A Rule-Based Approach Towards Context-Aware User Notification Services Richard Etter (Fraunhofer IPSI)Patricia Dockhorn Costa (TELIN) Tom Broens (TELIN)
Pervasive Computing Environments • Users are surrounded with ubiquitous communication and information technology. • Unobtrusive services assist users in their daily lives. • Context awareness has emerged as a central element in pervasive computing. • Notification services are key applications.
Requirements for a User Notification Service • Current middleware provides unified ways to subscribe to and manage context data. • Key Issues: • A flexible, efficient and convenient mechanism to allows user-applications to specify what changes in the environment should be notified to them. • Tailor the user notification to the user’s context.
ANS - A Rule-Based User Notification Service • A rule-based approach relieves user-application developers from regarding and logically combining multiple context sources in their application. • ANS provides an expressive and simple language that enables users (application developers) to state what they are interested in. • ANS provides notifications based on the user’s preferences and their current context
ANS Rule Language • The focus of the rule language is on the following qualities: • Expressive power: the language permits the specification of complex event relations. It allows the use of logical connectives (e.g., AND, OR, NOT) on conditions to build compound conditions. • Convenient use for application developers: It provides high-level constructs that facilitate event compositions. • Extensibility: The language allows the addition of new predicates to accommodate events being defined on demand.
ANS Rule Language Examples • Notify Jerry if his computer is online when he leaves his room. • Upon leaveRoom (Jerry, Room101) • When IsOnline (Jerry) • Do Notify (Jerry, “Jerry, your computer has been left on”)
Outlook • The Awareness and Notification Service is part of the middleware EU-project AMIGO. A first version of the service is currently being deployed in the AMIGO Ambient Intelligence Environments.
The End … • Thank you for your attention