TY  - JOUR
A1  - Lincke, Jens
A1  - Appeltauer, Malte
A1  - Steinert, Bastian
A1  - Hirschfeld, Robert
T1  - An open implementation for context-oriented layer composition in ContextJS
JF  - Science of computer programming
N2  - Context-oriented programming (COP) provides dedicated support for defining and composing variations to a basic program behavior. A variation, which is defined within a layer, can be de-/activated for the dynamic extent of a code block. While this mechanism allows for control flow-specific scoping, expressing behavior adaptations can demand alternative scopes. For instance, adaptations can depend on dynamic object structure rather than control flow. We present scenarios for behavior adaptation and identify the need for new scoping mechanisms. The increasing number of scoping mechanisms calls for new language abstractions representing them. We suggest to open the implementation of scoping mechanisms so that developers can extend the COP language core according to their specific needs. Our open implementation moves layer composition into objects to be affected and with that closer to the method dispatch to be changed. We discuss the implementation of established COP scoping mechanisms using our approach and present new scoping mechanisms developed for our enhancements to Lively Kernel.
KW  - ContextJS
KW  - Context-oriented programming
KW  - Open implementations
KW  - Dynamic adaptation
KW  - Scope
Y1  - 2011
U6  - https://doi.org/10.1016/j.scico.2010.11.013
SN  - 0167-6423
VL  - 76
IS  - 12
SP  - 1194
EP  - 1209
PB  - Elsevier
CY  - Amsterdam
ER  -