Market-­‐awareness	  in	  Service-­‐based	  Systems	                                        Romina Torres, Hernan Astudill...
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Market awareness in Service based Systems


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Poster by Romina Torres, Hernan Astudillo and Nelly Bencomo at the 2nd Awareness Workshop on Challenges for Achieving Self-awareness in Autonomic Systems @ SASO 2012, Lyon, France

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Market awareness in Service based Systems

  1. 1. Market-­‐awareness  in  Service-­‐based  Systems   Romina Torres, Hernan Astudillo Nelly Bencomo Universidad Técnica Federico Santa María, Chile INRIA Paris - Rocquencourt, France {romina, hernan} Abstract   In  ac9on   Service providers and consumers exist in a  service market that is constantly At design time changing. While service providers continuously improve their quality of services (QoS), service consumers can update their specifications according to what the R market is offering. In this work, we propose a framework to enable online awareness Send email with the location of of changes in the service market to both, consumers and providers, by representing user as fast as possible them as active software agents. Our approach dictates that abstract specifications of the QoS are defined during design time. At runtime, consumer agents concretize QoS specifications according to the available market knowledge. Services agents are L(KT) collectively aware of themselves and of the consumers’ requests. Moreover, these response time = agents can create and maintain virtual organizations that create or maintain aligned {fast, average, slow} the architecture of service-based systems with the market.  2   Problem   S* S* S , K R Service of category {send, Service of category {send, email} with at least a fast Service of category What does it mean fast Send emails from the email} with at least a fast response time 12100 with at least a in services capable to application as fast as response time response time less than send email? possible 1 10 milliseconds 3 2 1 3 At runtime is valid only if K has not changed considerably since the specification S was defined KT+z KT+y To maintain R satisfied: KT+x KT+w KT+v KT+v KT 2+3   … At runtime KT+zProviders:-  are under an inherent competition with functionally-equivalent providers-  are passive entities waiting to be discovered-  are missing business opportunities 4Consumers: periodically  -  QoS specifications depend on what the market is currently offering- Are too busy: trying to understand the market, searching candidates, composing Contracts between consumers and providers are subscribed to the monitoring process ofsolutions, verifying their compliance and determining the needed adaptations the adaptation recommender system (Adaptive). Time to time Adaptive monitors the contracts, analyze them (in order to determine if the Proposal contracts have been violated recurrently) and ask to the market a new configuration if an adaptation is needed. We propose to make service consumers and providers market-aware in order to The service market is also monitored. If there is enough evidence the market has achieve automatic adaptive maintenance of service-based systems. changed, then a new knowledge domain is generated and then all contracts are remapped into concrete specifications. CONCLUSIONS   Service providers are collectively aware of the current demands of the market, other competitors and even potential partners to provide services as virtual organizations. Service consumers are continuously aware of the adaptations needed to automatically perform adaptive maintenance. without MACOCO Related  Publica9ons   [1]- Requirements-Aware Systems A research agenda for RE for self-adaptive systems, Pete Sawyer, Nelly Bencomo, Jon Whittle, Emmanuel Letier, Anthony Finkelstein, International Requirements Engineering Conference, RE 2010, Sydney, Australia, September, 2010 [2]- Web service compositions which emerge from virtual organizations with fair agreements (best student paper), Romina Torres, Denise Rivera, Hernan Astudillo, KES Agent and Multi-Agent Systems. Technologies and Applications. Dubrovnik, Croatia, June 2012. [3]- Toward open-world software: Issue and challenges, Luciano Baresi, Elizabeth Di Nitto, and Carlo Ghezzi. Computer, vol. 39, no. 10, pp. 36–43, Oct. 2006.. [4]- Mitigating the obsolescence of quality-specification models in service-based systems, Romina Torres, Nelly Bencomo, Hernan Astudillo, in Model-Driven Requirements Engineering Workshop (MoDRE), sept. 2012. with MACOCO [5]- From virtual organizations to self-organizing web service compositions, Romina Torres, Denise Rivera, and Hernan Astudillo, in Proceedings of the XXIX International Conference of the Chilean Computer Science Society, ser. SCCC ’11. IEEE Computer Society, 2011. [6]- Four dark corners of requirements engineering, Pamela Zave and Michael Jackson ACM Trans. Softw. Eng. Methodol., vol. 6, no. 1, pp. 1–30, Jan. 1997.Market-awareness = MACOCO + Language to mitigate the obsolescence of the qualityspecifications- Consumers and providers are represented as active software agents who negotiate on Acknowledgements  their behalf. They have a common environment represented by the Blackboard. This work was partially funded by FONDEF (grant D09i1171), UTFSM DGIP 241167, BASAL- Consumers avoid the obsolescence of their specifications by expressing their requirements FB0821(FB.02PG.11), the EU Marie Curie Project Requirements@runtime and the EUusing abstract specifications. These abstract specifications are concretized at runtime. Connect project.