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Querying Mediated Web Services
Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computing Science. (UDBL)
Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computing Science. (UDBL)
University of Colombo School of Computing.
2006 (English)In: Proceedings of the IITC Conference 2006: 8th International Information Technology Conference 2006, Sri Lanka: Infotel Lanka Society Ltd , 2006, 39-44 p.Conference paper, Published paper (Refereed)
Abstract [en]

Web services provide interfaces to web resources described by WSDL interface definitions. The Web Service MEDiator system (WSMED) enables querying data accessible through web services. WSMED allows web service meta-data to be automatically extracted from any WSDL description. Then views can be created in terms of the imported meta-data and queried using SQL. To enhance query performance, WSMED permits to complement the automatically extracted web service meta-data with semantic enrichments. A WSMED prototype is being evaluated over existing web services to verify the effectiveness of the approach. It is being investigated how semantic enrichments and other query optimization methods are useful for efficient querying of mediated web services.

Place, publisher, year, edition, pages
Sri Lanka: Infotel Lanka Society Ltd , 2006. 39-44 p.
Keyword [en]
Web Services, Views, Query Processing, Binding Patterns
National Category
Computer Science
Research subject
Computer Science with specialization in Database Technology
Identifiers
URN: urn:nbn:se:uu:diva-20019ISBN: 955-8974-04-8 (print)OAI: oai:DiVA.org:uu-20019DiVA: diva2:47791
Projects
Sida
Available from: 2007-08-16 Created: 2007-08-16 Last updated: 2010-08-30Bibliographically approved
In thesis
1. Querying Data Providing Web Services
Open this publication in new window or tab >>Querying Data Providing Web Services
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Web services are often used for search computing where data is retrieved from servers providing information of different kinds. Such data providing web services return a set of objects for a given set of parameters without any side effects. There is need to enable general and scalable search capabilities of data from data providing web services, which is the topic of this Thesis.

The Web Service MEDiator (WSMED) system automatically provides relational views of any data providing web service operations by reading the WSDL documents describing them. These views can be queried with SQL. Without any knowledge of the costs of executing specific web service operations the WSMED query processor automatically and adaptively finds an optimized parallel execution plan calling queried data providing web services.

For scalable execution of queries to data providing web services, an algebra operator PAP adaptively parallelizes calls in execution plans to web service operations until no significant performance improvement is measured, based on monitoring the flow from web service operations without any cost knowledge or extensive memory usage.

To comply with the Everything as a Service (XaaS) paradigm WSMED itself is implemented as a web service that provides web service operations to query and combine data from data providing web services. A web based demonstration of the WSMED web service provides general SQL queries to any data providing web service operations from a browser.

WSMED assumes that all queried data sources are available as web services. To make any data providing system into a data providing web service WSMED includes a subsystem, the web service generator, which generates and deploys the web service operations to access a data source. The WSMED web service itself is generated by the web service generator.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2010. 37 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 755
Keyword
views of web service operations, web service queries, adaptive parallelization, query optimization
National Category
Computer Science
Research subject
Computer Science with specialization in Database Technology
Identifiers
urn:nbn:se:uu:diva-128928 (URN)978-91-554-7852-0 (ISBN)
Public defence
2010-10-08, Room 1211, Polacksbacken, Lägerhyddsvägen 2F, Uppsala, 13:15 (English)
Opponent
Supervisors
Projects
eSSENCE
Available from: 2010-08-30 Created: 2010-08-03 Last updated: 2011-02-17Bibliographically approved

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Sabesan, ManivasakanRisch, Tore

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