Context Aggregation and Dissemination in Ubiquitous Computing Systems
DARTMOUTH COLL HANOVER NH
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Many ubiquitous computing applications need a constant flow of information about their environment to be able to adapt to their changing context. To support these context-aware applications we propose a graph-based abstraction for collecting, aggregating, and disseminating context information. The abstraction models context information as events, produced by sources and flowing through a directed acyclic graph of event-processing operators and delivered to subscribing applications. Applications describe their desired event stream as a tree of operators that aggregate low-level context information published by existing sources into the high-level context information needed by the application. The operator graph is thus the dynamic combination of all applications subscription trees.
- Computer Systems