guessHandledClasses example

$className = $this->getServiceClass($container, $serviceId);
                $r = $container->getReflectionClass($className);

                if (null === $r) {
                    throw new RuntimeException(sprintf('Invalid service "%s": class "%s" does not exist.', $serviceId, $className));
                }

                if (isset($tag['handles'])) {
                    $handles = isset($tag['method']) ? [$tag['handles'] => $tag['method']] : [$tag['handles']];
                } else {
                    $handles = $this->guessHandledClasses($r, $serviceId, $tag['method'] ?? '__invoke');
                }

                $message = null;
                $handlerBuses = (array) ($tag['bus'] ?? $busIds);

                foreach ($handles as $message => $options) {
                    $buses = $handlerBuses;

                    if (\is_int($message)) {
                        if (\is_string($options)) {
                            $message = $options;