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There is no right way to implement security to protect addressing headers. Each of these options are recommended, rather than required. You need to make an individual determination as to whether security measures are required for your service-oriented application. At this point, you should be more comfortable with the concepts behind WS-Addressing, but you are probably still wondering exactly how to put these concepts, and the code, into action. Remember that WS-Addressing is a support specification that is built for messaging. The next section on messaging will provide you with the context for addressing by showing you the important role that addressing plays for messaging.

To implement the price history graph, you can use a new web form. The Source Code/Download area on the Apress web site (www.apress.com) contains the web form in a file called PH.aspx. This web form contains a single ZedGraph control. When you place a ZedGraph control from your Toolbox onto a web form, it draws the default chart you saw in Figure 10-13. You can see the PH.aspx page in the web form designer in Figure 10-14.

Traditional .asmx pages can still be used within WCF, which will interoperate with them in addition to supporting a newer form of Web service. ASP .NET-style Web services will continue to be limited within WCF to simple HTTP-based request/response message patterns. However, WCF Web services will provide all of the extended communication capabilities that WSE 3.0 provides (and more) including alternate transport protocols and true asynchronous and oneway communications. The characteristics of a WCF Web service are documented in the Windows Vista SDK as follows: Provides secure communication across any number of intermediaries, including firewalls Participates in widely distributed transactions Encapsulates two-way conversations that allow clients and servers to send messages in both directions Provides guarantees about the reliability of message delivery Supports situations requiring scalability, such as Web service farms Supports advanced features even with participants that are not built on Microsoft platforms Enables developers familiar with the .NET Framework to build messaging applications without knowing anything about XML or SOAP Enables developers familiar with XML Web services to leverage their XML, WSDL, and SOAP knowledge to work with XML messages described by XSD Supports smooth management of deployed applications

WSE 2.0 includes support for messaging, which provides developers with a new range of features for transporting and processing SOAP messages. Traditional XML Web services support the HTTP transport protocol only, which limits the client and server to communicating with a synchronous, Request/Response design pattern. WSE 2.0 messaging continues to support the HTTP protocol, but it also adds support for two additional transport protocols: TCP: A low-level protocol that communicates across processes and domain boundaries. Instant messenger and chat applications use the TCP protocol. In-Process: This protocol is designed for communications between components within the same application domain. It is an optimized, low-level protocol that provides the flexibility of TCP. In addition, WSE 2.0 provides classes that allow you to custom implement additional transport protocols, such as SMTP and MSMQ.

The ZedGraph control fires an event upon rendering, which occurs when the page is loaded or refreshed. This event is called RenderGraph. In this case, the page is going to take two parameters, one for the ticker of the stock to be rendered and the other for the number of days to render. These are used to make a call to the DataTier web service to get the DataTable back. The DataTable then loads the graph with the appropriate data.

Services that communicate over HTTP must reside on a Web server in order for their endpoints to be accessible. However, services that communicate over TCP

CHAPTER 9 BEYOND WSE 3.0: LOOKING AHEAD TO WINDOWS COMMUNICATION FOUNDATION (WCF)

The following code segment shows the full code for the ZedGraphWeb1_RenderGraph event handler:

9

WCF applications decouple the messaging and transport layer from the service layer, which allows you as the developer to focus on programming the service without having to worry about implementing the lower-level communications infrastructure. The service layer is built using the class framework that is provided by the WCF service model. It includes classes that allow you to interact programmatically with the messaging layer. In this section, we will review five important aspects of WCF that provide support for managing and processing service-oriented applications: The WCF service layer Ports Typed channels Service managers Transports and formatters

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