Information and Media Technologies
Online ISSN : 1881-0896
ISSN-L : 1881-0896
Introducing Composite Layers in EventCJ
Tetsuo KaminaTomoyuki AotaniHidehiko Masuhara
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2013 Volume 8 Issue 2 Pages 279-286


Context-oriented programming (COP) languages provide a modularization mechanism called a layer, which modularizes behaviors that are executable under specific contexts, and specify a way to dynamically switch behaviors. However, the correspondence between real-world contexts and units of behavioral variations is not simple. Thus, in existing COP languages, context-related concerns can easily be tangled within a piece of layer activation code. In this paper, we address this problem by introducing a new construct called a composite layer, which declares a proposition in which ground terms are given other layer names (true when active). A composite layer is active only when the proposition is true. We introduce this construct into EventCJ, out COP language, and verify this approach by conducting two case studies involving a context-aware Twitter client and a program editor. The results obtained in our approach show that the layer activation code is simple and free from tangled context-related concerns. We also discuss the efficient implementation of this mechanism in EventCJ.

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© 2013 Information Processing Society of Japan
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