Differentiated service

About: Differentiated service is a research topic. Over the lifetime, 5539 publications have been published within this topic receiving 105225 citations.

Advanced event processing and notifications in service runtime environments

Abstract: Service-oriented Architecture (SOA) and Web services have become widely adopted for building cross-organizational and flexible applications Yet, there is one issue inherent to this paradigm: services are changing regularly Using the publish/subscribe style, subscribers can be notified when such changes occur In current service registry standards, however, notifications are mainly used to inform about changes in the registry data, which does not include service runtime information In this paper, we present an approach that leverages event processing mechanisms for Web services based on a rich event model that supports the full service lifecycle, including runtime information concerning service discovery and service invocation, as well as Quality of Service attributes Furthermore, besides subscribing to events of interest, users can also search in historical event data

A Pattern-Based Approach to Development of Service Mediators for Protocol Mediation

Abstract: Service composition is one of the key objectives for adopting service oriented architecture. Today, Web services, however, are not always perfectly compatible and composition mismatches are common problems. Service mediation, generally classified into signature and protocol ones, thus becomes one key working area in SOA. While the former has received considerable attention, protocol mediation is still open and current approaches provide only partial solutions. In this paper, a pattern-based approach is proposed for developers to semi-automatically generate mediators and glue partially compatible services together. Based on the investigation on workflow patterns and message exchanging sequences in service interactions, several basic mediator patterns are developed and can be used to modularly construct advanced mediators that can resolve all possible protocol mismatches, especially such mismatches about complicated control logics. Moreover, the architecture for the service mediation system is designed and implemented to prove the feasibility of our approach.

Improving service matching and selection in ubiquitous computing environments: a user study

Abstract: In large ubiquitous computing environments it is hard for users to identify and activate the electronic services that match their needs. This user study compares the newly developed service matcher system with a conventional system for identifying and selecting appropriate services. The study addresses human factors issues such as usability, trust and service awareness. With the conventional system users have to browse a hierarchical list of currently available services and activate the service that they think satisfies their current needs. With the service matcher users just enter their current need using natural language, after which a wizard, emulating an existing service matcher algorithm, searches for and activates a matching service based on the given need and the users’ location and gaze direction. This study shows that with the hierarchical list, only 66% of the tasks are solved correctly, and females score significantly worse than males. With the service matcher, the performance increases significantly to 84% correctly performed tasks and the gender difference disappears.

Secure consumer authorization and automated consumer services using an intermediary service

Abstract: A transaction processing service that operates as an intermediary between aggregators of transaction requests, service providers, consumers, and third-party recipients of data, is disclosed. As used herein, a transaction request is a request for consumer services to be provided to a consumer or third-party, a consumer's authorization of such consumer services, and/or a consumer's authorization of applicable terms, policies, contracts, or agreements. The intermediary service utilizes a consumer's mobile device as an out-of-band communication channel to notify a consumer of a received transaction request and to receive a consumer's authorization of the transaction. Once a transaction is authorized, the intermediary service facilitates the consumer services related to the transaction and provides a service response from one or more service providers to the user's mobile device and/or another service target.

Towards practical semantic web service discovery

Abstract: Service orientation is a promising paradigm for offering and consuming functionalities within and across organizations. Ever increasing acceptance of service oriented architectures in combination with the acceptance of the Web as a platform for carrying out electronic business triggers a need for automated methods to find appropriate Web services. Various formalisms for discovery of semantically described services with varying expressivity and complexity have been proposed in the past. However, they are difficult to use since they apply the same formalisms to service descriptions and requests. Furthermore, an intersection-based matchmaking is insufficient to ensure applicability of Web services for a given request. In this paper we show that, although most of prior approaches provide a formal semantics, their pragmatics to describe requests is improper since it differs from the user intention. We introduce distinct formalisms to describe functionalities and service requests. We also provide the formal underpinning and implementation of a matching algorithm.