/// <summary>
/// Event handler for the ReceiveCompleted event
/// - The messages received asynchronously are processed
/// </summary>
private void QueueReceiveCompleted(Object source,
ReceiveCompletedEventArgs asyncResult)
{
try
{
// End the Asynchronous Receive Operation
System.Messaging.Message message =
this.mqdemoAck.EndReceive(asyncResult.AsyncResult);
//Only Process Messages that contain the CD Orders
if (message.Body is CDOrder)
{
CDOrder cdOrder = message.Body as CDOrder;
object[] orders = new object[1];
orders[0] = cdOrder;
//call to modify listbox UI on main thread
this.listBoxProc.Invoke(new UpdateListBoxDelegate(UpdateListBox), orders);
}
else
{
MessageBox.Show("Message in Queue is not a CD Order");
}
}
catch (MessageQueueException e)
{
MessageBox.Show
(String.Format(System.Globalization.CultureInfo.CurrentCulture,
"Failed to receive Message: {0} ", e.ToString()));
}
//Begin the next Asynchronous Receive Operation
this.mqdemoAck.BeginReceive();
}
/// <summary>
/// Click event handler for the Display button
/// - Displays the Details about the CDs that have been
/// processed by the server.
/// </summary>
private void btnDisplay_Click(object sender, EventArgs e)
{
CDOrder cdOrder = (CDOrder)listBoxProc.SelectedItem;
//nothing selected
if (cdOrder == null)
{
return;
}
string display = "Title :" + cdOrder.Product.Title + "\n" +
"Quantity: " + cdOrder.Quantity.ToString(System.Globalization.CultureInfo.CurrentUICulture)
+ "\n" +
"Company: " + cdOrder.Customer.Company
+ "\n" +
"Contact: " + cdOrder.Customer.Contact
+ "\n" +
"Shipped: " + cdOrder.OrderTime.ToString
("g", System.Globalization.CultureInfo.CurrentUICulture);
MessageBox.Show(display);
listBoxProc.Items.Remove(cdOrder);
if (listBoxProc.Items.Count == 0)
{
this.BackColor = Color.Red;
}
}
/// <summary>
/// SelectedIndex Changed event handler for ListBox
/// - Peeks at the Message selected in the Queue
/// and Display information about the CD order in the queue
/// </summary>
private void lBOrders_SelectedIndexChanged(object sender, EventArgs e)
{
LabelIdMapping labelID = (LabelIdMapping)lBOrders.SelectedItem;
if (labelID == null)
{
return;
}
MessagePropertyFilter filter = new MessagePropertyFilter();
filter.SetDefaults();
filter.Priority = true;
mqOrderQueue.MessageReadPropertyFilter = filter;
System.Messaging.Message message = mqOrderQueue.PeekById(labelID.Id);
if (message.Body is CDOrder)
{
if (message.Priority > MessagePriority.Normal)
{
lblFast.Visible = true;
}
else
{
lblFast.Visible = false;
}
CDOrder cdOrder = message.Body as CDOrder;
tBCDTitle.Text = cdOrder.Product.Title;
tBCount.Text = cdOrder.Quantity.ToString();
tBCompany.Text = cdOrder.Customer.Company;
tBContact.Text = cdOrder.Customer.Contact;
tBSent.Text = cdOrder.OrderTime.ToString("f");
btnProcess.Enabled = true;
}
else
{
MessageBox.Show("The selected Item is not a book order");
}
}
private void btnProcess_Click(object sender, EventArgs e)
{
//The LabelIdMapping helps to map the Label of a message with the message Id.
