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CHAPTER 8 SEND AND RECEIVE
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The submitRequest instance is defined as a Send activity. The Send activity uses WCF to send a message to the specified endpoint. You probably recognized the three pieces of information needed to specify an endpoint: ServiceContractName specified as ILibraryReservation EndpointAddress specified as a URL with a variable port number Binding specified with the BasicHttpBinding class
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In addition, there are a few more properties that must be defined. OperationName indicates the specific method of the service contract that should be called at the destination when the message is received. The Content property stores a reference to the message (a ReservationRequest class) that is to be sent.
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Custom Activity CreateRequest
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You will now create a custom activity that will build the request message from the arguments passed in to the workflow. In the Solution Explorer, right click the LibraryReservation project and choose Add Class. Enter the class name as CreateRequest.cs. The implementation of this class is shown in Listing 8-7. Listing 8-7. Implementation of CreateRequest using System; using System.Activities; using System.Configuration; namespace LibraryReservation { /*****************************************************/ // This custom activity creates a ReservationRequest // class using the input parameters (Title, Author and // ISBN). This is provided in the Request output // parameter. It also returns the network address of // the branch that the request should be sent to. /*****************************************************/ public sealed class CreateRequest : CodeActivity { public InArgument<string> Title { get; set; } public InArgument<string> Author { get; set; } public InArgument<string> ISBN { get; set; } public OutArgument<ReservationRequest> Request { get; set; } public OutArgument<string> RequestAddress { get; set; } protected override void Execute(CodeActivityContext context) { // Open the config file and get the Request Address Configuration config = ConfigurationManager .OpenExeConfiguration(ConfigurationUserLevel.None);
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CHAPTER 8 SEND AND RECEIVE
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AppSettingsSection app = (AppSettingsSection)config.GetSection("appSettings"); // Create a ReservationRequest class and populate // it with the input arguments 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 } ); // Store the request in the OutArgument Request.Set(context, r); // Store the address in the OutArgument RequestAddress.Set(context, app.Settings["Request Address"].Value); } } } The Execute() method first opens the application configuration file to determine the branch details that are needed to format the request. It then creates a ReservationRequest class using one of the constructors you provided. The Branch class, which is one of the constructor parameters, is created as an anonymous class by specifying the BranchName, BranchID, and Address properties. The ReservationRequest class is then stored in the Request output parameter. The Request Address in the configuration file contains the address (port number) of the branch that will be receiving the request. It is stored in the RequestAddress output argument because it will be needed by the workflow. Go back to the ReservationWF.cs file. Add the workflow definition shown in Listing 8-8. This should go where the placeholder is (// Define the SendRequest workflow). Listing 8-8. Completed Implementation of the SendRequest workflow // Define the SendRequest workflow this.Implementation = () => new Sequence { DisplayName = "SendRequest", Variables = { request, requestAddress}, Activities = { new CreateRequest {
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CHAPTER 8 SEND AND RECEIVE
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Title = new InArgument<string>(env => Title.Get(env)), Author = new InArgument<string>(env => Author.Get(env)), ISBN = new InArgument<string>(env => ISBN.Get(env)), Request = new OutArgument<ReservationRequest> (env => request.Get(env)), RequestAddress = new OutArgument<string> (env => requestAddress.Get(env)) }, new CorrelationScope { Body = new Sequence { Activities = { submitRequest, new WriteLine { Text = new InArgument<string> (env => "Request sent; waiting for response"), }, new ReceiveReply { Request = submitRequest, Content = ReceiveContent.Create (new OutArgument<ReservationResponse> (env => Response.Get(env))) } } } }, new WriteLine { Text = new InArgument<string> (env => "Response received from " + Response.Get(env).Provider.BranchName), }, } }; The Implementation property of an activity class (referred to as this.Implementation) contains the child activity. In this case, it is defined as a Sequence activity that consists of a number of child activities. The variables used by these activities must be declared. They are the request and requestAddressvariables that were defined in the constructor. The first activity is the custom CreateRequest activity that you just implemented. Notice that as you re specifying the properties, Intellisense knows the input and output arguments that you defined in your class. The Title, Author, and ISBN arguments are set to the input arguments of the workflow. The Request and RequestAddress output arguments are stored in the workflow variables. A CorrelationScope activity is added next, which contains a sequence of activities. Specifically, it contains the Send and the ReceiveReply activities. By placing them inside a CorrelationScope activity, the workflow will correlate the response message with the correct workflow instance. A WriteLine activity is added after the Send activity to indicate that the request has been sent.
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