Qos Formal Specification of Engineering Language

Distributed systems can be very large and complex and the many different considerations which influence their design can result in a substantial body of specification, which needs a structuring framework if it is to be managed successfully. The purpose of the RM-ODP is to define such a framework. The Reference Model for Open Distributed Processing (RM-ODP) provides a framework within which support of distribution, inter-working and portability can be integrated. It defines: an object model, architectural concepts and architecture for the development of ODP systems in terms of five viewpoints. Each viewpoint language defines concepts and rules for specifying ODP systems from the corresponding viewpoint. These viewpoints include an Engineering viewpoint, which focuses on the concepts for describing the infrastructure required to support selective distribution transparent interactions between objects. QoS-ODP management is now an important research topic for many universities, institutes and industrial organizations. Several approaches are being used in the field of the formalization of QoS-ODP. The use of formal methods in the design process of ODP systems is explicitly required. An important point to take into account is the incorporation of the many proofs which have to be performed in order to be sure that the final system will be indeed ”correct by construction”. The Event-B method is being defined as a formal notation. In this paper, we explore the benefits provided by using the proof construction approach to define the protocol of negotiating QoS requirements When engineering objects in different clusters interact. In this context, we investigate the support for the specification of Quality of Service (QoS) in Event-B when modelling open distributed System in the Engineering viewpoint.