一个基于关注点分离的实时与交互协同模型

A REAL-TIME AND INTERACTIVE COORDINATION MODEL BASED ON SEPARATION OF CONCERNS

针对开放分布式实时系统中自治实体的交互行为和实时约束行为动态变化的问题,利用关注点分离思想,设计了一个具有实时与交互适应性的事件驱动协同模型。将传统自治实体分离成三种相对独立的实体:时控协同器、交互协同器和纯的计算实体。最后,利用Java消息服务和EJB技术给出了详细的实现构架,并通过一个车辆导航系统的实例说明这个构架如何取得交互和实时的适应性和灵活性。

In view of the dynamic change of interactive behaviour and real-time constraint of the autonomous entities in open distributed real-time system, the paper presents an event-driven coordination model with real-time and interactive adaptability based on the idea of concerns separation. In the model there are three categories of relatively independent entities separated from the traditional autonomous entity ： the time- controlled coordinator, the interactive coordinator and the pure computation entity. Finally, an implementation framework is suggested in detail using the Java message service and the EJB technology, and an instance of vehicle navigation system is employed to illustrate how the frame- work can achieve interactive and real-time adaptability and flexibility.