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Akşit, M. and Bosch, H.G.P. and van der Sterren, W. and Bergmans, L.M.J.
(1994)
Real-Time Specification Inheritance Anomalies and Real-Time Filters.
In: ECOOP'94, 4-8 July 1994, Bologna, Italy.
pp. 386-407.
Lecture Notes in Computer Science 821.
Springer.
ISSN 0302-9743
ISBN 3540582029
Full text available as:
AbstractReal-time programs are, in general, difficult to design and verify. The inheritance mechanism can be useful in reusing well-defined and verified real-time programs. In applications developed by current real-time objectoriented languages, however, changing application requirements or changing real-time specifications in subclasses may require excessive redefinitions although this seems to be intuitively unnecessary. We refer to this as the real-time specification inheritance anomaly. This paper introduces three kinds of real-time specification inheritance anomalies that one may experience while constructing object-oriented programs. As a solution to these anomalies, the concept of real-time composition filters is introduced. Filters affect the real-time characteristics of messages that are received or sent by an object. Through proper configuration of filters, one can specify real-time constraints, and reuse of these constraints without causing inheritance anomalies.
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