JOpera: a Toolkit for Efficient Visual Composition of Web Services

Publication Type  Journal Article
Year of Publication  2004
Authors  Pautasso, C.; Alonso, G.
Journal Title  International Journal of Electronic Commerce (IJEC)
Volume  9
Issue  2
Pages  107-141
Journal Date  Winter 2004/2005
ISSN Number  1086-4415
Key Words  Scalable Process Execution; Visual Programming Languages; Web Service Composition
Abstract  Web services are attracting attention because of their ability to provide standard interfaces to heterogeneous distributed services. Standard interfaces make it possible to compose more complex services out of basic ones. This paper tackles the problem of visual service composition and the efficient and scalable execution of the resulting composite services. The effort revolves around the JOpera system, which combines a visual programming environment for Web services with a flexible execution engine that interacts with Web services through the simple object access protocol (SOAP), described with Web services language description (WSDL) and registered with a universal description discovery and integration (UDDI) registry. The paper explains the syntax and implementation of the JOpera Visual Composition Language (JVCL) and its ability to provide different quality of service (QoS) levels in the execution of composite services.
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