Design And Implementation Of Web System Dependability Evaluation Tool

With the rapid development of Internet technology and the support of the government,a new business model Internet plus born.This new business model put forward higher requirements for the security,reliability,safety,fault tolerance and maintainability of the Internet software,and the attributes of the software are collectively referred to the credibility of the software.Therefore,how to evaluate the credibility of Internet software has become an important issue to maintain the normal operation of the model Internet plus.Software credibility evaluation is a traditional research topic,credibility evaluation model is mainly used to reference theory of probability model,the object of evaluation is the stand-alone software in most cases,the credibility evaluation model for Internet software is not rich enough.In this paper,the evaluation methods and techniques of Internet software credibility are discussed,and the credibility evaluation model based on Web application system is proposed.This paper discusses the methods of obtaining credibility evidence,credibility evaluation model and Web system credibility evaluation case.The use of crawler technology to open source software credibility related evidence data acquisition,including software failure,maintenance,absence of reports and other data collection.This paper uses the method of subsection evaluation and random sampling to analyze and classify the credible evidence.According to the Web system reliability evaluation model and the key algorithm development tools,combined with the reliability evaluation of Firefox software problems,to further validate the availability of tool and the feasibility of the proposed model.At the same time,this paper analyzes and contrasts the cases and existing cases.The reliability evaluation put forward new ideas in the Internet software model of Web system,the mathematical definition of trust property,credibility and trust transfer probability.The dependencies between software components,the probability of software trustworthiness and trusted component transfer are given and as a certain supplement to the existing software reliability evaluation theory.