面向对象领域设计中的变化性处理

Dealing with the Variability in Object-Oriented Domain Design

在领域工程中识别、描述和实现变化性 ,对应用系统的开发具有重要的指导意义和直接作用 .其中在领域设计阶段 ,建立比较合理、比较灵活的DSSA ,将系统的可变部分与固定部分分离开来 ,将系统成分在DSSA和构件之间进行合理的分配 ,把变化性实现为构件 ,是领域工程的核心及关键性工作 .本文运用设计模式和OO框架 ,提出了面向对象领域设计中常见变化性的解决方案 ,并将这些方案应用于POS领域的领域设计 .

Identifying, representing and implementing the variability in domain engineering have a direct and important effect on application engineering; they are the emphases of domain engineering. Especially, building the reasonable and flexible DSSA (Domain Specific Software Architecture) in domain design, separating fixed parts and variable parts of systems, assigning the system elements between the DSSA and components reasonably, and implementing the variability as components are the nucleus and key work of domain engineering. This paper discusses the corresponding solutions to the variability of object-oriented domain design, employing the research results of design pattern and object-oriented framework; and presents how to use these solutions to deal with the variability in the domain design of POS (Point-of-Sale) domain.