Interactions among dynamic sets of objects

In this paper, we present an operator to model interactions among objects. Our proposal allows a variable number of participant objects in an interaction, and this number will be fixed during the execution of the model. This provides a very flexible interaction model based on synchronous interactions among several objects. Our interaction model is based on events and allows a multiple-way communication among objects. Concrete values of a communication are generated through constraints which are imposed locally on each participant object. The proposed interaction (and communication) model is very versatile and can be used as an abstract specification mechanism.