Context Distribution for Supporting Composition of Applications in Ubiquitous Computing
Résumé
For context-aware devices and applications to be able to interact both with each other and their environment, mechanisms are required to allow these to react to changes in the environment. Furthermore, individual applications participating in a context must work together in an integrated and coherent manner. To address this concern, we have designed and implemented CARBO, a generative, rule based centralized orchestration engine. However, in ubiquitous computing, context is distributed amongst different participants. In this paper we describe how we extended CARBO with the notion of context slices, which distribute the context state amongst different devices. We also discuss the use of tagged futures as an implementation strategy. This simplifies the work needed to synchronize context instances across devices, which eases the maintenance of context consistency.
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