Chris@0: <?php
Chris@0: 
Chris@0: /*
Chris@0:  * This file is part of the Symfony package.
Chris@0:  *
Chris@0:  * (c) Fabien Potencier <fabien@symfony.com>
Chris@0:  *
Chris@0:  * For the full copyright and license information, please view the LICENSE
Chris@0:  * file that was distributed with this source code.
Chris@0:  */
Chris@0: 
Chris@0: namespace Symfony\Component\Console\Command;
Chris@0: 
Chris@0: use Symfony\Component\Console\Exception\LogicException;
Chris@0: use Symfony\Component\Console\Exception\RuntimeException;
Chris@0: use Symfony\Component\Filesystem\LockHandler;
Chris@0: 
Chris@0: /**
Chris@0:  * Basic lock feature for commands.
Chris@0:  *
Chris@0:  * @author Geoffrey Brier <geoffrey.brier@gmail.com>
Chris@0:  */
Chris@0: trait LockableTrait
Chris@0: {
Chris@0:     private $lockHandler;
Chris@0: 
Chris@0:     /**
Chris@0:      * Locks a command.
Chris@0:      *
Chris@0:      * @return bool
Chris@0:      */
Chris@0:     private function lock($name = null, $blocking = false)
Chris@0:     {
Chris@0:         if (!class_exists(LockHandler::class)) {
Chris@0:             throw new RuntimeException('To enable the locking feature you must install the symfony/filesystem component.');
Chris@0:         }
Chris@0: 
Chris@0:         if (null !== $this->lockHandler) {
Chris@0:             throw new LogicException('A lock is already in place.');
Chris@0:         }
Chris@0: 
Chris@0:         $this->lockHandler = new LockHandler($name ?: $this->getName());
Chris@0: 
Chris@0:         if (!$this->lockHandler->lock($blocking)) {
Chris@0:             $this->lockHandler = null;
Chris@0: 
Chris@0:             return false;
Chris@0:         }
Chris@0: 
Chris@0:         return true;
Chris@0:     }
Chris@0: 
Chris@0:     /**
Chris@0:      * Releases the command lock if there is one.
Chris@0:      */
Chris@0:     private function release()
Chris@0:     {
Chris@0:         if ($this->lockHandler) {
Chris@0:             $this->lockHandler->release();
Chris@0:             $this->lockHandler = null;
Chris@0:         }
Chris@0:     }
Chris@0: }