DESIGN PATTERNS FOR BUILDING SERVICE-ORIENTED WEB SERVICES in C#.NET

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CHAPTER 4 DESIGN PATTERNS FOR BUILDING SERVICE-ORIENTED WEB SERVICES
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return q; } } } As you would expect, the listing is very simple because the business assembly no longer has to provide its own implementation of the Quote request logic. In summary, service agents are an elegant solution when you need to interface with one or more external services and wish to isolate the code that handles the communication. Service agents provide stability to a business assembly by bearing the responsibility of ensuring successful calls to external services and returning results in a form that the business assembly natively understands. Service agents can also act as intermediaries between two or more Web services. This concludes the discussion of how to build basic service-oriented Web services.
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In this chapter, we expanded on the previous discussion of message-oriented Web services and showed you a six-step process for designing and building a service-oriented Web service from scratch: Step 1: Create a dedicated type definition assembly. Step 2: Create a dedicated business assembly. Step 3: Create the Web service using the type definition assembly. Step 4: Implement the business interface in the Web service. Step 5: Delegate processing logic to the business assembly. Step 6: Create a Web service client. You saw how to build both tightly coupled clients and loosely coupled clients. In most SOA applications you will want to build loosely coupled clients, but under some circumstances you may want a higher level of control over the type definitions. Tightly coupled clients reference the same type definition as the assembly rather than generating their own using a proxy class. Finally, we discussed the service agent component, which is a special feature of serviceoriented applications. The service agent manages communication between a business assembly and an external Web service. It can also act as the intermediary between two or more Web services. The goal of this chapter is to help you rethink your approach to Web services design so that you can start thinking in terms of SOA.
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CHAPTER
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Web Services Enhancements 3.0
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eb services technology has evolved rapidly since its debut a few years ago. Businesses were initially reluctant to fully adopt the technology because of a lack of industry-standard specifications to govern such important issues as message security and reliable delivery. Businesses will not send sensitive information across the wire if it is vulnerable to detection. And they will not implement large-scale distributed systems with this technology if the reliability of the messages cannot be guaranteed. This chapter lays the groundwork for the second half of the book, where we will focus intensively on how to implement WS- specifications using Microsoft s Web Services Enhancements 3.0 for .NET. This chapter includes the following: Overview of the WS- specifications Introduction to Web Services Enhancements (WSE) 3.0 Installing and configuring WSE 3.0, including the test certificates Using the WSE 3.0 utilities This chapter is a must-read in order to get the most out of the second half of the book. It will help you to understand the WS- specifications and how WSE fits into the context of SOA. It will also get you started with installing and configuring WSE 3.0, including the test certificates, which are required for many of the code samples.
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Overview of the WS- Specifications
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Web services technology was initially tailored toward point-to-point communication, based on the familiar HTTP request/response model in which a client request generates a timely server response. This model works well for Internet browsing, but it proves to be very limiting for distributed service applications. Web services that are involved in business processing cannot always generate a timely response. The business process may be long-running, or a required back-end system may be offline. In addition, the point-to-point communication model proves to be overly limiting for executing complex distributed business processes. It is unlikely that one Web service has the ability to execute a business process 100 percent of the time. More likely it needs to interact
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