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Amazon order checkout flow
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‎README.md‎

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@@ -12,13 +12,15 @@ Various Low Level Object-Oriented System Design problems are discussed in this s
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10. Chat application
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11. Notification system
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12. Leetcode / Hackerrank like online judge
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13. IMDB
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14. Amazon order checkout flow
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# Planned (In no particular order)
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1. File System
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2. Social media news feed
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3. Amazon order management
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4. Payment system
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3. Skyscanner Flights
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4. Stripe
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5. LinkedIn Job board
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6. API Rate Limiter
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7. Git version control
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11. Splitwise
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12. Elevator system
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13. Traffic control system
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14. IMDB
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14. Badge Swipe / Access system
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15. In-memory database
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16. Database Sharding Simulation
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17. Online food delivery fleet
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18. Vending machine
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19. Badge Swipe / Access system
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19. Airbnb
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20. Airport Management System
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21. Uber ride matching system
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22. Stack Overflow
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23. Zerodha
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24. Rule Engine
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25. PubSub system
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26. Task Management System
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27. RedBus
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28.

‎src/com/lld/amazon/Main.java‎

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package com.lld.amazon;
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import com.lld.amazon.constant.*;
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import com.lld.amazon.exception.PricingException;
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import com.lld.amazon.model.*;
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import com.lld.amazon.service.*;
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import com.lld.amazon.service.impl.*;
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import java.time.LocalDateTime;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.List;
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public class Main {
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private static void test1(PricingService pricingService, OrderService orderService, Customer customer,
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List<KV> customerPreferences) throws PricingException {
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Catalogue catalogue = new Catalogue();
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catalogue.addProduct(getProduct1(pricingService));
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HomePage home = new HomePage();
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home.addCatalogue(catalogue);
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HomePageService homePageService = new HomePageServiceImpl();
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List<Catalogue> catalogues = homePageService.chooseCatalogue(home);
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if (catalogues.isEmpty()) {
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throw new RuntimeException("Invalid test! No catalogue found");
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}
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List<Product> customerChosenProducts = homePageService.chooseProducts(catalogues);
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Product product = customerChosenProducts.get(0);
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System.out.println(product.getTitle());
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for (ProductVariety variety: product.getVarieties()) {
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System.out.println("Total amount: " + variety.getPricing().getTotalAmount());
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}
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CartService cartService = new CartServiceImpl(pricingService, orderService, customer, customerPreferences);
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Cart cart = cartService.addToCart(customer, product, product.getVarieties().get(0), 2);
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System.out.println("Cart cost: " + cart.getCartCost());
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// Customer can opt-in for any delivery option while checking out
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// The default is standard delivery
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DeliveryOption deliveryOption = new DeliveryOption(DeliveryType.ONE_DAY_DELIVERY,
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new DeliveryETA(LocalDateTime.now().plusDays(1)));
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Order order = cartService.checkout(cart, new PaymentMethod(
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PaymentMethodType.CASH_ON_DELIVERY, Collections.emptyList()),
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customer.getProfile().getDefaultDeliveryAddress(), deliveryOption
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);
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System.out.println("Order total: " + order.getOrderTotal());
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List<OrderItemDelivery> orderItemDeliveries = order.getOrderItemDeliveries();
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for (OrderItemDelivery delivery: orderItemDeliveries) {
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System.out.println(delivery.getItem().getProduct().getTitle() + " " + delivery.getItem().getChosenVariety().getTitleSuffix()
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+ " has ETA by date: " + delivery.getDeliveryETA().getETAHumanReadable());
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}
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Payment payment = orderService.pay(order);
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System.out.println("Payment status: " + payment.getPaymentStatus());
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}
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private static Product getProduct1(PricingService pricingService) throws PricingException {
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String title1 = "Redmi 13C (Starshine Green, 4GB RAM, 128GB Storage) " +
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"| Powered by 4G MediaTek Helio G85 | 90Hz Display | " +
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"50MP AI Triple Camera";
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String desc1 = "Processor: High performance MediaTek G85 ; Enhance gaming " +
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"with 1GHz GPU | 8GB of RAM including 4GB virtual | 6.74\" HD+ 90Hz " +
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"display with Corning Gorilla Glass 3 Protection | 50MP AI Triple " +
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"camera |Fast Side fingerprint | 5000mAh Battery";
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Seller seller = new Seller("Cloudtail");
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PricingGroup baseGroup = pricingService.registerPricingGroup(PricingGroups.BASE, PricingGroupType.ITEM_LEVEL, true);
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PricingGroup taxGroup = pricingService.registerPricingGroup(PricingGroups.TAX, PricingGroupType.ITEM_LEVEL, false);
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PricingGroup discountGroup = pricingService.registerPricingGroup(PricingGroups.DISCOUNT, PricingGroupType.ITEM_LEVEL, false);
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// Base price
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pricingService.registerPricingLineItemWithAmount(baseGroup, PricingLineItems.BASE_AMOUNT,
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new Money(11000D, CurrencySymbol.INR), null);
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// Tax
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pricingService.registerPricingLineItemWithPercentage(taxGroup, PricingLineItems.CGST,
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2.5D, new Money(CurrencySymbol.INR), baseGroup);
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pricingService.registerPricingLineItemWithPercentage(taxGroup, PricingLineItems.SGST,
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2.5D, new Money(CurrencySymbol.INR), baseGroup);
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// Discount
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pricingService.registerPricingLineItemWithPercentage(discountGroup, PricingLineItems.INSTANT_DISCOUNT,
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-10D, new Money(CurrencySymbol.INR), baseGroup);
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pricingService.registerPricingLineItemWithAmount(discountGroup, PricingLineItems.NEW_USER_DISCOUNT,
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new Money(-50D, CurrencySymbol.INR), baseGroup);
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Pricing pricing = new Pricing();
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pricing.addPricingGroup(baseGroup);
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pricing.addPricingGroup(taxGroup);
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pricing.addPricingGroup(discountGroup);
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ProductVarietyMetadata varietyMetadata = new ProductVarietyMetadata();
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// Product variety specific metadata
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varietyMetadata.addMetadata("Colour", "Green");
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varietyMetadata.addMetadata("RAM Memory Installed Size", "4 GB");
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varietyMetadata.addMetadata("CPU Model", "Snapdragon");
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varietyMetadata.addMetadata("Memory Storage Capacity", "128 GB");
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ProductVariety variety1 = new ProductVariety(pricing, varietyMetadata, seller);
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Product product1 = new Product(title1, desc1, List.of(variety1));
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// Top level product metadata irrespective of any variety
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product1.addMetadata("Brand", "Xiaomi");
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product1.addMetadata("Operating System", "MIUI 14, Android 13.0");
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product1.addPromise("Promise 1", "7 days Service Centre Replacement");
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product1.addPromise("Promise 2", "Free Delivery");
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product1.addPromise("Promise 3", "1 year Warranty Care");
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product1.addPromise("Promise 4", "1 year Warranty");
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product1.addPromise("Promise 5", "Pay on Delivery");
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product1.addPromise("Promise 6", "Top Brand");
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product1.addPromise("Promise 7", "Amazon Delivered");
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return product1;
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}
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public static void main(String[] args) throws PricingException {
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CustomerProfile customerProfile = new CustomerProfile(CurrencySymbol.INR); // Put addresses in the profile
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Customer customer = new Customer("test", "test@test.com", customerProfile);
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List<KV> customerPreferences = new ArrayList<>();
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customerPreferences.add(new KV(CustomerPreferenceKeys.CURRENCY, CurrencySymbol.INR));
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// Initialize dependencies here
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PricingService pricingService = new PricingServiceImpl();
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ETAService etaService = new ETAServiceImpl();
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OrderService orderService = new OrderServiceImpl(etaService);
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test1(pricingService, orderService, customer, customerPreferences);
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}
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}

