Research on the dynamic reconfiguration of Web application using two-phase compatibility verification

Abstract

Implemented by dynamic service composition and integration, Web application has significantly affected our daily life, such as e-commerce and e-government. However, the open and ever-changing environment makes Web users more vulnerable to the usability problem, i.e. unreachable pages and reduced responsiveness. Accordingly, there is a need to deliver reliable Web application with attributes that cover the correctness and reliability. For the efficient handling of failures, the compatibility verification of dynamic reconfiguration strategies is attached great importance since it can guarantee the robustness and high quality of Web-based software. This paper extends the classical finite state machine (FSM) to formalize the behaviour of Web application, namely the extended FSM for Web applications (EFSM4WA) model. This model is also suitable to formally describe the interaction behaviours of dynamic reconfiguration when Web application encountered failure. Then, the compatibility verification of dynamic reconfiguration is carried out in two phases. During the first phase, it adopts the trace projection approach to check the compatibility against the synchronized product model in a qualitative way, which will select a set of candidate Web applications. During the second phase, it takes performance into consideration to choose a high-reliability Web application in a quantitative way. Finally, a case study is demonstrated to show the applicability of our approach.