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<?php
declare(strict_types=1);
/**
* @copyright 2022 Anna Larch <anna.larch@gmx.net>
* @author Anna Larch <anna.larch@gmx.net>
*
* @license AGPL-3.0-or-later
*
* 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 OC\Group;
use OCP\Cache\CappedMemoryCache;
use OCP\EventDispatcher\Event;
use OCP\EventDispatcher\IEventListener;
use OCP\Group\Events\GroupChangedEvent;
use OCP\ICache;
use OCP\ICacheFactory;
use OCP\IGroupManager;
/**
* Class that cache the relation Group ID -> Display name
*
* This saves fetching the group from the backend for "just" the display name
*/
class DisplayNameCache implements IEventListener {
private CappedMemoryCache $cache;
private ICache $memCache;
private IGroupManager $groupManager;
public function __construct(ICacheFactory $cacheFactory, IGroupManager $groupManager) {
$this->cache = new CappedMemoryCache();
$this->memCache = $cacheFactory->createDistributed('groupDisplayNameMappingCache');
$this->groupManager = $groupManager;
}
public function getDisplayName(string $groupId): ?string {
if (isset($this->cache[$groupId])) {
return $this->cache[$groupId];
}
$displayName = $this->memCache->get($groupId);
if ($displayName) {
$this->cache[$groupId] = $displayName;
return $displayName;
}
$group = $this->groupManager->get($groupId);
if ($group) {
$displayName = $group->getDisplayName();
} else {
$displayName = null;
}
$this->cache[$groupId] = $displayName;
$this->memCache->set($groupId, $displayName, 60 * 10); // 10 minutes
return $displayName;
}
public function clear(): void {
$this->cache = new CappedMemoryCache();
$this->memCache->clear();
}
public function handle(Event $event): void {
if ($event instanceof GroupChangedEvent && $event->getFeature() === 'displayName') {
$groupId = $event->getGroup()->getGID();
$newDisplayName = $event->getValue();
$this->cache[$groupId] = $newDisplayName;
$this->memCache->set($groupId, $newDisplayName, 60 * 10); // 10 minutes
}
}
}
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