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Object-Oriented Inheritance Metrics in the Context of Cognitive Complexity

Mishra D., Mishra A.

Fundamenta Informaticae

2011

Vol. 111, nr 1

91-117

It is important to identify modules that are fault prone or exhibit evidence of high cognitive complexity as these modules require corrective actions such as increased source code inspection, refactoring or performing more exhaustive testing. This can lead to a better quality software system. It has been found that inheritance has an impact on the cognitive complexity of a software system. In this paper, two inheritance metrics based on cognitive complexity, one at class level CCI (Class Complexity due to Inheritance) and another at program level ACI (Average Complexity of a program due to Inheritance), have been proposed for object-oriented software systems. Additionally, one more metric MC (Method Complexity) has been proposed to calculate the complexity of a method. These proposed metrics are compared with some well known object-oriented inheritance metrics by calculating their values for three random C++ programs. It has been observed that CCI and ACI are better to represent cognitive complexity due to inheritance than other well known class level and program level inheritance metrics.

Towards a framework for modelling systems with rich internal structures of states and processes

Winkowski J.

Prace Instytutu Podstaw Informatyki Polskiej Akademii Nauk

2004

Nr 973

1-36

The paper is concerned with modelling object-oriented distributed computational systems. Systems are modeled by specifying their states and processes. Processes of a system are defined as activities in a universe of objects, each object with a set of possible states, each activity changing states of some objects and establishing or destroying relations among objects. Partial operations on processes of a system are defined, including an operation that allows one to compose processes whenever one process is a continuation of another. It is shown that the set of processes of a system from together with these operations a category with an additional structure and special properties. In particular, independence of processes can be characterized in a natural, purely algebraic way.

Praca dotyczy modelowania obiektowo zorientowanych rozproszonych systemów komputerowych. Systemy są modelowane przez specyfikowanie ich stanów i procesów. Procesy systemu są definiowane jako działania w pewnym uniwersum obiektów, gdzie każdy obiekt ma zbiór możliwych stanów a każda działalność zmienia stany niektórych obiektów i tworzy lub likwiduje relacje między obiektami. Zdefiniowano operacje na procesach systemu, w tym operację pozwalającą składać procesy z których jeden jest kontynuacją drugiego. Pokazano, że zbiór procesów systemu wyposażony w te operacje jest kategorią z dodatkową strukturą i specyficznymi własnościami. W szczególności, niezależność procesów daje się scharakteryzować algebraicznie.