Towards an implementation-oriented specification of TP protocol in LOTOS
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This paper presents an exercise in the specification and implementation design of a realistic OSI Application-layer protocol in accordance with the LotoSphere methodology. It also reports some of the experiences acquired during the design process. The main motivation of the work presented is the need to have a genuine assessment of the design methodology for its industrial applicability.
The OSI Transaction Processing protocol is selected as a design example due to its distributed nature and its entangled compositional structure, comprising of OSI common application service elements, i.e. AC-SE and CCR-SE, and TP specific elements. This paper focusses on the design trajectory of the TP specific parts.
The design process starts with an informal protocol description and after several design steps ends with an implementation specified in LOTOS. This process is globally constrained by realizability and open-endedness requirements. The derived implementation is expressed in a state(-machine) oriented way and is in a design sense close to a realization. UNIX workstations with a running ISODE are selected as realization environment. An alternative design approach which suitably fits ISODE is exposed but not elaborated. A second design cycle has been undertaken to enable some evaluation of the open-endedness of the specification.
KeywordsDesign Step Design Cycle Transaction Processing Realization Phase Service Element
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