High-level Language Support for the Control of Reconfiguration in Component-based Architectures
Résumé
Architecting in the context of variability has become a real need in nowadays
software development. Modern software systems and their architecture must adapt
dynamically to events coming from the environment (e.g., workload requested by
users, changes in functionality) and the execution platform (e.g., resources
availability).
Component-based architectures have shown to be very suited for self-adaptation
purposes, not only because of their intrinsic characteristics like reusability
and modularity, but also as virtue of their dynamical reconfiguration capabilities.
The issue, nevertheless, remains that adaptation
behaviors are generally conceived by means of fine-grained reconfiguration
actions from the very initial configurations. This way, besides the complexity
in managing large-sized architectures, the space of reachable configurations is
not know in advance, which prevents ensuring well-mastered adaptive behaviours.
This paper presents Ctrl-F, a domain-specific language whose objective
is to provide high-level support for describing adaptation behaviours and
policies in component-based architectures. The proposed language lies on
synchronous reactive programming, which means that it benefits of an
entire environment and formal tooling allowing for the verification and
control of reconfigurations. We show the applicability of Ctrl-F by first
integrating it to FraSCAti, a Service Component Architecture middleware platform,
and then by applying it to Znn.com, a well known self-adaptive case study.
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