From Local Impact Functions to Global Adaptation of Service Compositions
SSS '09 Proceedings of the 11th International Symposium on Stabilization, Safety, and Security of Distributed Systems
A feedback-based decentralised coordination model for distributed open real-time systems
Journal of Systems and Software
CLiSuite: simplifying the development of cross-layer adaptive applications
Proceedings of the 7th Workshop on Middleware for Next Generation Internet Computing
Improving context interpretation by using fuzzy policies: the case of adaptive video streaming
Proceedings of the 28th Annual ACM Symposium on Applied Computing
Using fuzzy policies to improve context interpretation in adaptive systems
ACM SIGAPP Applied Computing Review
Self-Assessment and Reconfiguration Methods for Autonomous Cloud-based Network Systems
DS-RT '13 Proceedings of the 2013 IEEE/ACM 17th International Symposium on Distributed Simulation and Real Time Applications
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The ability of networked system software to adapt in a controlled manner to changes in the environment and requirements is crucial, but difficult to realize in complex systems with multiple interacting software layers/components. Typically, many components in a networked system implement adaptive behaviors and encapsulate their own adaptation logic (policies), making the whole system's adaptive behavior hard to analyze, coordinate, and test. This paper describes Cholla, a software architecture that separates the policy decisions of how and when adaptive components in networked systems react to their environment into separate centralized controllers that are constructed from composable rule sets. Centralizing policy decisions into controllers in Cholla facilitates the analysis, coordination, and testing of these policies, while the composable nature of these controllers allows them to be customized to changing user, application, and hardware demands. In addition to describing the architecture of Cholla, this paper also presents a Linux-based prototype implementation of this architecture that controls and coordinates adaptation policy decisions inside network protocols and multimedia applications. An experimental evaluation of this prototype demonstrates that Cholla's controller architecture enables component-based construction and customization of adaptation policies in networked systems, and that these policies can effectively control and coordinate adaptation.