Meier R., Cahill V., ‘Exploiting proximity in event-based middleware for collaborative mobile applications’ in Lecture Notes in Computer, Distributed Applications and Interoperable Systems, 2893/2003, Springer Berlin / Heidelberg, 2003, pp 285 - 296
Middleware supporting event-based communication is widely
recognized as being well suited to mobile applications since it naturally
accommodates a dynamically changing population of interacting entities and
the dynamic reconfiguration of the connections between them.
STEAM is an event-based middleware designed for use in ad hoc networks.
STEAM differs from other event-based middleware in that its architecture does
not rely on the presence of any separate infrastructure, event notification filters
are distributed, and filtering may be applied to functional and non-functional
attributes. In particular, filters may be applied to either the subject or the
content of an event notification, or to non-functional attributes, such as location
and time. Filters may be used to define geographical areas within which event
notifications are valid, thereby bounding the propagation of these notifications.
Such proximity-based filtering represents a natural way to filter events of
interest in mobile applications.
This paper describes the architecture and implementation of STEAM and its use
of proximity-based filtering. In particular, we show how proximity-based
filtering can be used to reduce the number of events delivered to collaborative
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