//This enables each message to be uniquely identified
LabelIdMapping labelID = (LabelIdMapping)lBOrders.SelectedItem;
System.Messaging.Message message = mqOrderQueue.ReceiveById(labelID.Id);
lBOrders.Items.Remove(labelID);
lBOrders.SelectedIndex = -1;
btnProcess.Enabled = false;
System.Messaging.Message response = new System.Messaging.Message();
CDOrder ackOrder = message.Body as CDOrder;
if (null != ackOrder)
{
ackOrder.OrderTime = DateTime.Now;
response.Body = ackOrder;
response.Label = message.Label;
response.CorrelationId = message.Id;
message.ResponseQueue.Send(response);
tBCDTitle.Text = String.Empty;
tBCount.Text = String.Empty;
tBCompany.Text = String.Empty;
tBContact.Text = String.Empty;
tBSent.Text = String.Empty;
MessageBox.Show("The order was shipped");
}
else
{
MessageBox.Show("There is an unexpected item in the Queue");
}
}
/// <summary>
/// Click event handler for the Submit button
/// </summary>
private void btnSubmit_Click(object sender, EventArgs e)
{
try
{
this.btnSubmit.Enabled = false;
//Check if server name has been specified
if (textBoxServer.Text == String.Empty)
{
MessageBox.Show("Enter a name for the Server");
return;
}
//Retrieve the IP Address of the device.
string deviceIP = String.Empty;
IPAddress[] addresses = Dns.GetHostByName(Dns.GetHostName()).AddressList;
for (int i = 0; i < addresses.Length; ++i)
{
IPAddress addr = addresses[i];
if (addr.AddressFamily == AddressFamily.InterNetwork)
{
deviceIP = addr.ToString();
break;
}
}
if (deviceIP == String.Empty)
{
MessageBox.Show("Unable to retrieve Device IP");
return;
}
//Create a CD object that will be sent to the Server's queue
CDOrder cdOrder = new CDOrder();
cdOrder.Quantity = Convert.ToInt32(tBQty.Text,
System.Globalization.CultureInfo.CurrentUICulture);
cdOrder.Product = new CompactDisc(this.comboCD.SelectedItem.ToString());
cdOrder.Customer = new Customer(tBCompName.Text, tBContact.Text);
cdOrder.OrderTime = dateTimePicker1.Value;
// Send the CD object to a Queue on the server
//Create an instance of the MessageQueue class that abstracts a
//connection to a queue specified on the server
MessageQueue orderQueue = new MessageQueue
(String.Format(System.Globalization.CultureInfo.InvariantCulture,
@"FORMATNAME:DIRECT=OS:{0}\private$\mqsample", textBoxServer.Text));
//A recoverable message is created and the priority of the message
//is set accordingly.
System.Messaging.Message message = new System.Messaging.Message(cdOrder);
message.Recoverable = true;
//The response Queue is specified to receive acknowledgement from the
// server
message.ResponseQueue = new MessageQueue
(String.Format(System.Globalization.CultureInfo.InvariantCulture,
@"FORMATNAME:DIRECT=TCP:{0}\private$\mqdemoAck", deviceIP));
if (chkFast.Checked)
{
message.Priority = MessagePriority.High;
}
// Send the Message to the Queue
orderQueue.Send
(message, String.Format(System.Globalization.CultureInfo.InvariantCulture,
"CD Order ({0})", cdOrder.Customer.Contact));
this.ClearControls();
}
catch (FormatException ex)
{
MessageBox.Show(ex.Message, "Conversion Error");
this.ClearControls();
}
catch (System.Net.Sockets.SocketException ex)
{
MessageBox.Show
(String.Format(System.Globalization.CultureInfo.CurrentCulture,
"Failed to resolve Host Name:\n {0}", ex.Message));
this.ClearControls();
}
catch (MessageQueueException ex)
{
MessageBox.Show(ex.Message, "Error sending Message");
this.ClearControls();
}
finally
{
this.btnSubmit.Enabled = true;
}
}
/// <summary>
/// Function to update the ListBox with incoming CD Orders
/// </summary>
private void UpdateListBox(CDOrder order)
{
listBoxProc.Items.Add(order);
this.BackColor = Color.Green;
}
