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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\Lock\Factory; use Symfony\Component\Lock\Lock; use Symfony\Component\Lock\Store\FlockStore; use Symfony\Component\Lock\Store\SemaphoreStore; /** * Basic lock feature for commands. * * @author Geoffrey Brier <geoffrey.brier@gmail.com> */ trait LockableTrait { /** @var Lock */ private $lock; /** * Locks a command. * * @return bool */ private function lock($name = null, $blocking = false) { if (!class_exists(SemaphoreStore::class)) { throw new RuntimeException('To enable the locking feature you must install the symfony/lock component.'); } if (null !== $this->lock) { throw new LogicException('A lock is already in place.'); } if (SemaphoreStore::isSupported()) { $store = new SemaphoreStore(); } else { $store = new FlockStore(); } $this->lock = (new Factory($store))->createLock($name ?: $this->getName()); if (!$this->lock->acquire($blocking)) { $this->lock = null; return false; } return true; } /** * Releases the command lock if there is one. */ private function release() { if ($this->lock) { $this->lock->release(); $this->lock = null; } } }