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Issue No. 06 - November/December (2007 vol. 24)
ISSN: 0740-7459
pp: 39-46
Danilo Ardagna , Politecnico di Milano
Marco Comuzzi , Politecnico di Milano
Enrico Mussi , Politecnico di Milano
Barbara Pernici , Politecnico di Milano
Pierluigi Plebani , Politecnico di Milano
The PAWS (Processes with Adaptive Web Services) framework facilitates flexible and adaptive execution of managed Web-service-based business processes. The framework coherently integrates several service-adaptation modules and uniquely couples design-time and runtime mechanisms for process specification and global framework execution. During design, PAWS achieves flexibility through a number of mechanisms: it identifies a set candidate services for each process task, negotiates QoS, specifies quality constraints, and then identifies mapping rules for invoking services with different interfaces. At runtime, PAWS exploits the design-time mechanisms to support adaptation during process execution: it selects the best set of services to execute the process, reacts to service failures, and preserves execution when a context change occurs. PAWS has been applied in several case studies in various domains; results show that it can reduce design-time efforts to create a flexible process, while ensuring a good trade-off between user and provider requirements. This article is part of a special issue on service-centric software systems.
adaptive software, autonomic computing, quality of service (QoS), systems engineering, Web services

B. Pernici, E. Mussi, P. Plebani, D. Ardagna and M. Comuzzi, "PAWS: A Framework for Executing Adaptive Web-Service Processes," in IEEE Software, vol. 24, no. , pp. 39-46, 2007.
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