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<?php
/**
* @link http://www.yiiframework.com/
* @copyright Copyright (c) 2008 Yii Software LLC
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* @license http://www.yiiframework.com/license/
*/
namespace yii\caching;
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/**
* DummyCache is a placeholder cache component.
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*
* 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
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* non-caching mode to caching mode.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @since 2.0
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*/
class DummyCache extends Cache
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{
/**
* Retrieves a value from cache with a specified key.
* This is the implementation of the method declared in the parent class.
* @param string $key a unique key identifying the cached value
* @return string|boolean the value stored in cache, false if the value is not in the cache or expired.
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*/
protected function getValue($key)
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{
return false;
}
/**
* Stores a value identified by a key in cache.
* This is the implementation of the method declared in the parent class.
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*
* @param string $key the key identifying the value to be cached
* @param string $value the value to be cached
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* @param integer $expire the number of seconds in which the cached value will expire. 0 means never expire.
* @return boolean true if the value is successfully stored into cache, false otherwise
*/
protected function setValue($key, $value, $expire)
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{
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 string $value the value to be cached
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* @param integer $expire the number of seconds in which the cached value will expire. 0 means never expire.
* @return boolean true if the value is successfully stored into cache, false otherwise
*/
protected function addValue($key, $value, $expire)
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{
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 $key the key of the value to be deleted
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* @return boolean if no error happens during deletion
*/
protected function deleteValue($key)
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{
return true;
}
/**
* Deletes all values from cache.
* This is the implementation of the method declared in the parent class.
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* @return boolean whether the flush operation was successful.
*/
protected function flushValues()
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{
return true;
}
}