Dynamic Contextual Service Ranking

Abstract

This paper explores service composition in pervasive environments with a focus on dynamic service selection. Service orientation offers the dynamism and loose coupling needed in pervasive applications. However, contextaware service composition is still a great challenge in pervasive computing. Service selection has to deal with dynamic contextual information to enable context-aware behaviors to emerge from the environment. This paper describes how to add dynamic contextual service ranking mechanisms to the serviceoriented OSGi framework and further discusses service re-composition decisions.

A context aware framework for services management in the transportation domain

“…The decision making for service switching is automated thought the availability, or not, of the different service components. More fine grain decision could also be implemented according to service ranking [12].…”

Towards a SLA-based Approach to Handle Service Disruptions

“…A service provider can therefore be dynamically substituted by another if the provider disappears or if another provider offers better contract conditions [11]. Let's consider a building automation example.…”

“…Context ranking selection [11] proposes a refined service selection by extending the Declarative Services model with definition of preferences depending on the context. In a different way, probabilistic selections [20] in disconnected and mobile ad-hoc networks take into account the disruption probability of available services in order to select the services to bind and to invoke.…”

On the Design of a SIP-Based Binding Middleware for Next Generation Home Network Services

“…The Context Manager exploits naturally the OSGi service registry dynamic behavior to subscribe to given system changes. The latter are not only the appearance and the disappearance of the media devices but also the device property changes that are directly performed by the context manager on the registered service references [23]. The Adaptation Manager component is responsible for reasoning on context changes and taking decisions whenever an adaptation is required.…”