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Design Patterns for Building Service-Oriented Web Services
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Listing 4-10. The StockTrader Business Component Calling the Service Agent
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using System; using StockTraderTypes; using StockTraderServiceAgent; namespace StockTraderBusiness { public class StockTraderBusiness : StockTraderTypes.IStockTrader { public StockTraderBusiness() {} public Quote RequestQuote(string Symbol) { // Create a new Quote object Quote q = new Quote(); // Call the service agent StockTraderServiceAgent sa = new StockTraderServiceAgent(); q = sa.RequestQuote(Symbol); return q; } } }
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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, I expanded on the previous discussion of message-oriented Web services and showed you a six-step process for designing and building a serviceoriented Web service from scratch. These steps are 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, I discussed the service agent component, which is a special feature of service-oriented 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 service-oriented architecture.
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WEB 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 largescale distributed systems with this technology if the reliability of the messages cannot be guaranteed. 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. There are times when a Web service cannot send a timely and complete response to a client request. 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 with other systems and perhaps even with other Web services. Clearly, it is a problem if a Web service receives a request message, but then is unable to forward it on to other services for additional processing. Industry leaders have been working together for several years to address the current limitations with Web services technology. Standards committees have formed to bring a sense of order to the wide variety of available technologies and versions. In 1, I discussed the WS-I Basic Profile, which outlines a set of Web-related technologies by version number and groups them together into a standard profile. You are considered to be in compliance with this standard if you are implementing the exact technology versions in this profile. In addition, nonprofit organizations such as OASIS are important forums where companies are actively cooperating in the development and advancement of new standards and specifications. Companies, including Microsoft, IBM, BEA Systems, and VeriSign, are working on a set of specifications called the Web Service Specifications (WS-*) that are
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