The Study Of Method And Algorithm For Web Service Workflow Rebuilding

Web services around the network environment have many complicatedly and diversified elements. At the same time, usability of the Web services often changes dynamically. Users expect to propose the more personalized demands anytime and anywhere in the experience service flow process. All above possibly cause Web services workflow complicated. Exception may occur while the initial service workflow is executing. So the workflow can't achieve its target. The existing Web services workflow mechanism lacks solution to this kind of questions. In order to solve the problems above, this article proposes the Web services workflow rebuilding concept. The Web services workflow rebuilding technology uses unusual flow information and users additional demand information to look for, transfer, and compose available Web service to modify parts of initial flow in the process. It can guarantees the work class smooth execution. It is also a expansion research of dynamic workflow in Web the service domain.This article, based on the ideas that the author developed in National Natural Science Fund sponsored project 'Research of Smartflow Pattern', mainly focuses on the problems of how to rebuild the follow-up Web service workflow without any changes to the parts finished. The objective is to automatically generate different business process according to the user requirements, hence to provide satisfactory customized services by organizing various Web services accordingly. Based on Smartflow applications, this article propose a method for Web services workflow rebuilding, considering a variety of factors for services failures. Use a dynamic Web services composition algorithm, build a domain ontology to increase the semantic function. Achieve the implementation of Web services workflow continuity and stability.This article's major contributions are as follows:1. Analysis of user and environmental factors leading to service failure, and propose a method for workflow rebuilding. In this method, we only rebuild the necessary part of the workflow without any changes to the parts finisher.2. Propose service composition mechanism models services as directed attributed graphs, maintains a repository of service graphs, and dynamically combines multiple basic services into complex services.3. Construction of a domain ontology, and calculation of similarity between services to provide a description of semantic for Web services selection.As a research on Web service workflow security based on a intelligent tourism platform, this article has considered many situations which may have impacts on workflow course, built a domain ontology , used a dynamic combination algorithm of Web services and a workflow reconstruction algorithm. It is very significant for users.