Like many other incipient technologies, Web services are still
surrounded by a substantial level of noise. This noise results from
the always dangerous combination of wishful thinking on the part of
research and industry and of a lack of clear understanding of how
Web services came to be. On the one hand, multiple contradictory
interpretations are created by the many attempts to realign
existing technology and strategies with Web services. On the other
hand, the emphasis on what could be done with Web services in the
future often makes us lose track of what can be really done with
Web services today and in the short term. These factors make it
extremely difficult to get a coherent picture of what Web services
are, what they contribute, and where they will be applied.
Alonso and his co-authors deliberately take a step back. Based on
their academic and industrial experience with middleware and
enterprise application integration systems, they describe the
fundamental concepts behind the notion of Web services and present
them as the natural evolution of conventional middleware, necessary
to meet the challenges of the Web and of B2B application
integration.
Rather than providing a reference guide or a "how to write your
first Web service" kind of book, they discuss the main objectives
of Web services, the challenges that must be faced to achieve them,
and the opportunities that this novel technology provides.
Established, as well as recently proposed, standards and techniques
(e.g., WSDL, UDDI, SOAP, WS-Coordination, WS-Transactions, and
BPEL), are then examined in the context of this discussion in order
to emphasize their scope, benefits, and shortcomings. Thus, the
book is ideally suited both for professionals considering the
development of application integration solutions and for research
and students interesting in understanding and contributing to the
evolution of enterprise application technologies.
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