerConfiguration extends CComponent
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{
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/**
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* @var string memcache server hostname or IP address
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*/
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public $host;
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/**
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* @var integer memcache server port
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*/
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public $port=11211;
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/**
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* @var boolean whether to use a persistent connection
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*/
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public $persistent=true;
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/**
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* @var integer probability of using this server among all servers.
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*/
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public $weight=1;
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/**
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* @var integer value in seconds which will be used for connecting to the server
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*/
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public $timeout=15;
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/**
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* @var integer how often a failed server will be retried (in seconds)
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*/
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public $retryInterval=15;
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/**
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* @var boolean if the server should be flagged as online upon a failure
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*/
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public $status=true;
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/**
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* Constructor.
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* @param array $config list of memcache server configurations.
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* @throws CException if the configuration is not an array
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*/
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public function __construct($config)
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{
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if(is_array($config))
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{
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foreach($config as $key=>$value)
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$this->$key=$value;
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if($this->host===null)
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throw new CException(Yii::t('yii','CMemCache server configuration must have "host" value.'));
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}
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else
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throw new CException(Yii::t('yii','CMemCache server configuration must be an array.'));
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}
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}
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