Abstract
Composition of web services has emerged as a fast growing field of research since an atomic service in its entirety is not capable to perform a specific task. Composition of web services is a process where a set of web services, heterogeneous in nature, are clubbed together in order to perform a specific task. Individually, Component web services may be performing well as far as Quality of Service (QoS) is concerned but the core issue is that while composing, do they satisfy Users requirements in terms of QoS? Computation of QoS while composing web services appears to be a big challenge. A lot of research work in this regard, has already been undertaken to come out with new, innovative and credible solutions for the same. This Paper presents a thorough review-study of different frameworks, architectures, methodologies and algorithms suggested by different researchers in their efforts to compute the overall QoS while composing web services. Moreover, Effectiveness of different methods in terms of QoS while composing is also presented.
Highlights
Web services are getting more popularity as far as distributed computing and e-business/ commerce are concerned
This Paper presents a thorough review-study of different frameworks, architectures, methodologies and algorithms suggested by different researchers in their efforts to compute the overall Quality of Service (QoS) while composing web services
Since area of scope of this paper is confined to automatic/ dynamic composition of web services, we are presenting here various processes involved in composition, clearly depicting them in the following diagram (Fig 1)
Summary
Web services are getting more popularity as far as distributed computing and e-business/ commerce are concerned. Composition is the process where prevailing composite web services or atomic web Services are clubbed together to perform a specific business operation. This composition/ integration can be done manually or automatically. Service requester initiates the process by making a service request specifying functional as well as nonfunctional constraints. Each group is having candidate web services with similar functionality attributes but differing in their QoS. We are studying various approaches and techniques adopted to perform composition of Web Services based on QoS, computing the overall QoS of the Composite web services called CQoS.
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