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Router
AsapVehiclesTo InvoiceQueue
Router
FormMain
Figure 13-18. The wiring diagram of the Vehicle Assembly system FormMain is the UI component of Vehicle Assembly. In a production system, the UI would show all the details about the vehicle assembly process. In this example, the UI is just a blank form.
CHAPTER 13 CASE STUDY 3: A DISTRIBUTED WORKFLOW SYSTEM
C# Code
// class FormMain public class FormMain : System.Windows.Forms.Form { // // manages connections to incoming and outgoing message queues Router router; public FormMain() { InitializeComponent(); router = new Router(); router.OnMessage += new Router.MessageHandler(HandleOrder); } private void HandleOrder(WorkOrder theWorkOrder) { // a WorkerOrder has arrived. Skip the actual vehicle // assembly details and just issue an invoice router.SubmitForInvoicing(theWorkOrder); } // }
// class Router public class Router : System.ComponentModel.Component { private System.Messaging.MessageQueue messageQueueVehiclesToAssemble; private System.Messaging.MessageQueue messageQueueVehiclesToInvoice; // public Router() { // messageQueueVehiclesToAssemble.BeginReceive(); } private void InitializeComponent() { this.messageQueueVehiclesToAssemble = new System.Messaging.MessageQueue(); this.messageQueueVehiclesToInvoice = new System.Messaging.MessageQueue(); // // messageQueueVehiclesToAssemble // this.messageQueueVehiclesToAssemble.Path = "FormatName:DIRECT=OS:alessandra\\private$\\asapvehiclestoassemble";
CHAPTER 13 CASE STUDY 3: A DISTRIBUTED WORKFLOW SYSTEM
this.messageQueueVehiclesToAssemble.ReceiveCompleted += new System.Messaging.ReceiveCompletedEventHandler(this.OrderReceived); // // messageQueueVehiclesToInvoice // this.messageQueueVehiclesToInvoice.Path = "FormatName:DIRECT=OS:alessandra\\private$\\asapvehiclestoinvoice"; } public void SubmitForInvoicing(WorkOrder theWorkOrder) { messageQueueVehiclesToInvoice.Send(theWorkOrder); } private void OrderReceived(object sender, System.Messaging.ReceiveCompletedEventArgs e) { System.Messaging.XmlMessageFormatter formatter = new System.Messaging.XmlMessageFormatter(new Type[] {typeof(WorkOrder) } ); System.Messaging.Message msg = messageQueueVehiclesToAssemble.EndReceive(e.AsyncResult); msg.Formatter = formatter; WorkOrder workOrder = msg.Body as WorkOrder; // start waiting for the next message messageQueueVehiclesToAssemble.BeginReceive(); FireMessage(workOrder); } public delegate void MessageHandler(WorkOrder theWorkOrder); public event MessageHandler OnMessage; void FireMessage(WorkOrder theWorkOrder) { if (OnMessage != null) OnMessage(theWorkOrder); } }
VB .NET Code
' class FormMain
Public Class FormMain Inherits System.Windows.Forms.Form ' manages connections to incoming and outgoing message queues Private _router As Router Public Sub New() MyBase.New()
CHAPTER 13 CASE STUDY 3: A DISTRIBUTED WORKFLOW SYSTEM
'This call is required by the Windows Form Designer. InitializeComponent() _router = New Router AddHandler _router.OnMessage, AddressOf HandleOrder End Sub Private Sub HandleOrder(ByVal theWorkOrder As WorkOrder) ' a WorkerOrder has arrived. Skip the actual vehicle ' assembly details and just issue an invoice _router.SubmitForInvoicing(theWorkOrder) End Sub ' End Class ' class Router
Public Class Router Inherits System.ComponentModel.Component Public Sub New(ByVal Container As System.ComponentModel.IContainer) MyClass.New() 'Required for Windows.Forms Class Composition Designer support Container.Add(Me) MessageQueueVehiclesToAssemble.BeginReceive() End Sub Public Sub New() MyBase.New() 'This call is required by the Component Designer. InitializeComponent() MessageQueueVehiclesToAssemble.BeginReceive() End Sub ' Private Sub InitializeComponent() Me.MessageQueueVehiclesToInvoice = New System.Messaging.MessageQueue Me.MessageQueueVehiclesToAssemble = New System.Messaging.MessageQueue ' 'MessageQueueVehiclesToInvoice
