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<?php |
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/** |
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* @link http://www.yiiframework.com/ |
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* @copyright Copyright (c) 2008 Yii Software LLC |
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* @license http://www.yiiframework.com/license/ |
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*/ |
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namespace yii\web; |
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use Yii; |
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use yii\caching\Cache; |
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use yii\di\Instance; |
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/** |
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* CacheSession implements a session component using cache as storage medium. |
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* |
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* The cache being used can be any cache application component. |
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* The ID of the cache application component is specified via [[cache]], which defaults to 'cache'. |
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* |
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* Beware, by definition cache storage are volatile, which means the data stored on them |
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* may be swapped out and get lost. Therefore, you must make sure the cache used by this component |
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* is NOT volatile. If you want to use database as storage medium, [[DbSession]] is a better choice. |
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* |
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* The following example shows how you can configure the application to use CacheSession: |
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* Add the following to your application config under `components`: |
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* |
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* ```php |
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* 'session' => [ |
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* 'class' => 'yii\web\CacheSession', |
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* // 'cache' => 'mycache', |
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* ] |
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* ``` |
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* |
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* @property bool $useCustomStorage Whether to use custom storage. This property is read-only. |
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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 CacheSession extends Session |
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{ |
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/** |
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* @var Cache|array|string the cache object or the application component ID of the cache object. |
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* The session data will be stored using this cache object. |
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* |
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* After the CacheSession object is created, if you want to change this property, |
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* you should only assign it with a cache object. |
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* |
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* Starting from version 2.0.2, this can also be a configuration array for creating the object. |
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*/ |
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public $cache = 'cache'; |
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/** |
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* Initializes the application component. |
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*/ |
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public function init() |
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{ |
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parent::init(); |
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$this->cache = Instance::ensure($this->cache, Cache::className()); |
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} |
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/** |
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* Returns a value indicating whether to use custom session storage. |
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* This method overrides the parent implementation and always returns true. |
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* @return bool whether to use custom storage. |
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*/ |
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public function getUseCustomStorage() |
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{ |
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return true; |
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} |
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/** |
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* Session read handler. |
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* @internal Do not call this method directly. |
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* @param string $id session ID |
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* @return string the session data |
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*/ |
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public function readSession($id) |
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{ |
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$data = $this->cache->get($this->calculateKey($id)); |
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return $data === false ? '' : $data; |
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} |
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/** |
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* Session write handler. |
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* @internal Do not call this method directly. |
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* @param string $id session ID |
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* @param string $data session data |
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* @return bool whether session write is successful |
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*/ |
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public function writeSession($id, $data) |
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{ |
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return $this->cache->set($this->calculateKey($id), $data, $this->getTimeout()); |
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} |
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/** |
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* Session destroy handler. |
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* @internal Do not call this method directly. |
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* @param string $id session ID |
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* @return bool whether session is destroyed successfully |
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*/ |
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public function destroySession($id) |
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{ |
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$cacheId = $this->calculateKey($id); |
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if ($this->cache->exists($cacheId) === false) { |
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return true; |
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} |
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return $this->cache->delete($cacheId); |
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} |
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/** |
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* Generates a unique key used for storing session data in cache. |
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* @param string $id session variable name |
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* @return mixed a safe cache key associated with the session variable name |
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*/ |
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protected function calculateKey($id) |
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{ |
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return [__CLASS__, $id]; |
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} |
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} |
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rob006 /
yii2-dev
