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<?php |
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declare(strict_types=1); |
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namespace Yiisoft\Cache\Metadata; |
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use Psr\SimpleCache\CacheInterface; |
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use Yiisoft\Cache\Dependency\Dependency; |
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use Yiisoft\Cache\Exception\InvalidArgumentException; |
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use function ceil; |
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use function log; |
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use function microtime; |
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use function random_int; |
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use function sprintf; |
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use function time; |
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use const PHP_INT_MAX; |
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/** |
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* CacheItem store the metadata of cache item. |
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* |
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* @internal |
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*/ |
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final class CacheItem |
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{ |
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private string $key; |
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private ?int $expiry; |
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private ?Dependency $dependency; |
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private float $updated; |
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/** |
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* @param string $key The key that identifies the cache item. |
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* @param int|null $expiry The cache expiry. null means infinity. |
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* @param Dependency|null $dependency The cache invalidation dependency or null for none. |
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*/ |
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public function __construct(string $key, ?int $expiry, ?Dependency $dependency) |
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{ |
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$this->key = $key; |
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$this->expiry = $expiry; |
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$this->dependency = $dependency; |
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$this->updated = microtime(true); |
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} |
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/** |
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* Updates the metadata of the cache item. |
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* |
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* @param int|null $expiry The cache expiry. null means infinity. |
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* @param Dependency|null $dependency The cache invalidation dependency or null for none. |
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*/ |
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public function update(?int $expiry, ?Dependency $dependency): void |
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{ |
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$this->expiry = $expiry; |
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$this->dependency = $dependency; |
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$this->updated = microtime(true); |
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} |
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/** |
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* Returns a key that identifies the cache item. |
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* |
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* @return string The key that identifies the cache item. |
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*/ |
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public function key(): string |
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{ |
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return $this->key; |
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} |
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/** |
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* Returns a cache expiry or null that means infinity. |
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* |
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* @return int|null The cache expiry timestamp or null that means infinity. |
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*/ |
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public function expiry(): ?int |
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{ |
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return $this->expiry; |
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} |
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/** |
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* Returns a cache dependency or null if there is none. |
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* |
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* @return Dependency|null The cache dependency or null if there is none. |
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*/ |
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public function dependency(): ?Dependency |
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{ |
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return $this->dependency; |
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} |
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/** |
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* Checks whether the dependency has been changed or whether the cache expired. |
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* |
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* @param float $beta The value for calculating the range that is used for "Probably early expiration" algorithm. |
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* @param CacheInterface $cache The actual cache handler. |
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* |
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* @return bool Whether the dependency has been changed or whether the cache expired. |
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*/ |
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public function expired(float $beta, CacheInterface $cache): bool |
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{ |
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if ($beta < 0) { |
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throw new InvalidArgumentException(sprintf( |
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'Argument "$beta" must be a positive number, %f given.', |
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$beta |
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)); |
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} |
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if ($this->dependency !== null && $this->dependency->isChanged($cache)) { |
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return true; |
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} |
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if ($this->expiry === null) { |
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return false; |
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} |
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if ($this->expiry <= time()) { |
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return true; |
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} |
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$now = microtime(true); |
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$delta = ceil(1000 * ($now - $this->updated)) / 1000; |
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$expired = $now - $delta * $beta * log(random_int(1, PHP_INT_MAX) / PHP_INT_MAX); |
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return $this->expiry <= $expired; |
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} |
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} |
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yiisoft /
cache
