Improving scalability of event-driven distributed objects architectures

The goal of this paper is to present practical techniques for improving the scalability of a distributed objects architecture built around an event-dr iven paradigm and the evaluation of their effectiveness in the case of loca tion systems. As a case study, the ABng location system constructed using a publisher/subscriber pattern over a CORBA compliant middleware is presente d. The main contribution of this paper is the elaboration and evaluation of three main concepts that play a crucial role in improving the scalability of event-driven architectures: events dissemination quality of service, not ification tree based events-routing, and transparent multicast event-channe l notification service. The applicability and efficiency of these technique s have been verified in practice by the ABng system implementation and perf ormance testing. Copyright (C) 2000 John Wiley & Sons, Ltd.