// Case Study Implementation — Order Management System // Complete Order Management with ERP integration public class OrderManagementService { // Use case: Customer places order → validate → create in SF → sync to ERP public static Order__c processOrder(OrderRequest request) { Savepoint sp = Database.setSavepoint(); try { // 1. Validate order validateOrder(request); // 2. Calculate pricing Decimal totalPrice = calculatePricing( request.lineItems, request.discountCode ); // 3. Create order in Salesforce Order__c order = createOrder(request, totalPrice); // 4. Create line items List lineItems = createLineItems( order.Id, request.lineItems ); // 5. Update account statistics updateAccountStats(request.accountId, totalPrice); // 6. Publish event for ERP sync (async, decoupled) publishOrderEvent(order, lineItems); return order; } catch (Exception e) { Database.rollback(sp); ErrorLogger.log(e, 'OrderManagementService.processOrder'); throw e; } } private static void validateOrder(OrderRequest request) { if (request.lineItems == null || request.lineItems.isEmpty()) { throw new OrderException('Order must have at least one line item'); } // Check product availability Set productIds = new Set(); for (LineItemRequest li : request.lineItems) { productIds.add(li.productId); } Map products = new Map( [SELECT Id, Name, IsActive, Family FROM Product2 WHERE Id IN :productIds] ); for (LineItemRequest li : request.lineItems) { Product2 product = products.get(li.productId); if (product == null || !product.IsActive) { throw new OrderException('Product not found or inactive: ' + li.productId); } if (li.quantity <= 0) { throw new OrderException('Quantity must be positive'); } } } private static Decimal calculatePricing( List items, String discountCode ) { Decimal total = 0; for (LineItemRequest li : items) { total += li.unitPrice * li.quantity; } // Apply discount if (String.isNotBlank(discountCode)) { Discount_Code__c discount = DiscountService.validate(discountCode); if (discount != null) { total *= (1 - discount.Percentage__c / 100); } } return total; } private static Order__c createOrder(OrderRequest request, Decimal total) { Order__c order = new Order__c( Account__c = request.accountId, Order_Date__c = Date.today(), Total_Amount__c = total, Status__c = 'Pending', Payment_Method__c = request.paymentMethod, Shipping_Address__c = request.shippingAddress, External_Reference__c = generateOrderRef() ); insert order; return order; } private static List createLineItems( Id orderId, List items ) { List lineItems = new List(); for (Integer i = 0; i < items.size(); i++) { lineItems.add(new Order_Line_Item__c( Order__c = orderId, Product__c = items[i].productId, Quantity__c = items[i].quantity, Unit_Price__c = items[i].unitPrice, Line_Number__c = i + 1 )); } insert lineItems; return lineItems; } private static void publishOrderEvent(Order__c order, List items) { Order_Event__e event = new Order_Event__e( Order_Id__c = order.Id, Account_Id__c = order.Account__c, Total_Amount__c = order.Total_Amount__c, Status__c = order.Status__c, Event_Type__c = 'ORDER_CREATED', Line_Item_Count__c = items.size() ); EventBus.publish(event); } private static String generateOrderRef() { return 'ORD-' + String.valueOf(Datetime.now().getTime()).right(10); } // Request classes public class OrderRequest { public Id accountId; public List lineItems; public String discountCode; public String paymentMethod; public String shippingAddress; } public class LineItemRequest { public Id productId; public Integer quantity; public Decimal unitPrice; } public class OrderException extends Exception {} }

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