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In this paper we present a model for delivering differentiated quality of service based on the value for the provider. The value for the provider is captured by taking into account the (i) client value, (ii) service value, and certain exogenous factors. We enumerate and articulate different dimensions which will affect these components. We present a couple of case studies to demonstrate the usefulness...
Performance of distributed applications over a wide area network (WAN) has remained an important issue as WAN conditions change over time. Networking community has employed various approaches to improve application performance by adapting to changes in WAN conditions. Composite web services with components distributed over a WAN pose similar performance problems, however, with a different set of challenges...
Web services provide an instantiation of the loosely coupled service-oriented architecture and facilitate the process of enterprise application integration by encapsulating information, software, and other resources. However, to exploit the true potential of web services, it is critical to develop technologies and tools for composing new services from existing ones. While numerous composition approaches...
Workflows often operate in volatile environments in which the component services' QoS changes frequently. Optimally adapting to these changes becomes an important problem that must be addressed by the Web service composition and execution (WSCE) system being utilized. We adopt the A-WSCE framework that utilizes a three-stage approach for composing and executing Web workflows. The A-WSCE framework...
Web services simplify enterprise application integration by facilitating reuse of existing components for creating new services. In a dynamic environment, it is imperative to design a Web service composition and execution (WSCE) system that adapts to failure of component services or changes in their QoS offerings. In this paper, we motivate a staged approach for adaptive WSCE (A-WSCE) that cleanly...
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