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Correlation and Local Host Communication
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// Raise the event to trigger host activity. if (service != null) { service.RaiseTruckLeavingEvent(truckID, startingX, startingY); } // if } public void UpdateTruck(Int32 truckID, Int32 X, Int32 Y) { // Pull correlated service. WorkflowTruckTrackingDataService service = GetRegisteredWorkflowDataService( WorkflowEnvironment.WorkflowInstanceId, truckID); // Update data in correlated store. UpdateTruckData(service.InstanceID, truckID, X, Y); // Raise the event to trigger host activity. if (service != null) { service.RaiseRouteUpdatedEvent(truckID, X, Y); } // if } public void RemoveTruck(Int32 truckID) { // Pull correlated service. WorkflowTruckTrackingDataService service = GetRegisteredWorkflowDataService( WorkflowEnvironment.WorkflowInstanceId, truckID); // Remove truck from correlated store. string key = String.Format(KeyFormat, service.InstanceID, truckID); if (_dataValues.ContainsKey(key)) { // Remove it. _dataValues.Remove(key); } // if // Raise the event to trigger host activity. if (service != null) { service.RaiseTruckArrivedEvent(truckID); } // if }
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Part IV
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6. Following the methods in ITruckService are the events, so add those as well, following the methods from step 5:
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// Host-to-workflow events public event EventHandler<CancelTruckEventArgs> CancelTruck; public void RaiseCancelTruck(Guid instanceID, Int32 truckID) { if (CancelTruck != null) { // Fire event. CancelTruck(null, new CancelTruckEventArgs(instanceID, truckID)); } // if } public event EventHandler<AddTruckEventArgs> AddTruck; public void RaiseAddTruck(Guid instanceID, Int32 truckID, Int32 routeID) { if (AddTruck != null) { // Fire event. AddTruck(null, new AddTruckEventArgs(instanceID, truckID, routeID)); } // if }
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7. Looking back at the methods entered in step 5, you see a helper method used to insert the correlated data into the appropriate dictionary slot. The data itself must be converted to XML, so rather than proliferate this code in the three external methods, it s wrapped up in the UpdateTruckData helper method. Add that method now, following the events you just added:
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protected Truck UpdateTruckData(Guid instanceID, Int32 truckID, Int32 X, Int32 Y) { string key = String.Format(KeyFormat, instanceID, truckID); Truck truck = null; if (!_dataValues.ContainsKey(key)) { // Create new truck. truck = new Truck(); truck.ID = truckID; } // if else { // Pull existing truck. string serializedTruck = _dataValues[key]; StringReader rdr = new StringReader(serializedTruck); XmlSerializer serializer = new XmlSerializer(typeof(Truck)); truck = (Truck)serializer.Deserialize(rdr); } // else // Update values. truck.X = X; truck.Y = Y;
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Correlation and Local Host Communication
// Serialize values. StringBuilder sb = new StringBuilder(); using (StringWriter wtr = new StringWriter(sb)) { XmlSerializer serializer = new XmlSerializer(typeof(Truck)); serializer.Serialize(wtr, truck); } // using // Ship the data back... _dataValues[key] = sb.ToString(); return truck; }
8. Save the file. The entire TruckServiceDataConnector class is shown in Listing 17-2. Again, keep in mind that the purpose of this class is to store correlated data coming from the various workflow instances. The data is stored in a Dictionary object, the key for which is an amalgam of the workflow instance identifier and the truck identifier. Therefore, the data is keyed in a correlated fashion. The data connector class is a singleton service in the workflow runtime, so we have registration methods the individual workflow instance data services will use to identify themselves and establish their presence as far as data communication is concerned. Note You might wonder why the data being transferred is in XML rather than the data objects themselves. WF doesn t serialize objects when passed between workflow and host, or the reverse. As a result, copies of the objects are not created (undoubtedly to boost performance). Exchanged objects are passed by reference, so both workflow and host continue to work on the same object. If you don t want this behavior, as I did not for this sample application, you can serialize the objects as I have or implement ICloneable and pass copies. If this behavior doesn t affect your design, you don t need to do anything but pass your objects back and forth by reference. Keep in mind, though, that your objects will be shared by code executing on two different threads.
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