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Algorithmic Computation of Strongest Postconditions of Services as Priced Timed Automata


Publication Type:

Report - MRTC




Service-Oriented Systems (SOS) have gained importance in different application domains thanks to their ability to enable reusable functionality provided via well-defined interfaces, and the increased opportunities to compose existing units, called services, into various configurations. Developing applications in such a setup, by reusing existing services, brings some concerns regarding the assurance of the expected Quality-of-Service (QoS), and correctness of the employed services. In this paper, we provide a formal mechanism of computing service guarantees, automatically. We assume service models annotated with pre- and postconditions, their semantics given as Priced Timed Automata (PTA), and the forward analysis method for checking the service correctness w.r.t. given requirements. Under these assumptions, we show how to compute the strongest postcondition of the corresponding automata algorithmically, with respect to the specified precondition. The approach is illustrated on a small example of a service modeled as Priced Timed Automaton (PTAn).


author = {Aida Causevic and Cristina Seceleanu and Paul Pettersson},
title = {Algorithmic Computation of Strongest Postconditions of Services as Priced Timed Automata},
number = {ISSN 1404-3041 ISRN MDH-MRTC-263/2012-1-SE},
month = {April},
year = {2012},
url = {}