An Efficient WS-QoS Broker Based Architecture for Web Services Selection

Abstract

Web Service selection is a key component in service-oriented computing. Service-oriented Architectures follow the find-bindexecute paradigm in which service providers register their services in public or private registries, which clients use to locate web services. The QoS based web service selection mechanisms plays an essential role in service-oriented architectures, because most of the applications want to use services that accurately meet their requirements. Currently, the UDDI catalogue supports only primitive matching mechanisms and provides no control over the quality of registered services. We propose a QoS broker based architecture for dynamic web service selection which facilitates the clients to specify the non-functional requirements like QoS along with functional requirements. The paper presents an efficient mechanism for finding the most suitable web service according to the consumer's requirements.

An Extended Broker Centric Dynamic Web Service Discovery and Composition Framework

“…A dynamic web service discovery architecture is presented that contains an extended UDDI to store the QoS information. It uses t-model data structure and WS-QoS broker to facilitate the web service discovery dynamically [10][11][12][13][14][15]. The sub-components of WS-QoS broker are service publisher, verifier and certifier, service selector and Web Service Storage (WSS).…”

“…The sub-components of WS-QoS broker are service publisher, verifier and certifier, service selector and Web Service Storage (WSS). The broker is a web service through which the UDDI is accessed [11][12][13]. Its sub-components are service publisher, verifier and certifier, retrieval agent, quality analyzer and WSS.…”

“…Thus, the overall time complexity for the proposed algorithm is O(n2). Figure 17 shows the performance comparison of existing and proposed broker based architecture on the basis of response time for varying number of complex tasks [2][9] [11][12][13][14][15][34] [38][39][40][41]. In Figure 17, it is seen that the time complexity of existing approaches are mn, which is very large when the number of service increases.…”

QoS Broker based Architecture for Dynamic Web Service Discovery and Composition

“…Multi-agents are introduced in this architecture and thus, three multi agents are used; namely, response agent, certification agent and query agent to perform the interaction with the UDDI. A dynamic web service discovery architecture is presented that contains an extended UDDI to store the QoS information using t-model data structure and WS-QoS broker to facilitate the web service discovery at runtime [10][11][12][13][14][15].The sub-components of WS-QoS broker are service publisher, verifier and certifier, service selector and Web Service Storage (WSS). The broker is also a web service through which the UDDI is accessed [11][12][13].…”

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

“…Traditional service discovery model can be extended with a new role called a certifier which verifies the advertised QoS of a web service before its registration with the existing three roles of web service (Rajendran et al, 2010c). The consumer can also verify the advertised QoS with the certifier before binding to a web service.…”