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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* This code is partially based on the Rack-Cache library by Ryan Tomayko,
* which is released under the MIT license.
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\HttpKernel\HttpCache;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
/**
* Interface implemented by HTTP cache stores.
*
* @author Fabien Potencier <fabien@symfony.com>
*/
interface StoreInterface
{
/**
* Locates a cached Response for the Request provided.
*
* @param Request $request A Request instance
*
* @return Response|null A Response instance, or null if no cache entry was found
*/
public function lookup(Request $request);
/**
* Writes a cache entry to the store for the given Request and Response.
*
* Existing entries are read and any that match the response are removed. This
* method calls write with the new list of cache entries.
*
* @param Request $request A Request instance
* @param Response $response A Response instance
*
* @return string The key under which the response is stored
*/
public function write(Request $request, Response $response);
/**
* Invalidates all cache entries that match the request.
*
* @param Request $request A Request instance
*/
public function invalidate(Request $request);
/**
* Locks the cache for a given Request.
*
* @param Request $request A Request instance
*
* @return Boolean|string true if the lock is acquired, the path to the current lock otherwise
*/
public function lock(Request $request);
/**
* Releases the lock for the given Request.
*
* @param Request $request A Request instance
*
* @return Boolean False if the lock file does not exist or cannot be unlocked, true otherwise
*/
public function unlock(Request $request);
/**
* Returns whether or not a lock exists.
*
* @param Request $request A Request instance
*
* @return Boolean true if lock exists, false otherwise
*/
public function isLocked(Request $request);
/**
* Purges data for the given URL.
*
* @param string $url A URL
*
* @return Boolean true if the URL exists and has been purged, false otherwise
*/
public function purge($url);
/**
* Cleanups storage.
*/
public function cleanup();
}