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<?php
declare(strict_types=1);
/**
* SPDX-FileCopyrightText: 2022 Nextcloud GmbH and Nextcloud contributors
* SPDX-License-Identifier: AGPL-3.0-or-later
*/
namespace OC\Group;
use OCP\Cache\CappedMemoryCache;
use OCP\EventDispatcher\Event;
use OCP\EventDispatcher\IEventListener;
use OCP\Group\Events\GroupChangedEvent;
use OCP\Group\Events\GroupDeletedEvent;
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
* @template-implements IEventListener<GroupChangedEvent|GroupDeletedEvent>
*/
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, $newDisplayName, 60 * 10); // 10 minutes
}
if ($event instanceof GroupDeletedEvent) {
$groupId = $event->getGroup()->getGID();
unset($this->cache[$groupId]);
$this->memCache->remove($groupId);
}
}
}
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