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<?php
/**
* @link http://www.yiiframework.com/
* @copyright Copyright (c) 2008 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
namespace yii\caching;
/**
* DummyCache is a placeholder cache component.
*
* DummyCache does not cache anything. It is provided so that one can always configure
* a 'cache' application component and save the check of existence of `\Yii::$app->cache`.
* By replacing DummyCache with some other cache component, one can quickly switch from
* non-caching mode to caching mode.
*
* For more details and usage information on Cache, see the [guide article on caching](guide:caching-overview).
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @since 2.0
*/
class DummyCache extends Cache
{
/**
* Retrieves a value from cache with a specified key.
* This is the implementation of the method declared in the parent class.
* @param string $key a unique key identifying the cached value
* @return mixed|false the value stored in cache, false if the value is not in the cache or expired.
*/
protected function getValue($key)
{
return 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 mixed $value the value to be cached
* @param int $duration the number of seconds in which the cached value will expire. 0 means never expire.
* @return bool true if the value is successfully stored into cache, false otherwise
*/
protected function setValue($key, $value, $duration)
{
return true;
}
/**
* 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 mixed $value the value to be cached
* @param int $duration the number of seconds in which the cached value will expire. 0 means never expire.
* @return bool true if the value is successfully stored into cache, false otherwise
*/
protected function addValue($key, $value, $duration)
{
return true;
}
/**
* Deletes a value with the specified key from cache
* This is the implementation of the method declared in the parent class.
* @param string $key the key of the value to be deleted
* @return bool if no error happens during deletion
*/
protected function deleteValue($key)
{
return true;
}
/**
* Deletes all values from cache.
* This is the implementation of the method declared in the parent class.
* @return bool whether the flush operation was successful.
*/
protected function flushValues()
{
return true;
}
}
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