owncloud/core

<?php
/**
 * @author Robin Appelman <icewind@owncloud.com>
 *
 * @copyright Copyright (c) 2018, ownCloud GmbH
 * @license AGPL-3.0
 *
 * 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\Command;

use OCP\Command\IBus;
use OCP\Command\ICommand;

class QueueBus implements IBus {
    /**
     * @var (ICommand|callable)[]
     */
    private $queue = [];

    /**
     * Schedule a command to be fired
     *
     * @param \OCP\Command\ICommand | callable $command
     */
    public function push($command) {
        $this->queue[] = $command;
    }

    /**
     * Require all commands using a trait to be run synchronous
     *
     * @param string $trait
     */
    public function requireSync($trait) {
    }

    /**
     * @param \OCP\Command\ICommand | callable $command
     */
    private function runCommand($command) {
        if ($command instanceof ICommand) {
            // ensure the command can be serialized
            $serialized = \serialize($command);
            if (\strlen($serialized) > 4000) {
                throw new \InvalidArgumentException('Trying to push a command which serialized form can not be stored in the database (>4000 character)');
            }
            $unserialized = \unserialize($serialized);
            $unserialized->handle();
        } else {
            $command();
        }
    }

    public function run() {
        while ($command = \array_shift($this->queue)) {
            $this->runCommand($command);
        }
    }
}