上下文感知的组合服务替换机制研究

发布时间：2018-09-06 07:53

【摘要】：服务替换即对组合服务中的失效部分或不能满足用户需求的部分进行有效地更换，此领域是近年来的研究热点问题之一。服务替换对组合服务的可靠执行和服务的透明执行都具有重要意义，而且，服务替换的研究对以用户体验为中心的软件服务体系也有着非常特殊的意义。特别地，随着用户需求的多样性和网络环境的日益复杂性，对信息服务系统的用户体验要求越来越高，组合服务的复杂程度也越来越高。在解决服务替换相关问题时，现有方法思想比较单一，多以当前失效服务为替换对象，由此产生的选择结果未必是在当前环境下最优的选择；目前提出的服务替换方法中，多数以被替换服务为匹配对象，得到的服务信息中存在冗余，不能适应日益复杂的组合服务替换需求；现有替换方法多注重服务功能上的相似，而对服务接口考虑的较少，方法的准确性有待提高。针对以上问题，本文从以下三个方面来开展工作。（1）为了提高服务替换的效率，提出从上下文感知的角度，确定服务成本决策因素，在此基础上，提出了一种替换对象的判断模型和替换对象决策方法(Decision Making Method forSubstitution Object, DMMSO)，进而确定替换对象；（2）为了减少被替换服务的冗余信息，提出以待替换服务的组合上下文为研究对象，基于已有的着色petri网服务工作流建模方法，提出服务的组合上下文信息采集算法(Composition Context Information Collection Algorithm,CCICA)，以服务的组合上下文为服务信息采集源；（3）为了提高替换方法的准确性，提出基于编辑距离的服务替换方法(Levenshtein Distance-Based Service Substitution Method,LDBSSM)，并将服务接口的依赖关系加入到了算法中。最后，本文设计和实现了一种上下文感知的组合服务替换机制仿真系统，通过实例介绍了系统的运行过程，验证了本文方法的实用性。而且，进一步的仿真实验表明本文提出的方法较好地提高了服务替换的效率，，减少了被替换服务的信息冗余，有效地提高了服务替换的准确性，具有更好的实用价值。
[Abstract]:Service replacement is one of the hot research topics in recent years, that is, the failure part of composite service or the part that can not meet the needs of users can be replaced effectively. Service replacement is of great significance to the reliable execution of composite services and the transparent execution of services. Moreover, the research of service replacement is of special significance to the software service system centered on user experience. In particular, with the diversity of user requirements and the increasing complexity of the network environment, the user experience of information service systems is becoming more and more demanding, and the complexity of composite services is becoming more and more high. In solving the problems related to service replacement, the existing methods have a single idea, and most of them take the current invalid service as the replacement object, and the resulting selection result is not necessarily the best choice in the current environment. Most of the services are replaced as matching objects, and there is redundancy in the service information, which can not adapt to the increasingly complex composite service replacement requirements. The existing replacement methods focus on the similarity of service functions, but less on the service interface. The accuracy of the method needs to be improved. In order to improve the efficiency of service replacement, we propose to determine the service cost decision factors from the perspective of context awareness. In order to reduce the redundant information of the replaced service, a decision model of the replacement object and the decision method of the replacement object (Decision Making Method forSubstitution Object, DMMSO), are proposed. (2) in order to reduce the redundant information of the service to be replaced, the composite context of the service to be replaced is proposed as the research object. Based on the existing modeling method of service workflow in colored petri net, a service composition context information collection algorithm (Composition Context Information Collection Algorithm,CCICA) is proposed, which takes the service composition context as the service information collection source. (3) in order to improve the accuracy of the replacement method, A service replacement method based on edit distance (Levenshtein Distance-Based Service Substitution Method,LDBSSM) is proposed, and the dependency of service interface is added to the algorithm. Finally, a context-aware simulation system of composite service replacement mechanism is designed and implemented. The running process of the system is introduced through an example, and the practicability of the proposed method is verified. Furthermore, further simulation experiments show that the proposed method can improve the efficiency of service replacement, reduce the information redundancy of the replaced service, and improve the accuracy of service replacement effectively, which has better practical value.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TP393.01

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