领域驱动设计Domain-DrivenDesign

    领域驱动讲求将领域模型作为领域专家、分析人员、开发人员之间交流沟通的核心。传统的瀑布模型方式下，缺乏有效的反馈机制，在链路上领域知识以不同的表现形式进行传递，知识的丢失容易造成需求与实现之间的断层。传统的迭代方式下，软件产品的优秀程度取决于开发者对领域知识的兴趣和掌握程度。

Chapter One. Crunching Knowledge
    领域模型是领域专家和分析人员互相沉淀知识的一个工具，它帮助分析人员理解领域知识，也为领域专家提供一个规范的表达形式，有条有理的描绘领域知识，分析、解决领域问题。另外，领域模型也是开发团队知识沉淀的一种方式，帮助开发人员了解他所从事的特定领域，提高建模技能。

Chapter Two. Communication and the Use of Language
    领域模型其实是一种语言，领域专家与分析人员、开发人员之间交流的通用语言。
    一开始，分析人员与领域专家需要对这个通用语言达成一致，双方能熟练的运用领域模型描述问题，表达、分析、处理问题。
    1. 领域模型不是图，图只是让核心、关键的概念清晰的呈现出来。图的表达能力有限，模型必须配备描述（需求采集会议中的口头描述，或文档中的文字描述），将图形所代表的意义，以及图形中没有呈现出来的规则、断言、细节进行补充，才能完整地表述需求。
    2. 领域模型的UML或者类UML图不能太细太完整，否则过于庞大的模型会干扰人的思维，阻碍对主要部分，或者复杂逻辑的梳理。业务总是被切分成一个个片断进行分析，在每一个片断里，画出几个主要的对象和交互逻辑，细节的部分用文字记录、描述。
    3. 领域模型中不应当出现设计、技术方面的术语，也不应当出现开发人员不理解的业务术语。

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