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Modern component frameworks support continuous deployment and simultaneous execution of multiple software components on top of the same virtual machine. However, isolation between the various components is limited. A faulty version of any one of the software components can compromise the whole system by consuming all available resources. In this paper, we address the problem of efficiently identifying...
Coordinating the configurations of Services, Orchestrations, Execution Platform and Infrastructure layers in a Service-Based environment is a significant challenge for software industry. In recent years, it has become even more difficult, because infrastructure solutions such as AmazonEC2, Cloudstack or RackSpace have increasingly rich capabilities, allowing for example, the infrastructure/platform/application...
The increasing need for continuously available software systems has raised two key-issues: self-adaptation and design evolution. The former one requires software systems to monitor their execution platform and automatically adapt their configuration and/or architecture to adjust their quality of service (optimization, fault-handling). The later one requires new design decisions to be reflected on...
Since software systems need to be continuously available under varying conditions, their ability to evolve at runtime is increasingly seen as one key issue. Modern programming frameworks already provide support for dynamic adaptations. However the high-variability of features in Dynamic Adaptive Systems (DAS) introduces an explosion of possible runtime system configurations (often called modes) and...
Today's society increasingly depends on software systems deployed in large companies, banks, airports, and so on. These systems must be available 24/7 and continuously adapt to varying environmental conditions and requirements. Such dynamically adaptive systems exhibit degrees of variability that depend on user needs and runtime fluctuations in their contexts. The paper presents an approach for specifying...
The invasiveness of aspects is beneficial to modularize crosscutting concerns that require the modification of the data or control flow. However, it introduces subtle errors that are hard to locate and fix in case of evolution. In this paper we illustrate this issue by evolving a program implemented using aspects. Interaction issues, between aspects and the program, emerge from this evolution. We...
In a highly dynamic environment, software systems requires a capacity of self-adaptation to fit the environment and the user needs evolution, which increases the software architecture complexity. Despite most current execution platforms include some facilities for handling dynamic adaptation, current design methodologies do not address this issue. One of the requirement for such a design process is...
Component-based software development (CBSD) has proven to obtain highly reusable, extensible and evolvable designs. This paper presents a model-driven engineering approach to CBSD which revolves around the definition of the V3Studio component-based meta-model and a set of graphical modeling tools implemented to support it. V3Studio has been designed to model the structure and behavior of a wide variety...
Large models for complex systems can be decomposed in separate pieces corresponding to different perspectives on the system. This decomposition allows the modeller to check properties locally on some aspects of the system before considering the global complexity of the model. In this paper we consider two types of decomposition: according to the concerns identified in the requirements and according...
Software architectures must frequently evolve to cope with changing requirements, and this evolution often implies integrating new concerns. Unfortunately, existing architecture description languages provide little or no support for this kind of evolution. The software architect must modify the architecture manually, which risks introducing inconsistencies. In previous work, we have proposed the TranSATframework,...
Software architecture is a key concept in the design of a complex system. An architecture models the structure and behavior of the system, including the software elements and the relationships between them. While architectures were originally specified informally, recent years have seen the creation of a number of Architecture Description Languages (ADLs) [4]. ADLs are designed around the dimensions...
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