Abstract
Selecting the most relevant Web Service according to a client requirement is an onerous task, as innumerous number of functionally same Web Services(WS) are listed in UDDI registry. WS are functionally same but their Quality and performance varies as per service providers. A web Service Selection Process involves two major points: Recommending the pertinent Web Service and avoiding unjustifiable web service. The deficiency in keyword based searching is that it doesn’t handle the client request accurately as keyword may have ambiguous meaning on different scenarios. UDDI and search engines all are based on keyword search, which are lagging behind on pertinent Web service selection. So the search mechanism must be incorporated with the Semantic behavior of Web Services. In order to strengthen this approach, the proposed model is incorporated with Quality of Services (QoS) based Ranking of semantic web services. This paper focuses on various concepts of Quality of Service associated with web services. Various QoS parameters like performance, availability, reliability and stability etc. are formalized in order to enhance the pertinence of web service selection. A QoS mediator agent based Web Service Selection Model is proposed where QoS Consultant acts as a Mediator Agent between clients and service providers. Model suggests user’s preferences on QoS parameter selection. The proposed model helps to select pertinent Web Service as per user’s requirement and reduce the human effort.. Further process of adding ontology with semantic web services is also illustrated here.
Highlights
Web Services [1] assists in providing solutions for distributed business processes and applications which are accessible via the Internet
User can specify any Quality of Services (QoS) parameter which should get the preference but in the absence of user’s input, over all RankQoS based on weighted sum of specified QoS parameters is considered
In order to enhance efficiency of Web Service selection based on QoS Ranking, this model presents mediator Agent based approach for QoS based Web Service selection
Summary
Web Services [1] assists in providing solutions for distributed business processes and applications which are accessible via the Internet. We have to ad-hoc decision to choose a WS It is just a matter of chance that we select a relevant WS to perform our work on Web. So we can say that above mentioned goals of SOA, are partially executed as WS are described and listed in public registries but there is no means to choose the best from the set of services offering the same functionality. A consumer is forced to make an ad -hoc decision of choosing a service from multiple services offered for the same functionality In such scenario Quality of Services (QoS) assist in ranking the WS and selecting the best WS from a list of candidate web service having similar functionality based on their QoS descriptions, in response to a service request made by the user.
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