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CHAPTER 8 SEND AND RECEIVE
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{ Text = new InArgument<string> (env => "Sending response to: " + request.Get(env).Requester.BranchName), }, new SendReply { Request = receiveRequest, Content = SendContent.Create (new InArgument<ReservationResponse>(response)) } } }; } } }
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The last step of building this solution is to implement the host application. You ll use the console application (Program.cs) that was generated by the template. The application both initiates and processes requests, so you ll need to supply the logic for both. First, you ll set up the application to listen for and process incoming requests. Then you ll initiate a new request that is sent to another application instance. Add the following namespaces to the Program.cs file: using using using using using using using System.ServiceModel; System.ServiceModel.Activities; System.ServiceModel.Activities.Description; System.ServiceModel.Description; System.Activities; System.Xml.Linq; System.Configuration;
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WorkflowServiceHost
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If you have used WCF before, you may be familiar with the ServiceHost class, which is used to listen for incoming messages. WF 4.0 provides a WorkflowServiceHost class that implements a ServiceHost but initiates a workflow when a message is received. Enter the code in Listing 8-13 as the implementation of the main() function of the Program class. Listing 8-13. Partial Implementation on the main() Function // Open the config file and get the name for this branch // and its network address Configuration config = ConfigurationManager .OpenExeConfiguration(ConfigurationUserLevel.None); AppSettingsSection app =
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CHAPTER 8 SEND AND RECEIVE
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(AppSettingsSection)config.GetSection("appSettings"); string adr = app.Settings["Address"].Value; Console.WriteLine(app.Settings["Branch Name"].Value); // Create a service to handle incoming requests WorkflowService service = new WorkflowService { Name = "LibraryReservation", Body = new ProcessRequest(), Endpoints = { new Endpoint { ServiceContractName="ILibraryReservation", AddressUri = new Uri("http://localhost:" + adr + "/LibraryReservation"), Binding = new BasicHttpBinding(), } } }; // Create a WorkflowServiceHost that listens for incoming messages System.ServiceModel.Activities.WorkflowServiceHost wsh = new System.ServiceModel.Activities.WorkflowServiceHost(service); wsh.Open(); This code first opens the application configuration file and retrieves the Address setting, which specifies the port number that the application will listen on. It also gets the branch name, which is displayed in the console window. Because you ll have multiple applications running, this will help you keep track of which one is which.
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It then creates a WorkflowService class . For the Body property, it uses a new instance of the ProcessRequest class that defines the workflow used to process incoming requests.
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Endpoint
The Service class also defines the endpoint using the ILibraryReservation service contract, a URI that includes the variable port number and the BasicHttpBinding class. Finally, a WorkflowServiceHost class is instantiated using the defined service class. It is then opened by calling its Open() method. At this point, the application is listening for incoming messages. When one is received, an instance of the ProcessRequest workflow is started to handle the request.
CHAPTER 8 SEND AND RECEIVE
WorkflowInvoker
Now you ll need to add code to initiate a request. Enter the code shown in Listing 8-14 just after the call to wsh.Open(). Listing 8-14. Remaining Implementation of the main() Function Console.WriteLine ("Waiting for requests, press ENTER to send a request."); Console.ReadLine(); // Create dictionary with input arguments for the workflow IDictionary<string, object> input = new Dictionary<string, object> { { "Title" , "Gone with the Wind" }, { "Author", "Margaret Mitchell" }, { "ISBN", "9781416548898" } }; // Invoke the SendRequest workflow IDictionary<string, object> output = WorkflowInvoker.Invoke(new SendRequest(), input); ReservationResponse resp = (ReservationResponse)output["Response"]; // Display the response Console.WriteLine("Response received from the {0} branch", resp.Provider.BranchName); Console.WriteLine(); Console.WriteLine("Press ENTER to exit"); Console.ReadLine(); // Close the WorkflowServiceHost wsh.Close(); This code waits for the user to press the Enter key, which will give you time to get multiple copies running and listening for incoming messages. The remaining code should be familiar because it is very similar to the code you wrote in s 4 7. You first create a Dictionary to hold the input arguments. It then uses the Invoke() method of the WorkflowInvoker class to start a new instance of the SendRequest workflow. The Response output argument is then extracted from the Dictionary that is returned when the workflow completes. The name of the branch that responded to the request is displayed in the console. Finally, the WorkflowServiceHost is closed before the application exits. The complete implementation of Program.cs is provided in Listing 8-15. Listing 8-15. Complete Implementation of Program.cs using using using using System; System.Collections.Generic; System.Linq; System.Text;
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