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Note The code for this example is in the Exercise 7-2 bundle from the code download.
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The concept of this solution is shown in Figure 7-6. Since the entire Azure framework is based on the HTTP paradigm, if WCF client services are hosted in Azure and support HttpWebRequest, then both on-premises applications and cloud applications can post an HTTP message via HttpWebRequest to invoke the WCF service running in the cloud; WCF will also drive the workflows through HttpWebRequest.
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Figure 7-6. Using WCF services hosted in Azure to drive WF workflows via HttpWebRequest and HttpWebResponse
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CHAPTER 7 AZURE .NET SERVICES WORKFLOWS
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Having understood the big picture, let s get started building a WCF state machine workflow that supports HttpWebRequest. In order to be consistent, we use the shopping cart example we used in the previous exercise.
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Note A library WebHttpContext is required for this exercise. This library is defined in the
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Microsoft.ServiceModel.Samples namespace. The source code for this library comes with the source code
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package of this exercise.
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Create a State Machine Workflow Library project called ShoppingCartWorkflow from Visual Studio (as Figure 7-7 shows) and add a reference to the System.ServiceModel and System.ServiceModel.Web assemblies.
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Figure 7-7. Create a state machine workflow library project ShoppingCartWorkflow from Visual Studio 2. Add an interface, IShoppingCartService, to the project. This interface is the WCF service contract definition as shown in Listing 7-5. You may notice that the attributes of the operation contracts in the service interface definition are slightly different from those we have used in past chapters. The WebInvoke attribute has been attached to each operation contract in order to support HttpWebRequest. There are two parameters
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CHAPTER 7 AZURE .NET SERVICES WORKFLOWS
passed into the WebInvoke attribute, Method and UriTemplate. The value for Method could be either POST or PUT. The value of POST is used for inserting or deleting data, and the value of PUT is used for updating data. There are four methods defined in this interface: PlaceShoppingCartItem() UpdateShoppingCartItem() DeleteShoppingCartItem() PayShoppingCartItem() Listing 7-5. WCF Service Contract Interface Definition of IShoppingCartService using using using using using using using System; System.Collections.Generic; System.Linq; System.Text; System.ServiceModel; System.ServiceModel.Web; ShoppingCartServiceLibrary;
namespace ShoopingCartWorkflows { [ServiceContract] public interface IShoppingCartService { [OperationContract] [WebInvoke(Method="POST", UriTemplate="ShoppingCartItem")] ShoppingCartItem PlaceShoppingCartItem(ShoppingCartItem ShoppingCartItem); [OperationContract] [WebInvoke(Method = "PUT", UriTemplate = "ShoppingCartItem/{id}")] ShoppingCartItem UpdateShoppingCartItem(string id, ShoppingCartItem ShoppingCartItem); [OperationContract] [WebInvoke(Method = "POST", UriTemplate = "ShoppingCartItem/{id}")] ShoppingCartItem DeleteShoppingCartItem(string id, ShoppingCartItem ShoppingCartItem); [OperationContract] [WebInvoke(Method="PUT", UriTemplate="CreditCardPayment/ShoppingCartItem/{id}")] void PayShoppingCartItem(string id, CreditCardPayment CreditCardPayment); } }
CHAPTER 7 AZURE .NET SERVICES WORKFLOWS
Add a C# library project ShoppingCartServiceLibrary to implement the IShoppingCartService service contract and data contract as shown in Listing 7-6 and Listing 7-7. Listing 7-6 is the implementation for the service interface, and Listing 7-7 is the data contract used to hold the shopping card property data.
Listing 7-6. WCF IShoppingCartService Service Contract Implementation using using using using using System; System.Collections.Generic; System.Linq; System.Text; System.Runtime.Serialization;
namespace ShoppingCartServiceLibrary { [Serializable] [DataContract(Name="ShoppingCartItem", Namespace="http://costco.com/OnlineShopping")] public class ShoppingCartItem { static public string ENDPOINT_CREDITCARD_PAYMENT = "http://costco.com/OnlineShopping/CreditCardPayment/"; static public string ENDPOINT_ITEM_UPDATE = "http://costco.com/OnlineShopping/ShoppingCartItem/update/"; static public string ENDPOINT_ITEM_DELETE = "http://costco.com/OnlineShopping/ShoppingCartItem/delete/"; static public string CREDIT_CARD_PAYMENT_URI = "http://localhost:8000/CreditCardPayment/ShoppingCartItem/"; static public string SHOPPING_CART_URI = "http://localhost:8000/ShoppingCartItem/"; public string ShoppingCartItemId { get; set; } [DataMember(Name="ItemName")] public string ItemName { get; set; } [DataMember(Name="Price")] public decimal Price { get; set; } [DataMember(Name="NextItem")] public NextItem[] NextItem { get; set; } } [Serializable] [DataContract(Name="NextItem", Namespace="http://costco.com/OnlineShopping")] public class NextItem
CHAPTER 7 AZURE .NET SERVICES WORKFLOWS
{ [DataMember(Name="Relative")] public string Relative { get; set; } [DataMember(Name="uri")] public string Uri { get; set; } [DataMember(Name="type")] public string Type { get; set; } public NextItem() { Type = "application/xml"; } } } Listing 7-7. WCF IShoppingCartService Service Data Contract Implementations using using using using using System; System.Collections.Generic; System.Linq; System.Text; System.Runtime.Serialization;
namespace ShoppingCartServiceLibrary { [Serializable] [DataContract(Name = "CreditCardPayment", Namespace = "http://costco.com/OnlineShopping")] public class CreditCardPayment { public string ShoppingCartItemId { get; set; } [DataMember(Name = "CardNumber")] public string CardNumber { get; set; } [DataMember(Name = "ExpiresDate")] public string ExpiresDate { get; set; } [DataMember(Name = "CardHolerName")] public string CardHolerName { get; set; } [DataMember(Name = "amount")] public decimal ChargedAmount { get; set; } } }
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