Web服务冲突动态检测和解决方法的研究
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摘要
特征交互问题是Bellcore在电信领域提出的一个问题,它已成为新型电信业务开发的重要障碍之一。然而,这一现象并非局限于电信领域,在电信领域之外的一些软件系统中也发现了类似的问题。在Web服务领域,由于单个服务无法满足日益增长的用户需求,服务组合技术应运而生,通过集成多个服务的方式解决此问题。但它同时也带来类似于电信领域特征交互的问题,即Web服务冲突问题。虽然此问题在2000年即被提出,但其并未得到足够的重视。目前相关研究工作相对缺乏,且存在一些不足。例如:检测方法的应用范围狭窄,无法应用于动态场景等。
     根据此问题的研究趋势,本论文以Web服务冲突的在线检测和解决为主要研究点,在借鉴免疫系统的优良特性和相关免疫原理的基础上,对如何全面统一地动态管理Web服务冲突现象进行了深入的研究。
     论文中对研究过程中取得的主要成果进行了详细阐述。相关成果可归纳如下:
     1.提出一种基于免疫原理的Web服务冲突动态检测系统WSFIDS
     本论文针对Web服务冲突领域研究中存在的问题,借鉴免疫系统的相关思想,提出了一种Web服务冲突检测系统WSFIDS。该系统采用多层防御的机制,克服了分类研究方式的局限性,能够以一种统一的方式进行Web服务冲突的动态检测。该系统通过借鉴抗原提呈、抗原识别、协同刺激和免疫记忆等多种免疫原理,学习免疫系统的优良特性,不但可以有效地检测已知服务冲突现象,对未知服务冲突现象也具有一定的检测效果。
     2.提出一种Web服务冲突的形式化描述框架
     Web服务冲突的形式化描述有助于研究Web服务冲突的本质特征,把握Web服务冲突检测所需信息,从而提出高效的Web服务冲突检测方法。论文中通过实例研究的方式,提出一种Web服务冲突形式化描述框架,并将其作为WSFIDS系统实现检测功能的重要基础之一。
     3.提出一种基于克隆选择原理的Web服务冲突检测规则优化算法
     Web服务冲突检测规则是本文提出的Web服务冲突动态检测方法实现时必不可少的部分。论文中借鉴克隆选择原理,根据检测方法的仿真实验结果,提出一种Web服务冲突检测规则优化算法,可以有效地缩短本文提出检测方法的检测时间,从而达到提高检测效率的目的。
     4.提出一种Web服务冲突动态解决方法
     解决是Web服务冲突检测的根本目的。论文通过对免疫系统相关机制的分析,简单地讨论了基于免疫学的Web服务冲突解决机制;并针对由于原子服务失效引发的服务冲突现象,提出一种基于事务回滚机制的Web服务冲突动态解决方法。
Feature interaction problem, firstly coined in the telecom by Bellcore, is one of the important obstacles for the development of new services. But this phenomenon is not unique to the telecom. It also occurs in some software system beyond telecom. In the Web services area, service composition technique is introduced to integrate several Web services to meet the increasing user demand that a single service can not satisfy. But it also brings the potential of the problem resembling the feature interaction in the telecommunication area. The problem is defined as Web Services Feature Interactions (WSFI) problem. Although this problem was raised in May 2000, it has not received enough attention. The related work is limited, and there exists some deficiencies. For example, the application fields of current detection methods are limited and they can not apply to the online scenarios.
     According to the research trends in this area, the thesis is focused on the online detection and resolution of WSFI problem, and makes an in-depth study on how to manage the problem in a uniform and online manner by taking inspirations from the perfect characteristics of immune system and related immune principles.
     The main contributions of our work are discussed in this thesis in detail, and they are summarized as follows:
     1. An immune-inspired online detection system for WSFI problem (WSFIDS) is presented.
     Aiming to overcome the drawbacks of current research work in the Web Services Feature Interactions area, an immune-inspired online detection system for WSFI problem (WSFIDS) is presented by drawing inspirations from the immune theory. It employs the multi-layer defense mechanism, and overcomes the limitation of classification-based approach so as to detect the WSFI phenomena in a uniform and online manner. With the application of some immune principles including antigen presentation, antigen recognition, co-stimulation, immune memory and so on, the system can effectively detect not only the known WSFI, but also the unknown ones.
     2. A formal description framework for WSFI is proposed.
     Formal description of WSFI phenomena conduces to the further study on the essence of WSFI problem, and helps grasp what is essential for WSFI detection leading to propose an effective detection method. A formal description framework for WSFI is proposed by case study in this thesis, and used as one of the important bases in the WSFIDS system.
     3. A clone selection-based optimization algorithm for WSFI detection rules is presented.
     WSFI detection rules play an indispensable role in the implementation of WSFI detection method. Inspired by the clone selection theory, a clone selection-based optimization algorithm for WSFI detection rules is presented according to the experimental results of our detection method. It can effectively decrease the detection time so as to increase the detection efficiency.
     4. An online resolution method for WSFI is proposed.
     The aim of WSFI detection is resolution. By analyzing the related mechanism of immune system, the immunity-based WSFI resolution mechanism is briefly discussed in this thesis. And a transaction rollback-based WSFI resolution method is proposed to resolve the specific type of WSFI resulting from the atomic service invalidity at runtime.
引文
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