Abstract
Atomically introducing changes to a group of classes is a challenging task. In addition, certain applications require that changes be applied dynamically without shutting down and restarting the application. In this paper we present an extension of classboxes to make them dynamic. A classbox is a kind of module that supports class extension (method addition and redefinition, and instance variable addition). Class extensions and definitions defined in a classbox represent an aspect. A classbox cross-cuts different classes by defining various extensions. In addition, with classboxes, aspects are dynamically applied to, removed from and hot-swapped in a system. Such aspects may crosscut a large number of classes which are extended by adding or redefining existing methods and adding new instance variables. Finally the aspects are scoped i.e., changes defined by a classbox are only visible inside this classbox and its clients.
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