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CHAPTER 13 CASE STUDY 3: A DISTRIBUTED WORKFLOW SYSTEM
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public Router() { // messageQueueVehiclesToInvoice.BeginReceive(); } private void InitializeComponent() { this.messageQueueVehiclesToInvoice = new System.Messaging.MessageQueue(); // // messageQueueVehiclesToInvoice // this.messageQueueVehiclesToInvoice.Path = "FormatName:DIRECT=OS:alessandra\\private$\\asapvehiclestoinvoice"; this.messageQueueVehiclesToInvoice.ReceiveCompleted += new System.Messaging.ReceiveCompletedEventHandler(this.OrderReceived); } 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 = messageQueueVehiclesToInvoice.EndReceive(e.AsyncResult); msg.Formatter = formatter; WorkOrder workOrder = msg.Body as WorkOrder; // start waiting for the next message messageQueueVehiclesToInvoice.BeginReceive(); FireMessage(workOrder); } public delegate void MessageHandler(WorkOrder theWorkOrder); public event MessageHandler OnMessage; void FireMessage(WorkOrder theWorkOrder) { if (OnMessage != null) OnMessage(theWorkOrder); } }
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' class FormMain Public Class FormMain Inherits System.Windows.Forms.Form ' manages connections to incoming and outgoing message queues Private _router As Router
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CHAPTER 13 CASE STUDY 3: A DISTRIBUTED WORKFLOW SYSTEM
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Public Sub New() MyBase.New() '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
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' 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 ' Me.MessageQueueVehiclesToInvoice.Path = _ "FormatName:DIRECT=OS:alessandra\private$\asapvehiclestoinvoice"
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CHAPTER 13 CASE STUDY 3: A DISTRIBUTED WORKFLOW SYSTEM
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' 'MessageQueueVehiclesToAssemble ' Me.MessageQueueVehiclesToAssemble.Path = _ "FormatName:DIRECT=OS:alessandra\private$\asapvehiclestoassemble" End Sub 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
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Common Types Used in the System
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The ASAP Cars system, like most systems, relies on a series of UDTs that are used in many of the components. There are only two such UDTs in this case study, but a typical system contains many more. All these types are packaged together in a component called CommonTypes, as shown in Figure 13-21. By packaging all the commonly used types in a single component, the overall system s coupling is kept at a minimum. The coupling diagram in Figure 13-22 shows the components that are typecoupled to CommonTypes.
CHAPTER 13 CASE STUDY 3: A DISTRIBUTED WORKFLOW SYSTEM
CommonTypes
PricedItem
WorkOrder
Figure 13-21. The common user-defined types in CommonTypes
Order Processor
Parts Scheduling
CommonTypes
Invoicing
Vehicle Assembly
Figure 13-22. The type-coupling diagram of the system The star pattern shows that the system has ideal coupling. None of the outer components are coupled to each other. It is very important to note that the CommonTypes component is not coupled to any other components in the system. Since many components in the system are coupled to the component containing the shared UDTs, circular coupling may occur if a type were added to CommonTypes that type-coupled CommonTypes to other components.
CHAPTER 13 CASE STUDY 3: A DISTRIBUTED WORKFLOW SYSTEM
C# Code
// class PricedItem [Serializable] public class PricedItem { string name; public string Name { get {return name;} set {name = value;} } decimal cost; public decimal Cost { get {return cost;} set {cost = value;} } public override string ToString() { return name; } // public default constructor is required in serializable classes public PricedItem() { } public PricedItem(string theName, decimal theCost) { name = theName; cost = theCost; } } // class WorkOrder [Serializable] public class WorkOrder { string model; public string Model { get {return model;} set {model = value;} }
CHAPTER 13 CASE STUDY 3: A DISTRIBUTED WORKFLOW SYSTEM
string style; public string Style { get {return style;} set {style = value;} } string color; public string Color { get {return color;} set {color = value;} } PricedItem[] options; public PricedItem[] Options { get {return options;} set {options = value;} } string id; public string Id { get {return id;} set {id = value;} } // public default constructor is required in serializable classes public WorkOrder() { } public WorkOrder(string theModel, string theStyle, Color theColor, PricedItem[ ] theOptions) { model = theModel; style = theStyle; color = theColor.Name; options = theOptions; id = Guid.NewGuid().ToString(); } }
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