‎src/com/lld/amazon/README.md‎

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# Design Amazon order checkout flow
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<b>Date: 08-08-2024</b>
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1. A user should be able to browse catalogues of products.
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2. A product might have multiple varieties
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3. The system should support different components of item and cart level pricing.
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The fare / price schema should be flexible
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4. Multiple delivery options, payment methods should be supported
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# TODO
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1. Support Billing
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2. Support order flow using state machine
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3. Support product level review and ratings
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4. Design the warehouse and procurement flow of products

‎src/com/lld/amazon/constant/CurrencySymbol.java‎

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package com.lld.amazon.constant;
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public enum CurrencySymbol {
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INR("INR"),
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USD("USD");
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private final String val;
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CurrencySymbol(String symbol) {
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this.val = symbol;
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}
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}

‎src/com/lld/amazon/constant/CustomerPreferenceKeys.java‎

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package com.lld.amazon.constant;
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public class CustomerPreferenceKeys {
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public static final String CURRENCY = "currency";
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}

‎src/com/lld/amazon/constant/DeliveryType.java‎

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package com.lld.amazon.constant;
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public enum DeliveryType {
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STANDARD_DELIVERY,
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SAME_DAY_DELIVERY,
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ONE_DAY_DELIVERY,
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TWO_DAY_DELIVERY,
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}

‎src/com/lld/amazon/constant/OfferType.java‎

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package com.lld.amazon.constant;
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public enum OfferType {
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CASHBACK,
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BANK_OFFER,
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PARTNER_OFFER,
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}

‎src/com/lld/amazon/constant/OrderState.java‎

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package com.lld.amazon.constant;
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public enum OrderState {
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ORDER_PLACED,
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READY_TO_DISPATCH,
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SHIPPED_BY_SELLER,
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PICKED_UP_BY_COURIER_PARTNER,
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IN_TRANSIT,
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DELIVERED,
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CANCELLED,
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MISSING,
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RETURNED,
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REFUNDED,
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EXCHANGED,
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}

‎src/com/lld/amazon/constant/PaymentMethodType.java‎

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package com.lld.amazon.constant;
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public enum PaymentMethodType {
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DEBIT_CARD,
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CREDIT_CARD,
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CASH_ON_DELIVERY,
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UPI,
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NET_BANKING,
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}

‎src/com/lld/amazon/constant/PaymentStatus.java‎

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package com.lld.amazon.constant;
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public enum PaymentStatus {
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TO_BE_INITIATED,
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IN_PROGRESS,
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SUCCESS,
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FAILED,
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CANCELED,
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}

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