Title:	IMPROVING QUALITY OF WEB SERVICES BY USING REPLICATION
Author(s):	Dirk Thißen , Thomas Brambring
ISBN:	978-972-8924-68-3
Editors:	Pedro Isaías, Miguel Baptista Nunes and Dirk Ifenthaler
Year:	2008
Edition:	Single
Keywords:	Web services, replication, quality of service, proxy
Type:	Full Paper
First Page:	283
Last Page:	290
Language:	English
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Full Contents:	click to dowload
Paper Abstract:	Web services define a kind of middleware for implementing distributed applications independent of used platforms and programming languages. In the development of new software systems, functionality of existing services can be re-used to reduce development time and costs. This process of re-use can be done by web service composition. But, current web service standards are not equipped to consider non-functional requirements, i.e. quality of service (QoS) aspects of a user to a service, neither in the development of single services, nor in composed services. Thus, capabilities of services, especially of composed services cannot be guaranteed. This paper presents an approach to consider QoS aspects of web services by using service replication. When a user needs to select a service for usage from a service registry, possible candidates are chosen depending on the QoS requirements of a user to the service. Replication now ensures that the QoS requirements are not only considered at service selection time, but also can be granted at service runtime. To do so, integrated in the service selection it is decided if and how a service has to be replicated for fulfilling the user’s requirements. A flexible replication architecture is developed, supporting different replication strategies to give guarantees for several user requirements.
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