isTransportDead example

    protected function getNextTransport(): ?TransportInterface
    {
        if (-1 === $this->cursor) {
            $this->cursor = $this->getInitialCursor();
        }

        $cursor = $this->cursor;
        while (true) {
            $transport = $this->transports[$cursor];

            if (!$this->isTransportDead($transport)) {
                break;
            }

            if ((microtime(true) - $this->deadTransports[$transport]) > $this->retryPeriod) {
                $this->deadTransports->detach($transport);

                break;
            }

            if ($this->cursor === $cursor = $this->moveCursor($cursor)) {
                return null;
            }

/** * Uses several Transports using a failover algorithm. * * @author Fabien Potencier <fabien@symfony.com> */
class FailoverTransport extends RoundRobinTransport
{
    private ?TransportInterface $currentTransport = null;

    protected function getNextTransport(): ?TransportInterface
    {
        if (null === $this->currentTransport || $this->isTransportDead($this->currentTransport)) {
            $this->currentTransport = parent::getNextTransport();
        }

        return $this->currentTransport;
    }

    protected function getInitialCursor(): int
    {
        return 0;
    }

    

/** * Uses several Transports using a failover algorithm. * * @author Fabien Potencier <fabien@symfony.com> */
class FailoverTransport extends RoundRobinTransport
{
    private ?TransportInterface $currentTransport = null;

    protected function getNextTransport(MessageInterface $message): ?TransportInterface
    {
        if (null === $this->currentTransport || $this->isTransportDead($this->currentTransport)) {
            $this->currentTransport = parent::getNextTransport($message);
        }

        return $this->currentTransport;
    }

    protected function getInitialCursor(): int
    {
        return 0;
    }

    

$cursor = $this->cursor;
        while (true) {
            $transport = $this->transports[$cursor];

            if (!$transport->supports($message)) {
                $cursor = $this->moveCursor($cursor);

                continue;
            }

            if (!$this->isTransportDead($transport)) {
                break;
            }

            if ((microtime(true) - $this->deadTransports[$transport]) > $this->retryPeriod) {
                $this->deadTransports->detach($transport);

                break;
            }

            if ($this->cursor === $cursor = $this->moveCursor($cursor)) {
                return null;
            }