Reflection has been used with some success, since quite a few years now, for dealing with separation of concerns and transparency of fault-tolerance mechanisms for the application. Nevertheless, it has also shown some concerning the control of fine-grain information such as thread control or other deep aspects of the platform. We propose here the use of a new concept, called multi-level reflection, for firstly solving these issues, but also for introducing more adaptation into fault-tolerant reflective architectures. We also discuss some essential validation issues of reflective systems, which are still a challenge for future research.
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