Abstract
In the present Web services scenario, user demands are complex in nature and cannot be answered by a single Web Service. Composite services need to be constructed to fulfill such demand. QoS is an important aspect of service composition. The overall QoS of the composite service may be decided by the QoS offered by the constituting component services. Therefore a complex service should be formed using component services with matching QoS values. In this paper, a method has been proposed to form complex service sets using component services with matching QoS values such that user’s cost requirement is also satisfied. Availability, response time and throughput are important QoS parameters. Very few number of sets are presented to the user in the form of a list such that the set with best QoS appears at the top. The proposed method thus is very useful for the user and enables him to avail the complex service with best QoS.
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