Presence-pattern aware Service Selection and Composition in a Smart Space
Service composition provides supports for automatic construction of required services on the y from component services provided by di erent providers.In a smart space,as new providers may come in and existing ones may leave from time to time,the collection of available component services may change dynamically,resulting in broken compositions.Automatic reselection or recomposition mechanisms can be applied to x broken compositions.However,they may introduce extra e orts and time and there are applications requiring (composed)services to be continuously available (at least) during a period of time,otherwise the applications would break down.Both the situations a ect users experience.If we could know how long each component service would be continuously available,we could optimize the composition process by reducing the frequency of broken compositions.In this paper we propose a scheme to achieve the goal.It utilizes presence-patterns of providers to estimate how long a component service may continuously available and it always selects the most continuously available composition that matches requirements.Simulations are carried out to show how and how well the presence-patterns based scheme work.
service composition pervasive computing smart space presence pattern
Jun MA Xianping TAO Jian LV
State Key Laboratory for Novel Software TechnologyNanjing University NO. 22 Han Kou Road,Nanjing,China 210093
国际会议
长沙
英文
49-56
2013-10-23（万方平台首次上网日期，不代表论文的发表时间）