Transformational design of an interactive component straddling communication streams
Journal of Computational Methods in Sciences and Engineering - Selected papers from the International Conference on Computer Science, Software Engineering, Information Technology, e-Business, and Applications, 2004
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The paper studies the top-down design of a basic interaction pattern for asynchronously communicating components. The interaction pattern describes a high level protocol where an active sender component transmits messages to a passive receiver component controlled by the receiver's acknowledgements. The formal design refines the components' input/output behaviour into a state-based implementation based on three transformation steps. An architectural refinement decomposes the protocol function into a sender component and into a receiver component introducing a feedback channel. The differentiation localizes the effect of single inputs wrt. a previous input history. The history abstraction extracts the components' control state and data state from the input history.