基于对象的协同策略控制模型

Objects Based Model for Controlling Cooperative Policies

1 引言 协同策略除了包括通常的存取控制规则、并发控制规则、发言权控制规则外,还应包括协同感知控制规则、数据分布方案、角色行为准则和例外处理等.这些协同策略通常因工作方式和工作组的组织结构不同而不同,即便同一个组在协作中的不同阶段也可能采用不同的协同策略.因此协同系统的开发应是启发式的,协同策略的定义通常需要最终用户、系统开发者和某些领域的专家进行不断交互和扩充.

Since their collaborative policies are embedded directly in application programs, the existing CSCW systems have fixed collaborative policies and low collaboration efficiency and they are not portable and reusable. To overcome these problems, we present a model for controlling cooperative policies in this paper. The cooperative policies are separated from the computing program in this model. The part of controlling cooperative policies consists of a policies engine and an awareness controller and is a virtual machine for coordinating collaborative tools. The Language for Describing Cooperative Policies (CPDL) supported by the virtual machine is also proposed. Programmers and users can use the CPDL to coordinate the cooperative tools to be operated, furthermore can easily reuse collaborative tools and dynamically modify cooperative policies in runtime.