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CHAPTER 13 TRACKING
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namespace LeadGenerator { /*****************************************************/ // This custom activity creates a Lead class using // the input parameters (ContactName, ContactPhone, // Interests and Notes). A Lead record is inserted // into the database and then this is returned in // the Lead output parameter. /*****************************************************/ public sealed class CreateLead : CodeActivity { public InArgument<string> ContactName { get; set; } public InArgument<string> ContactPhone { get; set; } public InArgument<string> Interests { get; set; } public InArgument<string> Notes { get; set; } public InArgument<string> ConnectionString { get; set; } public OutArgument<Lead> Lead { get; set; } protected override void Execute(CodeActivityContext context) { // Create a Lead class and populate it with the input arguments Lead l = new Lead(); l.ContactName = ContactName.Get(context); l.ContactPhone = ContactPhone.Get(context); l.Interests = Interests.Get(context); l.Comments = Notes.Get(context); l.WorkflowID = context.WorkflowInstanceId; l.Status = "Open"; // Get the connection string DBExtension ext = context.GetExtension<DBExtension>(); if (ext == null) throw new InvalidProgramException("No connection string available"); // Insert a record into the Lead table LeadDataDataContext dc = new LeadDataDataContext(ext.ConnectionString); dc.Leads.InsertOnSubmit(l); dc.SubmitChanges(); // Store the request in the OutArgument Lead.Set(context, l); // Add a custom track record CustomTrackingRecord userRecord = new CustomTrackingRecord("New Lead") { Data = { {"Name", l.ContactName}, {"Phone", l.ContactPhone} } };
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// Emit the custom tracking record context.Track(userRecord); } } }
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Running the Application
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Press F5 to run the application. Enter a lead and then select it and assign an agent. A portion of the event log is shown in Figure 13-3. You can scroll through the ListBox and view all the events listed. All the tracking events start with Type:, and the type-specific data is found on subsequent lines and indented.
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Figure 13-3. Sample tracking events
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Event Tracing for Windows (ETW)
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The next tracking participant that you ll add writes the tracking events to the standard Windows Event Log. WF 4.0 provides an EtwTrackingParticipant class that provides this capability.
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Setting Up the Extension
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Open the AddLead.xaml.cs file and add the following class member: private EtwTrackingParticipant _etwTracking; This stores a reference to the tracking participant. Add the following code to the Loaded event handler. It calls a method that you ll implement shortly, which creates an instance of the tracking participant: CreateETWTrackingParticipant(); Add the following code to the SetupInstance() method that adds this participant as an extension to the workflow instance: i.Extensions.Add(_etwTracking);
CHAPTER 13 TRACKING
Configuring the TrackingProfile
Finally, add the following method to the AddLead class. This creates the EtwTrackingParticipant class and configures the TrackingProfile: private void CreateETWTrackingParticipant() { _etwTracking = new EtwTrackingParticipant() { TrackingProfile = new TrackingProfile() { Name = "EtwTrackingProfile", Queries = { new CustomTrackingQuery() { Name = "*", ActivityName = "*" } } } }; }
Tip To keep things simple, this participant tracks only the custom events. You can modify this code to track additional events if you want. The previous TrackingProfile that you configured tracked all four types of events, and I explained how to configure each of the corresponding queries. You could also copy and paste the code from the previous sample. If you had multiple tracking participants and you wanted each of them to track the same events, you could create a named instance of a TrackingProfile class and then reference the same instance for each of the participants.
Running the Application
Press F5 to run the application and enter a lead and close the application. Now run the Event Viewer application, which is usually under the Administrative Tools start menu. (You can usually find it in the Administrative Tools section of the Control Panel as well.) In the Event Viewer, open the Applications and Services Logs and then navigate to the Microsoft, Application Server-Applications, Analytic entry (see Figure 13-4).
CHAPTER 13 TRACKING
Figure 13-4. The Event Viewer application
Tip You may need to enable this log. In the Actions window (refer to Figure 13-4), if there is a link to Enable Log, click it to allow entries into this log.
There should be a single event corresponding to the lead you just created. If you select this event and click the Details tab, you should see a more readable view of this data, as shown in Figure 13-5.
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