Composable Controllers in Fractal: Implementation and Interference Analysis

Abstract

Fractal component model provides controllers for adding extra-functional capabilities to component behaviors. However, controllers may interfere one with another and their composition is still a challenge. In this article, we extend Fractal with a support for composing controllers with reusable operators. Then, we discuss how to formally model and analyze, in Uppaal, Fractal systems with several controllers. This enables us to detect when controllers interfere and to check whether their composition is interference-free.