Parallel Object-Oriented Specification Language Research Articles

Patterns for Automatic Generation of Soft Real-time System Models

Worst-case assumptions about the timing of systems are often too conservative when analyzing distributed soft real-time systems as they lead to over-dimensioned and expensive products. For these systems, a certain percentage of deadline misses is often affordable. Instead of a binary answer regarding the schedulability of such a system, a more interesting metric is the degree to which the system meets the timing requirements. For this, an appropriate model that realistically expresses the behavior of a soft real-time system when deployed on a multiprocessor platform should be built and analyzed. In this article, we present such a modeling approach based on the formal modeling language POOSL (parallel object-oriented specification language). Moreover, to alleviate the process of modeling, we present a pattern-based description language that allows an application, together with the multiprocessor platform and the deployment to be described in a concise way. Such a pattern-based description can be translated automatically into an executable POOSL model through which performance properties can be analyzed based on simulations. The suitability of our approach is demonstrated by exploring the design space of a distributed in-car radio navigation system.

Performance modelling of a network processor using POOSL

The increasing complexity of innovative real-time hardware/software systems forced industry to consider system-level design methods. Before actually implementing a system with hardware and software components, system-level design methods enable analysing the performance of different design alternatives that realise the required functionality. In order to develop performance models early in the design process, the parallel object-oriented specification language (POOSL) can be used. POOSL is an expressive modelling language for analysing complex real-time distributed hardware/software systems. Being equipped with a formal semantics, POOSL ensures unambiguous execution of models and proper application of performance analysis techniques. This paper discusses the use of POOSL for analysing the performance of a network processor. A network processor consists of components that perform their behaviour in a synchronously concurrent way, whereas POOSL is based on an asynchronous modelling paradigm. In this paper, we illustrate that constructing abstract models of synchronous systems for the purpose of performance analysis may benefit from an asynchronous modelling approach.

A Maude specification of an object-oriented model for telecommunication networks

This paper presents an object-oriented model for broadband telecommunication networks, which can be used both for network management and for network planning purposes. The object-oriented model has been developed using the parallel object-oriented specification language Maude, which allows us to define not only structural aspects of the model but also procedural aspects. The reflective properties of rewriting logic are applied to control the rewriting process, using a strategy language that can be specified internally to the logic. Several modeling approaches are compared, emphasizing the definition of the object relationships and the benefits obtained from using reflection as opposed to the extra effort required to control the process at the object level itself.

A Maude specification of an object-oriented database model for telecommunication networks

This paper presents an object-oriented database model for broadband telecommunication networks, which can be used both for network management and for network planning purposes. The object-oriented data model has been developed using the parallel object-oriented specification language Maude [8,11], which allows us to define not only structural aspects of the database, but also procedural aspects. Several modeling approaches are compared, emphasizing the definition of the object relationships and some of the procedural aspects of the model.