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<?php
/**
* @copyright Copyright (c) 2016, ownCloud, Inc.
*
* @author Robin Appelman <robin@icewind.nl>
*
* @license AGPL-3.0
*
* This code is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License, version 3,
* along with this program. If not, see <http://www.gnu.org/licenses/>
*
*/
namespace OCP\Files\Cache;
/**
* check the storage backends for updates and change the cache accordingly
*
* @since 9.0.0
*/
interface IWatcher {
const CHECK_NEVER = 0; // never check the underlying filesystem for updates
const CHECK_ONCE = 1; // check the underlying filesystem for updates once every request for each file
const CHECK_ALWAYS = 2; // always check the underlying filesystem for updates
/**
* @param int $policy either IWatcher::CHECK_NEVER, IWatcher::CHECK_ONCE, IWatcher::CHECK_ALWAYS
* @since 9.0.0
*/
public function setPolicy($policy);
/**
* @return int either IWatcher::CHECK_NEVER, IWatcher::CHECK_ONCE, IWatcher::CHECK_ALWAYS
* @since 9.0.0
*/
public function getPolicy();
/**
* check $path for updates and update if needed
*
* @param string $path
* @param ICacheEntry|null $cachedEntry
* @return boolean true if path was updated
* @since 9.0.0
*/
public function checkUpdate($path, $cachedEntry = null);
/**
* Update the cache for changes to $path
*
* @param string $path
* @param ICacheEntry $cachedData
* @since 9.0.0
*/
public function update($path, $cachedData);
/**
* Check if the cache for $path needs to be updated
*
* @param string $path
* @param ICacheEntry $cachedData
* @return bool
* @since 9.0.0
*/
public function needsUpdate($path, $cachedData);
/**
* remove deleted files in $path from the cache
*
* @param string $path
* @since 9.0.0
*/
public function cleanFolder($path);
}