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今天我们要讲的是

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DDD领域驱动设计浮夸

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Eric Evans开了个坏头

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在《领域驱动设计》的

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前言，也就是这本书的正文

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Eric Evans写的第一句话

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他就说了这么一段话

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翻译起来就是这个意思

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意思是什么

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至少20年

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一直没有人写点什么

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关于领域建模设计

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没写什么

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一直到他这个哲学

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暗流

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出现，领域驱动设计

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这是他写在书上的

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他本人写的第一句话

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那至少20年

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这本书是写于2003年，出版于2003年

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按Evans说的

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就是

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前面20年是

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1983年到2002年

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几乎没有人写什么

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是这样的吗

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一想就不是嘛

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对不对

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否则UML怎么来的

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UML就是因为什么

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各种各样的建模方法学太多了

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不止面向对象的

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还有面向过程的

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UML里面的活动图

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这个就是

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改善的是面向过程

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包括数据流等等

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太多了，才要统一符号

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统一表示法嘛

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对不对

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你看，这是《UML参考手册》上

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介绍的历史

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另外

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只要大家去翻以前的书

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介绍这个UML怎么来的

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基本上都会有讲这个问题

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你看，这里说的

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大把的这个

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书籍面世

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一堆一堆

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大家也可以用这些关键词去搜嘛

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你到亚马逊也好

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到哪个国外的书店

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去搜1983到2002年时间段

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出了哪些书

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如果你要搜论文就更多了

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对不对

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你光搜书都可以的

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下面我们列一些书上的图

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你可以把它跟现在的各种DDD文章里面的各种发明对比

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看哪个里面的逻辑更复杂

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这是90年的

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这是

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Coad和Yourdon

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也就是OOA/OOD方法学

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书里面一张类图

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你看，这里就把类图画成了若干个主题

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对不对

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分割成若干主题

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这本书有中译本

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北大出版社出版的

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也是1992年左右翻译的

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这个是Rumbaugh

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Rumbaugh就是UML三个人里面的一个，1991年的这本书

