Extended Service Registry for Efficient Web Service Search

Service registries and web service engines are the main approaches for discovering web services. Current service directories are mainly based on Universal Description, Discovery and Integration (UDDI), which is an industry standard for service registries, developed to solve the web service search problem. However, UDDI offers limited search functionalities which may return a huge number of irrelevant services. Often consumers may be unaware of precise keywords to retrieve the required services satisfactorily and may be looking for services capable of providing certain outputs. In this paper, we propose a new system called Extended Service Registry (ESR) for extended and efficient service search using an object relational database. The functional requirements are provided by the user as a set of input parameters provided for and output parameters desired from the web service. The experimental results demonstrate the efficiency of service search in our Extended Service Registry (ESR) and the variety of user queries supported

Bi-Level Selection Model for Web Services Search

Service registries and web service engines are the main approaches for discovering web services. Current service directories are mainly based on Universal Description, Discovery and Integration (UDDI), which is an industry standard for service registries, developed to solve the web service search problem. However, UDDI offers limited search functionalities which may return a huge number of irrelevant services. Another critical challenge in web service search and composition is the selection of web services, to be executed or to be composed, from the pool of matching services. Most of the current service selection proposals apply a weighted sum model (WSM) as an evaluation method for selection of services with the same functionality. In this paper, we propose a Bi-level service selection approach that selects the most appropriate web services from the pool of matching services that considers both the functional and non-functional requirements for service selection. The functional requirements are provided by the user as a set of input parameters provided for and output parameters desired from the web service. The user also provides a set of desired QoS values and the order of their preference for selection. The experimental results demonstrate the efficiency of service search in our bi-level model and the variety of user queries supported

Uma abordagem para busca por web services com requisitos de QoS

Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Ciência da Computação.O objetivo dos Web Services é resolver problemas de interoperabilidade entre aplicações da Web. Um dos principais problemas recorrente aos Web Services atualmente está no fato de o cliente não conseguir a QoS (quality of service) necessária para receber ou acessar determinado serviço ou aplicação. Esta dissertação apresenta uma especificação para obtenção de QoS entre Web Services. Esta especificação utiliza um broker como módulo intermediário entre cliente, servidor e UDDI, coletando informações de QoS e tomando decisões para que o cliente consiga a qualidade de serviço desejada. Para a definição dos parâmetros de QoS forem criados Esquemas XML. São apresentados o Esquema XML e um estudo de caso para a validação da arquitetura

