扩展OGSA-DAI数据访问与集成框架的关键技术分析

基于OGSA-DAI数据访问模式,以网络服务方式提供对异构数据资源统一访问,更方便地满足特殊的数据源访问、集成.通过编写相应的Activity类操纵数据,创建服务器端Activity负责具体数据处理任务,创建客户端Activity 用于生成执行文档和执行数据转换任务,扩展OGSA-DAI以支持异构数据源的集成和访问.

Key techniques to extend data access and integration frame for OGSA-DAI

OGSA-DAI is a middleware that provides universal data access for heterogeneous data sources with network services.It unites access and control of scattered and heterogeneous data to one logic data source and shields the database driver,data formats and communication protocols of the heterogeneous systems for users.Thus,the heterogeneous data source may be accessed and controlled as a single logic source,making it more convenient to access and integrate the special data source.To extend OGSA-DAI to support heterogeneous data access and integration services,new activity classes were designed to manipulate the data.Server-side activities were created to process the data,while client-side activities were created to build execution documents and data conversion based on XML Schema.