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CHAPTER 13 CASE STUDY 3: A DISTRIBUTED WORKFLOW SYSTEM
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The Parts Scheduler runs a background thread, keeping an eye on the parts list, to detect when a WorkOrder is ready for assembly. When it finds a WorkOrder that is ready, it is written to the AsapVehiclesToAssembly queue, where it will subsequently be picked up by the next workflow process, which is the VehicleAssembly component. Figure 13-16 shows the UI of the Parts Scheduling component.
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Figure 13-16. The UI of the Parts Scheduling component Figure 13-17 shows the wiring diagram for the Parts Scheduling system.
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ReceiveCompleted BeginReceive EndReceive ReceiveCompleted BeginReceive EndReceive OrderReceived
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Parts Scheduling
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NumberOf WorkOrders Message HandleOrder AddPart
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WorkerPartsList
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MessageQueue MessageQueue
Remove GetDeliveryDate GetWork ToAssemble TotalNumberOf ScheduledParts
Send
SubmitFor Assembly
Worker Parts List
Router
AsapVehicles ToAssemble Queue
Router
FormMain
Figure 13-17. The wiring diagram of the Parts Scheduling system The system uses class Router to encapsulate access to the remote message queues. Router contains no business logic. When an incoming message is posted to the AsapOrders queue, Router fires an event to FormMain. The event notification is sent on a background thread and contains a WorkOrder as the payload. FormMain gives the WorkOrder to WorkerPartsList, which stores the order in a Hashtable. FormMain runs a timer with one-second ticks. On each tick, FormMain checks WorkerPartsList for new orders. If any are found, they are added to the ListView on the right side of FormMain.
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; // manages a list of scheduled parts WorkerPartsList partsList = new WorkerPartsList(); public FormMain() { InitializeComponent(); System.Threading.Thread.CurrentThread.Name = "User Interface"; router = new Router(); router.OnMessage += new Router.MessageHandler(HandleOrder); Thread partsListMonitor = new Thread(new ThreadStart(CheckPartsList)); partsListMonitor.IsBackground = true; partsListMonitor.Name = "PartsListMonitor"; partsListMonitor.Start(); DisplayScheduledParts(); ShowVehiclesReadyForAssembly(); } bool removingPartsFromPartsList; void CheckPartsList() { while (true) { ArrayList workOrdersReady = partsList.GetWorkToAssemble(); if (workOrdersReady == null) { Thread.Sleep(100); continue; } else { // lock out DisplayScheduledParts from running temporarily removingPartsFromPartsList = true; // send all ready WorkOrders to next queue foreach (WorkOrder workOrder in workOrdersReady) { partsList.Remove(workOrder); router.SubmitForAssembly(workOrder); }
CHAPTER 13 CASE STUDY 3: A DISTRIBUTED WORKFLOW SYSTEM
removingPartsFromPartsList = false; } } } //
[STAThread] static void Main() { Application.Run(new FormMain()); } private void HandleOrder(WorkOrder theWorkOrder) { // a WorkerOrder has arrived. Add three parts for it, with // hard-coded delivery dates if (theWorkOrder == null) return; // pretend the work order has three parts partsList.AddPart(theWorkOrder, "Part 1", DateTime.Now.AddSeconds(3)); partsList.AddPart(theWorkOrder, "Part 2", DateTime.Now.AddSeconds(6)); partsList.AddPart(theWorkOrder, "Part 3", DateTime.Now.AddSeconds(9)); } private void timerUpdatePartsScheduled_Tick(object sender, System.EventArgs e) { DisplayScheduledParts(); ShowVehiclesReadyForAssembly(); } int scheduledPartsDisplayed = 0; private void DisplayScheduledParts() { if (removingPartsFromPartsList) return; // can't display the list while it's being changed if (scheduledPartsDisplayed == partsList.TotalNumberOfScheduledParts) return; listViewPartsSchedule.Items.Clear(); foreach (ArrayList parts in partsList.List.Values) { foreach (ScheduledPart part in parts) { ListViewItem item = new ListViewItem(part.workOrder.Id); item.SubItems.Add(part.part); item.SubItems.Add(part.deliveryDate.ToString("yyyy-MM-dd HH:mm:ss")); listViewPartsSchedule.Items.Add(item); }
CHAPTER 13 CASE STUDY 3: A DISTRIBUTED WORKFLOW SYSTEM
scheduledPartsDisplayed = partsList.TotalNumberOfScheduledParts; } } int vehiclesToAssembleDisplayed = 0; void ShowVehiclesReadyForAssembly() { System.Messaging.Message[] messages = router.GetVehicleAssemblyMessages(); if (vehiclesToAssembleDisplayed == messages.Length) return; System.Messaging.XmlMessageFormatter formatter; formatter = new System.Messaging.XmlMessageFormatter(new Type[] {typeof(WorkOrder)} ); listViewVehiclesToAssemble.Items.Clear(); foreach (System.Messaging.Message message in messages) { message.Formatter = formatter; WorkOrder workOrder = message.Body as WorkOrder; ListViewItem item = new ListViewItem(workOrder.Id); listViewVehiclesToAssemble.Items.Add(item); } vehiclesToAssembleDisplayed = messages.Length; } } // class ScheduledPart public class ScheduledPart { public WorkOrder workOrder; public string part; public DateTime deliveryDate; public string Id { get {return workOrder.Id;} } public ScheduledPart(WorkOrder theWorkOrder, string thePart, DateTime theDeliveryDate) { workOrder = theWorkOrder; part = thePart; deliveryDate = theDeliveryDate; } }
CHAPTER 13 CASE STUDY 3: A DISTRIBUTED WORKFLOW SYSTEM
// class WorkerPartsList public class WorkerPartsList { // key is WorkOrder ID, value is an ArrayList of ScheduledParts Hashtable partsList = new Hashtable(); public Hashtable List { get {return partsList;} } // number of WorkOrders that are waiting for parts public int NumberOfWorkOrders { get {return partsList.Count;} } // number of WorkOrders that are waiting for parts public int TotalNumberOfScheduledParts { get { int count = 0; foreach (ArrayList scheduledParts in partsList.Values) count += scheduledParts.Count; return count; } } public void AddPart(WorkOrder theWorkOrder, string thePart, DateTime theDeliveryDate) { ScheduledPart part = new ScheduledPart(theWorkOrder, thePart, theDeliveryDate); // see if this WorkOrder already has pending parts ArrayList pendingParts = partsList[theWorkOrder.Id] as ArrayList; if (pendingParts == null) { // no: create a new list and add it to the list pendingParts = new ArrayList(); partsList.Add(theWorkOrder.Id, pendingParts); } pendingParts.Add(part); } public void Remove(WorkOrder theWorkOrder) { partsList.Remove(theWorkOrder.Id); }
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