Entity-Centric Concurrent Manipulation Control Scheme for Cooperative Design

Study of concurrent manipulation control scheme is an important problem for the cooperative design.The essence of the problem is how to solve manipulation confliction and provide conflictionfree manipulation.Consistency,responsiveness and concurrency are three important but mutually exclusive requirements for concurrent manipulation control.Hence,the focus of concurrent manipulation control scheme is how to solve manipulation confliction with minimum response time and maximum concurrency under the condition of consistency.This paper proposes several design considerations for concurrent manipulation control scheme,presents an entity-centric concurrent manipulation scheme based on a series of formalized concepts and depicts its overall implementation in detail.This scheme adopts confliction elimination rather than confliction avoidance and implements relaxed WYSIWIS through local manipulation,server-end manipulation validation and replica synchronization.Local manipulation improves responsiveness；server-end manipulation validation maximizes concurrency and replica synchronization guarantees consistency.