code to generate barcode in vb.net Part IV in C#

Maker UPCA in C# Part IV

Part IV
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External Data Communication
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4. Next add two fields and property pairs you ll need to identify correlated service instances:
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private Guid _instanceID = Guid.Empty; public Guid InstanceID { get { return _instanceID; } set { _instanceID = value; } } private Int32 _truckID = -1; public Int32 TruckID { get { return _truckID; } set { _truckID = value; } }
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5. Now we ll add two static methods: one to register the service and configure it within the workflow runtime, and another to retrieve a registered service instance:
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public static WorkflowTruckTrackingDataService CreateDataService(Guid instanceID, WorkflowRuntime workflowRuntime, Int32 truckID) { lock (_syncRoot) { // If we're just starting, save a copy of the workflow. // runtime reference. if (_workflowRuntime == null) { _workflowRuntime = workflowRuntime; } // if // If we're just starting, plug in ExternalDataExchange service. if (_dataExchangeService == null) { _dataExchangeService = new ExternalDataExchangeService(); _workflowRuntime.AddService(_dataExchangeService); } // if // Check to see if we have already added this data. // exchange service. TruckServiceDataConnector dataConnector = (TruckServiceDataConnector)workflowRuntime.GetService( typeof(TruckServiceDataConnector)); if (dataConnector == null) { _dataConnector = new TruckServiceDataConnector(); _dataExchangeService.AddService(_dataConnector); } // if else {
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17
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Correlation and Local Host Communication
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_dataConnector = dataConnector; } // else // Pull the service instance we registered with the connection // object. return WorkflowTruckTrackingDataService. GetRegisteredWorkflowDataService(instanceID, truckID); } // lock } public static WorkflowTruckTrackingDataService GetRegisteredWorkflowDataService(Guid instanceID, Int32 truckID) { lock (_syncRoot) { WorkflowTruckTrackingDataService workflowDataService = TruckServiceDataConnector.GetRegisteredWorkflowDataService( instanceID, truckID); if (workflowDataService == null) { workflowDataService = new WorkflowTruckTrackingDataService(instanceID, truckID); TruckServiceDataConnector.RegisterDataService( workflowDataService); } // if return workflowDataService; } // lock }
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6. Now add a constructor and destructor:
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private WorkflowTruckTrackingDataService(Guid instanceID, Int32 truckID) { this._instanceID = instanceID; this._truckID = truckID; } ~WorkflowTruckTrackingDataService() { // Clean up. _workflowRuntime = null; _dataExchangeService = null; _dataConnector = null; }
Note As you might recall from 8, the destructor is required to break circular links between the service and connector classes. Implementing IDisposable won t work for this because the Dispose method isn t called when the service is removed from the workflow runtime.
Part IV
External Data Communication
7. Following the class destructor, add the correlated data read method:
public string Read() { return _dataConnector.RetrieveTruckInfo(InstanceID, TruckID); }
8. Finally add the event implementations:
public void RaiseTruckLeavingEvent(Int32 truckID, Int32 startingX, Int32 startingY) { if (_workflowRuntime == null) _workflowRuntime = new WorkflowRuntime(); // Loads persisted workflow instances. _workflowRuntime.GetWorkflow(_instanceID); if (TruckLeaving != null) { TruckLeaving(this, new TruckActivityEventArgs(_instanceID, truckID, startingX, startingY)); } // if } public void RaiseRouteUpdatedEvent(Int32 truckID, Int32 X, Int32 Y) { if (_workflowRuntime == null) _workflowRuntime = new WorkflowRuntime(); // Loads persisted workflow instances. _workflowRuntime.GetWorkflow(_instanceID); if (RouteUpdated != null) { RouteUpdated(this, new TruckActivityEventArgs(_instanceID, truckID, X, Y)); } // if } public void RaiseTruckArrivedEvent(Int32 truckID) { if (_workflowRuntime == null) _workflowRuntime = new WorkflowRuntime(); // Loads persisted workflow instances. _workflowRuntime.GetWorkflow(_instanceID); if (TruckArrived != null) { TruckArrived(this, new TruckActivityEventArgs(_instanceID, truckID)); } // if }
17
Correlation and Local Host Communication
9. Save the file, and compile the TruckService project by pressing Shift+F6 or by selecting Build TruckService from Visual Studio s Build menu. Correct any compilation errors you receive. With the completion of the service class, the full listing for which is shown in Listing 17-3, the TruckService local communication service is done and ready to use. What we don t have is a workflow that uses the service. We ll also need to use the trusty wca.exe tool to create custom CallExternalMethod and HandleExternalEvent activities for us.
Listing 17-3
using using using using using
WorkflowTruckTrackingDataService.cs completed
System; System.Collections.Generic; System.Text; System.Workflow.Activities; System.Workflow.Runtime;
namespace TruckService { public class WorkflowTruckTrackingDataService { private static WorkflowRuntime _workflowRuntime = null; private static ExternalDataExchangeService _dataExchangeService = null; private static TruckServiceDataConnector _dataConnector = null; private static object _syncRoot = new object(); public event EventHandler<TruckActivityEventArgs> TruckLeaving; public event EventHandler<TruckActivityEventArgs> RouteUpdated; public event EventHandler<TruckActivityEventArgs> TruckArrived; private Guid _instanceID = Guid.Empty; public Guid InstanceID { get { return _instanceID; } set { _instanceID = value; } } private Int32 _truckID = -1; public Int32 TruckID { get { return _truckID; } set { _truckID = value; } } public static WorkflowTruckTrackingDataService CreateDataService(Guid instanceID, WorkflowRuntime workflowRuntime, Int32 truckID) { lock (_syncRoot) {
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