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CHAPTER 7 INTERACTING WITH WORKFLOW
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static ReviewService LocalService; static void Main(string[] args) { using(WorkflowRuntime workflowRuntime = new WorkflowRuntime()) { LocalService = new ReviewService() ; workflowRuntime .AddService (LocalService); AutoResetEvent waitHandle = new AutoResetEvent(false); workflowRuntime.WorkflowCompleted += delegate(object sender, WorkflowCompletedEventArgs e) {waitHandle.Set();}; workflowRuntime.WorkflowTerminated += delegate(object sender, WorkflowTerminatedEventArgs e) { Console.WriteLine(e.Exception.Message); waitHandle.Set(); }; WorkflowInstance instance = workflowRuntime.CreateWorkflow(typeof (CCommunicationSequentialConsoleApplication.Workflow1)); instance.Start(); waitHandle.WaitOne(); } } After adding this code, the workflow runtime will recognize the ReviewService class as a service class that defines a communication channel with the workflow. Add a breakpoint to the second line of code just added. Also, open ReviewService.vb and add a breakpoint to the message box line. Execute the workflow. The first breakpoint is encountered, and the workflow runtime adds a copy of the ReviewService class to the runtime as a service. The workflow runtime then creates an instance of the workflow. The CallExternalMethod activity is encountered; then the message box within the CreateReview function is encountered. The message box appears with Reviewer: Me in it.
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This section will cover the Listen and HandleExternalEvent activities. These two activities wait for an event to be raised (Listen activity) and then handle that event (HandleExternalEvent activity). Open the VBCommunicationSequentialConsoleApplication again. The first step is to define an event or events within the interface for the service class. Open the ReviewService.vb class file and add the following two lines to the Interface declaration: Event ReviewApproved As EventHandler(Of ExternalDataEventArgs) Event ReviewNotApproved As EventHandler(Of ExternalDataEventArgs) The completed Interface declaration is as follows: Public Interface IReview Function CreateReview(ByVal Reviewer As String, ByVal Reviewee As String) As Boolean Event ReviewApproved As EventHandler(Of ExternalDataEventArgs) Event ReviewNotApproved As EventHandler(Of ExternalDataEventArgs) End Interface
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CHAPTER 7 INTERACTING WITH WORKFLOW
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Next, you must define the events within the ReviewService class. After the CreateReview function add the following four lines: Public Event ReviewApproved(ByVal sender As Object, ByVal e As ExternalDataEventArgs) Implements IReview.ReviewApproved Public Event ReviewNotApproved(ByVal sender As Object, ByVal e As ExternalDataEventArgs) Implements IReview.ReviewNotApproved These lines define an event within the class, and define which event within the interface each class-defined event will implement. The ReviewService class should now look like the following code: Public Function CreateReview(ByVal Reviewer As String, ByVal Reviewee As String) As Boolean Implements IReview.CreateReview MsgBox("Reviewer: " & StrReviewer) Return True End Function Public Event ReviewApproved(ByVal sender As Object, ByVal e As ExternalDataEventArgs) Implements IReview.ReviewApproved Public Event ReviewNotApproved(ByVal sender As Object, ByVal e As ExternalDataEventArgs) Implements IReview.ReviewNotApproved Next, you must add two subs to the class to handle the events: Private Sub ApproveReview(ByVal sender As Object, ByVal e As ExternalDataEventArgs) Handles Me.ReviewApproved MsgBox("Reviewer: " & StrReviewer & " has approved the review for " & StrReviewee) End Sub Private Sub DoNotApproveReview(ByVal sender As Object, ByVal e As ExternalDataEventArgs) Handles Me.ReviewNotApproved MsgBox("Reviewer: " & StrReviewer & " has not approved the review for " & StrReviewee) End Sub Notice the Handles keyword at the end of each line. This keyword ties this sub to an event defined within the class. When the event is raised, the sub will be called. After you ve defined the subs, you need to change the CreateReview function. First, add two declarations at the beginning of the class, one for StrReviewer and one for StrReviewee. Define both as a string. Next, you need to add a sub to ask the users if they approve or not, and to raise the correct event (either ReviewApproved or ReviewNotApproved). To do this, add the following code: Private Sub AskForApproval(ByVal o As Object) If MsgBox("Do you approve the review for: " & StrReviewee & " ", MsgBoxStyle.YesNo, "Approve review ") = MsgBoxResult.Yes Then RaiseEvent ReviewApproved(Nothing, Nothing) Else RaiseEvent ReviewNotApproved(Nothing, Nothing) End If End Sub
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CHAPTER 7 INTERACTING WITH WORKFLOW
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The RaiseEvent keyword causes the execution of the event following. If the user approves the review, then the ReviewApproved event is raised. Otherwise, the ReviewNotApproved event is raised. Finally, make changes to the CreateReview sub that call the newly created AskForApproval sub, but on a different thread: StrReviewer = Reviewer StrReviewee = Reviewee MsgBox("Reviewer: " & StrReviewer) ThreadPool.QueueUserWorkItem(New System.Threading.WaitCallback (AddressOf AskForApproval)) Return True The QueueUserWorkItem method of the ThreadPool creates a new thread and waits for the user to do something. That something is defined within the AskForApproval sub. The thread waits for the user to perform the action before continuing. The ReviewService.vb file should have the following code: <ExternalDataExchange()> _ Public Interface IReview Function CreateReview(ByVal Reviewer As String, ByVal Reviewee As String) As Boolean Event ReviewApproved As EventHandler(Of ExternalDataEventArgs) Event ReviewNotApproved As EventHandler(Of ExternalDataEventArgs) End Interface Public Class ReviewService : Implements IReview Private StrReviewer As String Private StrReviewee As String Public Function CreateReview(ByVal Reviewer As String, ByVal Reviewee As String) As Boolean Implements IReview.CreateReview StrReviewer = Reviewer StrReviewee = Reviewee MsgBox("Reviewer: " & StrReviewer) ThreadPool.QueueUserWorkItem(New System.Threading.WaitCallback (AddressOf AskForApproval)) Return True End Function Public Event ReviewApproved(ByVal sender As Object, ByVal e As ExternalDataEventArgs) Implements IReview.ReviewApproved Public Event ReviewNotApproved(ByVal sender As Object, ByVal e As ExternalDataEventArgs) Implements IReview.ReviewNotApproved Private Sub AskForApproval(ByVal o As Object) If MsgBox("Do you approve the review for: " & StrReviewee & " ", MsgBoxStyle.YesNo, "Approve review ") = MsgBoxResult.Yes Then RaiseEvent ReviewApproved(Nothing, Nothing) Else RaiseEvent ReviewNotApproved(Nothing, Nothing)
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