class MyParallelBatchHandler
{
    use BatchAsyncHandlerTrait;
    
    public function __construct(ParallelMessageBus $parallelBus)
    {
        $this->setParallelMessageBus($parallelBus);
    }
    
    public function __invoke(MyMessage $message)
    {
        return $this->handle($message, null);
    }
    
    private function process(array $jobs): void
    {
        // This is the fallback implementation that will only be used
        // if ParallelMessageBus is not available/set
        
        // Extract message data
        $data = array_map(fn($job) => $job[0]->getData(), $jobs);
        
        // Perform batch processing
        // ...
        
        // Acknowledge all messages
        foreach ($jobs as [$message, $ack]) {
            $ack->ack();
        }
    }
}