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22 namespace Doctrine\Common\Cache;
25 * Interface for cache drivers.
27 * @license http://www.opensource.org/licenses/lgpl-license.php LGPL
28 * @link www.doctrine-project.org
30 * @author Benjamin Eberlei <kontakt@beberlei.de>
31 * @author Guilherme Blanco <guilhermeblanco@hotmail.com>
32 * @author Jonathan Wage <jonwage@gmail.com>
33 * @author Roman Borschel <roman@code-factory.org>
34 * @author Fabio B. Silva <fabio.bat.silva@gmail.com>
38 const STATS_HITS = 'hits';
39 const STATS_MISSES = 'misses';
40 const STATS_UPTIME = 'uptime';
41 const STATS_MEMORY_USAGE = 'memory_usage';
42 const STATS_MEMORY_AVAILIABLE = 'memory_available';
45 * Fetches an entry from the cache.
47 * @param string $id cache id The id of the cache entry to fetch.
48 * @return mixed The cached data or FALSE, if no cache entry exists for the given id.
53 * Test if an entry exists in the cache.
55 * @param string $id cache id The cache id of the entry to check for.
56 * @return boolean TRUE if a cache entry exists for the given cache id, FALSE otherwise.
58 function contains($id);
61 * Puts data into the cache.
63 * @param string $id The cache id.
64 * @param mixed $data The cache entry/data.
65 * @param int $lifeTime The lifetime. If != 0, sets a specific lifetime for this cache entry (0 => infinite lifeTime).
66 * @return boolean TRUE if the entry was successfully stored in the cache, FALSE otherwise.
68 function save($id, $data, $lifeTime = 0);
71 * Deletes a cache entry.
73 * @param string $id cache id
74 * @return boolean TRUE if the cache entry was successfully deleted, FALSE otherwise.
79 * Retrieves cached information from data store
81 * The server's statistics array has the following values:
84 * Number of keys that have been requested and found present.
87 * Number of items that have been requested and not found.
90 * Time that the server is running.
92 * - <b>memory_usage</b>
93 * Memory used by this server to store items.
95 * - <b>memory_available</b>
96 * Memory allowed to use for storage.
99 * @var array Associative array with server's statistics if available, NULL otherwise.