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这个书好像没有中译本

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我找了没找到

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应该是没有的

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你看这里面，类图对吧

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这是类图

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状态图

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状态图

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这是92年

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这个是

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Shaler

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还有Mellor

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这个应该是

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1992年

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的方法学

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他主要是以这个

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类图和状态图

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作为主要的建模方法

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这是他画的状态图

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你看是方框

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实际上是状态

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你看，这个状态的命名

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你看

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是现在分词，或者是过去分词

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像现在很多各种各样

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他也画一个状态图

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结果出来是一个动词

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甚至有的是名词

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那这个瞎搞了

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那95年

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这个是Coad的这个书

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那这个书，英文我就没找着了

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我找了一个中译本的

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你看，它里面列了很多很多案例

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包括怎么样分析的，对不对

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你看，这是销售的，对吧

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这个书有中译本

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大家可以去找来看看

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类图

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Coad

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还有这个很有名的了，彩色建模

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里面列了很多领域的类图

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序列图等等

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这个也有中译本

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是我们翻译的

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大家可以

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找来看看

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那前面讲的就是面向对象建模了

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如果不限于面向对象的

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那就更多了

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比如说

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这是90年的

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实际上更早的都有

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因为

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像实体关系图，类似的

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七十年代就有了

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对不对

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但是因为

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Evans刚才说的是

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二十年以来嘛

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那就是1983到2002嘛

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我们就特地选了这个地方

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像90年这个，这个叫Teorey

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Teorey这个

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这个是

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数据库建模，他用的是E/R图

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你看，右边这个图

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那96年，就是Hay这个

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这是也用的是

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鸦脚的图

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也是E/R图的一个变体

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你看，这是一个

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开支的

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开支的一个

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一个领域的模型

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这本书

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实际上就是以

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E/R图来描述的

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分析模式的归纳

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它出版比分析模式

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Martin Fowler

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那个《分析模式》要早一点点

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Fowler分析模式那本书的序言里面就有提到这个书

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但是因为这本书

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他不是Fowler写的

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没有在这个圈子里面

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所以呢，大家都不知道

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因为

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我们之前说过

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他圈子里面互相引用

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他只引用自己圈子里面的

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圈子外的他不引用

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或者说，他会

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包装一下

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由一个圈子里面的人来包装一下再引用

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这种手法

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我们之前的视频和文章已经提到过很多次了

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大家感兴趣可以找我的文章

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前面讲的

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不管是面向对象

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面向过程

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都是说软件开发为目的

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如果不限于软件开发

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仅仅是对领域做描述的这种领域工程

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那就还有更多了

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那这方面的话

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我就不是很擅长了

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但是大家可以去

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找这相关的

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按照关键词搜相关内容

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那我这里就

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借花献佛

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我就用了一个

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我在网络上搜到的一个幻灯片

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来展示一下

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大家也可以去按这个搜

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好几个地方有下载的

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你看，他说

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80年代初期开始了什么什么什么

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提出了什么什么什么

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有很多成果

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有这个这个这个这个这个

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然后呢

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下面说这个这个这个

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你看这80年代的

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80年代提出来的

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所以呢

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Evans说的

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几乎没有人写点什么

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这是错的

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把前面20年描述成荒漠

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为领域驱动设计营造出横空出世的感觉

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这是一种夸大

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我们前面列出的资料

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Evans 

243
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没有提到

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他唯一提到的一本

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就是Martin Fowler的分析模式

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那我们前面故意就没有提

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到底是一无所知，还是刻意忽略

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这就不得而知了

249
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但是我前面已经提到很多次

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圈子内的封闭引用

251
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这是一个

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很大的问题

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那么

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我历来的评价是这样

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你看，2009年我写的文章

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这是发在《程序员》杂志上

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我们是

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国内最早的

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接触到这个

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然后引进来，向大家介绍的，包括书什么的

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最先也是我们做的嘛

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所以呢

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你看，我当时说什么，起到了一个什么

264
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拨乱反正的作用，对不对

265
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这个地方

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并没有说他是什么伟大的创新

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本来就是这样

268
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你看，最开始就是这样的，对吧

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后来

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受到各种冲击

271
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因为这样比较难

272
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后来就有人去推销各种各样拍脑袋的做法

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就把它带偏掉了

274
00:11:34,770 --> 00:11:36,247
包括现在都是一样

275
00:11:36,247 --> 00:11:37,910
很多人就会这个

276
00:11:38,190 --> 00:11:39,170
就会这个

277
00:11:39,640 --> 00:11:41,288
他写面向对象建模

278
00:11:41,288 --> 00:11:44,770
他就写这个，下面这个什么SRP、OCP这个

279
00:11:45,260 --> 00:11:47,026
你让他复杂点，他不会的

280
00:11:47,026 --> 00:11:48,263
他就会念叨这个

281
00:11:48,263 --> 00:11:49,853
以为这个就有用了

282
00:11:49,853 --> 00:11:50,560
没用的

283
00:11:53,400 --> 00:11:55,583
你看，我说的拨乱反正

284
00:11:55,583 --> 00:11:56,020
对吧

285
00:11:57,200 --> 00:11:58,804
本来这没有什么

286
00:11:58,804 --> 00:12:01,812
那为什么近年我就开始批评这个呢

287
00:12:01,812 --> 00:12:04,620
因为到2017或2018左右

288
00:12:05,150 --> 00:12:08,840
突然就被包装成革命性的创造

289
00:12:09,120 --> 00:12:11,161
划时代的洞见

290
00:12:11,161 --> 00:12:14,370
巨人等等，就被包装出来

291
00:12:15,780 --> 00:12:16,830
所以呢

292
00:12:17,450 --> 00:12:19,520
我才会去批评他

 

0
00:00:01,120 --> 00:00:03,351
Evans的书有没有问题呢

1
00:00:03,351 --> 00:00:07,814
有的，主要问题就是我们前面说过很多遍的

2
00:00:07,814 --> 00:00:09,600
他只有D的知识

3
00:00:09,890 --> 00:00:12,083
然后从D的角度去臆想

4
00:00:12,083 --> 00:00:13,280
ABC的知识

5
00:00:15,580 --> 00:00:17,400
但是呢

6
00:00:18,360 --> 00:00:19,396
如果是低调的

7
00:00:19,396 --> 00:00:20,950
没有故意渲染

8
00:00:22,070 --> 00:00:24,160
那么，也没有必要去批评他

9
00:00:25,950 --> 00:00:29,650
但是如果说，被人有意无意利用

10
00:00:29,930 --> 00:00:31,140
来包装

11
00:00:31,620 --> 00:00:34,480
那这个就有批评的必要了