支持IP QoS服务质量机制的CORBA

IP QoS-Driven CORBA

0 引言 作为分布式计算的一个重要规范--CORBA[1],其主要目标是解决面向对象的异构应用之间的互操作问题,并提供了分布式计算所需的多项服务.ORB是CORBA平台的核心,用于屏蔽与底层平台有关的细节,使开发者可以集中精力去解决与应用相关的问题,而不必自己为创建分布式计算基础平台而操心.但是随着CORBA应用于分布式多媒体环境(media-rich)和分布式实时系统(mission-critical),端到端的QoS保证成为关键,服务中的带宽(Rate)、差错率(Loss)、延迟(Delay)和延迟抖动(Jitter)必须加以考虑,但是由于OMG在制订CORBA规范时,主要考虑的是互操作性,用以解决异种平台的协作问题,对于服务质量QoS的考虑较少,使得很难基于CORBA建立一个可实用的分布式多媒体环境和分布式实时系统.

With the development and deployment of QoS technology continuous media and real-time application, such as audio and video,are quickly becoming and integral part of distributed computing environments. Increasing demand to build a QoS-Dnven CORBA,which is a widely accepted distributed object platform,becom urgent. Firstly,this paper discusses a proposed IP QoS architecture and protocols supporting the Internet integrated services. Then a QoS-Driven CORBA is presented.