ISSN : 1796-217X
Volume : 3    Issue : 4    Date : April 2008

A Constraint-Driven Executable Model of Dynamic System Reconfiguration
D’Arcy Walsh, Francis Bordeleau, and Bran Selic
Page(s): 37-50
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Dynamic system reconfiguration techniques are presented that can enable the systematic evolution
of software systems due to unanticipated changes in specification or requirements. The
methodological approach is based upon a domain analysis, which identifies a set of concepts that
reflect the types of reconfigurations possible and the system integrity characteristics that must be
maintained during such reconfigurations, a domain design, which is expressed using the Unified
Modeling Language (UML) as a constraint-driven representation of the domain analysis, and a
domain implementation, which uses a programming environment that supports explicit metaclass
programming to realize an executable model of the analysis and design. It was learned that explicit
metaclass programming can effectively be used to encode the constrained model, as a static
representation, at the metalevel. With respect to dynamic reconfiguration, it was learned that a base-
level object could be an instance of a property metaclass that is unique to that base-level object.
Through a mixin mechanism, emergent run-time properties could be dynamically applied just to that
object. The set of available mixins should also be adjusted dynamically. This is the subject of future

Index Terms
Component-based systems, Dynamic reconfiguration, Feature modeling, Model-driven
development, Service-oriented Architecture, Software evolution, System integrity, UML