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<?php
declare(strict_types=1);
namespace malkusch\lock\mutex;
use RuntimeException;
class PgAdvisoryLockMutex extends LockMutex
{
/**
* @var \PDO
*/
private $pdo;
/**
* @var int
*/
private $key1;
/**
* @var int
*/
private $key2;
/**
* @throws \RuntimeException
*/
public function __construct(\PDO $PDO, string $name)
{
$this->pdo = $PDO;
$hashed_name = hash('sha256', $name, true);
if (false === $hashed_name) { // @phpstan-ignore-line
throw new RuntimeException('Unable to hash the key, sha256 algorithm is not supported.');
}
[$bytes1, $bytes2] = str_split($hashed_name, 4);
$this->key1 = unpack('i', $bytes1)[1];
$this->key2 = unpack('i', $bytes2)[1];
}
public function lock(): void
{
$statement = $this->pdo->prepare('SELECT pg_advisory_lock(?,?)');
$statement->execute([
$this->key1,
$this->key2,
]);
}
public function unlock(): void
{
$statement = $this->pdo->prepare('SELECT pg_advisory_unlock(?,?)');
$statement->execute([
$this->key1,
$this->key2
]);
}
}
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