Abstract
We present an approach to the specification of required external non-determinism: the willingness of a component to respond to a number of external action requests, using a language, COMMUNITY, which provides both permission and willingness guards on actions.
This enables a program-like declaration of required non-determinism, in contrast to the use of a branching-time temporal logic. We give a definition of parallel composition for this language, and show that refinement is compositional with respect to parallel composition. We use the concepts developed for COMMUNITY to identify extensions to the B and VDM++ model-based specification languages to incorporate specification of required non-determinism. In particular, we show that preconditions may be considered as a form of willingness guard, separating concerns of acceptance and termination, once module contracts are re-interpreted in a way suitable for a concurrent environment.
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© 1997 Springer-Verlag Berlin Heidelberg
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Lano, K., Bicarregui, J., Fiadeiro, J., Lopes, A. (1997). Specification of required non-determinism. In: Fitzgerald, J., Jones, C.B., Lucas, P. (eds) FME '97: Industrial Applications and Strengthened Foundations of Formal Methods. FME 1997. Lecture Notes in Computer Science, vol 1313. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-63533-5_16
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DOI: https://doi.org/10.1007/3-540-63533-5_16
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