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<?php |
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declare(strict_types=1); |
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namespace Yiisoft\Cache\Dependency; |
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use Yiisoft\Cache\CacheInterface; |
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use Yiisoft\Cache\Exception\InvalidArgumentException; |
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use function json_encode; |
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use function json_last_error_msg; |
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use function md5; |
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/** |
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* TagDependency associates a cached value with one or multiple {@see TagDependency::$tags}. |
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* |
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* By calling {@see TagDependency::invalidate()}, you can invalidate all |
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* cached values 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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* $cache->getOrSet('user_42_profile', '', null, new TagDependency('user-123')); |
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* $cache->getOrSet('user_42_stats', '', null, new TagDependency('user-123')); |
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* |
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* // setting a cache key to store data and tagging them with "user-123" with the specified TTL for the tag |
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* $cache->getOrSet('user_42_profile', '', null, new TagDependency('user-123', 3600)); |
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* |
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* // invalidating all keys tagged with "user-123" |
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* TagDependency::invalidate($cache, 'user-123'); |
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* ``` |
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*/ |
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final class TagDependency extends Dependency |
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{ |
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/** |
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* @var array List of tag names for this dependency. |
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*/ |
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private array $tags; |
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/** |
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* @var int|null The TTL value of this item. null means infinity. |
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*/ |
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private ?int $ttl; |
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/** |
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* @param array|string $tags List of tag names for this dependency. |
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* For a single tag, you may specify it as a string. |
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* @param int|null $ttl The TTL value of this item. null means infinity. |
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*/ |
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public function __construct($tags, int $ttl = null) |
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{ |
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$this->tags = (array) $tags; |
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if ($ttl !== null && $ttl < 1) { |
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throw new InvalidArgumentException( |
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'TTL must be a positive number or null, to invalidate tags, use the' |
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. ' static `\Yiisoft\Cache\Dependency\TagDependency::invalidate()` method.', |
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); |
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} |
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$this->ttl = $ttl; |
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} |
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protected function generateDependencyData(CacheInterface $cache): array |
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{ |
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if (empty($this->tags)) { |
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return []; |
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} |
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$tags = []; |
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foreach ($this->tags as $tag) { |
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$tag = (string) $tag; |
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$tags[self::buildCacheKey($tag)] = $tag; |
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} |
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$cache->psr()->setMultiple($tags, $this->ttl); |
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return $tags; |
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} |
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public function isChanged(CacheInterface $cache): bool |
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{ |
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$tags = empty($this->tags) ? [] : $cache->psr()->getMultiple(self::buildCacheKeys($this->tags)); |
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return $this->data !== $tags; |
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} |
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/** |
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* Invalidates all of the cached values that are associated with any of the specified {@see tags}. |
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* |
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* @param CacheInterface $cache The cache component that caches the values. |
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* @param array|string $tags |
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*/ |
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public static function invalidate(CacheInterface $cache, $tags): void |
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{ |
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$cache->psr()->deleteMultiple(self::buildCacheKeys($tags)); |
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} |
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/** |
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* Builds a normalized cache key from a given tag, making sure it is short enough and safe |
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* for any particular cache storage. |
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* |
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* @param string $tag The tag name. |
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* |
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* @return string The cache key. |
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*/ |
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private static function buildCacheKey(string $tag): string |
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{ |
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$jsonTag = json_encode([__CLASS__, $tag]); |
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if ($jsonTag === false) { |
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throw new InvalidArgumentException('Invalid tag. ' . json_last_error_msg()); |
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} |
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return md5($jsonTag); |
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} |
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/** |
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* Builds array of keys from a given tags. |
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* |
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* @param mixed $tags |
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* |
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* @return array |
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*/ |
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private static function buildCacheKeys($tags): array |
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{ |
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$keys = []; |
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foreach ((array) $tags as $tag) { |
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$keys[] = self::buildCacheKey((string) $tag); |
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} |
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return $keys; |
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} |
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} |
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yiisoft /
cache
