A Quality of Service Broker Based Process Model for Dynamic Web Service Composition

Abstract

Problem statement: With fast spreading of web services technology over the Internet, the quality aspects of a web service has received significant attention to the practitioners. The quality of web service includes both functional and nonfunctional details. In order to provide the correct and meaningful information to web service consumer, sometimes there is a need to compose existing web services in order to create new web service. Approach: We have proposed a Quality of Service (QoS) broker based process model for Dynamic Web Service Composition (DWSC). The QoS broker in the proposed model is responsible for web service collection, selection, optimization and composition based on the service consumer's requirements. It also verifies and certifies the functional and QoS specifications provided by service provider at the time of web service registration before publishing it in Universal Description, Discovery and Integration (UDDI) registry. The detailed working of QoS broker is also presented in the study with functionality of each component. We will also discuss the process flowchart for new web service registration and web service composition at runtime. Results: The proposed QoS broker based model for dynamic web service composition solves the problems associated with quality of web service. It also prevents the central repository from malicious service provider to publish wrong information. Conclusion: The QoS broker-based process model for dynamic web service composition guarantees the quality of delivered service to web service consumers and improve the efficiency of composition.

Quality of Experience: What End-Users Say about Web Services?

“…As shown in equation (5), the precision is the ratio of the total number of QoE attributes correctly extracted by our approach to the total number of QoE attributes. Recall is the ratio of the total number of QoE attributes correctly extracted by our approach to the total number of QoE attributes existed in the reviews as shown in equation (6). However, to successfully calculate the precision and recall we need an oracle covering the relevant QoE attributes that are required by equation (5) and (6).…”

“…QoS-based service selection approaches [1,2,3,6 and 16] focus on proposing comprehensive pre-defined QoS languages to describe service requests and offers, or implements a selection algorithm to achieve an optimized composition. However, the process of obtaining QoS information is largely overlooked.…”

Permutation of Httpi and HTTPS in Web Services Against Attacks for Security Enhancement

“…Once the above aspect is obtainable to reduce in a business organization the QoS metrics directly disturbing business. In his study mainly concentrated time, cost and reliability, for implementing QoS he or author developed SWR algorithm (Rathore and Suman, 2011).…”

A Framework to Magnitude the Performance and Behavior of Web Services Using Ontology

“…A final test report consisting of test and analysis results will be given back to the test requestor, based on which he can decide to consume the service or not. Hong and Zhang (2012); Yusof et al (2010); Kannammal et al (2006); Rathore and Suman (2011);Palanikkumar and Kousalya (2012) Salva (2011) and Nabiollahi et al (2011) presents a archetype execution of the framework in semantic WS and exhibits the feasibility of the framework by running examples of building a testing tool as a test service, embryonic a service for test executions of a WS and composing contemporary test services for more complicated testing chores. Experimental evaluation of the context has also demonstrated its scalability.…”