Dependable Composite Web Services with Components Upgraded Online

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 for dependable upgrading in which natural redundancy, formed by the latest and the previous releases of a WS being kept operational, is used. The paper describes how `confidence in correctness' can be systematically used as a measure of dependability of both the component and the composite WSs. We discuss architectures for a composite WS in which the upgrade of the component WS is managed by switching the composite WS from using the old release of the component WS to using its newer release only when the confidence is high enough, so that the composite service dependability will not deteriorate as a result of the switch. The effec...

• Type: Conference
• Year: 2004
• Where: ICSE
• Authors: Anatoliy Gorbenko, Vyacheslav S. Kharchenko, Peter T. Popov, Alexander B. Romanovsky
• Keywords: Component Ws, Component Wss, Composite Ws, ICSE 2004, Software Engineering