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In this paper, we argue that there is a need for an event-based middleware to build large-scale distributed systems. Existing publish/subscribe systems still have limitations compared to invocation-based middlewares. We introduce Hermes, a novel event-based distributed middle-ware architecture that follows a type-and attribute-based publish/subscribe model.(More)
R egistered parties behind firewalls in strictly controlled environments carry out most substantial, accountable computation. However, pervasive computing foresees a massively networked infrastructure supporting a large population of diverse but cooperating entities. Entities will be both autonomous and mobile and will have to handle unforeseen(More)
OASIS is a role-based access control architecture for achieving secure interoperation of services in an open, distributed environment. Services define roles and implement formally specified policy for role activation and service use; users must present the required credentials, in the specified context, in order to activate a role or invoke a service. (More)
Overlay broker networks are an important part of an event-based middleware. In this paper, we investigate the requirements of overlay broker networks and argue that using peer-to-peer techniques for their creation and the content-based routing of events has many advantages. We support our claims with an experimental evaluation of Hermes, an event-based(More)
Industry We have performed an in-depth analysis of the chameleon carrier problem, and have identified the causes as well as potential solutions. Our team also has years of combined knowledge regarding motor carrier credentials and associated fees and taxes. We performed an analysis of various Kentucky Department of Vehicle Regulation (DVR) fees and taxes(More)
For large-scale distributed applications such as internet-wide or ubiquitous systems, event-based communication is an effective messag-ing mechanism between components. In order to handle the large volume of events in such systems, composite event detection enables application components to express interest in the occurrence of complex patterns of events.(More)
Research into publish/subscribe messaging has so far done little to propose architectures for the support of access control, yet this will be an increasingly critical requirement as systems move to Internet-scale. This paper discusses the general requirements of publish/subscribe systems with access control. We then present our specific integration of OASIS(More)
The thesis of this paper is that, using our event-based development principles, components that were not designed to interoperate, can be made to work together quickly and easily. The only requirement is that each component must be made event-based by adding an interface for registering interest in events and an interface for injecting actions. A component(More)