Frederico Lopes,  Thais Vasconcelos Batista,  Flavia C. Delicato,  Nélio Cacho. 

Ubiquitous applications require middleware support for handling contextual information. The use of mechanisms for event composition along with such middlewares are needed to aggregate individual, low-level events generated by heterogeneous sources in high level contextual information with value added for applications. This paper presents the architecture of the integration of CES (Composite Event System) with context provision middlewares. With such integration applications use CES to subscribe for composite contextual events and CES, in turn, subscribes for primitive events with the appropriate middlewares and notifies applications when the composite events occurs. The paper presents the implementation of CES with MoCA and Context Toolkit as well as a case study for ubiquitous computing, a System of Meeting Detection.

http://www.lbd.dcc.ufmg.br:8080/colecoes/sbrc/2008/008.pdf

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