Concurrency Control In Collaborative Design

With the rapid development of Internet Technologies, synchronized collaborative design becomes a significant product design mode to reduce the cost and improve the efficiency of design process. In this paper, the concurrency control, the kernel of the synchronized collaborative design technology, is researched.New definition of concurrent conflict in collaborative design is presented and a fitting framework of concurrency control is designed. Two elementary concurrency control mechanisms, avoidance and resolve of concurrent conflict, are introduced. The related detection method of concurrent conflict is analyzed, as well as the principle of mechanism adopting. Next, the specific concurrency situation in collaborative design and its traits are induced and summarized. Based on the analysis above, a new definition of concurrent conflict in collaborative design and a fitting frame of concurrency control are presented.According to the definition of concurrent conflict in synchronized collaborative design and analysis of specific characteristics of concurrent conflict in central collaborative design system, a more suitable definition of concurrent conflict and detailed composite concurrency control method are presented. Moreover, a web-based collaborative design prototype system, WebCOSMOS, is implemented. The structure of such systems and some key issues are learned and identified in WebCOSMOS.In conformity to the definition of concurrent conflict in synchronized collaborative design and analysis of specialties of concurrent conflict in replicated collaborative design system, a detailed concurrency control method is presented. Moreover, a replicated collaborative design prototype system, NetCOSMOS, is implemented. Meanwhile, the detailed blueprint of such systems is studied and the concurrency control mechanism adopted is identified in NetCOSMOS.