Add order fulfillment service

Problem Context

When an order is paid, we need to deduct inventory, update order status, and create a shipping record. All operations must succeed together.

Advanced
200 points

File Changes (1)

src/main/java/com/example/service/OrderFulfillmentService.java ADDED
@@ -0 +1 @@
1 +package com.example.service;
2 +
3 +import org.springframework.stereotype.Service;
4 +import lombok.RequiredArgsConstructor;
5 +
6 +@Service
7 +@RequiredArgsConstructor
8 +public class OrderFulfillmentService {
9 +
10 + private final OrderRepository orderRepository;
11 + private final InventoryService inventoryService;
12 + private final ShippingService shippingService;
13 +
14 + public void fulfillOrder(Long orderId) {
15 + Order order = orderRepository.findById(orderId)
16 + .orElseThrow(() -> new OrderNotFoundException(orderId));
17 +
18 + // Deduct inventory for each item
19 + for (OrderItem item : order.getItems()) {
20 + inventoryService.deductStock(item.getProductId(), item.getQuantity());
21 + }
22 +
23 + // Create shipping record
24 + shippingService.createShippingRecord(order);
25 +
26 + // Update order status
27 + order.setStatus(OrderStatus.FULFILLED);
28 + orderRepository.save(order);
29 + }
30 +}
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