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Conclusion In this chapter, we reviewed the standards that together are commonly referred to as Web Services. These standards have been developed to address some of the heterogeneity problems that resulted from the use of different technologies, such as the following:
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No common way to describe the service interface and other characteristics. No common place to look up what services are available. No common way for a data exchange between applications that is independent of languages and middleware technologies. No common message format for exchanging information between applications. No way to specify different communication protocols.
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The standards we discussed are XML, SOAP, WSDL, UDDI, and WS-I Basic Profile. XML provides a middleware-independent format for the exchange of data and documents. SOAP provides a common message format for application interaction. WSDL provides a language- and platform-independent way to specify the interface offered by a service. A WSDL document consists of two parts. The first part describes in an abstract manner the operations, input and output parameters, and data types. The second part, which consists of a binding and implementation interface, specifies the transport protocol, message format, and service end point network address. The Universal Description, Discovery, and Integration (UDDI) specification defines a standard way of registering, deregistering, and looking up services. The last standard, WS-I Basic Profile, promotes the interoperability of services operating on different platforms by specifying additional constraints and clarifications on the aforementioned standards. In Part IV of this book (s 11 14), we take a more detailed look at these standards. Although these standards, known as Web Services, are able to solve some of the heterogeneity problems, they are not able to solve all of these types of problems. Some of the heterogeneity problems not addressed by Web Services standards include the following:
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Protocol mismatch Related to the heterogeneity of communication protocols is the problem that different applications want to communicate with each other using incompatible protocols. For example, Application A might want to communicate with Application B using HTTP. However, for Application B the suitable protocol might be IIOP. In such cases, a protocol transformation is needed so that Application A can communicate with Application B.
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Message format mismatch Related to protocol mismatch is the problem of a mismatch of message formats between the service provider and the service consumer. This problem refers to the situation where a service provider may be set up to receive messages in one format (such as SOAP), while the service consumer is set up to use another message format (such as Java RMI).
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These and other problems have been addressed by further development in the technologies. In particular, the evolution of Enterprise Service Bus patterns solves many of the remaining heterogeneity problems as well as other problems. We discuss these problems and the Enterprise Service Bus in the next chapter.
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7 provided an overview of the standards generally known as Web Services. The main objective of these standards is to provide a solution to the various heterogeneity problems found in large enterprises. Toward the end of 7, you learned that Web Services can provide only a part of the solution and that some heterogeneity problems are still left unresolved. In particular, quite often there is a need to provide a mechanism for a communication protocol switch and to provide a mechanism for data transformation in order to match the requirements of a service provider with that of a service client. In this chapter, we tackle the remaining heterogeneity problems by discussing the Enterprise Service Bus (ESB) pattern. ESB provides a comprehensive, scalable way to connect a large number of applications without the need for each pair of applications to make a direct connection. Such a direct connection between two applications is called a point-to-point connection. Note that even in the case of Web Services, the connection between the service consumer application and the service provider application is point to point. The point-to-point connection approach does not scale well because the number of applications involved in the integration increase; therefore, this integration approach is not suitable for a large enterprise where a large number of applications need to be integrated. We start this chapter with a brief overview of the scalability problem and how an ESB pattern solves this problem by using content- and context-based routing. We also elaborate on the solutions of the heterogeneity problems that have not been addressed yet. Then, we summarize the core functions supported by an ESB and provide a brief discussion of the optional features that are sometimes available in an ESB. Next, we describe the various logical components of an ESB and how an ESB works. The various abstract ESB deployment patterns are discussed next.
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