server/lib/public/files/storage/istoragefactory.php

<?php
/**
 * @author Morris Jobke <hey@morrisjobke.de>
 * @author Robin Appelman <icewind@owncloud.com>
 * @author Vincent Petry <pvince81@owncloud.com>
 *
 * @copyright Copyright (c) 2016, ownCloud, Inc.
 * @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\Storage;
use OCP\Files\Mount\IMountPoint;

/**
 * Creates storage instances and manages and applies storage wrappers
 * @since 8.0.0
 */
interface IStorageFactory {
	/**
	 * allow modifier storage behaviour by adding wrappers around storages
	 *
	 * $callback should be a function of type (string $mountPoint, Storage $storage) => Storage
	 *
	 * @param string $wrapperName
	 * @param callable $callback
	 * @return bool true if the wrapper was added, false if there was already a wrapper with this
	 * name registered
	 * @since 8.0.0
	 */
	public function addStorageWrapper($wrapperName, $callback);

	/**
	 * @param \OCP\Files\Mount\IMountPoint $mountPoint
	 * @param string $class
	 * @param array $arguments
	 * @return \OCP\Files\Storage
	 * @since 8.0.0
	 */
	public function getInstance(IMountPoint $mountPoint, $class, $arguments);
}