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CHAPTER 13 CASE STUDY 3: A DISTRIBUTED WORKFLOW SYSTEM
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// convert an array of PriceItem arrays into a PricedItem array ArrayList items = new ArrayList(); foreach (PricedItem[] pricedItems in options) foreach (PricedItem pricedItem in pricedItems) items.Add(pricedItem); requestedOptions = items.ToArray(typeof(PricedItem)) as PricedItem[]; } else requestedOptions = new PricedItem[] {new PricedItem("Option1", 11), new PricedItem("Option2", 22) }; Color color = Color.FromName(comboBoxColors.Text); orderSystem.SubmitOrder(comboBoxModels.Text, comboBoxStyles.Text, color, requestedOptions); DisplayQueuedMessages(); } private void DisplayQueuedMessages() { listViewQueuedMessages.Items.Clear(); System.Messaging.Message[] messages = orderSystem.GetAllQueuedMessages(); System.Messaging.XmlMessageFormatter formatter; formatter = new System.Messaging.XmlMessageFormatter(new Type[] {typeof(WorkOrder)}); foreach (System.Messaging.Message message in messages) { message.Formatter = formatter; WorkOrder workOrder = message.Body as WorkOrder; ListViewItem item = new ListViewItem(workOrder.Model); item.SubItems.Add(workOrder.Style); item.SubItems.Add(workOrder.Color); string options = string.Empty; foreach (PricedItem option in workOrder.Options) options += option.Name + ";"; item.SubItems.Add(options); listViewQueuedMessages.Items.Add(item); } } private void buttonClearQueue_Click(object sender, System.EventArgs e) { orderSystem.ClearQueuedMessages(); DisplayQueuedMessages(); } private void buttonRefreshList_Click(object sender, System.EventArgs e) { DisplayQueuedMessages(); } }
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CHAPTER 13 CASE STUDY 3: A DISTRIBUTED WORKFLOW SYSTEM
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The OrderProcessor Hosting Component
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// app.config <configuration> <system.runtime.remoting> <application> <service> <wellknown type="OrderProcessor.OrderSystem, OrderProcessor " mode="Singleton" url="tcp://localhost:8011/AsapOrders"/> </service> </application> </system.runtime.remoting> </configuration> // class FormMain public class FormMain : System.Windows.Forms.Form { public FormMain() { InitializeComponent(); // configure the server component to listen for orders TcpChannel channel = new TcpChannel(8011); ChannelServices.RegisterChannel(channel); RemotingConfiguration.RegisterWellKnownServiceType( typeof(OrderSystem), "AsapOrders", WellKnownObjectMode.Singleton); } // [STAThread] static void Main() { Application.Run(new FormMain()); } private void timerOrdersReceived_Tick(object sender, System.EventArgs e) { UpdateOrdersReceived(); } int ordersReceived; void UpdateOrdersReceived() { int c = OrderSystem.OrdersReceived; if (c == ordersReceived) return;
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CHAPTER 13 CASE STUDY 3: A DISTRIBUTED WORKFLOW SYSTEM
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labelTotalOrdersReceived.Text = c.ToString(); ordersReceived = c; } }
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The OrderProcessor Component
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' class OrderSystem Public Class OrderSystem Inherits MarshalByRefObject Private Shared _ordersReceived As Integer Public Shared ReadOnly Property OrdersReceived() As Integer Get Return _ordersReceived End Get End Property Public Sub New() End Sub Private _router As Router Public ReadOnly Property Router() As Router Get If _router Is Nothing Then _router = New Router End If Return _router End Get End Property Public Function GetModels() As String() ' the following data would probably be fetched from a database Dim models As String() = New String() {"Model 1", "Model 2", "Model 3"} Return models End Function Public Function GetStyles(ByVal theModel As String) As String() ' the following data would probably be fetched from a database Dim styles As String() = New String() {"Style 1", "Style 2", "Style 3"} Return styles End Function
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CHAPTER 13 CASE STUDY 3: A DISTRIBUTED WORKFLOW SYSTEM
Public Function GetColors(ByVal theModel As String, _ ByVal theStyle As String) As Color() ' the following data would probably be fetched from a database Dim colors As Color() = New Color() {Color.White, Color.Navy, Color.Lavender} Return colors End Function ' each entry in the returned array is a PricedItem[] Public Function GetOptions(ByVal theModel As String, _ ByVal theStyle As String) As ArrayList ' the following data would probably be fetched from a database Dim options As New ArrayList Dim category1 As New ArrayList Dim category1Items As PricedItem() = New PricedItem() _ {New PricedItem("Category 1", 0), _ New PricedItem("Option 1", 111), _ New PricedItem("Option 2", 222), _ New PricedItem("Option 3", 333)} options.Add(category1Items) Dim category2 As New ArrayList Dim category2Items As PricedItem() = New PricedItem() _ {New PricedItem("Category 2", 0), _ New PricedItem("Option 11", 777), _ New PricedItem("Option 22", 888), _ New PricedItem("Option 33", 999)} options.Add(category2Items) Return options End Function Public Sub SubmitOrder(ByVal theModel As String, ByVal theStyle As String, _ ByVal theColor As Color, ByVal theOptions As PricedItem() ) Dim wo As New WorkOrder(theModel, theStyle, theColor, theOptions) Router.SubmitOrder(wo) _ordersReceived += 1 End Sub Public Function GetAllQueuedMessages() As System.Messaging.Message() Return Router.GetAllQueuedMessages() End Function Public Sub ClearQueuedMessages() Router.ClearQueuedMessages() End Sub End Class ' class Router Public Class Router Inherits System.ComponentModel.Component
CHAPTER 13 CASE STUDY 3: A DISTRIBUTED WORKFLOW SYSTEM
Public Sub SubmitOrder(ByVal theWorkOrder As WorkOrder) MessageQueueOrders.Send(theWorkOrder) End Sub Public Function GetAllQueuedMessages() As System.Messaging.Message() Return MessageQueueOrders.GetAllMessages() End Function Public Sub ClearQueuedMessages() MessageQueueOrders.Purge() End Sub ' End Class
The OrderProcessor Test Fixture Component
Public Class FormMain Inherits System.Windows.Forms.Form Private _orderSystem As New OrderSystem Public Sub New() MyBase.New() 'This call is required by the Windows Form Designer. InitializeComponent() ComboBoxColors.Items.Add("White") ComboBoxColors.SelectedIndex = 0 columnHeaderOptions.Width = -2 DisplayQueuedMessages() End Sub ' Private Sub ButtonGetModels_Click(ByVal sender As Object, _ ByVal e As System.EventArgs) _ Handles ButtonGetModels.Click Dim models As String() = _orderSystem.GetModels() ComboBoxModels.Items.Clear() If models Is Nothing Then Return For Each model As String In models ComboBoxModels.Items.Add(model) Next ComboBoxModels.SelectedIndex = 0 End Sub ' auto size last column
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