Adopting Architectural Event Modules for Modular Coordination of Multiple Applications

Nowadays, large-scale software systems consist of multiple applications, which interact with each other to fulfill desired system-level requirements. It is usually required to coordinate the interactions of the constituent applications to ensure that the system-level requirements are fulfilled. In this paper, we outline a set of requirements that must be fulfilled to facilitate the modular composition of multiple applications. We introduce the concept of architectural event modules, which are abstractions to represent constituent applications and their coordination logic in a modular and uniform way. We explain the implementation of this concept in the EventReactor language, and define their formal semantics in processing events using the UPPAAL toolset. We illustrate the suitability of architectural event modules in achieving modularity and loose coupling in the composition of multiple applications by means of a case study in the domain of energy-efficient computing