基于同步令牌的视图同步技术研究

A Flexible WYSIWIS for Collaborate CAD

在协同产品开发过程中,视图同步是进行同步协同的重要实现手段,其应用模式和实现机制对产品协同开发效率影响巨大。针对一般视图同步模式过于严格的限制,从空间、时间、人员、内容等4个方面分析了对严格视图同步的放松,提出了基于同步令牌的柔性视图同步方法。将协同用户分类为主持人、参与者和旁观者,用户在协同过程中可以处于开放或者私有状态,可以在视图同步操作中扮演发起者或接受者的角色。定义了同步令牌及其操作;从视图同步的方向和时效性方面对其进行分类,给出了4个基于同步令牌的视图同步操作及其操作权限。比较了该方法与现实世界会议中的类似概念。开发了原型系统来验证所提出方法的实用性。

WYSIWIS （What You See Is What I See） is the prerequisite of collaborative CAD meeting, which, in its turn, has attracted increasing attention of CAD/CAM engineers. We aim to present our research results on a flexible WYSIWIS. In the full paper, we explain in much detail the flexible WYSIWIS developed by us; here we give only a briefing. The flexibility we provide is, we believe, quite convenient for participants of collaborative CAD meeting in the following two respects： （1） the participant who provides views （sponsor） can select at what time he wants the view to be seen by selected or all participants （receivers）; （2） the receiver can select at what time he wants to see the views of a certain sponsor. The topics discussed in this paper are： analysis of view synchronization, the classification of participants, the definition of View Synchronization Token （VST）, the four operations that synchronize view, the operation rules concerning VST, and a comparison of corresponding concepts between real-world meeting and the collaborative CAD meeting provided by the flexible WYSIWIS we developed,