论文摘要
网络技术的飞速发展和构件化的软件模式带来了分布式构件技术的广泛应用,CORBA、DCOM、EJB 和 UNO 是当前流行的分布式构件技术,它们各自具有优点和不足之处。在面向对象的构件技术中,通过对接口的调用实现构件的互操作性,调用者与构件对象基于客户/服务器模型,调用者位于客户端,而构件对象位于服务器端。在调用过程中可以采用请求/应答和发布/订阅两种不同的传输模型。本文通过我们开发的 TH_CORE 构件平台对调用技术进行研究,TH_CORE是轻量级的构件平台,具有支持 SOAP 和 Cache 功能,能够进行自描述等特点。TH_CORE 的接口具有二重指针的内存结构。TH_CORE 在跨进程调用中通过Proxy 和 Stub 进行参数的列集散集和数据的传输。IChannel 是 TH_CORE 进行调用数据传输的接口,它提供了客户端和服务器端传输操作,并提供了 FIFO、TCP和 SOAP 三种不同的实现方式,这三种方式分别具有不同的性能和作用域。而后,本文根据可连接对象模型在 TH_CORE 上开发了事件机制。在可连接对象模型中,事件在构件端通过事件接口进行定义,由事件容器对事件接口进行管理和对事件进行触发,客户端通过接收器对象建立与服务端的连接。整个可连接对象模型具有可扩展的结构。本文中对可连接模型提出了优化,并在其上设计了 TH_CORE 事件模型。TH_CORE 事件模型中为每个事件设置时间属性,依据时间属性通过识别器判断事件之间的关联,从而实现复合事件的识别,并通过事件队列实现事件的优先级传输。TH_CORE 事件模型中还定义了基于XML 描述复合事件的方法。PURPLE 是建立在 TH_CORE 上具有反射式体系结构的中间件平台。本文中利用 TH_CORE 事件机制实现了 PURPLE 的环境监测系统,通过 Probe Container和 Info Container 完成对系统硬件环境的监测过程。其中 Probe Container 加载一组 Probe 完成环境信息的获取,并将信息传递给 Info Container,Info Container加载一组事件容器,依据环境信息通过事件容器完成对系统配置策略的改变。Probe Container 和 Info Container 具有可扩展性,能够实现动态重配置。论文的最后是工作总结和对进一步工作的展望。
论文目录
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