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<?php
/**
* CEAcceleratorCache class file
*
* @author Steffen Dietz <steffo.dietz[at]googlemail[dot]com>
* @link http://www.yiiframework.com/
* @copyright 2008-2013 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/

/**
* CEAcceleratorCache implements a cache application module based on {@link http://eaccelerator.net/ eaccelerator}.
*
* To use this application component, the eAccelerator PHP extension must be loaded.
*
* See {@link CCache} manual for common cache operations that are supported by CEAccelerator.
*
* Please note that as of v0.9.6, eAccelerator no longer supports data caching.
* This means if you still want to use this component, your eAccelerator should be of 0.9.5.x or lower version.
*
* @author Steffen Dietz <steffo.dietz[at]googlemail[dot]com>
* @package system.caching
*/
class CEAcceleratorCache extends CCache
{
/**
* Initializes this application component.
* This method is required by the {@link IApplicationComponent} interface.
* It checks the availability of eAccelerator.
* @throws CException if eAccelerator extension is not loaded, is disabled or the cache functions are not compiled in.
*/
public function init()
{
parent::init();
if(!function_exists('eaccelerator_get'))
throw new CException(Yii::t('yii','CEAcceleratorCache requires PHP eAccelerator extension to be loaded, enabled or compiled with the "--with-eaccelerator-shared-memory" option.'));
}

/**
* Retrieves a value from cache with a specified key.
* This is the implementation of the method declared in the parent class.
* @param string $key a unique key identifying the cached value
* @return string|boolean the value stored in cache, false if the value is not in the cache or expired.
*/
protected function getValue($key)
{
$result = eaccelerator_get($key);
return $result !== NULL ? $result : 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 eaccelerator_put($key,$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 (NULL === eaccelerator_get($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 eaccelerator_rm($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()
{
// first, remove expired content from cache
eaccelerator_gc();
// now, remove leftover cache-keys
$keys = eaccelerator_list_keys();
foreach($keys as $key)
$this->deleteValue(substr($key['name'], 1));
return true;
}
}
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