WiDiSi: A Wi-Fi direct simulator

This paper describes WiDiSi, a research-oriented prototype simulator for Wi-Fi Direct networks. WiDiSi is provided as an extension of PeerSim, a widely-used, open-source simulation framework for large-scale peer to peer networks. WiDiSi's main goal is to allow Android Wi-Fi direct applications to be easily tested in large-scale dynamic scenarios. In this article, we explain how WiDiSi was modeled and present its general architecture. We also provide evaluation results that show the correctness and the capabilities of the simulator

Towards a unified framework for the monitoring and recovery of BPEL processes

Web services have proven to be a viable solution for inter-operability issues. Since end users do not buy services, but only interact with them remotely, such complex systems end up having a distributed ownership, meaning different parts of a system can evolve independently. This has brought researchers to concentrate on run-time management issues such as dynamic monitoring and self-recovery. However, we advocate that no silver bullet has been found. All the major approaches have advantages and disadvan-tages. In this paper we propose a unified framework for monitoring and recovery that provides a clear separation be-tween data collection and analysis, a common management infrastructure, and a common recovery system. Separating monitoring from recovery allows the framework to integrate different monitoring approaches seamlessly through a plug-in approach. The common management infrastructure al-lows us to dynamically manage the multiple monitoring ap-proaches being used, while the common recovery approach allows us to activate advanced recovery techniques both on process instances and process definitions