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<?php |
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declare(strict_types=1); |
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namespace Yiisoft\Mutex; |
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use InvalidArgumentException; |
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use PDO; |
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use RuntimeException; |
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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 $name; |
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private PDO $connection; |
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private bool $released = false; |
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/** |
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* DbMutex constructor. |
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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->name = $name; |
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$this->connection = $connection; |
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$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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} |
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/** |
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* {@inheritdoc} |
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* |
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* @see http://dev.mysql.com/doc/refman/5.0/en/miscellaneous-functions.html#function_get-lock |
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*/ |
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public function acquire(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', $this->hashLockName($this->name)); |
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$statement->bindValue(':timeout', $timeout); |
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$statement->execute(); |
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if ($statement->fetchColumn()) { |
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$this->released = false; |
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return true; |
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} |
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return false; |
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} |
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/** |
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* {@inheritdoc} |
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* |
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* @see http://dev.mysql.com/doc/refman/5.0/en/miscellaneous-functions.html#function_release-lock |
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*/ |
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public function release(): void |
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{ |
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$statement = $this->connection->prepare('SELECT RELEASE_LOCK(:name)'); |
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$statement->bindValue(':name', $this->hashLockName($this->name)); |
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$statement->execute(); |
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if (!$statement->fetchColumn()) { |
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throw new RuntimeException("Unable to release lock \"$this->name\"."); |
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} |
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$this->released = true; |
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} |
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public function isReleased(): bool |
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{ |
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return $this->released; |
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} |
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/** |
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* Generate hash for lock name to avoid exceeding lock name length limit. |
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* |
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* @param string $name |
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* |
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* @return string |
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* |
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* @see https://github.com/yiisoft/yii2/pull/16836 |
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*/ |
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private function hashLockName(string $name): string |
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{ |
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return sha1($name); |
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} |
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} |
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yiisoft /
mutex-pdo-mysql
