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A formal framework for on-line software version change

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3 Author(s)
Gupta, D. ; Dept. of Comput. Sci. & Eng., Indian Inst. of Technol., Kanpur, India ; Jalote, P. ; Barua, G.

The usual way of installing a new version of a software system is to shut down the running program and then install the new version. This necessitates a sometimes unacceptable delay during which service is denied to the users of the software. An online software replacement system replaces parts of the software while it is in execution, thus eliminating the shutdown. While a number of implementations of online version change systems have been described in the literature, little investigation has been done on its theoretical aspects. We describe a formal framework for studying online software version change. We give a general definition of validity of an online change, show that it is in general undecidable and then develop sufficient conditions for ensuring validity for a procedural language

Published in:

Software Engineering, IEEE Transactions on  (Volume:22 ,  Issue: 2 )

Date of Publication:

Feb 1996

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