Contract-based Service Value Model And Integrated Modeling Analysis Method

With the fast growth of service computing, cloud services and other emerging information technologies, services on the market are becoming more and more diversified. At the same time, customers’ needs and expectations are becoming more and more complex and personalized. When broker composes multiple atom services into a composite service, the composite service also needs its own contract. The traditional customer value satisfaction only depends on the Qo S, so customers cannot declare a more comprehensive value expectation. Most of Qo S aware service composition have nothing to do with service contracts and service value, and it is necessary to study the service composition base d on the contract and the value due to the limitation of Qo S and the importance of value in service.In view of the above problems, we extend the contract model of the atomic service to the contract model of the composite service. We propose the value expectation model and value measurement method based on contract. And we propose the Skyline service set discovery method based on contract. And then we put forward contract based and value oriented service composition. Finally, we present the service value integration modeling tool based on contract. The main research contents are as follows:(1) Service contract model for composite services: The recent research of service contract only consider the atomic service, and we propose the service contract models for composite services. And we propose aggregation rules and generation algorithms for composite contract.(2) Integrated modeling method of service contract and service v alue: Both the expectation and measurement of value should be combined with the two aspects of Qo S and service contract. So we propose the value expectation model based on contract, and an extended model of customer value expectation model under asymmetric information. And then we propose the value measurement method based on contract.(3) The contract based and value oriented service composition: The present research of service composition is mostly based on Qo S. This paper integrats the service contract model and value model into the service composition algorithm based on artificial bee colony and design the various stages of the algorithm in detail. We use the Skyline idea based on customers’ individual expectations to pre treat the candidate service set, we analyse the algorithm through experiments.(4) Service value integration modeling tool based on contract : In order to facilitate the customer and broker to carry out the value expectation, measurement and service composition, we design and develop the tool. The tool includes: service information configuration, value expectation, added value expectation, generating Skyline service set, and service composition.This paper takes the service contract as the research foundation to propose the service value declaration model and value measurement method based on contract. And we propose the Skyline service set discovery method based on contract. Then we put forward contract based and value oriented service composition. At last, we present the service value integration modeling tool based on contract.