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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\Console\Command;
use Symfony\Component\Console\Exception\LogicException;
use Symfony\Component\Console\Exception\RuntimeException;
use Symfony\Component\Filesystem\LockHandler;
/**
* Basic lock feature for commands.
*
* @author Geoffrey Brier <geoffrey.brier@gmail.com>
*/
trait LockableTrait
{
private $lockHandler;
/**
* Locks a command.
*
* @return bool
*/
private function lock($name = null, $blocking = false)
{
if (!class_exists(LockHandler::class)) {
throw new RuntimeException('To enable the locking feature you must install the symfony/filesystem component.');
}
if (null !== $this->lockHandler) {
throw new LogicException('A lock is already in place.');
}
$this->lockHandler = new LockHandler($name ?: $this->getName());
if (!$this->lockHandler->lock($blocking)) {
$this->lockHandler = null;
return false;
}
return true;
}
/**
* Releases the command lock if there is one.
*/
private function release()
{
if ($this->lockHandler) {
$this->lockHandler->release();
$this->lockHandler = null;
}
}
}