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(2006)Conference PaperWeb services solutions are being increasingly adopted in enterprise systems. However, ensuring the quality of service of Web services applications remains a costly and complicated performance engineering task. Some of the new challenges include limited controls over consumers of a service, unforeseeable operational scenarios and vastly different XML payloads. These challenges make existing manual performance analysis and benchmarking methods difficult to use effectively. This paper describes an approach for generating customized benchmark suites for Web services applications from a software architecture description following a Model Driven Architecture (MDA) approach. We have provided a performance-tailored version of the UML 2.0 Testing Profile so architects can model a flexible and reusable load testing architecture, including test data, in a standards compatible way. We extended our MDABench [27] tool to provide a Web service performance testing “cartridge” associated with the tailored testing profile. A load testing suite and automatic performance measurement infrastructure are generated using the new cartridge. Best practices in Web service testing are embodied in the cartridge and inherited by the generated code. This greatly reduces the effort needed for Web service performance benchmarking while being fully MDA compatible. We illustrate the approach using a case study on the Apache Axis platform.
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(2006)Conference Paper
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(2006)Conference PaperA framework for analysis of the potential impact and viability of the manufacture of photovoltaic systems components in developing countries is presented. At the small-scale, the potential of local manufacture to contribute to local livelihoods, and to have positive synergies that improve the installation, maintenance and use of PV systems for rural electrification is investigated through case studies and existing literature. The circumstances under which manufacture may be feasible and financially and socially sustainable are considered in the light of the evidence from the research and related literature. Interventions that may best support the local manufacture are suggested.
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(2006)Conference Paper
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(2006)Conference Paper