Mastering Heterogeneous Behavioural Models

Heterogeneity is one important feature of complex systems, leading to the complexity of their construction and analysis. Moving the heterogeneity at model level helps in mastering the difficulty of composing heterogeneous models which constitute a large system. We propose a method made of an algebra and structure morphisms to deal with the interaction of behavioural models, provided that they are compatible. We prove that heterogeneous models can interact in a safe way, and therefore complex heterogeneous systems can be built and analysed incrementally. The Uppaal tool is targeted for experimentations.Comment: 16 pages, a short version to appear in MEDI'201

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-

Multi-Facets Contract for Modeling and Verifying Heterogeneous Systems

Critical and cyber-physical systems (CPS) that exist in large industries, such as nuclear power plants, railway, automotive or aeronautical industries are complex heterogeneous systems. They are complex because they are open, perimeter-less, often built by assembling various heterogeneous and interacting components which are frequently reconfigured due to requirements. Consequently, the modeling and analysis of such systems is a challenge in software engineering. We introduce a new method for modeling and verifying heterogeneous systems. The method consists in: equipping individual components with generalized contract, ordering these contracts according to given facets, composing these components and verifying the resulting system with respect to the facets. We illustrate the use of the method by a case study. The proposed method may be extended to cover more facets, and by strengthening assistance tool through proactive aspects in modelling and property verification

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

Test Cases Evolution of Mobile Applications: Model Driven Approach

AELOS_HCERES2020 , NAOMOD_HCERES2020Mobile Applications Developers, with large freedom given to them, focus on satisfying market requirements and on pleasing consumer’s desires. They are forced to be creative and productive in a short period of time. As a result, billions of powerful mobile applications are displayed every day. Therefore, every mobile application needs to continually change and make an incremental evolution in order to survive and preserve its ranking among the top applications in the market. Mobile apps Testers hold a heavy responsibility on their shoulders, the intrinsic nature of agile swift change of mobile apps pushes them to be meticulous, to be aware that things can be different at any time, and to be prepared for unpredicted crashes. Therefore, starting the generation or the creation of test cases from scratch and selecting each time the overridden or the overloaded test cases is a tedious operation. In software testing the time allocated for testing and correcting defects is important for every software development (regularly half the time). This time can be reduced by the introduction of tools and the adoption of new testing methods. In the field of mobile development, new concerns should be taken into account; among the most important ones are the heterogeneity of execution environments and the fragmentation of terminals which have different impacts on the functionality, performance, and connectivity. This project studies the evolution of mobile applications and its impact on the evolution of test cases from their creation until their expiration stage. A detailed case study of a native open source Android application is provided; describing many aspects of design, development, testing in addition to the analysis of the process of mobile apps evolution. This project based on model driven engineering approach where the models are serialized using the standard XMI. It presents a protocol for the adaptation of test cases under certain restrictions

A Service-Based Component Model: Formalism, Analysis and Mechanization

Component-Based Software Engineering (CBSE) is one of the approaches to master the development of large scale software. In this setting, the verification concern is still a challenge. The objective of our work is to provide the designer of components-based systems with the methods to assist his/her use of the components. In particular, the current work adresses the composability of components and their services. A component model is presented, based on services. An associated simple but expressive formalism is introduced; it describes the services as extended LTS and their structuring as components. The composition of components is mainly based on service composition and encapsulation. The composability of component is defined from the composability of services. To ensure the correctness of component composition, we check that an assembly is possible via the checking of the composabiblity of the linked services, and their behavioral compatibility. In order to mechanize our approach, the services and the components are translated into the MEC and LOTOS formalism. Finally the MEC and LOTOS CADP toolbox is used to perform experiments

Protocoles d'utilisation de composants : spécification et analyse en Kmelia

National audienceL'approche des composants logiciels constitue une solution pour développer des logiciels de façon modulaire et en (ré)utilisant l'existant. Cependant, ce n'est pas facile de trouver des composants appropriés à  un besoin spécifique et pouvoir se servir convenablement des services offerts. Nous proposons de répondre à la fois à la problématique de la description de "mode d'emploi" pour les composants et à celle de l'expression de contraintes d'utilisation par la spécification de multiples modes d'emploi qui peuvent être utilisés comme des services quelconques. Pour s'assurer que les protocoles sont exempts d'anomalies, nous avons élaboré une technique d'analyse de leur cohérence. Notre étude et les expérimentations sont faites sur la base du modèle à composants Kmelia