【作者】 孙锐；

【导师】 李登道；

【作者基本信息】 山东科技大学 ， 计算机应用技术， 2003， 硕士

【摘要】 本文主要针对COM组件模型中客户与组件间如何通信这个问题进行了深入分析与研究，两者间以接口的形式通信，其通信机制屏蔽了底层的网络通信协议，提供了一个应用级的通信平台，可以很好的完成客户与COM组件间的双向通信。 但在群组通信中，COM无法实现多个客户之间的直接通信。根据COM的可连接点机制，一个客户对服务器的通信内容可以转发给与服务器连接的其他客户，所以，本文引入会话空间的概念，在服务器中加入会话期对象和会话期管理对象，通过服务器中转实现同一会话空间中客户之间的多点通信。 另外，群组通信中往往面对的是更加复杂的多服务器系统。在多服务器系统中，COM通信虽然可以通过手工配置来设定远程服务器的位置，实现静态的负载平衡，但尚未实现服务器的动态负载平衡，这也大大的限制了COM的透明程度。本文通过在客户与服务器间增加调度器模块，构成三层客户／服务器体系结构，实现动态的负载平衡，同时也增强了COM的位置透明性。本文还提出了一种可行的负载平衡策略及平衡算法，并对系统的容错性进行了分析，给出了解决方法。 在COM群组通信的实现方面，综合考虑以上两个问题，初步设计了客户机、调度器和服务器中应实现的主要功能和接口调用。 本文的主要研究成果如下： (1)深入分析模拟了COM底层通信的实现原理与技术； (2)给出了群组通信模型，引入会话空间的概念，在服务器中加入会话期对象和会话期管理对象，实现了客户间的多点通信及管理； (3)探讨了多服务器系统中的动态负载平衡和容错性问题，设计增加了调度器模块，考虑了主要的负载平衡策略、算法及容错性的处理； (4)初步设计了实现多点通信时客户、调度器及服务器应支持的主要功能及接口调用，讨论了各接口之间的调用关系。更多还原

【Abstract】 The thesis deeply analyses and studies the issue of how to communication between COM component and its clients in COM model. Component and its clients is communicated by interface.COM mechanism shields its rock-bottom realization, provides a application communication platform, and realizes the two-way communication of component and its clients.But COM doesn’t accomplish the direct communication of many clients in multicast communication. According to connection point mechanism, the content that a client gives server may be transmitted to other clients connected by the server. The paper induces the concept of Session Space. Multicast communication in a session space is realized by server as agency.In addition, there is more complicated multi-server system in multicast communication. In multi-server system, COM may assign the locality of remote server, and realize static load balancing, but it still doesn’t realize dynamic load balancing and strict the degree of COM transparent. The paper adds scheduler between client and server, constitutes three layer of C/S framework. It realizes dynamic load balancing and increases the degree of COM transparent. This paper puts forward a feasible load balancing strategy and algorism, analyzes fault tolerance of the system and a resolve method is given.At the aspect of the realization of COM multicast communication, the paper considers above two problems and designs main functions and interfaces of client, scheduler and server.The main research results in this thesis are as follows:(1) Deeply analyzed the principle and technology of COM communication.(2) Put forward multicast communication model, introduced session space, added session object and session manager object into server, realizing many clients’ communication and management.(3) Discussed dynamic load balancing and fault tolerance, designed scheduler, consider main load balancing strategy, algorism and the process to fault tolerance.(4) Designed the main function and interface of client, scheduler and server, discussed call relation of interfaces.更多还原