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Runtime Reflection: An approach for the model-based runtime analysis of distributed reactive systems

Andreas Bauer Technische Universitat-Munich 4pm Monday 5th June 2006 Room 2511, JCMB, King's Buildings

Distributed reactive systems have pervaded everyday life and objects, but often lack measures to ensure adequate behaviour in the presence of unforeseen events or even errors at runtime. As interactions and dependencies within distributed systems increase, the problem of detecting failures which depend on the exact situation and environment conditions they occur in grows. As a result, not only the detection of failures is increasingly difficult, but also the differentiation between the symptoms of a fault, and the actual fault itself, i.e., the cause of a problem.

In this talk, a novel and efficient approach for analysing reactive distributed systems at runtime is presented, in that a framework for detecting failures as well as identifying their causes is introduced. The approach is based upon monitoring safety-properties, specified in the linear time temporal logic LTL (respectively, TLTL) to automatically generate monitor components which detect violations of these properties. Based on the results of the monitors, a dedicated diagnosis is then performed in order to identify explanations for the misbehaviour of a system. These may be used to store detailed log files, or to trigger recovery measures. The framework is built modular, layered, and uses merely a minimal communication overhead - especially when compared to other, similar approaches known from the literature. Further, first experimental results from an implementation are sketched, and how it can be used to build a variety of distributed reactive systems using these techniques.

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