You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
282 lines
8.7 KiB
282 lines
8.7 KiB
13 years ago
|
<?php
|
||
|
|
/**
|
||
|
|
* CMemCache class file
|
||
|
|
*
|
||
|
|
* @author Qiang Xue <qiang.xue@gmail.com>
|
||
|
|
* @link http://www.yiiframework.com/
|
||
|
|
* @copyright Copyright © 2008-2011 Yii Software LLC
|
||
|
|
* @license http://www.yiiframework.com/license/
|
||
|
|
*/
|
||
|
|
|
||
|
|
/**
|
||
|
|
* CMemCache implements a cache application component based on {@link http://memcached.org/ memcached}.
|
||
|
|
*
|
||
|
|
* CMemCache can be configured with a list of memcache servers by settings
|
||
|
|
* its {@link setServers servers} property. By default, CMemCache assumes
|
||
|
|
* there is a memcache server running on localhost at port 11211.
|
||
|
|
*
|
||
|
|
* See {@link CCache} manual for common cache operations that are supported by CMemCache.
|
||
|
|
*
|
||
|
|
* Note, there is no security measure to protected data in memcache.
|
||
|
|
* All data in memcache can be accessed by any process running in the system.
|
||
|
|
*
|
||
|
|
* To use CMemCache as the cache application component, configure the application as follows,
|
||
|
|
* <pre>
|
||
|
|
* array(
|
||
|
|
* 'components'=>array(
|
||
|
|
* 'cache'=>array(
|
||
|
|
* 'class'=>'CMemCache',
|
||
|
|
* 'servers'=>array(
|
||
|
|
* array(
|
||
|
|
* 'host'=>'server1',
|
||
|
|
* 'port'=>11211,
|
||
|
|
* 'weight'=>60,
|
||
|
|
* ),
|
||
|
|
* array(
|
||
|
|
* 'host'=>'server2',
|
||
|
|
* 'port'=>11211,
|
||
|
|
* 'weight'=>40,
|
||
|
|
* ),
|
||
|
|
* ),
|
||
|
|
* ),
|
||
|
|
* ),
|
||
|
|
* )
|
||
|
|
* </pre>
|
||
|
|
* In the above, two memcache servers are used: server1 and server2.
|
||
|
|
* You can configure more properties of every server, including:
|
||
|
|
* host, port, persistent, weight, timeout, retryInterval, status.
|
||
|
|
* See {@link http://www.php.net/manual/en/function.memcache-addserver.php}
|
||
|
|
* for more details.
|
||
|
|
*
|
||
|
|
* CMemCache can also be used with {@link http://pecl.php.net/package/memcached memcached}.
|
||
|
|
* To do so, set {@link useMemcached} to be true.
|
||
|
|
*
|
||
|
|
* @property mixed $memCache The memcache instance (or memcached if {@link useMemcached} is true) used by this component.
|
||
|
|
* @property array $servers List of memcache server configurations. Each element is a {@link CMemCacheServerConfiguration}.
|
||
|
|
*
|
||
|
|
* @author Qiang Xue <qiang.xue@gmail.com>
|
||
|
|
* @version $Id$
|
||
|
|
* @package system.caching
|
||
|
|
* @since 1.0
|
||
|
|
*/
|
||
|
|
class CMemCache extends CCache
|
||
|
|
{
|
||
|
|
/**
|
||
|
|
* @var boolean whether to use memcached or memcache as the underlying caching extension.
|
||
|
|
* If true {@link http://pecl.php.net/package/memcached memcached} will be used.
|
||
|
|
* If false {@link http://pecl.php.net/package/memcache memcache}. will be used.
|
||
|
|
* Defaults to false.
|
||
|
|
*/
|
||
|
|
public $useMemcached=false;
|
||
|
|
/**
|
||
|
|
* @var Memcache the Memcache instance
|
||
|
|
*/
|
||
|
|
private $_cache=null;
|
||
|
|
/**
|
||
|
|
* @var array list of memcache server configurations
|
||
|
|
*/
|
||
|
|
private $_servers=array();
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Initializes this application component.
