NGG中异构数据的集成与协同工作

在国家地质调查应用网格环境中,数据集成除了实现异构数据源中数据检索,还应满足异构数据管理系统之间数据约束关系维护与协同工作的需求.针对这一需求,提出一种基于面向服务的体系结构(SOA,Service Oriented Architecture)的数据集成机制.将虚拟化的局部数据信息与全局统一的抽象数据视图相结合,形成层次化数据信息组织模型;通过该模型,维护异构数据之间的约束依赖关系,利用数据管理系统触发器与网络服务,满足数据管理系统的协同工作需求.基于研究成果的数据集成中间件NGG-DBMs(National Geology Grid-Data Base Management system)系统平稳运行于国家地质调查应用网格环境中. 

Heterogeneous data integration and coordination in national geology grid

In national geology grid(NGG) environment,applications are developed with distributed geologic data.To facilitate application,a uniform data integration framework should be provided.For geologic application's characteristics,the data integration systems should focus on maintaining dynamic data resource information,searching among heterogeneous data and coordinating constrain relations in the distributed environment.For the needs,a service oriented architecture(SOA) based mechanism for data resource integration was proposed.In the mechanism,a layered data information structure that was consisted by virtualized local data resource information and global data view for searching was implemented.Uncertainty of dynamic data resource was hidden by the structure through which application accessed data uniformly.Constrain relations between data that were maintained in the global data view were checked through triggers of local data base(DB) system and web services.Coordination among heterogeneous data base management system(DBMs) was realized.Based on the mechanism,a middleware named NGG-DBMs has been constructed and serves for NGG.