Using Assertions to Enhance the Correctness of Kmelia Components and their Assemblies

15 p.International audienceThe Kmelia component model is an abstract formal component model based on services. It is dedicated to the specification and development of correct components. This work enriches the Kmelia language to allow the description of data, expressions and assertions when specifying components and services. The objective is to enable the use of assertions in \kmelia in order to support expressive service descriptions, to support client/supplier contracts with pre/post-conditions, and to enhance formal analysis of component-based system. Assertions are used to perfom analysis of services, component assemblies and service compositions. We illustrate the work with the verification of consistency properties involving data at component and assembly levels

Using Event-B to Verify the Kmelia Components and Their Assemblies

International audienceBuilding reliable software systems from components requires to verify the consistency of components and the correctness of component assemblies. In this work, we design a verification method to address the problem of verifying the consistency of components states and the correctness of assembly contracts, using pre-/post-conditions. The starting point is specifications written with the Kmelia component model: a Kmelia component type declares provided and required services which are used to link components in component assemblies. We generate Event-B models from Kmelia specifications in such a way that we can check the consistency and also the correctness of assembly at the Kmelia level, using Event-B provers. An illustrative example based on a stock management system is used to support the presentation

Combining Techniques to Verify Service-based Components

International audienceEarly verification is essential in model-driven development because late error detection involves a costly correction and approval process. Modelling real life systems covers three aspects of a system (structure, dynamics and functions) and one verification technique is not sufficient to check the properties related to these aspects. Considering Service-based Component Models, we propose a unifying schema called multi-level contracts that enables a combination of verification techniques (model checking, theorem proving and model testing) to cover the V&V requirements. This proposal is illustrated using the Kmelia language and its COSTO tool

Formal aspects of component software

This is the pre-proceedings of 6th International Workshop on Formal Aspects of Component Software (FACS'09)

Assistance au test de modèles à composants et services

ISBN 978-2-905267-89-4International audienceDans l'ingénierie des modèles, la correction des modèles est essentielle. Tester le plus tôt possible permet de réduire le coût du processus de véri cation et de validation. Distinguer modèle abstrait et modèle spéci fique réduit la complexité du test et favorise l'évolution du système modélisé. Nous ciblons les modèles à composants et services, ayant un niveau de description su ffisamment précis et détaillé pour pouvoir exécuter les tests. Notre objectif est de tester ces modèles à composants c'est-à-dire de concevoir des cas de tests, de les appliquer sur les modèles mis dans un contexte adéquat pour être exécutés et obtenir un verdict. Pour réduire l'eff ort de construction du harnais de test, nous proposons une méthode qui guide le testeur dans le processus de conception des tests au niveau du modèle. L'assistance à la construction est basée sur (1) la détection d'incohérences et d'incomplétude entre le harnais et le modèle de test ainsi que sur (2) des propositions générant les éléments manquants. Le programme de test est alors transformé vers une plateforme technique dédiée à l'exécution des tests. La mise en oeuvre est réalisée avec des plugins Eclipse dans COSTO, une plateforme dédiée au modèle à composants Kmelia

Mapping Component Models on Distributed Architectures: Correctness Checking

Abstract-We propose a method to check if a distribution of components, proposed to implement a given assembly of components, is correct with respect to the targeted host distributed architecture. The method is based on the principle of checking that the accessibility relation induced by the proposed distribution of components, is consistent with the accessibility relation imposed by the designed component model. The benefit is twofold: either to refine the designed component model or to adapt the envisioned deployment. The study is illustrated with examples of component models. The Event-B framework is used to check correctness, and we have developed a simulation prototype tool to support experimentations. keywords: Abstract Component Model, Distributed Architecture, Verification, Deployment, Event-