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Correlation and Local Host Communication
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30. Scroll down through the source for Workflow1 and locate the constructor. Following the constructor, add these fields:
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private private private private private private bool _cancelTruck = false; TruckService.RouteInfo _routes = null; TruckService.Truck _myTruck = null; TruckService.Route _myRoute = null; TruckService.Destination _currentOrigin = null; TruckService.Destination _currentDestination = null;
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31. Following the fields you just added, you need to add two properties used for workflow initialization:
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public string Routes { set { // Deserialize route information. using (StringReader rdr = new StringReader(value)) { XmlSerializer serializer = new XmlSerializer(typeof(TruckService.RouteInfo)); _routes = (TruckService.RouteInfo)serializer.Deserialize(rdr); } // using } } public string TrackedTruck { set { // Deserialize truck information. using (StringReader rdr = new StringReader(value)) { XmlSerializer serializer = new XmlSerializer(typeof(TruckService.Truck)); _myTruck = (TruckService.Truck)serializer.Deserialize(rdr); } // using // Assign the truck ID. TruckID = _myTruck.ID; // Pull the route so we can retrieve the starting coordinates. foreach (TruckService.Route route in _routes.Routes) { // Check this route to see if it's ours. if (route.ID == _myTruck.RouteID) { // Ours, so save... _myRoute = route; break; } // if } // foreach // Pull origin. _currentOrigin = FindDestination(_myRoute.Start);
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// Pull destination or first waypoint. if (_myRoute.Waypoints.Length > 0) { // Pull first waypoint. _currentDestination = FindDestination(_myRoute.Waypoints[0].ID); } // if else { // No waypoints. _currentDestination = FindDestination(_myRoute.Stop); } // else // Assign the X and Y coordinates. CurrentX = _currentOrigin.X; CurrentY = _currentOrigin.Y; }
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32. The setter for the TrackedTruck property used a helper method, FindDestination. Add that following TrackedTruck:
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private TruckService.Destination FindDestination(Int32 id) { // Loop through the route destinations, looking for the // one we want... TruckService.Destination retVal = null; foreach (TruckService.Destination destination in _routes.Destinations) { // Check this destination. if (destination.ID == id) { // Got it. retVal = destination; break; } // if } // foreach return retVal; }
33. Scroll down through the dependency properties Visual Studio added, and locate the TestAtDestination method. To TestAtDestination, add the following:
// Check for cancel... if (_cancelTruck) { // Cancel immediately. e.Result = false; } else { // If the truck is within 3 pixels for both X and Y, we're at the // destination... e.Result = true; if (Math.Abs((double)_currentDestination.X - (double)CurrentX) < 3.0 &&
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Math.Abs((double)_currentDestination.Y - (double)CurrentY) < 3.0) { // Check for waypoints... if (_currentDestination.ID != _myRoute.Stop) { // Copy former destination to origin, and then // look up next waypoint destination. _currentOrigin = _currentDestination; TruckService.Waypoint waypoint = null; for (Int32 i = 0; i < _myRoute.Waypoints.Length; i++) { // Check to see if this is the current waypoint waypoint = _myRoute.Waypoints[i]; if (waypoint.ID == _currentOrigin.ID) { // Found the current waypoint, so assign the next. // waypoint to be the new destination. if ((i + 1) == _myRoute.Waypoints.Length) { // Last waypoint, head to true destination. _currentDestination = FindDestination(_myRoute.Stop); } // if else { // Next waypoint _currentDestination = FindDestination(_myRoute.Waypoints[i + 1].ID); } // else break; } // if } // for } // if else { // We've arrived... e.Result = false; } // else } // if } // else
34. To the CancelTruck method, add this code:
// Set the cancel flag. _cancelTruck = true;
35. Finally, add the simulation code itself to UpdateTruckPosition:
// Calculate slope for linear interpolation. // Y1 - Y2 // m = ------// X1 - X2 // // Solve for b: y = mx + b, so b = y - mx double m = ((double)_currentDestination.Y - (double)_currentOrigin.Y) / ((double)_currentDestination.X - (double)_currentOrigin.X);
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double b = (double)_currentDestination.Y (m * (double)_currentDestination.X); // With slope and intercept, we increment x to find the new y. Int32 multiplier = (_currentDestination.X - _currentOrigin.X) < 0 -1 : 1; CurrentX += (multiplier * 2); CurrentY = (Int32)((m * (double)CurrentX) + b);
36. Save all open files. 37. The workflow is now complete, but one last task remains for you to execute the application. The main application, TruckTracker, requires a reference to the workflow. So right-click the TruckTracker project, and select Add Reference. From the Projects tab, select TruckFlow and click OK. 38. Now you can compile the entire solution by pressing F6 or by selecting Build Solution from Visual Studio s Build menu option. Correct any compilation errors you encounter. 39. To execute the application, press Shift+F5, or just press F5 to run the application in debug mode. Add a truck by clicking Add Truck, selecting a route, and clicking OK. Add as many trucks as you like. To remove a truck, select it in the listview control and click Cancel Truck. The application s code isn t very different from what you saw in s 8 and 10. The one difference is when accessing the data for a given truck, you need to pass in the truck identifier for that vehicle. In some cases, that s even provided for you in the event arguments. If you want to continue to the next chapter, keep Visual Studio 2005 running and turn to 18, Invoking Web Services from Within Your Workflows. We ve been working with single-computer data long enough...it s time to branch out and hit the Web. If you want to stop, exit Visual Studio 2005 now, save your spot in the book, and close it. I m sure you re as excited about using Web services from your workflow as I am, but man doesn t live by work alone. Time for a break!
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