Client-side Selection Of Replicated Web Services: An Empirical Assessment

Replicating web services over physically distributed servers can offer client applications a number of QoS benefits, including higher availability and reduced response time. However, selecting the "best" service replica to invoke at the client-side is not a trivial task, as this requires taking into account factors such as local and external network conditions, and the servers' current workload. This paper presents an empirical assessment of five representative client-side service selection policies for accessing replicated web services. The assessment measured the response time obtained with each of the five policies, at two different client configurations, when accessing a world-wide replicated service with four replicas located in three continents. The assessment's results were analyzed both quantitatively and qualitatively. In essence, the results show that, in addition to the QoS levels provided by the external network and the remote servers, characteristics of the local client environment can have a significant impact on the performance of some of the policies investigated. In this regard, the paper presents a set of guidelines to help application developers in identifying a server selection policy that best suits a particular service replication scenario. © 2007 Elsevier Inc. All rights reserved.81813461363Amini, L., Shaikh, A., Schulzrinne, H., Modeling redirection in geographically diverse server sets (2003) Proceedings of the 12th International World Wide Web Conference (WWW 2003), pp. 472-481. , ACM Press, Budapest, HungaryApache, 2006. AXIS Version 1.4. Available at http://ws.apache.org/axis/ (accessed 28.02.07)Cauldwell, P., Chawla, R., Chopra, V., (2001) Professional XML Web Services, , Wrox Press, Birminghan, USACosta, L.A.G., Pires, P.F., Mattoso, M., Automatic composition of web services with contingency plans (2004) Proceedings of the IEEE International Conference on Web Services (ICWS'04), , IEEE Computer Society Press, Washington, DC, USADamani, O., Chung, Y., Kintala, C., Wan, Y., ONE-IP: techniques for hosting a service on a cluster of machines (1997) Proceedings of the 6th International World Wide Web Conference (WWW'97), pp. 1019-1027. , Elsevier Science Publishers, Ltd., California, USADykes, S.G., Robbins, K.A., Jeffery, C.L., Empirical evaluation of client-side server selection algorithms (2000) Proceedings of the 19th Annual Joint Conference of the IEEE Computer and Communications Societies (INFOCOM 2000), 3, pp. 1361-1370. , Tel Aviv, IsraelHanna, M.K., Natajaran, N., Levine, N.B., November 2001. Evaluation of a novel two-step server selection metric. In: Proceedings of the 9th IEEE International Conference on Network Protocols (ICNP'01). California, USA, p. 290Hu, J., Guo, C., Wang, H., Zou, P., Quality driven web services selection (2005) Proceedings of the IEEE International Conference on e-Business Engineering (ICEBE'04), pp. 681-688. , IEEE Computer Society PressKeidl, M., Kemper, A., A framework for context-aware adaptable web services (2004) Lecture Notes in Computer Science, 2992, pp. 826-829. , Proceedings of the 9th International Conference on Extending Database Technology (EDBT 2004), SpringerLiu, Y., Ngu, A.H.H., Zeng, L., QoS computation and policing in dynamic web service selection (2004) Proceedings of the 13th International World Wide Web Conference (WWW'04), pp. 66-73. , ACM Press, New York, NY, USAMakris, C., Panagis, Y., Sakkopoulos, E., Tsakalidis, A., Efficient and adaptive discovery techniques of web services handling large data sets (2006) Journal of Systems and Software, 79 (4), pp. 480-495Menascé, D., QoS issues in web services (2002) IEEE Internet Computing, 6 (2), pp. 72-75Mendonça, N.C., Silva, J.A.F., An empirical evaluation of client-side server selection policies for accessing replicated web services (2005) Proceedings of the 20th Annual ACM Symposium on Applied Computing (SAC 2005), Special Track on Web Technologies and Applications, pp. 1704-1708. , ACM Press, Santa Fé, New Mexico, USAMicrosoft, 2006. NET Framework Version 3.0. Available at http://www.microsoft.com/net/ (accessed 28.02.07)OASIS, 2002. Universal Description, Discovery e Integration (UDDI) Version 2.0. Available at http://www.oasis-open.org/committees/uddi-spec/doc/tcspecs.htm#uddiv2 (accessed 28.02.07)Ouzzani, M., Bouguettaya, A., Efficient access to web services (2004) IEEE Internet Computing, 8 (2), pp. 34-44Padovitz, A., Krishnaswamy, S., Loke, S.W., July 2003. Towards efficient and smart selection of web services. In: Proceedings of the Second International Joint Conference on Autonomous Agents and Multi-agent Systems (AAMAS 2003), Workshop on Web Services and Agent-based Engineering (WSABE). Melbourne, AustraliaPapazoglou, M.P., Georgakopoulos, D., Service-oriented computing: introduction (2003) Communications of the ACM, 46 (10), pp. 25-28Ran, S., A model for web services discovery with QoS (2003) ACM SIGecom Exchanges, 4 (1), pp. 1-10Rodriguez, P., Biersack, E.W., Dynamic parallel access to replicated content in the internet (2002) IEEE/ACM Transactions on Networking, 10 (4), pp. 455-465Salas, J., Pérez-Sorrosal, F., Patiño-Martínez, M., Jiménez-Peris, R., WS-Replication: a framework for highly available web services (2006) Proceedings of the Fifteenth International World Wide Web Conference (WWW 2006), pp. 357-366. , ACM Press, Edinburgh, ScotlandSayal, M., Breitbart, Y., Scheuermann, P., Vingralek, R., Selection algorithms for replicated web servers (1998) ACM SIGMETRICS Performance Evaluation Review, 26 (3), pp. 44-50Serhani, M.A., Dssouli, R., Hafid, A., Sahraoui, H., A QoS broker based architecture for efficient web services selection (2005) Proceedings of the IEEE International Conference on Web Services (ICWS'05), pp. 113-120. , IEEE Computer Society PressSUN, 2006. Java Web Services Developer Pack (JWSDP) Version 2.0. Available at http://java.sun.com/webservices/downloads/webservicespack.html (accessed 28.02.07)Tian, M., Gramm, A., Ritter, H., Schiller, J., Efficient selection and monitoring of QoS-aware web services with the WS-QoS Framework (2004) Proceedings of the IEEE/WIC/ACM International Conference on Web Intelligence (WI'04), pp. 152-158. , IEEE Computer Society PressW3C, 2001. Web Services Definition Language (WSDL) Version 1.1, W3C Note 15. Available at http://www.w3.org/TR/wsdl (accessed 28.02.07)W3C, 2003. Simple Object Access Protocol (SOAP) Version 1.2, W3C Note 08. Available at http://www.w3.org/TR/SOAP/ (accessed 28.02.07)Yoshikawa, C., Chun, B., Eastham, P., Vahdat, A., Anderson, T., Culler, D., 1997. Using Smart Clients to Build Scalable Services. In: Proceedings of the USENIX Annual Technical Conference. Anaheim, California, USAYu, T., Lin, K.-J., A broker-based framework for QoS-aware web service composition (2005) Proceedings of the IEEE International Conference on E-Technology, E-Commerce and E-Service (EEE'05), pp. 22-29. , IEEE Computer Society PressYu, T., Lin, K.-J., Service selection algorithms for web services with end-to-end QoS constraints (2005) Journal of Information Systems and E-Business Management, 3 (2), pp. 103-126Zhou, C., Chia, L.-T., Lee, B.-S., QoS-aware and federated enhancement for UDDI (2004) International Journal of Web Services Research, 1 (2), pp. 58-85Zhuge, H., Liu, J., Flexible retrieval of web services (2004) Journal of Systems and Software, 70 (1-2), pp. 107-11