Vyacheslav S. Kharchenko

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Achieving high dependability of Web Services (WSs) dynamically composed from component WSs is an open problem. One of the main difficulties here is due to the fact that the component WSs can and will be upgraded online, which will affect the dependability of the composite WS. The paper introduces the problem of component WS upgrade and proposes solutions(More)
Exception handling is one of the popular means used for improving dependability and supporting recovery in the Service-Oriented Architecture (SOA). This practical experience paper presents the results of error and fault injection into Web Services. We summarize our experiments with the SOA-specific exception handling features provided by the two development(More)
Ensuring dependability of composite Web services, dynamically composed of component Web services, is an open issue. One of the main difficulties here is due to the fact that component Web services can and will be upgraded online. The challenge is then to ensure that the overall dependability of the composite service is not undermined. The solutions we(More)
In this paper we present our practical experience in benchmarking a number of existing Web Services, and investigating the instability of their performance and the delays induced by the communication medium. We provide the results of statistical data analysis and discuss a technique of Web Services performance assessment taking out of the network delays. We(More)
Abstr act This paper puts forward a generic intrusion-avoidance architecture to be used for deploying web services on the cloud. The architecture, targeting the IaaS cloud providers, avoids intrusions by employing software diversity at various system levels and dynamically reconfiguring the cloud deployment environment. The paper studies intrusions caused(More)
This paper reports our practical experience of benchmarking a complex System Biology Web Service, and investigates the instability of its behaviour and the delays induced by the communication medium. We present the results of our statistical data analysis and the distributions, describing and predicting the response time instability typical of(More)
How dependability is to be assessed and ensured during Web Service operation and how unbiased and trusted mechanisms supporting this are to be developed are still open issues. This paper addresses the following questions: who should publish dependability parameters, in which way they should be distributed, and who (and how) should monitor these parameters(More)