Using Assertions to Enhance the Correctness of Kmelia Components and their Assemblies

摘要

TheKmeliacomponent model is an abstract formal component model based on services. It is dedicated to the specification and development of correct components. This work enriches theKmelialanguage to allow the description of data, expressions and assertions when specifying components and services. The objective is to enable the use of assertions inKmeliain order to support expressive service descriptions, to support client/supplier contracts with pre/post-conditions, and to enhance formal analysis of component-based systems. Assertions are used to perform analysis of services, component assemblies and service compositions. Additionally we enable the definition of virtual contexts for required services and the corresponding observable state space for the components which provide the services. We illustrate the work with the verification of consistency properties involving data at component and assembly levels.