Abstract
In current business scenario the business processes of enterprises are service oriented. The services of various applications are advertised in service registry using Web Service Description Language description for service selection and composition. Service composition process integrates services based on Business Process Execution Language description of composite service and executed by the orchestration coordinator. As all compliant services description are included in the description, the service selection and execution consumes more time users need select the service form set of complaint services. This study proposes an adaptive service composition methodology over extended web service Quality Aware Service Integration architecture (QASI). The proposed service composition methodology reads the composite service description and constructs a composition tree. In each service node of composition tree a service is replaced by one that satisfies functional and QoS requirement. During execution of composite service or binding of service, the parameters like server maximum capacity, current load on server and expected time for completing current load for service at each level of composition tree are analyzed. An alternative service will be allocated at particular level to improve the overall response time of composite service. The QASI architecture provides a repository to store composition tree as symbolic notations to ensure repeatability. Experimental results indicates selection of best service and better response time by proposed methodology using QASI architecture compared to contemporary web service composition methodology using static BPEL description.
Highlights
Service Oriented Computing (SOC) is inevitable in business processes with ever changing requirements
The process of service composition requires an effective method to facilitate quick and simple composition of services and remains as a key challenge to realize the full potential of services
This study proposes an adaptive QoS aware service composition methodology over extended web service
Summary
Service Oriented Computing (SOC) is inevitable in business processes with ever changing requirements. To accomplish business process requirements, it is required to combine various individual services and their sequence of execution defined. Methodologies select the service from service registry based on user functional and QoS requirement. The process of service composition requires an effective method to facilitate quick and simple composition of services and remains as a key challenge to realize the full potential of services. To improve the quality of composite service a better alternative is discovered from service registry using QoS parameters and this replaces the existing service. QoS of composite service: The service registry load on server and execution time for completion of contains a number of services with same functionality. Ca/~qmahmoud/qws/dataset/) for service discovery to select best service based on QoS parameter using multi utility ranking function and found that it automatically discovers the best quality alternative from the compliant services The proposed system is experimented with benchmark web service dataset (http://www.uoguelph. ca/~qmahmoud/qws/dataset/) for service discovery to select best service based on QoS parameter using multi utility ranking function and found that it automatically discovers the best quality alternative from the compliant services
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