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<?php
/**
* @copyright Copyright (c) 2016 Joas Schilling <coding@schilljs.com>
*
* @author Joas Schilling <coding@schilljs.com>
*
* @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\Activity;
/**
* Interface EventMerger
*
* @since 11.0
*/
interface IEventMerger {
/**
* Combines two events when possible to have grouping:
*
* Example1: Two events with subject '{user} created {file}' and
* $mergeParameter file with different file and same user will be merged
* to '{user} created {file1} and {file2}' and the childEvent on the return
* will be set, if the events have been merged.
*
* Example2: Two events with subject '{user} created {file}' and
* $mergeParameter file with same file and same user will be merged to
* '{user} created {file1}' and the childEvent on the return will be set, if
* the events have been merged.
*
* The following requirements have to be met, in order to be merged:
* - Both events need to have the same `getApp()`
* - Both events must not have a message `getMessage()`
* - Both events need to have the same subject `getSubject()`
* - Both events need to have the same object type `getObjectType()`
* - The time difference between both events must not be bigger then 3 hours
* - Only up to 5 events can be merged.
* - All parameters apart from such starting with $mergeParameter must be
* the same for both events.
*
* @param string $mergeParameter
* @param IEvent $event
* @param IEvent|null $previousEvent
* @return IEvent
* @since 11.0
*/
public function mergeEvents($mergeParameter, IEvent $event, ?IEvent $previousEvent = null);
}
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