Project Description

As part of a team of six, I developed a full-stack online game store for a fictional client, designed to manage game inventory, user accounts, and purchases. The project featured a responsive user interface, thorough test suite, and role-based account permissions. Following industry best practices, the system was built with a focus on reliability, usability, and scalability, achieving comprehensive test coverage and meeting all specified functional and non-functional requirements.

Technical Details

• Backend: Implemented a layered architecture with a RESTful API strategy to handle requests efficiently. Integrated secure user authentication, role-based access control, and encrypted password storage.
• Functionalities:
• Browse, search, and filter available games by title or category.
• Manage user roles (customers, employees, and store owners) with distinct permissions.
• Add games to cart, process purchases, validate payment and address details, and notify users of successful transactions.
• Implement inventory management, wish lists, order history tracking, and customer reviews.
• Enable owners to manage employee accounts, respond to reviews, and configure game promotions.
• Ensure smooth user navigation with intuitive UI design.
• Testing and Performance: Achieved 96% unit test coverage and 91% branch coverage with over 700 unit and integration tests. Optimized key operations to process transactions and display content within 2 seconds under normal load.
• Frontend: Designed a responsive and modern user interface with a focus on usability, clean design, and cross-resolution compatibility

Languages & Technologies Used

• Backend: Java Spring Boot, Hibernate, RESTful APIs, Gradle, JUnit
• Database: PostgreSQL
• Frontend: Vue.js, JavaScript, HTML, CSS
• Tools: UML for design, Git for version control

Code Snippet

  /**
  * Processes the purchase of all items in a customer's cart.
  * 
  * @param username The username of the customer making the purchase.
  * @return Order if the purchase is successful.
  */
 @Transactional
 public Order purchaseCart(String username) {
     // Retrieve customer details by username
     Customer customer = customerRepo.findByUsername(username);
     if (customer == null) {
         throw new ResponseStatusException(HttpStatus.NOT_FOUND, "No such customer with username exists");
     }

     // Check if customer has payment information
     PaymentInformation paymentInformation = customer.getPaymentInformation();
     if (paymentInformation == null) {
         throw new ResponseStatusException(HttpStatus.BAD_REQUEST, "Customer does not have valid payment information");
     }

     // Validate postal code format for billing address
     if (!paymentInformation.getBillingAddress().getPostalCode()
             .matches("^[A-Za-z][0-9][A-Za-z][0-9][A-Za-z][0-9]$")) {
         throw new ResponseStatusException(HttpStatus.BAD_REQUEST,
                 "Customer address postal code information is not valid");
     }

     // Validate credit card number and CVV code
     if (paymentInformation.getCardNumber().length() != 16) {
         throw new ResponseStatusException(HttpStatus.BAD_REQUEST, "Customer does not have valid credit card number");
     }
     if (Integer.toString(paymentInformation.getCvvCode()).length() != 3) {
         throw new ResponseStatusException(HttpStatus.BAD_REQUEST, "Customer does not have valid CVV code");
     }

     // Check if credit card is expired
     Date currentDate = new Date(System.currentTimeMillis());
     if (paymentInformation.getExpiryDate().before(currentDate)) {
         throw new ResponseStatusException(HttpStatus.BAD_REQUEST, "Customer credit card is expired");
     }

     // Retrieve all items in the customer's cart
     CartItem[] cartItems = getCartItems(customer);
     if (cartItems == null || cartItems.length <= 0) {
         throw new ResponseStatusException(HttpStatus.BAD_REQUEST, "Customer cart is empty");
     }

     // Check if there is enough stock for each game in the cart
     Game game;
     for (int i = 0; i < cartItems.length; i++) {
         game = cartItems[i].getKey().getGame();
         if (cartItems[i].getQuantity() > game.getStock()) {
             throw new ResponseStatusException(HttpStatus.BAD_REQUEST,
                     String.format("There is not enough stock of %s to complete purchase", game.getTitle()));
         }
     }

     // Create a new order for the customer
     Order order = new Order(currentDate, null, customer);
     order = orderRepo.save(order);
     // Reduce stock for each game and create GameCopy records
     double totalPrice = 0;
     GameCopy gameCopy;
     for (int i = 0; i < cartItems.length; i++) {
         game = cartItems[i].getKey().getGame();
         game.setStock(game.getStock() - cartItems[i].getQuantity());
         game = gameRepo.save(game);
         double gamePrice = game.getPrice();

         for (int j = 0; j < cartItems[i].getQuantity(); j++) {
             gameCopy = new GameCopy(order, game);
             gameCopy = gameCopyRepo.save(gameCopy);
             totalPrice += gamePrice;
         }
     }
     // Clear customer's cart and save the order
     clearCart(customer);
     totalPrice *= 1.1;  // Add the 10% QST
     totalPrice += 5;   // Add $5 delivery fee
     order.setTotalPrice(totalPrice);
     order = orderRepo.save(order);
     return order;
 }