Dipl. Inform. Holger Rasch

 

1 Publications (with abstarcts)

[MORW08]

M. Möller, E.-R. Olderog, H. Rasch, and H. Wehrheim. Integrating a formal method into a software engineering process with UML and Java. Formal Apsects of Computing, 20:161-204, 2008.
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We describe how CSP-OZ, a formal method combining the process algebra CSP with the specification language Object-Z, can be integrated into an object-oriented software engineering process employing the UML as a modelling and Java as an implementation language. The benefit of this integration lies in the rigour of the formal method, which improves the precision of the constructed models and opens up the possibility of (1) verifying properties of models in the early design phases, and (2) checking adherence of implementations to models. The envisaged application area of our approach is the design of distributed reactive systems. To this end, we propose a specific UML profile for reactive systems. The profile contains facilities for modelling components, their interfaces and interconnections via synchronous/broadcast communication, and the overall architecture of a system. The integration with the formal method proceeds by generating a significant part of the CSP-OZ specification from the initially developed UML model. The formal specification is on the one hand the starting point for verifying properties of the model, for instance by using the FDR model checker. On the other hand, it is the basis for generating contracts for the final implementation. Contracts are written in the Java Modeling Language (JML) complemented by , an assertion language for specifying orderings between method invocations. A set of tools for runtime checking can be used to supervise the adherence of the final Java implementation to the generated contracts.

[MORW04]

M. Möller, E.-R. Olderog, H. Rasch, and H. Wehrheim. Linking CSP-OZ with UML and Java: A Case Study. In E. Boiten, J. Derrick, and G. Smith, editors, Integrated Formal Methods, number 2999 in Lecture Notes in Computer Science, pages 267-286. Springer-Verlag, March 2004.
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We describe how CSP-OZ, an integrated formal method combining the process algebra CSP with the specification language Object-Z, can be linked to standard software engineering languages, viz. UML and Java. Our aim is to generate a significant part of the CSP-OZ specification from an initially developed UML model using a UML profile for CSP-OZ, and afterwards transform the formal specification into assertions written in the Java Modelling Language JML complemented by CSP_jassda. The intermediate CSP-OZ specification serves to verify correctness of the UML model, and the assertions control at runtime the adherence of a Java implementation to these formal requirements. We explain this approach using the case study of a ``holonic manufacturing system'' in which coordination of transportation and processing is distributed among stores, machine tools and agents without central control.

[RW03]

H. Rasch and H. Wehrheim. Checking Consistency in UML Diagrams: Classes and State Machines. In E. Najm, U. Nestmann, and P. Stevens, editors, Formal Methods for Open Object-based Distributed Systems, volume 2884 of LNCS, pages 229-243. Springer, 2003.
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[RW02]

H. Rasch and H. Wehrheim. Consistency between UML classes and associated state machines. In L. Kuzniarz, G. Reggio, J. L. Sourrouille, and Z. Huzar, editors, UML 2002 - Workshop on Consistency Problems in UML-based Software Development, volume 06, pages 46-60, 2002.
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