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CHAPTER 9 n COMMUNICATING WITH THE HOST APPLICATION
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new InvokeMethod { TargetType = typeof(ApplicationInterface), MethodName = "NewRequest", Parameters = { new InArgument<ReservationRequest>(env => request.Get(env)) } }, new WaitForInput<bool> { BookmarkName = "GetResponse", Input = new OutArgument<bool>(env => reserved.Get(env)) }, new CreateResponse { Request = new InArgument<ReservationRequest> (env => request.Get(env)), Reserved = new InArgument<bool>(env => reserved.Get(env)), Response = new OutArgument<ReservationResponse> (env => response.Get(env)) }, new WriteLine { Text = new InArgument<string>(env => "Sending response to: " + request.Get(env).Requester.BranchName), TextWriter = new InArgument<TextWriter> (env => Writer.Get(env)) }, new Send { OperationName = "RespondToRequest", ServiceContractName = "ILibraryReservation", EndpointAddress = new InArgument<Uri>( env => new Uri("http://localhost:" + request.Get(env).Requester.Address + "/ClientService")), Endpoint = new Endpoint { Binding = new BasicHttpBinding() }, Content = SendContent.Create (new InArgument<ReservationResponse>(response))
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} } }; } }
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This workflow is different from the version implemented in 8. Instead of starting with a Receive activity to get the incoming request, the ReservationRequest is passed in to the workflow using an input argument. The WriteLine activity that follows it acknowledges the incoming request.
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You used an InvokeMethod activity in 7 to call a method to compute the order discount. Now you ll use it to send data to the application. The ApplicationInterface class comes in really handy for this purpose. It enables the workflow to make a call into the application. The InvokeMethod activity calls the NewRequest() method of the ApplicationInterface class passing in the ReservationRequest class. Open the ApplicationInterface.cs file and add the following method, which simply calls the AddNewRequest() method in the application: public static void NewRequest(ReservationRequest request) { if (_app != null) _app.AddNewRequest(request); } The next activity is the custom WaitForInput activity that you used in the SendRequest workflow. This time, it is expecting a bool input to indicate whether the title was reserved. The CreateResponse and WriteLine activities are the same as was used in 8. In 8, you used a SendReply activity because it was associated with the initial Receive activity. In this project, because there is no Receive activity, you ll use a Send activity. Notice that the EndpointAddress is set up using the address (port number) provided in the input request.
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Implementing the Application
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The last step is to implement the application. There are several event handlers that must be implemented as well as the methods invoked by the static ApplicationInterface class.
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Maintaining Workflow Instances
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The application has to keep track of the workflow instances so it can resume the correct instance. You can accomplish this fairly easily by using a Dictionary object. Open the Reservations.xaml.cs file and add the following class members just below the ServiceHost member: private IDictionary<Guid, WorkflowApplication> _incomingRequests; private IDictionary<Guid, WorkflowApplication> _outgoingRequests; These use the workflow s instance ID as the dictionary key and the WorkflowApplication object as the value. Because the application handles both the SendRequest and ProcessRequest workflows, you ll need two Dictionary objects. Add the following code to the constructor to initialize these objects: _incomingRequests = new Dictionary<Guid, WorkflowApplication>(); _outgoingRequests = new Dictionary<Guid, WorkflowApplication>(); There is also one small change that you ll need to make to the custom CreateRequest activity. The workflow instance ID must be used as the RequestID field of the ReservationRequest class. The application will use this when resuming the workflow. Open the CreateRequest.cs file and modify the call that creates the ReservationRequest class to use the alternate constructor that takes a fifth parameter for the RequestID. Add the line in bold from the following code snippet: // Create a ReservationRequest class and populate // it with the input arguments
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CHAPTER 9 n COMMUNICATING WITH THE HOST APPLICATION
ReservationRequest r = new ReservationRequest ( Title.Get(context), Author.Get(context), ISBN.Get(context), new Branch { BranchName = app.Settings["Branch Name"].Value, BranchID = new Guid(app.Settings["ID"].Value), Address = app.Settings["Address"].Value }, context.WorkflowInstanceId );
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