public void Start()
{
lock (this)
{
Console.WriteLine("Customer " + customerID + " is running. Waiting for a reply.");
}
OrderRequestMessage request = new OrderRequestMessage
{
CustomerId = customerID,
ProductId = productID,
Country = country
};
using (IBus bus = RabbitHutch.CreateBus("host=localhost;persistentMessages=false"))
{
// Listen to reply messages from the Retailer (use Topic Based Routing).
// WRITE CODE HERE!
// Send an order request message to the Retailer (use a point-to-point channel).
// WRITE CODE HERE!
// Block this thread so that the customer instance will not exit.
Console.ReadLine();
}
}
public void Start()
{
lock (this)
{
Console.WriteLine("Customer " + customerID + " is running. Waiting for a reply.");
}
OrderRequestMessage request = new OrderRequestMessage
{
CustomerId = customerID,
ProductId = productID,
Country = country
};
using (IBus bus = RabbitHutch.CreateBus("host=localhost;persistentMessages=false"))
{
// Listen to reply messages from the Retailer (use Topic Based Routing).
bus.PubSub.Subscribe <OrderReplyMessage>(this.customerID.ToString(), HandleOrderEvent, x => x.WithTopic(this.customerID.ToString()));
// WRITE CODE HERE!
// Send an order request message to the Retailer (use a point-to-point channel).
//SEND
bus.SendReceive.Send("customerToRetailerQueue", request);
// WRITE CODE HERE!
// Block this thread so that the customer instance will not exit.
Console.ReadLine();
}
}
void HandleOrderRequestMessage(OrderRequestMessage message)
{
lock (this)
{
Console.WriteLine("Warehouse " + id + ": Order request received for order "
+ message.OrderId + ".");
}
int daysForDelivery = country == message.Country ? 2 : 10;
decimal shippingCharge = country == message.Country ? 5 : 10;
Product requestedProduct =
products.FirstOrDefault(p => p.ProductId == message.ProductId);
if (requestedProduct != null)
{
OrderReplyMessage replyMessage = new OrderReplyMessage
{
WarehouseId = id,
OrderId = message.OrderId,
ItemsInStock = requestedProduct.ItemsInStock,
DaysForDelivery = daysForDelivery,
ShippingCharge = shippingCharge
};
// Send the reply message to the Retailer.
bus.SendReceive.Send("warehouseToRetailerQueue", replyMessage);
lock (this)
{
Console.WriteLine("Warehouse " + id + ": Reply for order " +
message.OrderId + " sent back to retailer.");
}
}
}
static void Timeout_Elapsed(object message)
{
OrderRequestMessage m = message as OrderRequestMessage;
lock (lockObject)
{
Console.WriteLine("Processing replies for request from customer " + m.CustomerId + ".");
// Get all replies from warehouses for this specific order.
var repliesForThisOrder = allReplies.FindAll(r => r.OrderId == m.OrderId);
if (repliesForThisOrder.Count > 0)
{
// Get a reply from a local warehouse (DaysForDelivery == 2) if possible.
var reply =
repliesForThisOrder.FirstOrDefault(r => r.DaysForDelivery == 2);
if (reply == null)
{
// Otherwise, accept the first reply from one of the other warehouses.
reply = repliesForThisOrder.First();
}
// Remove the replies for this specific order from the "allReplies" list,
// because they have already been processed.
allReplies.RemoveAll(r => r.OrderId == m.OrderId);
// Uses Topic Based Routing to send the reply to a customer.
// The topic ís the CustomerId for the outstanding request.
bus.PubSub.Publish <OrderReplyMessage>(reply, m.CustomerId.ToString());
Console.WriteLine("Order: " + reply.OrderId);
Console.WriteLine("Warehouse: " + reply.WarehouseId);
Console.WriteLine("Items: " + reply.ItemsInStock);
Console.WriteLine("Shipping charge: " + reply.ShippingCharge);
Console.WriteLine("Days for delivery: " + reply.DaysForDelivery);
}
else // if there was no reply from any warehouse
{
Console.WriteLine("No items in stock for this product.");
OrderReplyMessage replyNoItems = new OrderReplyMessage();
replyNoItems.OrderId = m.OrderId;
bus.PubSub.Publish <OrderReplyMessage>(replyNoItems, m.CustomerId.ToString());
}
}
}
static void HandleOrderRequest(OrderRequestMessage message)
{
message.OrderId = ++orderId;
// Send an order request message to all warehouses (publish-subscribe channel).
// WRITE CODE HERE!
lock (lockObject)
{
Console.WriteLine("Order request message from customer " + message.CustomerId + " published");
}
// Create a timer to wait for a specified amount of time for replies from
// warehouses. When the timeout occurs, the specified event handler
// (Timeout_Elapsed) will process the replies from warehouses and reply
// to the customer who created the order request.
// Beware that a timer runs in a separate thread.
Timer timer = new Timer(Timeout_Elapsed, message, timeoutInterval, Timeout.Infinite);
}
