Moving from Specifications to Contracts in Component-Based Design

摘要

We study the relation between specifications of component behaviors and contracts providing means to specify assumptions on en vironments as well as component guarantees. We show how a contract framework can be built in a generic way on top of any specification theory which supports composition and specification refinement. Our contract framework lifts refinement to the level of contracts and proposes a notion of contract composition on the basis of dominating contracts. Contract composition satisfies a universal property and can be constructively de fined if the underlying specification theory is complete, i.e. it offers op erators for quotienting and conjoining specifications. We illustrate our generic construction of contracts by moving a specification theory for modal transition systems to contracts and we show that a (previously proposed) trace-based contract theory is an instance of our framework.