Abstract
Self-adaptive systems are systems that automatically adapt in response to environmental and internal changes, such as possible failures and variations in resource availability. Such systems are often realized by a MAPE-K feedback loop, where Monitor, Analyze, Plan and Execute components have access to a runtime model of the system and environment which is kept in the Knowledge component. In order to provide guarantees on the correctness of a self-adaptive system at runtime, the MAPE-K feedback loop needs to be extended with assurance techniques. To address this issue, we propose a coordinated actor-based approach to build a reusable and scalable model@runtime for self-adaptive systems in the domain of track-based traffic control systems. We demonstrate the approach by implementing an automated Air Traffic Control system (ATC) using Ptolemy tool. We compare different adaptation policies on the ATC model based on performance metrics and analyze combination of policies in different configurations of the model. We enriched our framework with runtime performance analysis such that for any unexpected change, subsequent behavior of the model is predicted and results are used for adaptation at the change-point. Moreover, the developed framework enables checking safety properties at runtime.
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- 1.
This system is studied in collaboration with Isavia, the air traffic control company in Iceland (http://www.isavia.is).
- 2.
The source code which is used for these experiments is uploaded in http://rebeca.cs.ru.is/files/ATC.zip.
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Acknowledgment
The work on this paper has been supported in part by the project “Self-Adaptive Actors: SEADA” (nr. 163205-051) of the Icelandic Research Fund.
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Bagheri, M. et al. (2017). Coordinated Actors for Reliable Self-adaptive Systems. In: Kouchnarenko, O., Khosravi, R. (eds) Formal Aspects of Component Software. FACS 2016. Lecture Notes in Computer Science(), vol 10231. Springer, Cham. https://doi.org/10.1007/978-3-319-57666-4_15
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