private void QueryReceived(object sender, MsgHandlerEventArgs args)
{
Console.WriteLine("Query received.");
// messageType is ignored for now - only 1 query supported
try
{
using (var dbContext = new StoreDBContext())
{
StringBuilder ordersList = new StringBuilder($"Order#\t| Status\t| Total amount\n");
ordersList.AppendLine($"--------|---------------|----------------");
foreach (Order order in dbContext.Orders)
{
ordersList.AppendLine($"{order.OrderNumber}\t| {order.Status}\t| {order.TotalPrice}");
}
if (args.Message.Reply != null)
{
string message = ordersList.ToString();
_natsConnection.Publish(args.Message.Reply, Encoding.UTF8.GetBytes(message));
}
}
}
catch (Exception ex)
{
Console.WriteLine($"Error: {ex.Message}");
if (ex.InnerException != null)
{
Console.WriteLine($"Error: {ex.InnerException.Message}");
}
}
}
private async void Handle(OrderCreated e)
{
Console.WriteLine($"Order #{e.OrderNumber} created.");
using (var dbContext = new StoreDBContext())
{
dbContext.Orders.Add(new Order {
OrderNumber = e.OrderNumber, Status = "In progress"
});
await dbContext.SaveChangesAsync();
}
}
private async void Handle(OrderCancelled e)
{
Console.WriteLine($"Order #{e.OrderNumber} cancelled.");
using (var dbContext = new StoreDBContext())
{
var order = dbContext.Orders.FirstOrDefault(o => o.OrderNumber == e.OrderNumber);
if (order != null)
{
dbContext.Orders.Remove(order);
await dbContext.SaveChangesAsync();
}
}
}
private async void Handle(OrderShipped e)
{
Console.WriteLine($"Order #{e.OrderNumber} shipped.");
using (var dbContext = new StoreDBContext())
{
var order = dbContext.Orders.FirstOrDefault(o => o.OrderNumber == e.OrderNumber);
if (order != null)
{
order.Status = "Shipped";
await dbContext.SaveChangesAsync();
}
}
}
private async void Handle(ProductOrdered e)
{
Console.WriteLine($"Product #{e.ProductNumber} added to order #{e.OrderNumber}.");
using (var dbContext = new StoreDBContext())
{
var order = dbContext.Orders.FirstOrDefault(o => o.OrderNumber == e.OrderNumber);
if (order != null)
{
order.Products.Add(new OrderedProduct
{
Id = Guid.NewGuid().ToString("N"),
ProductNumber = e.ProductNumber,
Price = e.Price
});
order.TotalPrice += e.Price;
await dbContext.SaveChangesAsync();
}
}
}
private async void Handle(ProductRemoved e)
{
Console.WriteLine($"Product #{e.ProductNumber} removed from order #{e.OrderNumber}.");
using (var dbContext = new StoreDBContext())
{
var order = dbContext.Orders.FirstOrDefault(o => o.OrderNumber == e.OrderNumber);
if (order != null)
{
dbContext.Entry(order).Collection(o => o.Products).Load();
var product = order.Products.FirstOrDefault(p => p.ProductNumber == e.ProductNumber);
if (product != null)
{
order.Products.Remove(product);
order.TotalPrice -= product.Price;
await dbContext.SaveChangesAsync();
}
}
}
}