CHAPTER 13 CASE STUDY 3: A DISTRIBUTED WORKFLOW SYSTEM
' Me.MessageQueueVehiclesToInvoice.Path = _ "FormatName:DIRECT=OS:alessandra\private$\asapvehiclestoinvoice" ' 'MessageQueueVehiclesToAssemble ' Me.MessageQueueVehiclesToAssemble.Path = _ "FormatName:DIRECT=OS:alessandra\private$\asapvehiclestoassemble" End Sub #End Region Public Sub SubmitForInvoicing(ByVal theWorkOrder As WorkOrder) MessageQueueVehiclesToInvoice.Send(theWorkOrder) End Sub Private Sub MessageQueueVehiclesToAssemble_ReceiveCompleted( _ ByVal sender As Object, _ ByVal e As System.Messaging.ReceiveCompletedEventArgs) _ Handles MessageQueueVehiclesToAssemble.ReceiveCompleted Dim formatter As New System.Messaging.XmlMessageFormatter( _ New Type() {GetType(WorkOrder)}) Dim msg As System.Messaging.Message = _ MessageQueueVehiclesToAssemble.EndReceive(e.AsyncResult) msg.Formatter = formatter Dim wo As WorkOrder = DirectCast(msg.Body, WorkOrder) ' start waiting for the next message MessageQueueVehiclesToAssemble.BeginReceive() FireMessage(wo) End Sub Public Event OnMessage(ByVal theWorkOrder As WorkOrder) Private Sub FireMessage(ByVal theWorkOrder As WorkOrder) RaiseEvent OnMessage(theWorkOrder) End Sub End Class
The Invoicing Component
When the Vehicle Assembly component posts a WorkOrder to the AsapVehiclesToInvoice queue, a notification is sent to the Invoicing component, which in a production system would generate the invoice, print it, and send it to the customer. In this simplified case study, the Invoicing component limits itself to displaying some information on the screen about the vehicle ordered, as shown in Figure 13-19.
CHAPTER 13 CASE STUDY 3: A DISTRIBUTED WORKFLOW SYSTEM
Figure 13-19. The UI of the Invoicing component The details regarding the actual generation of an invoice are not of particular interest here and were omitted. The design of the Invoicing component is fairly straightforward and has much in common with the Vehicle Assembly system, as you can see from the wiring diagram in Figure 13-20.
MSMQ
ReceiveCompleted ReceiveCompleted BeginReceive OrderReceived
MessageQueue
Invoicing
Message HandleOrder
BeginReceive EndReceive
EndReceive
Router
AsapVehiclesToInvoice Queue
FormMain
Figure 13-20. The wiring diagram of the Invoicing component
C# Code
// class FormMain public class FormMain : System.Windows.Forms.Form { // // manages connections to incoming and outgoing message queues Router router; public FormMain() { InitializeComponent(); System.Threading.Thread.CurrentThread.Name = "User Interface";
CHAPTER 13 CASE STUDY 3: A DISTRIBUTED WORKFLOW SYSTEM
router = new Router(); router.OnMessage += new Router.MessageHandler(HandleOrder); } delegate void WorkOrderHandler(WorkOrder theWorkOrder); private void HandleOrder(WorkOrder theWorkOrder) { // process order on the UI thread this.Invoke(new WorkOrderHandler(DoHandleOrder), new object[] {theWorkOrder}); } int invoiceCount = 0; private void DoHandleOrder(WorkOrder theWorkOrder) { // just update the displayed info invoiceCount++; labelInvoicesGenerated.Text = invoiceCount.ToString(); labelModel.Text = theWorkOrder.Model; labelStyle.Text = theWorkOrder.Style; labelColor.Text = theWorkOrder.Color; string options = string.Empty; for (int i = 0; i < theWorkOrder.Options.Length; i++) options += string.Format("{0};", theWorkOrder.Options[i].Name); labelOptions.Text = options; }
[STAThread] static void Main() { Application.Run(new FormMain()); } }
// class Router public class Router : System.ComponentModel.Component { private System.Messaging.MessageQueue messageQueueVehiclesToInvoice; //
public Router(System.ComponentModel.IContainer container) { // messageQueueVehiclesToInvoice.BeginReceive(); }
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