Titlebook: Web Services; Concepts, Architectu Gustavo Alonso,Fabio Casati,Vijay Machiraju Textbook 2004 Springer-Verlag Berlin Heidelberg 2004 B2B.BPE

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Enterprise Application Integration treatment. As we saw in Chapter 2, middleware constitutes the basic infrastructure behind any distributed information system. Initially, middleware was used to construct new systems and to link to mainframe-based systems (2-tier architectures). Later, it was used to distribute the application logic

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Web Technologies however, is not limited to the systems within a single company. The same advantages that can be derived from automating a company’s business processes can be obtained from automating business processes encompassing several companies. Hence, it should not come as a surprise that there is as much int

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Web Servicess 2 and 3), and the basics of Web technology (Chapter 4). These chapters have shown a chronological evolution of the technology used for EAI and for building distributed applications. All these technologies have been rather successful in addressing several of the problems created by application inte

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Basic Web Services Technologyosely following a client/server model with an explicit name and directory service (the service registry). Albeit simple, such an architecture illustrates quite well the basic infrastructure necessary to implement Web services: a way to communicate (SOAP), a way to describe services (WSDL), and a nam

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Service coordination protocolsions where the client invokes a single operation on a Web service. When the interaction involves coordinated sequences of operations, additional abstractions and tools are needed to ensure the correctness and consistency of the interactions. This is no different from how conventional middleware evol

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Service Compositionrtain ordering constraints. We have discussed one of two implications of that observation: the need for coordination protocols and for middleware that helps define and enforce protocols. This chapter tackles the other implication, which is related to the . of Web services whose business logic involv

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Distributed Information Systemsuntered along the way, can be understood by considering how distributed information systems evolved in the past. As part of this evolution process, a key aspect to keep in mind is that while the technology has changed, the problems that need to be solved are to a large extent the same. Thus, the fir

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Middlewarethe problem of integrating a collection of servers and applications under a common service interface. Simple as this description is, it still covers a wide range of situations. Obviously, integrating two databases residing on the same LAN is not the same as integrating two complete 3-tier systems re