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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Contracts\Cache;
use Psr\Cache\CacheException;
use Psr\Cache\CacheItemInterface;
use Psr\Cache\InvalidArgumentException;
/**
* Augments PSR-6's CacheItemInterface with support for tags and metadata.
*
* @author Nicolas Grekas <p@tchwork.com>
*/
interface ItemInterface extends CacheItemInterface
{
/**
* References the Unix timestamp stating when the item will expire.
*/
const METADATA_EXPIRY = 'expiry';
/**
* References the time the item took to be created, in milliseconds.
*/
const METADATA_CTIME = 'ctime';
/**
* References the list of tags that were assigned to the item, as string[].
*/
const METADATA_TAGS = 'tags';
/**
* Adds a tag to a cache item.
*
* Tags are strings that follow the same validation rules as keys.
*
* @param string|string[] $tags A tag or array of tags
*
* @return $this
*
* @throws InvalidArgumentException When $tag is not valid
* @throws CacheException When the item comes from a pool that is not tag-aware
*/
public function tag($tags): self;
/**
* Returns a list of metadata info that were saved alongside with the cached value.
*
* See ItemInterface::METADATA_* consts for keys potentially found in the returned array.
*/
public function getMetadata(): array;
}
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