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<?php
declare(strict_types=1);
/**
* SPDX-FileCopyrightText: 2019 Nextcloud GmbH and Nextcloud contributors
* SPDX-License-Identifier: AGPL-3.0-or-later
*/
namespace OC\EventDispatcher;
use OCP\AppFramework\QueryException;
use OCP\EventDispatcher\Event;
use OCP\EventDispatcher\IEventListener;
use OCP\IServerContainer;
use Psr\Log\LoggerInterface;
use function sprintf;
/**
* Lazy service event listener
*
* Makes it possible to lazy-route a dispatched event to a service instance
* created by the service container
*/
final class ServiceEventListener {
/** @var IServerContainer */
private $container;
/** @var string */
private $class;
/** @var LoggerInterface */
private $logger;
/** @var null|IEventListener */
private $service;
public function __construct(IServerContainer $container,
string $class,
LoggerInterface $logger) {
$this->container = $container;
$this->class = $class;
$this->logger = $logger;
}
public function __invoke(Event $event) {
if ($this->service === null) {
try {
// TODO: fetch from the app containers, otherwise any custom services,
// parameters and aliases won't be resolved.
// See https://github.com/nextcloud/server/issues/27793 for details.
$this->service = $this->container->query($this->class);
} catch (QueryException $e) {
$this->logger->error(
sprintf(
'Could not load event listener service %s: %s. Make sure the class is auto-loadable by the Nextcloud server container',
$this->class,
$e->getMessage()
),
[
'exception' => $e,
]
);
return;
}
}
$this->service->handle($event);
}
}
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