Extending the Common Variability Language (CVL) Engine

Abstract

The Common Variability Language (CVL) has become a reference in the speci cation and resolution of variability in the last few years. Despite the multiple advantages of CVL (orthogonal variability, architecture variability resolution, MOF-compliant, standard proposed,. . . ), several approaches require extending and/or modifying the CVL approach in di erent ways in order to ful ll the industrial needs for variability modeling in Software Product Lines. However, the community lacks a tool that would enable proposed extensions and the integration of novel approaches to be put into practice. Existing tools that provide support for CVL are incomplete or are mainly focused on the variability model's editor, instead of executing the resolution of the variability over the base models. Moreover, there is no API that allows direct interaction with the CVL engine to extend or use it in an independent application. In this paper, we identify the extension points of the CVL approach with the goal of making the CVL engine more exible, and to help software architects in the task of resolving the variability of their products. The practical tool presented here is a working implementation of the CVL engine, that can be extended through a proposed API.

Integrating the common variability language with multilanguage annotations for web engineering

“…. ) automatically generated when the variability is resolved (#e a ) and the [24], and Enxenio tool [15] AL At the architectural level. number of elements manually defined (#e m ) in order to manually resolve the variability of a specific product:…”

“…Combined approaches have not a dedicated tool and the developer usually needs one or more tools to support both compositional and annotative approaches. Our approach is supported by the vEXgine tool [24] and the SPL Web Engine of Enxenio [15] that work in conjunction as explained in Section 4. Table 2 summarizes and compares the results of our approach with pure composition-based and pure annotation-based approaches and with the two more well-known integration approaches of Kästner and Apel [28] and FeatureCoPP [35].…”

“…We propose to extend the CVL approach to allow specifying not only coarse-grained variability, but fine-grained variability that can be resolved with annotations. To bring the CVL approach in practice we use vEXgine [24], a customizable and extensible implementation of the CVL execution engine that fully supports the derivation process, including a delegation mechanism that can be extended with different delegation engines. In particular, for this paper, we extend vEXgine to delegate the variability resolution process in a scaffolding-based derivation engine adapted from [15] to support the separation of the source code into different components, being each of them composed itself by a set of artifacts.…”

Context‐dependent reconfiguration of autonomous vehicles in mixed traffic

“…The variation points model the possible adaptations that the software architecture supports. Specifically, each variation point (dashed line) defines a transformation (eg, object existence, object substitution, and parameter assignment) in the software architecture that will be executed by the CVL engine when a particular configuration is selected in the variability model, adapting the components of the autonomous vehicle. () For example, when the context changes because the vehicle joins a motorway, a new configuration is generated: The new context is selected in the tree, and the IDM model is automatically selected in the configuration due to the cross‐tree constraints defined in OCL.…”

Automatic Evolution of Eco-Efficient Software Architectures with CVL Models

“…• Se define un proceso para evolucionar una línea de productos arquitectónica (PLA, del inglés Product Line Architecture) [2]. • Se modela la configuración de cada tenant como una característica clonable usando modelos de variabilidad con cardinalidad en CVL [10]. • Se formalizan los modelos de configuración y puntos de variación del lenguaje CVL.…”