Research on Web Service Dynamic Composition Based on Execution Dependency Relationship

Web service composition is to assemble single services, and it can realize the function that cannot be completed by the single services. How to composite services according to user's requests quickly and accurately is a key problem to be solved in the era of service-oriented software engineering (SOSE). On the basis of storing service information, we get execution dependency relations among services in the consideration of service interface (Input and Output) and capability (Precondition and Effect) firstly. Then the join operation in relational database (RDB) is used to determine the service composition path quickly according to user's requests. The semantic reasoning relationship between concepts and the concept status path are used to do the calculation, and it helps to enhance the accuracy of service composition. The effectiveness of the proposed method is validated through experiments.