Optimization method for QoS (Quality of Servie)-based trusted Web service composition

Abstract

The invention discloses an optimization method for a QoS (Quality of Servie)-based trusted Web service composition. The method comprises the following steps: firstly, evaluating the credibility of the services by analyzing a historical behavior of the services, so as to remove bad services that do not meet the requirement, and obtain the QoS-based trusted Web service as an alternative service for the global optimization of the subsequent service composition; and then using an improved multi-objective Cuckoo search algorithm to realize the multi-objective optimization of the Web service composition, so as to improve the optimization efficiency of the service composition, and finally obtain a composite service that meets the user need and ensures the credibility of the service.

Description

technical field [0001] The invention relates to the field of computer network services, in particular to a QoS-based trusted Web service combination optimization method. Background technique [0002] With the rapid development of computer technology, Web services are increasing and are widely used in various fields. However, although the increasing number of Web services can provide more and richer functions, the functions of a single Web service are limited after all, and obviously cannot meet the complex needs of users. In order to solve this problem, a large number of researches on Web service composition technology have sprung up in academia. The so-called service composition refers to the flexible and dynamic combination of several Web services with different functions based on functional or non-functional attributes into a whole, so that it can meet the complex application requests of various users and realize the value-added of services. [0003] At present, a large...

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Problems solved by technology

[0004] However, in real life, because the network environment in which the service is located is not fixed, but is in dynamic change all the time, the high QoS obtained according to the traditional service selection method cannot guarantee the quality of the service. credibility

There are generally two reasons for the low credibility of Web services: on the one hand, with the change of the dynamic and open Internet environment, the QoS attributes of the service are also changing; This will lead to fraudulent behavior of some service providers, that is, the performance of each attribute of QoS published by the service provider does not match the level actually obtained by the user. users make false evaluations and the existence of some false services, etc.

The above two reasons cause the QoS attribute value released by the service provider to be different from the real QoS attribute value obtained by the user from UDDI (Universal Discovery, Description, and Integration). It involves the issue of QoS credibility. These factors will inevitably lead to the fact that the final combined service cannot really meet the needs of users, and it is difficult for users to obtain truly high-quality and credible combined services.

One is; the other is that in a dynamic and open network environment, fraudulent behavior is inevitable

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