| As corporate dependence on technology has grow more complex and far reaching ,the need for a method of integrating disparate applications into a unified set of business processes has emerged as a priority. After creating islands of automation through generations of technology, users and business managers are demanding that ways be found to bind these applications into a single, unified enterprise application. In spite of the growing hubbub and buzz around the newest generation of EAI and process automation products, many IT managers remain cautious about adopting them. Sure, there are a lot of project-related causes for these failures,but there is also something fundamental missing from the majority of available technology solutions that would greatly improve the odds at integration success-complete application interoperability.However, the Service-Oriented concept brings us a possibility to solve these problems. The traditional Middleware can be completely replaced by Web Service, as long as the interfaces been well-defined, Web services can be replaced with any other Web service follow the defined interface standard. This would resolve the long-standing tight coupling problem caused by industry middleware components. What is more important is that this loosely coupled Web Services will greatly enhance the reusability of components, Achieving the combination between Web Services becomes much easier.Therefore, thesis made the point that uses the system integration model based on BPEL to replace the traditional system integration models. Business process to be effective in converting the loose integration of Web services to logical and orderly combination of web services. This combination not only guaranteed the loosely coupled system, but also integrates those systems at another level. And according to the rules of BPEL4WS, a unified management of the life cycle of Web services, abnormal processing and comprehensive security mechanism can be established. |
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