91 lines
2.7 KiB
PHP
91 lines
2.7 KiB
PHP
<?php
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namespace Doctrine\Common\Cache;
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/**
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* Interface for cache drivers.
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*
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* @link www.doctrine-project.org
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*/
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interface Cache
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{
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public const STATS_HITS = 'hits';
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public const STATS_MISSES = 'misses';
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public const STATS_UPTIME = 'uptime';
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public const STATS_MEMORY_USAGE = 'memory_usage';
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public const STATS_MEMORY_AVAILABLE = 'memory_available';
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/**
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* Only for backward compatibility (may be removed in next major release)
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*
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* @deprecated
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*/
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public const STATS_MEMORY_AVAILIABLE = 'memory_available';
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/**
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* Fetches an entry from the cache.
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*
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* @param string $id The id of the cache entry to fetch.
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*
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* @return mixed The cached data or FALSE, if no cache entry exists for the given id.
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*/
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public function fetch($id);
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/**
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* Tests if an entry exists in the cache.
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*
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* @param string $id The cache id of the entry to check for.
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*
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* @return bool TRUE if a cache entry exists for the given cache id, FALSE otherwise.
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*/
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public function contains($id);
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/**
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* Puts data into the cache.
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*
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* If a cache entry with the given id already exists, its data will be replaced.
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*
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* @param string $id The cache id.
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* @param mixed $data The cache entry/data.
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* @param int $lifeTime The lifetime in number of seconds for this cache entry.
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* If zero (the default), the entry never expires (although it may be deleted from the cache
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* to make place for other entries).
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*
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* @return bool TRUE if the entry was successfully stored in the cache, FALSE otherwise.
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*/
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public function save($id, $data, $lifeTime = 0);
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/**
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* Deletes a cache entry.
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*
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* @param string $id The cache id.
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*
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* @return bool TRUE if the cache entry was successfully deleted, FALSE otherwise.
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* Deleting a non-existing entry is considered successful.
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*/
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public function delete($id);
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/**
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* Retrieves cached information from the data store.
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*
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* The server's statistics array has the following values:
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*
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* - <b>hits</b>
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* Number of keys that have been requested and found present.
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*
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* - <b>misses</b>
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* Number of items that have been requested and not found.
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*
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* - <b>uptime</b>
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* Time that the server is running.
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*
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* - <b>memory_usage</b>
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* Memory used by this server to store items.
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*
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* - <b>memory_available</b>
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* Memory allowed to use for storage.
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*
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* @return array|null An associative array with server's statistics if available, NULL otherwise.
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*/
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public function getStats();
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}
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