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<?php |
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declare(strict_types=1); |
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namespace Yiisoft\Mutex\Mysql; |
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use InvalidArgumentException; |
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use PDO; |
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use Yiisoft\Mutex\Mutex; |
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use function sha1; |
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/** |
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* MysqlMutex implements mutex "lock" mechanism via MySQL locks. |
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*/ |
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final class MysqlMutex extends Mutex |
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{ |
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private string $lockName; |
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private PDO $connection; |
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/** |
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* @param string $name Mutex name. |
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* @param PDO $connection PDO connection instance to use. |
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*/ |
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public function __construct(string $name, PDO $connection) |
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{ |
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$this->lockName = sha1($name); |
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$this->connection = $connection; |
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/** @var string $driverName */ |
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$driverName = $connection->getAttribute(PDO::ATTR_DRIVER_NAME); |
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if ($driverName !== 'mysql') { |
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throw new InvalidArgumentException("MySQL connection instance should be passed. Got \"$driverName\"."); |
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} |
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parent::__construct(self::class, $name); |
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} |
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/** |
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* {@inheritdoc} |
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* |
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* @see https://dev.mysql.com/doc/refman/8.0/en/locking-functions.html#function_get-lock |
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* @see https://dev.mysql.com/doc/refman/8.0/en/locking-functions.html#function_is-free-lock |
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*/ |
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protected function acquireLock(int $timeout = 0): bool |
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{ |
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$statement = $this->connection->prepare('SELECT GET_LOCK(:name, :timeout)'); |
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$statement->bindValue(':name', $this->lockName); |
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$statement->bindValue(':timeout', $timeout); |
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$statement->execute(); |
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return (bool) $statement->fetchColumn(); |
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} |
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/** |
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* {@inheritdoc} |
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* |
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* @see https://dev.mysql.com/doc/refman/8.0/en/locking-functions.html#function_release-lock |
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* @see https://dev.mysql.com/doc/refman/8.0/en/locking-functions.html#function_is-free-lock |
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*/ |
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protected function releaseLock(): bool |
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{ |
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$statement = $this->connection->prepare('SELECT RELEASE_LOCK(:name)'); |
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$statement->bindValue(':name', $this->lockName); |
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$statement->execute(); |
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return (bool) $statement->fetchColumn(); |
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} |
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} |
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yiisoft /
mutex-pdo-mysql
