RCal: a case study on semantic web agents
Proceedings of the first international joint conference on Autonomous agents and multiagent systems: part 2
Labscape: A Smart Environment for the Cell Biology Laboratory
IEEE Pervasive Computing
Calendar Agents on the Semantic Web
IEEE Intelligent Systems
The design and applications of a context service
ACM SIGMOBILE Mobile Computing and Communications Review
iQueue: A Pervasive Data Composition Framework
MDM '02 Proceedings of the Third International Conference on Mobile Data Management
Architectural Mismatch in Service-Oriented Architectures
SDSOA '07 Proceedings of the International Workshop on Systems Development in SOA Environments
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Service-based computing is rapidly replacing the more-traditional approaches to architecting distributed systems. The critical advantage of service-based architectures is that they require only a specification of protocol, and not of API. As such, they engender a significantly looser coupling than prior techniques, thus facilitating seamless collaboration across systems and across administrative domains.A Service-Oriented Architecture (SOA) is a middleware platform that provides a service-based computing environment. The "publish-find-bind" paradigm at the core of SOA enables the development of service-provision software separately from the development of service-consumption software. Closer observation of each aspect in this paradigm reveals that significant developer involvement is still required to assist the interaction between service provider and consumer. Developers of service-consumer software make the decision to employ a set of service providers at development time. Some SOAs provide facilities to programmatically search, bind, and even invoke services dynamically. However, it is still assumed that knowledge of both service providers and the service provided is known at development time, or the client must supply highly-detailed information about services they wish to use. This severely limits the possibility of dynamic run-time interactions among service providers and service consumers.In this paper we introduce EDRA, the Event-Driven Response Architecture for service-based computing. EDRA is a software framework that provides an infrastructure to dynamically select client-relevant service providers during run-time. Information services selected by EDRA on behalf of clients may send notification events in case of changes in the service. In such cases, our runtime will automatically process the notification based on a selection of user-choice, system defaults, and available action services. We have implemented a prototype of our framework, and show its operation in the domain of airline services.