public class OrderService {
...
public Order createOrder(long consumerId, long restaurantId,
List<MenuItemIdAndQuantity> lineItems) {
Restaurant restaurant = restaurantRepository.findById(restaurantId)
.orElseThrow(() -> new RestaurantNotFoundException(restaurantId));
List<OrderLineItem> orderLineItems = makeOrderLineItems(lineItems, restaurant);
ResultWithDomainEvents<Order, OrderDomainEvent> orderAndEvents =
Order.createOrder(consumerId, restaurant, orderLineItems);
Order order = orderAndEvents.result;
orderRepository.save(order);
orderAggregateEventPublisher.publish(order, orderAndEvents.events);
OrderDetails orderDetails = new OrderDetails(consumerId, restaurantId, orderLineItems, order.getOrderTotal());
CreateOrderSagaState data = new CreateOrderSagaState(order.getId(), orderDetails);
createOrderSagaManager.create(data, Order.class, order.getId());
meterRegistry.ifPresent(mr -> mr.counter("placed_orders").increment());
return order;
}