Research On Web Service Exception Handling Technology Of CA-CCML Language

Recently,the development of Web service and service composition is in the ascendant.With the difficulty of single Web services to meet the increasingly complex business needs,Web service composition is gaining more and more attention.To describe business process of Web service composition,many Web service composition languages are created.Research group proposes Context-Aware Cooperative Composition Modeling Language(CA-CCML),which can describe the static Web service composition and take into account the dynamic interaction between Web services at the same time.Meanwhile,CA-CCML combines context aware technology to traditional Web service composition,making it meet user's personalized requirements.However,there are various exceptions during the execution of Web service composition,which leads to the failure of Web service composition execution.To ensure Web service composition executing normally,it is of great practical significance to study the Web service composition exception handling technology in CA-CCML language.In this paper,based on the research of related research results,and combined with the characteristics of CA-CCML,exception handling technology of Web service based on CA-CCML is studied deeply,and the Web service composition exception handling framework of CA-CCML language is given.In this framework,two modules respectively exception capturing module and exception repairing module are focused on.For exception capturing,exception classification is given.And then CA-CCML exception capturing model based on Hidden Markov Model(CCEC-H)is proposed.With the help of concepts of system traits,this model is used to monitor composition system in real time,judge the current state of composition system and capture the exception of the system in time.After that,using a variety of exception repairing policies including retry,replace,compensate,rollback,terminate and manually handle,given exception repairing logic and default exception repairing logic,captured exception is repaired.Finally,a practical application case is given to verify the practicability and effectiveness of the Web service composition exception handling technology in CA-CCML language.