The publish/subscribe (or pub/sub) paradigm is a simple and easy to use model for interconnecting applications in a distributed environment. Many existing pub/sub systems are based on pre-defined subjects, and hence are able to exploit multicast technologies to provide scalability and availability. An emerging alternative to subject-based systems, known as content-based systems, allow information consumers to request events based on the content of published messages. This model is considerable more flexible than subject-based pub/sub, however it was previously not known how to efficiently multicast published messages to interested content-based subscribers within a network of broker (or router) machines. This shortcoming limits the applicability of content-based pub/sub in large or geographically distributed settings. In this paper, we develop and evaluate a novel and efficient technique for multicasting within a network of brokers in a content-based subscription systems. thereby showing that content-based pub/sub can be deployed in large or geographically distributed settings.
By: Guruduth Banavar, Tushar Chandra,, Bodhi Mukherjee, Jay Nagarajarao, Robert E. Strom, Daniel C. Sturman
Published in: RC21386 in 1999
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