مشخصات پژوهش

As the use of web services is growing, there is an increasing demand for dependability of these services in business-critical applications. In this paper we introduce various proposals for dependable web services. The existing solutions are divided into two categories: fault tolerance techniques, such as active and passive replications, and the use of design diversity. The main contribution of this paper is the use of design diversity techniques and web services business process execution language (WS-BPEL), which would result in proposing a useful and flexible architecture for dependable web services. The proposed architecture has been used as the basis of the proposed design pattern for dependable web services, called D3WS. We have implemented the proposed architecture in a prototype application using N-version programming (NVP) and N-self-checking programming (NSCP) techniques. We have also modeled the architecture using stochastic reward nets (SRNs) for further evaluation of dependability measures. The proposed architecture, prototype implementation, the SRN model and the results of its evaluation are presented in this paper.