* * 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\Lock\LockFactory; use Symfony\Component\Lock\LockInterface; use Symfony\Component\Lock\Store\FlockStore; use Symfony\Component\Lock\Store\SemaphoreStore; /** * Basic lock feature for commands. * * @author Geoffrey Brier */ trait LockableTrait { /** @var LockInterface|null */ private $lock; /** * Locks a command. */ private function lock(?string $name = null, bool $blocking = false): bool { if (!class_exists(SemaphoreStore::class)) { throw new LogicException('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(); } $this->lock = (new LockFactory($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; } } }