79 lines
2.0 KiB
PHP
79 lines
2.0 KiB
PHP
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<?php
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declare(strict_types=1);
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/**
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* @copyright 2019 Christoph Wurst <christoph@winzerhof-wurst.at>
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*
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* @author 2019 Christoph Wurst <christoph@winzerhof-wurst.at>
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*
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* @license GNU AGPL version 3 or any later version
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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namespace OC\EventDispatcher;
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use OCP\AppFramework\QueryException;
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use OCP\EventDispatcher\Event;
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use OCP\EventDispatcher\IEventListener;
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use OCP\IContainer;
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use OCP\ILogger;
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/**
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* Lazy service event listener
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*
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* Makes it possible to lazy-route a dispatched event to a service instance
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* created by the service container
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*/
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final class ServiceEventListener {
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/** @var IContainer */
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private $container;
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/** @var string */
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private $class;
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/** @var ILogger */
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private $logger;
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/** @var null|IEventListener */
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private $service;
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public function __construct(IContainer $container,
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string $class,
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ILogger $logger) {
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$this->container = $container;
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$this->class = $class;
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$this->logger = $logger;
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}
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public function __invoke(Event $event) {
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if ($this->service === null) {
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try {
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$this->service = $this->container->query($this->class);
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} catch (QueryException $e) {
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$this->logger->logException($e, [
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'level' => ILogger::ERROR,
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'message' => "Could not load event listener service " . $this->class,
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]);
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return;
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}
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}
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$this->service->handle($event);
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}
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}
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