云计算中的按需服务

云计算为计算系统软硬件基础设施的设计和部署及用户对信息系统的规划和使用提供了一种新的模式。方便、灵活的方式,高效、价格低廉和保障质量的服务是云计算模式的典型特征。文章从服务的角度提出一个云计算中按需服务系统的架构,并基于架构探讨云计算中的按需服务问题,包括分布式服务资源的组织管理与监控、情境感知的按需服务建模、大规模网络环境中的按需服务组合,以及基于复杂系统理论的服务系统。文章还以地球空间信息系统中的连续运行参考站网为例,用云计算的视点分析了其系统的体系结构,并对其服务中出现的问题进行了探讨。

On-Demand Service in Cloud Computing

Cloud computing provides a new model not only of hardware and software infrastructure design and deployment,but also of user planning and usage of information systems.Flexible,convenient,efficient,inexpensive,and high quality service are typical features of the cloud computing model.This paper analyzes on-demand system architecture in cloud computing from the perspective of service,and explores on-demand service issues.These issues include managing and monitoring of distributed service resources,context-aware on-demand service modeling,on-demand automated service composition in large-scale networks,and service system analysis based on complex systems.Taking the continuously operating reference station network of a geo-spatial information system as an example,this paper examines its architecture from the perspective of cloud computing and also explores some fundamental questions about its service.