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<?php
/**
* @copyright Copyright (c) 2016, ownCloud, Inc.
*
* @author Robin Appelman <robin@icewind.nl>
*
* @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;
/**
* Asynchronous command bus that uses the background job system as backend
*/
abstract class AsyncBus implements IBus {
/**
* List of traits for command which require sync execution
*
* @var string[]
*/
private $syncTraits = [];
/**
* Schedule a command to be fired
*
* @param \OCP\Command\ICommand | callable $command
*/
public function push($command) {
if ($this->canRunAsync($command)) {
$this->queueCommand($command);
} else {
$this->runCommand($command);
}
}
/**
* Queue a command in the bus
*
* @param \OCP\Command\ICommand | callable $command
*/
abstract protected function queueCommand($command);
/**
* Require all commands using a trait to be run synchronous
*
* @param string $trait
*/
public function requireSync($trait) {
$this->syncTraits[] = trim($trait, '\\');
}
/**
* @param \OCP\Command\ICommand | callable $command
*/
private function runCommand($command) {
if ($command instanceof ICommand) {
$command->handle();
} else {
$command();
}
}
/**
* @param \OCP\Command\ICommand | callable $command
* @return bool
*/
private function canRunAsync($command) {
$traits = $this->getTraits($command);
foreach ($traits as $trait) {
if (array_search($trait, $this->syncTraits) !== false) {
return false;
}
}
return true;
}
/**
* @param \OCP\Command\ICommand | callable $command
* @return string[]
*/
private function getTraits($command) {
if ($command instanceof ICommand) {
return class_uses($command);
} else {
return [];
}
}
}
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