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<?php
/**
* CXCache class file
*
* @author Wei Zhuo <weizhuo[at]gmail[dot]com>
* @link http://www.yiiframework.com/
* @copyright Copyright &copy; 2008-2011 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/

/**
* CXCache implements a cache application module based on {@link http://xcache.lighttpd.net/ xcache}.
*
* To use this application component, the XCache PHP extension must be loaded.
* Flush functionality will only work correctly if "xcache.admin.enable_auth" is set to "Off" in php.ini.
*
* See {@link CCache} manual for common cache operations that are supported by CXCache.
*
* @author Wei Zhuo <weizhuo[at]gmail[dot]com>
* @version $Id$
* @package system.caching
*/
class CXCache extends CCache
{
/**
* Initializes this application component.
* This method is required by the {@link IApplicationComponent} interface.
* It checks the availability of memcache.
* @throws CException if memcache extension is not loaded or is disabled.
*/
public function init()
{
parent::init();
if(!function_exists('xcache_isset'))
throw new CException(Yii::t('yii','CXCache requires PHP XCache extension to be loaded.'));
}

/**
* 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 xcache_isset($key) ? xcache_get($key) : false;
}

/**
* 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)
{
return xcache_set($key,$value,$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)
{
return !xcache_isset($key) ? $this->setValue($key,$value,$expire) : false;
}

/**
* 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 xcache_unset($key);
}

/**
* 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()
{
for($i=0, $max=xcache_count(XC_TYPE_VAR); $i<$max; $i++)
{
if(xcache_clear_cache(XC_TYPE_VAR, $i)===false)
return false;
}
return true;
}
}

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