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高度开放的计算环境使web服务系统面临各种不确定性.为了有效地配置计算资源以实现系统业务价值最大化,需要对不确定的概率服务组合系统需求进行建模.在LSC的基础上,提出一种基于三段式概率消息的需求描述语言p LSC,用于描述概率服务组合系统中随机场景描述的不确定的需求.从马尔可夫随机过程特性出发,提出随机变量与消息相结合的三段式概率消息概念,p LSC语言是一种基于三段式概率消息的需求描述语言,将三段式概率消息中随机变量对象化,通过随机变量对象消息交互序列直观表示随机场景描述的系统需求.文中给出了p LSC语言的图形表示方法,并展示了p LSCEditor编辑工具用于图形化编辑随机场景.
A highly open computing environment is facing various uncertainties in the web services system.In order to effectively configure computing resources to maximize the value of the system business, it is necessary to model the uncertain probability of service composition system.On the basis of LSC, This paper presents a demand description language p LSC based on three-stage probability message, which is used to describe the uncertain demand of stochastic scene description in the probabilistic service composition system.According to the characteristics of Markov random process, the paper proposes a combination of random variables and messages The concept of three-stage probability message, p LSC language is a kind of requirement description language based on three-stage probability message, which objectifies the random variables in the three-stage probability message and intuitively represents the system of random scene description through the random variable object message interaction sequence The paper presents a graphical representation of p LSC language and shows that p LSCEditor editing tools are used to graphically edit random scenes.