|
||
|
|
* This method is required by the {@link IApplicationComponent} interface.
|
||
|
|
* It creates the memcache instance and adds memcache servers.
|
||
|
|
* @throws CException if memcache extension is not loaded
|
||
|
|
*/
|
||
|
|
public function init()
|
||
|
|
{
|
||
|
|
parent::init();
|
||
|
|
$servers=$this->getServers();
|
||
|
|
$cache=$this->getMemCache();
|
||
|
|
if(count($servers))
|
||
|
|
{
|
||
|
|
foreach($servers as $server)
|
||
|
|
{
|
||
|
|
if($this->useMemcached)
|
||
|
|
$cache->addServer($server->host,$server->port,$server->weight);
|
||
|
|
else
|
||
|
|
$cache->addServer($server->host,$server->port,$server->persistent,$server->weight,$server->timeout,$server->status);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else
|
||
|
|
$cache->addServer('localhost',11211);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @throws CException if extension isn't loaded
|
||
|
|
* @return Memcache|Memcached the memcache instance (or memcached if {@link useMemcached} is true) used by this component.
|
||
|
|
*/
|
||
|
|
public function getMemCache()
|
||
|
|
{
|
||
|
|
if($this->_cache!==null)
|
||
|
|
return $this->_cache;
|
||
|
|
else
|
||
|
|
{
|
||
|
|
$extension=$this->useMemcached ? 'memcached' : 'memcache';
|
||
|
|
if(!extension_loaded($extension))
|
||
|
|
throw new CException(Yii::t('yii',"CMemCache requires PHP $extension extension to be loaded."));
|
||
|
|
return $this->_cache=$this->useMemcached ? new Memcached : new Memcache;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @return array list of memcache server configurations. Each element is a {@link CMemCacheServerConfiguration}.
|
||
|
|
*/
|
||
|
|
public function getServers()
|
||
|
|
{
|
||
|
|
return $this->_servers;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @param array $config list of memcache server configurations. Each element must be an array
|
||
|
|
* with the following keys: host, port, persistent, weight, timeout, retryInterval, status.
|
||
|
|
* @see http://www.php.net/manual/en/function.Memcache-addServer.php
|
||
|
|
*/
|
||
|
|
public function setServers($config)
|
||
|
|
{
|
||
|
|
foreach($config as $c)
|
||
|
|
$this->_servers[]=new CMemCacheServerConfiguration($c);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Retrieves a value from cache with a specified key.
|
||
|
|
* This is the implementation of the method declared in the parent class.
|
||
|
|
* @param string $key a unique key identifying the cached value
|
||
|
|
* @return string the value stored in cache, false if the value is not in the cache or expired.
|
||
|
|
*/
|
||
|
|
protected function getValue($key)
|
||
|
|
{
|
||
|
|
return $this->_cache->get($key);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Retrieves multiple values from cache with the specified keys.
|
||
|
|
* @param array $keys a list of keys identifying the cached values
|
||
|
|
* @return array a list of cached values indexed by the keys
|
||
|
|
*/
|
||
|
|
protected function getValues($keys)
|
||
|
|
{
|
||
|
|
return $this->useMemcached ? $this->_cache->getMulti($keys) : $this->_cache->get($keys);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Stores a value identified by a key in cache.
|
||
|
|
* This is the implementation of the method declared in the parent class.
|
||
|
|
*
|
||
|
|
* @param string $key the key identifying the value to be cached
|
||
|
|
* @param string $value the value to be cached
|
||
|
|
* @param integer $expire the number of seconds in which the cached value will expire. 0 means never expire.
|
||
|
|
* @return boolean true if the value is successfully stored into cache, false otherwise
|
||
|
|
*/
|
||
|
|
protected function setValue($key,$value,$expire)
|
||
|
|
{
|
||
|
|
if($expire>0)
|
||
|
|
$expire+=time();
|
||
|
|
else
|
||
|
|
$expire=0;
|
||
|
|
|
||
|
|
return $this->useMemcached ? $this->_cache->set($key,$value,$expire) : $this->_cache->set($key,$value,0,$expire);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Stores a value identified by a key into cache if the cache does not contain this key.
