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Constraint-oriented style for object-oriented formal specification

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2 Author(s)
T. Bolognesi ; Ist. di Elaborazione dell'Inf., CNR, Pisa, Italy ; J. Derrick

The authors propose a specification style which combines the features and advantages of object-oriented and constraint-oriented system decomposition. A system description is decomposed into data handling objects, which usually reflect objects and individual operations in the real system, and temporal-ordering constraints, which capture aspects of functionality as behavioural sequences, with a possibility to also introduce entities which blur the distinction between these two extreme cases. Composition is achieved via synchronisation on shared operations: different objects/constraints insisting on an operation express different views on the enabling conditions and effects of that operation. Objects, constraints, and their composition can be formally specified in Object-Z, an object-oriented extension of the Z notation, with pure temporal ordering constraints equivalently expressed as transition graphs. However, expressing object/constraint compositions in Object-Z is cumbersome. This problem is solved by proposing a natural textual notation, called co-expression, which is a most direct description of an object/constraint interconnection graph, and we define a mapping from co-expressions to Object-Z. Thus, specifications in an object/constraint-oriented style can be conveniently written using transition graphs and interconnection diagrams mixed with Object-Z text, and then translated into this language

Published in:

IEE Proceedings - Software  (Volume:145 ,  Issue: 2 )