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