|
||
|
|
* This is the implementation of the method declared in the parent class.
|
||
|
|
*
|
||
|
|
* @param string $key the key identifying the value to be cached
|
||
|
|
* @param string $value the value to be cached
|
||
|
|
* @param integer $expire the number of seconds in which the cached value will expire. 0 means never expire.
|
||
|
|
* @return boolean true if the value is successfully stored into cache, false otherwise
|
||
|
|
*/
|
||
|
|
protected function addValue($key,$value,$expire)
|
||
|
|
{
|
||
|
|
if($expire>0)
|
||
|
|
$expire+=time();
|
||
|
|
else
|
||
|
|
$expire=0;
|
||
|
|
|
||
|
|
return $this->useMemcached ? $this->_cache->add($key,$value,$expire) : $this->_cache->add($key,$value,0,$expire);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Deletes a value with the specified key from cache
|
||
|
|
* This is the implementation of the method declared in the parent class.
|
||
|
|
* @param string $key the key of the value to be deleted
|
||
|
|
* @return boolean if no error happens during deletion
|
||
|
|
*/
|
||
|
|
protected function deleteValue($key)
|
||
|
|
{
|
||
|
|
return $this->_cache->delete($key, 0);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Deletes all values from cache.
|
||
|
|
* This is the implementation of the method declared in the parent class.
|
||
|
|
* @return boolean whether the flush operation was successful.
|
||
|
|
* @since 1.1.5
|
||
|
|
*/
|
||
|
|
protected function flushValues()
|
||
|
|
{
|
||
|
|
return $this->_cache->flush();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* CMemCacheServerConfiguration represents the configuration data for a single memcache server.
|
||
|
|
*
|
||
|
|
* See {@link http://www.php.net/manual/en/function.Memcache-addServer.php}
|
||
|
|
* for detailed explanation of each configuration property.
|
||
|
|
*
|
||
|
|
* @author Qiang Xue <qiang.xue@gmail.com>
|
||
|
|
* @version $Id$
|
||
|
|
* @package system.caching
|
||
|
|
* @since 1.0
|
||
|
|
*/
|
||
|
|
class CMemCacheServerConfiguration extends CComponent
|
||
|
|
{
|
||
|
|
/**
|
||
|
|
* @var string memcache server hostname or IP address
|
||
|
|
*/
|
||
|
|
public $host;
|
||
|
|
/**
|
||
|
|
* @var integer memcache server port
|
||
|
|
*/
|
||
|
|
public $port=11211;
|
||
|
|
/**
|
||
|
|
* @var boolean whether to use a persistent connection
|
||
|
|
*/
|
||
|
|
public $persistent=true;
|
||
|
|
/**
|
||
|
|
* @var integer probability of using this server among all servers.
|
||
|
|
*/
|
||
|
|
public $weight=1;
|
||
|
|
/**
|
||
|
|
* @var integer value in seconds which will be used for connecting to the server
|
||
|
|
*/
|
||
|
|
public $timeout=15;
|
||
|
|
/**
|
||
|
|
* @var integer how often a failed server will be retried (in seconds)
|
||
|
|
*/
|
||
|
|
public $retryInterval=15;
|
||
|
|
/**
|
||
|
|
* @var boolean if the server should be flagged as online upon a failure
|
||
|
|
*/
|
||
|
|
public $status=true;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Constructor.
|
||
|
|
* @param array $config list of memcache server configurations.
|
||
|
|
* @throws CException if the configuration is not an array
|
||
|
|
*/
|
||
|
|
public function __construct($config)
|
||
|
|
{
|
||
|
|
if(is_array($config))
|
||
|
|
{
|
||
|
|
foreach($config as $key=>$value)
|
||
|
|
$this->$key=$value;
|
||
|
|
if($this->host===null)
|
||
|
|
throw new CException(Yii::t('yii','CMemCache server configuration must have "host" value.'));
|
||
|
|
}
|
||
|
|
else
|
||
|
|
throw new CException(Yii::t('yii','CMemCache server configuration must be an array.'));
|
||
|
|
}
|
||
|
|
}
|