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This paper revisits a problem that was identified by Kramer and Magee: placing a system in a consistent state before and after runtime changes. We show that their notion of quiescence as a necessary and sufficient condition for safe runtime changes is too strict and results in a significant disruption in the application being updated. In this paper, we introduce a weaker condition: tranquility. We show that tranquility is easier to obtain and less disruptive for the running application but still a sufficient condition to ensure application consistency. We present an implementation of our approach on a component middleware platform and experimentally verify the validity and practical applicability of our approach using data retrieved from a case study.
Distributed objects, Componentware, Application-aware adaptation, Distributed objects, components, containers
Peter Ebraert, Yves Vandewoude, Theo D'Hondt, Yolande Berbers, "Tranquility: A Low Disruptive Alternative to Quiescence for Ensuring Safe Dynamic Updates", IEEE Transactions on Software Engineering, vol. 33, no. , pp. 856-868, December 2007, doi:10.1109/TSE.2007.70733
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