Managing Dependencies and Integrating Microservices with Shared Kernel: A Practical Guide

// Define a core set of data types and interface
public interface IOrderService
{
? ? void ProcessOrder(Order order);
}


public class Order
{
? ? public int Id { get; set; }
? ? public string CustomerName { get; set; }
? ? public decimal Total { get; set; }
}


// Define a shared kernel that implements the core set of data types and interfaces
public class SharedKernel
{
? ? private readonly List<Order> _orders = new List<Order>();


? ? public void AddOrder(Order order)
? ? {
? ? ? ? _orders.Add(order);
? ? }


? ? public IEnumerable<Order> GetOrders()
? ? {
? ? ? ? return _orders;
? ? }
}


// Define two applications that use the shared kernel
public class SalesApplication
{
? ? private readonly SharedKernel _sharedKernel;
? ? private readonly IOrderService _orderService;


? ? public SalesApplication(SharedKernel sharedKernel, IOrderService orderService)
? ? {
? ? ? ? _sharedKernel = sharedKernel;
? ? ? ? _orderService = orderService;
? ? }


? ? public void PlaceOrder(Order order)
? ? {
? ? ? ? _sharedKernel.AddOrder(order);
? ? ? ? _orderService.ProcessOrder(order);
? ? }
}


public class FinanceApplication
{
? ? private readonly SharedKernel _sharedKernel;


? ? public FinanceApplication(SharedKernel sharedKernel)
? ? {
? ? ? ? _sharedKernel = sharedKernel;
? ? }


? ? public decimal CalculateTotalRevenue()
? ? {
? ? ? ? var orders = _sharedKernel.GetOrders();
? ? ? ? return orders.Sum(o => o.Total);
? ? }
}