Formal Methods for Protocol Testing: A Detailed Study
IEEE Transactions on Software Engineering
Observer-A Concept for Formal On-Line Validation of Distributed Systems
IEEE Transactions on Software Engineering
A real-time software supervision approach for automatic failure detection
A real-time software supervision approach for automatic failure detection
Assume-Guarantee Supervisor for Concurrent Systems
IPDPS '01 Proceedings of the 15th International Parallel & Distributed Processing Symposium
Assume-Guarantee Algorithms for Automatic Detection of Software Failures
IFM '02 Proceedings of the Third International Conference on Integrated Formal Methods
Detection of Response Time Failures of Real-Time Software
ISSRE '97 Proceedings of the Eighth International Symposium on Software Reliability Engineering
Hierarchical Supervisors For Automatic Detection Of Software Failures
ISSRE '97 Proceedings of the Eighth International Symposium on Software Reliability Engineering
| Hi-index | 0.01 |
Failures of a software system are detected by a supervisor, a separate unit which observes the inputs and outputs of the system and reports its failures in real-time. The supervisor determines whether a failure has occurred by comparing the observed and the specified behavior. The specification of behavior is assumed to be expressed in a formalism based on communicating extended finite state machines (specifically, ITU-T SDL). The supervisor must tolerate legal behavioral alternatives resulting from nondeterminisms in the specification. The computational costs of considering such alternatives can be fairly high. The paper presents the Conditional-Belief (CB) theory that reduces the cost of consideration of alternatives by using conditional-beliefs to represent sets of legal behavioral alternatives. The paper reviews belief-based supervision, introduces the CB theory, and outlines an algorithm for conversion of a class of SDL specification to a CB supervisor model. It describes a demonstration system developed to evaluate CB supervision, and summarizes failure detection and computational cost results for the supervisor of the control program of a small telephone exchange.