复制式协同设计环境中基于地址空间转换的关联操作一致性维护策略研究  

Consistency Maintenance of Reference Operations Based on Address Space Transformation Strategy in Replicated Collaborative Design Environments

作　　者：高丽萍[1] 

机构地区：[1]上海理工大学光电信息与计算机工程学院,上海200093

出　　处：《小型微型计算机系统》2011年第4期599-605,共7页Journal of Chinese Computer Systems

基　　金：上海理工大学人才引进启动基金项目(1D-09-302-012)资助;上海市教委晨光计划项目(10CG49)资助;光电学院创新基金建设项目(GDCX-T-102)资助

摘　　要：在复制式架构的二维协同设计系统中,地址空间转换算法可用来实现共享文档的一致性维护.然而,该算法无法直接处理关联操作,而是采用先分解后执行的方式进行,在操作分解执行过程中,远程并发操作的存在可能会导致关联操作所依赖的实体属性发生改变,从而使关联操作丢失被参照实体与参照实体之间的关联关系,导致其语义一致性无法维持.本文通过在地址空间转换策略的内部线性地址空间上添加原操作及本地操作历史序列,修正本地操作广播及远程操作接收过程以维持各分解操作的关联关系,并引入"Retrace-Undo-VT-Redo-Retrace"控制过程,实现对关联操作语义信息的分布式维持.本文最后通过实例分析展示了整个策略的工作过程.In replicated two-dimensional collaborative design environments, address space transformation strategy can be used to reach consistency maintenance of shared documents. However, during the execution process of the reference operations, they are first be decomposed into primitive operations and during the decomposition process, the relationships between the referencing objects and referenced objects are lost, thus resulting into inconsistency between these objects if remote sites release operations targeted at the referenced objects concurrently. The paper introduces to append two history buffers （original op HB and local-exe op HB） to maintain the relationships between the original operations and the decomposed ones, modifies the generation and reception process of the operations and introduces ＂Retrace-Undo-VT-Redo-Retrace＂ process to realize the distributed consistency maintenance of reference operations. Finally, the paper demonstrates the work flow of the strategy with a case analysis.

关 键 词：协同设计 复制式架构 地址空间转换 关联操作 一致性维护 

分 类 号：TP311[自动化与计算机技术—计算机软件与理论]