Service composition method based on reliability prediction combined with QoS

A service composition and reliability technology, applied in the field of service composition, which can solve the problems of few studies on reliability changes and no specific composition method yet.

Active Publication Date: 2014-02-12
SOUTHEAST UNIV
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Problems solved by technology

[0005] At present, the research on reliability change mainly focuses on reliability prediction, and there are very few studies considering reliability change in the combination process, and in the existing research, the combination of QoS prediction and combination process is only in the conceptual model stage, and there is no one. A specific combination method that not only considers the satisfaction of QoS but also pays attention to the dynamic changes of QoS attributes

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  • Service composition method based on reliability prediction combined with QoS
  • Service composition method based on reliability prediction combined with QoS
  • Service composition method based on reliability prediction combined with QoS

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Embodiment Construction

[0036] The present invention is a process of selecting the optimal combination scheme among n groups of services with the same functionality but different QoS attributes. Questions such as figure 1 As shown, assuming that the system has successfully modeled the user's demand, a set of given combined demand CS is obtained request ={S 1 ,...,S n}, each requirement module has a set of candidate service sets S that satisfy its functional properties i ={s i1 ,s i2 ...,s ir}. According to the n tasks in the workflow, how to choose among n groups of service sets that meet its functions, so that it can not only meet the user's QoS requirements, but also ensure the reliability of the combination scheme. Table 1 shows the symbols used in the present invention and their meanings.

[0037]

[0038] Table 1

[0039] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0040] 1) Globally decompose the QoS const...

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Abstract

The invention discloses a service composition method based on reliability prediction combined with QoS. The service composition method includes the steps that according to QoS constraint of users, local selection is carried out on services, the global QoS constraint is divided into local constraint, then local optimal entity services are selected in each service assembly, and finally predication is carried out on reliability of the services with optimal QoS attributes and the predication result is used as a decisive factor for selection of a final combination scheme. According to the service composition method, the current QoS satisfaction conditions of the services are considered, the reliability change conditions within a period of time in the future are also considered, then the weightiness relationship between the current QoS satisfaction conditions and the reliability change conditions can be determined according to user preference, so that the compromise of the selected services is achieved between the current QoS constraint and future reliability, and an efficient and reliable system can be obtained.

Description

technical field [0001] The invention belongs to the field of computers and relates to a service combination method. Background technique [0002] The technology of service-oriented computing (SOC), the development of new software and services using existing services, has received significant attention and is widely used in business, government, and other fields. However, since different services are implemented by different technologies, deployed on different platforms, and released using different communication links, the introduction of Quality of Service (QoS) is used to distinguish these services with similar functions and different performances. At present, there are more and more services with similar functions on the Internet, and users often pay more attention to these non-functional attributes (that is, QoS). Therefore, service composition based on QoS awareness has gradually become a hot research field in the field of service computing. [0003] The goal of QoS-a...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/04
Inventor 王红兵孙海霞
Owner SOUTHEAST UNIV
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