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StoreInterface.php
01 <?php
02
03 /*
04 * This file is part of the Symfony package.
05 *
06 * (c) Fabien Potencier <fabien@symfony.com>
07 *
08 * This code is partially based on the Rack-Cache library by Ryan Tomayko,
09 * which is released under the MIT license.
10 *
11 * For the full copyright and license information, please view the LICENSE
12 * file that was distributed with this source code.
13 */
14
15 namespace Symfony\Component\HttpKernel\HttpCache;
16
17 use Symfony\Component\HttpFoundation\Request;
18 use Symfony\Component\HttpFoundation\Response;
19
20 /**
21 * Interface implemented by HTTP cache stores.
22 *
23 * @author Fabien Potencier <fabien@symfony.com>
24 */
25 interface StoreInterface
26 {
27 /**
28 * Locates a cached Response for the Request provided.
29 *
30 * @return Response|null A Response instance, or null if no cache entry was found
31 */
32 public function lookup(Request $request);
33
34 /**
35 * Writes a cache entry to the store for the given Request and Response.
36 *
37 * Existing entries are read and any that match the response are removed. This
38 * method calls write with the new list of cache entries.
39 *
40 * @return string The key under which the response is stored
41 */
42 public function write(Request $request, Response $response);
43
44 /**
45 * Invalidates all cache entries that match the request.
46 */
47 public function invalidate(Request $request);
48
49 /**
50 * Locks the cache for a given Request.
51 *
52 * @return bool|string true if the lock is acquired, the path to the current lock otherwise
53 */
54 public function lock(Request $request);
55
56 /**
57 * Releases the lock for the given Request.
58 *
59 * @return bool False if the lock file does not exist or cannot be unlocked, true otherwise
60 */
61 public function unlock(Request $request);
62
63 /**
64 * Returns whether or not a lock exists.
65 *
66 * @return bool true if lock exists, false otherwise
67 */
68 public function isLocked(Request $request);
69
70 /**
71 * Purges data for the given URL.
72 *
73 * @param string $url A URL
74 *
75 * @return bool true if the URL exists and has been purged, false otherwise
76 */
77 public function purge($url);
78
79 /**
80 * Cleanups storage.
81 */
82 public function cleanup();
83 }
84