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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\caching; |
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/** |
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* TagDependency associates a cached data item with one or multiple [[tags]]. |
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* |
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* By calling [[invalidate()]], you can invalidate all cached data items that are associated with the specified tag name(s). |
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* |
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* ```php |
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* // setting multiple cache keys to store data forever and tagging them with "user-123" |
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* Yii::$app->cache->set('user_42_profile', '', 0, new TagDependency(['tags' => 'user-123'])); |
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* Yii::$app->cache->set('user_42_stats', '', 0, new TagDependency(['tags' => 'user-123'])); |
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* |
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* // invalidating all keys tagged with "user-123" |
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* TagDependency::invalidate(Yii::$app->cache, 'user-123'); |
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* ``` |
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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 TagDependency extends Dependency |
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{ |
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/** |
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* @var string|array a list of tag names for this dependency. For a single tag, you may specify it as a string. |
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*/ |
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public $tags = []; |
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/** |
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* Generates the data needed to determine if dependency has been changed. |
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* This method does nothing in this class. |
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* @param Cache $cache the cache component that is currently evaluating this dependency |
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* @return mixed the data needed to determine if dependency has been changed. |
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*/ |
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protected function generateDependencyData($cache) |
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{ |
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$timestamps = $this->getTimestamps($cache, (array) $this->tags); |
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$newKeys = []; |
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foreach ($timestamps as $key => $timestamp) { |
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if ($timestamp === false) { |
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$newKeys[] = $key; |
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} |
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} |
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if (!empty($newKeys)) { |
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$timestamps = array_merge($timestamps, static::touchKeys($cache, $newKeys)); |
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} |
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return $timestamps; |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function isChanged($cache) |
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{ |
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$timestamps = $this->getTimestamps($cache, (array) $this->tags); |
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return $timestamps !== $this->data; |
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} |
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/** |
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* Invalidates all of the cached data items that are associated with any of the specified [[tags]]. |
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* @param Cache $cache the cache component that caches the data items |
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* @param string|array $tags |
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*/ |
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public static function invalidate($cache, $tags) |
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{ |
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$keys = []; |
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foreach ((array) $tags as $tag) { |
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$keys[] = $cache->buildKey([__CLASS__, $tag]); |
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} |
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static::touchKeys($cache, $keys); |
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} |
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/** |
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* Generates the timestamp for the specified cache keys. |
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* @param Cache $cache |
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* @param string[] $keys |
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* @return array the timestamp indexed by cache keys |
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*/ |
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protected static function touchKeys($cache, $keys) |
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{ |
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$items = []; |
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$time = microtime(); |
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foreach ($keys as $key) { |
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$items[$key] = $time; |
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} |
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$cache->multiSet($items); |
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return $items; |
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} |
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/** |
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* Returns the timestamps for the specified tags. |
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* @param Cache $cache |
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* @param string[] $tags |
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* @return array the timestamps indexed by the specified tags. |
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*/ |
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protected function getTimestamps($cache, $tags) |
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{ |
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if (empty($tags)) { |
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return []; |
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} |
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$keys = []; |
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foreach ($tags as $tag) { |
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$keys[] = $cache->buildKey([__CLASS__, $tag]); |
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} |
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return $cache->multiGet($keys); |
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} |
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} |
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rob006 /
yii2-dev
