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关于Detail Design

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   上周一个小feature的DD花了我一周的时间!还是 Agile 好啊:写出详细准确的user case,结合UML(class diagram and sequense diagram)和适当的文字说明,适当的代码注释不能少。不过,写DD的过程也是个熟悉框架、代码,并予以完善的过程。
   产品框架设计的不错,代码里常用的design pattern、multi-thread用的不少。代码时间很长了,前后维护的人也很多,需要refacting。
   头疼的是,一个variable用作多个method的input parameter或在多个method中对该variable的值进行多次改变,最后获取这个variable的value。这样做出于什么目的,性能? 没感觉出会有什么性能提升,反正代码是比较难读。
   需要看看jvm相关的资料了,提升code的perfomance很重要。
  
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