A Dynamic Service Composition Architecture in Supporting Reliable Web Service Selection

Service-Oriented Architecture (SOA) is intended for the integration of heterogeneous applications. Complex business processes can be composed by a group of concrete Web services using WS-BPEL (Business Process Execution Language), and these Web services may be designed by the enterprise itself or provided by some third-party services providers. Today there are many WS-BPEL engines available that support the deployment and execution of WS-BPEL processes. However, WS-BPEL activities have to be pre-defined, and if at runtime a Web service invocation fails, the entire process is pronounced to be failed, thereby jeopardizing the reliability of SOA. Although WS-BPEL supports compensation and fault-handling mechanism, it is complex and not flexible. In this work, we propose a process design model to support dynamic Web services selection that eases the designer´s job. This model has been implemented, and the prototype is evaluated to demonstrate that it indeed improves the overall business process reliability.