François Taïani, Jean-Charles Fabre, and Marc-Olivier Killijian

Principles of Multi-Level Reflection for Fault Tolerant Architectures

Proceedings of the 2002 Pacific Rim International Symposium on Dependable Computing (PRDC'02), Tsukuba (Japan), 16-18 December, pp. 59-66, ISBN 0-7695-1852-4, IEEE Computer Society, 2002 (8p.)

This paper presents the principles of multilevel reflection as an enabling technology for the design and implementation of adaptive fault tolerant system architectures. The reflection paradigm enables exhibiting the structural and behavioral aspects of the software component under control, to design and implement appropriate non-functional mechanisms at a metalevel. This paradigm provides separation of concern, which is highly needed as far as fault tolerance is concerned. However, the design and the implementation of fault tolerance being an orthogonal concept among system layers, this paradigm must be applied to all system layer in a consistent manner to provide the necessary and sufficient information for error detection and recovery. This is the main argument for introducing the notion of multilevel reflection in this paper, and describing its basic concepts and overall framework. Examples related to fault tolerant computing are used to justify the concepts. Some practical work based on retro-engineering techniques has recently been carried out to start implementing the proposed framework.

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