A UNITY-Based Framework Towards Component Based Systems

Abstract

The paper offers a UNITY-based framework to model distributed applications which are built with a component based approach. The framework enables components to be abstractly specified in terms of contracts. Temporal properties are expressed and proven in the UNITY style. Compositional reasoning about components' properties, including progress, is supported. The semantical model is simple and intuitive.

Web Cube

“…Let B be an environment for P . We write: The result from [18] below states that progress 'driven by x' is preserved by weak refinement over B:…”

“…Udink's [26] and Vos' [27], that preserve progress; but these are expensive to verify. For Web Cube, we choose a weak notion of refinement, taken from our previous work [18]. It is even weaker than simple reduction of non-determinism, and thus has the advantage that it is less restrictive, and hence easier to verify.…”

“…Black box reasoning is however also fundamentally difficult, because parallel composition typically destroys progress properties of a component. Web Cube uses the theory from [18,19] to get a reasonably powerful black box logic while remaining light weight.…”

“…Contribution. Web Cube proposes a formal programming model for web applications with a Seuss logic support and the black box enhancement from our previous work [18,19]. With respect to Seuss we contribute an extension, namely the notions of web application and service.…”

“…With respect to Seuss we contribute an extension, namely the notions of web application and service. With respect to [18,19] the novelty here is in showing its application in the domain of web programming.…”