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<?php |
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/** |
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* @link https://www.yiiframework.com/ |
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* @copyright Copyright (c) 2008 Yii Software LLC |
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* @license https://www.yiiframework.com/license/ |
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*/ |
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namespace yii\caching; |
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/** |
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* DummyCache is a placeholder cache component. |
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* |
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* DummyCache does not cache anything. It is provided so that one can always configure |
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* a 'cache' application component and save the check of existence of `\Yii::$app->cache`. |
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* By replacing DummyCache with some other cache component, one can quickly switch from |
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* non-caching mode to caching mode. |
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* |
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* For more details and usage information on Cache, see the [guide article on caching](guide:caching-overview). |
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* |
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* @author Qiang Xue <[email protected]> |
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* @since 2.0 |
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*/ |
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class DummyCache extends Cache |
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{ |
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/** |
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* Retrieves a value from cache with a specified key. |
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* This is the implementation of the method declared in the parent class. |
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* @param string $key a unique key identifying the cached value |
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* @return mixed|false the value stored in cache, false if the value is not in the cache or expired. |
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*/ |
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protected function getValue($key) |
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{ |
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return false; |
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} |
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/** |
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* Stores a value identified by a key in cache. |
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* This is the implementation of the method declared in the parent class. |
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* |
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* @param string $key the key identifying the value to be cached |
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* @param mixed $value the value to be cached |
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* @param int $duration the number of seconds in which the cached value will expire. 0 means never expire. |
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* @return bool true if the value is successfully stored into cache, false otherwise |
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*/ |
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protected function setValue($key, $value, $duration) |
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{ |
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return true; |
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} |
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/** |
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* Stores a value identified by a key into cache if the cache does not contain this key. |
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* 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 |
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* @param mixed $value the value to be cached |
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* @param int $duration the number of seconds in which the cached value will expire. 0 means never expire. |
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* @return bool true if the value is successfully stored into cache, false otherwise |
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*/ |
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protected function addValue($key, $value, $duration) |
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{ |
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return true; |
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} |
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/** |
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* Deletes a value with the specified key from cache |
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* This is the implementation of the method declared in the parent class. |
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* @param string $key the key of the value to be deleted |
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* @return bool if no error happens during deletion |
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*/ |
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protected function deleteValue($key) |
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{ |
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return true; |
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} |
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/** |
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* Deletes all values from cache. |
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* This is the implementation of the method declared in the parent class. |
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* @return bool whether the flush operation was successful. |
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*/ |
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protected function flushValues() |
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{ |
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return true; |
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} |
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} |
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rob006 /
yii2-dev
