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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 * @param Request $request A Request instance
31 *
32 * @return Response|null A Response instance, or null if no cache entry was found
33 */
34 public function lookup(Request $request);
35
36 /**
37 * Writes a cache entry to the store for the given Request and Response.
38 *
39 * Existing entries are read and any that match the response are removed. This
40 * method calls write with the new list of cache entries.
41 *
42 * @param Request $request A Request instance
43 * @param Response $response A Response instance
44 *
45 * @return string The key under which the response is stored
46 */
47 public function write(Request $request, Response $response);
48
49 /**
50 * Invalidates all cache entries that match the request.
51 *
52 * @param Request $request A Request instance
53 */
54 public function invalidate(Request $request);
55
56 /**
57 * Locks the cache for a given Request.
58 *
59 * @param Request $request A Request instance
60 *
61 * @return bool|string true if the lock is acquired, the path to the current lock otherwise
62 */
63 public function lock(Request $request);
64
65 /**
66 * Releases the lock for the given Request.
67 *
68 * @param Request $request A Request instance
69 *
70 * @return bool False if the lock file does not exist or cannot be unlocked, true otherwise
71 */
72 public function unlock(Request $request);
73
74 /**
75 * Returns whether or not a lock exists.
76 *
77 * @param Request $request A Request instance
78 *
79 * @return bool true if lock exists, false otherwise
80 */
81 public function isLocked(Request $request);
82
83 /**
84 * Purges data for the given URL.
85 *
86 * @param string $url A URL
87 *
88 * @return bool true if the URL exists and has been purged, false otherwise
89 */
90 public function purge($url);
91
92 /**
93 * Cleanups storage.
94 */
95 public function cleanup();
96 }
97