nextcloud/lib/public/Files/Storage/INotifyStorage.php

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<?php
/**
* @copyright Copyright (c) 2016 Robin Appelman <robin@icewind.nl>
*
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* @author Robin Appelman <robin@icewind.nl>
*
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* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* 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
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
namespace OCP\Files\Storage;
/**
* Storage backend that support active notifications
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*
* @since 9.1.0
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*/
interface INotifyStorage {
const NOTIFY_ADDED = 1;
const NOTIFY_REMOVED = 2;
const NOTIFY_MODIFIED = 3;
const NOTIFY_RENAMED = 4;
/**
* Start listening for update notifications
*
* The provided callback will be called for every incoming notification with the following parameters
* - int $type the type of update, one of the INotifyStorage::NOTIFY_* constants
* - string $path the path of the update
* - string $renameTarget the target of the rename operation, only provided for rename updates
*
* Note that this call is blocking and will not exit on it's own, to stop listening for notifications return `false` from the callback
*
* @param string $path
* @param callable $callback
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*
* @since 9.1.0
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*/
public function listen($path, callable $callback);
}