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我们来看这个用例规约怎么写
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就按照我们前面讲的
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那些内容来写嘛
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执行者
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这个主，这几个辅
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那这个就跟前面的那个系统用例图是对应的了
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对吧
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这是照抄的
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下面就是要
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自己加上去的，前置条件
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后置条件
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前置条件
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是一个背景条件
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就是说
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即使目前蒸馏水这个用例没有在运行
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这个条件依然可以检测，哪一个
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就这个
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背景条件
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后置条件，就是
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这个用例
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要算成功
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那应该是处于什么状态下，这个系统
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这是后置条件
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再往下走
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就是涉众利益了
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这是
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相当于什么，上游
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这是执行者
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这个操作的村民是执行者
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村长
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这是一个比较大的涉众
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但他自己可能不一定操作的
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还有热源厂商
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这可以看作是下游
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或者是这个
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信息的主人
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因为你用的热源
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如果说，我们这个系统故意歧视他的热源
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故意，后面在这个设计上
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针对某种热源
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我就故意搞得
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故意不好好做
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那不把那个厂家给坑了吗
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对不对
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还有，我故意
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我们系统故意去坑这个水分配系统
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把它搞坏
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那后面这些人怎么样
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他也不高兴
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他的利益也会受到损害
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涉众利益
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那我们看，基本路径
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接通水源，调节流量
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这跟我们那个前面的活动图
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是类似的
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只不过把活动图里面的步骤搬到这里来
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那我们加了一些后面这个
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请求水分配系统接受净水
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判断要排空残渣
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这是基本路径
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扩展路径就是有意外的
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比如说
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要是没达到呢
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显然没达到
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是
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发生了很多的，对吧
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没达到
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就直接转到7
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如果没达到需要排空
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那就当前循环就结束了
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就下一个循环
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这是
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扩展路径的条件，这是做法
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字段列表
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就是这个地方
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一个转换的
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输入是污水、热
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输出，净水、残渣
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那么这跟我们前面那个
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画的那个活动图
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那个输入输出是一样的
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就照抄就可以
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照搬就可以
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那这里有一个业务规则
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什么叫足够分配值
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什么叫需要排空值
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如果比较复杂
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比如说，你这个值可能是根据你的这个
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蒸馏器的大小
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还有呢，你的那个水分配系统的管道的粗细
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对吧
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还有那进水的什么粗细什么之类的
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它可能有规格
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有个表格
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如果是这么大的
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那应该是
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多少
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如果是这么大的
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应该多少
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残渣也是一样的
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可能跟很多因素有关
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如果在这里放不下
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你就可以，参见某某某文档的
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里面的某某表格这样写
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质量需求，就是
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包括速度、容量等等
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这个就是做到多好
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那我们可以，比如，平均每小时能处理多少污水
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这个相当于速度
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要快
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对吧
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不能说一天处理一公斤
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那不是瞎搞吗
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还有呢，这个纯度
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你出来这个水质量怎么样
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对吧
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这是质量需求
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设计约束
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无，没有，你爱怎么做怎么做
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如果说有
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你可以怎么加
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比如说
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涉众要求
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一定要用某某品牌的热源
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否则不给钱
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那这里要写
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必须要用某某品牌的热源
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但是必须来自什么
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来自涉众的要求
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包括这个厂家的
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包括那个什么那个
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公益团体的
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包括村民的
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对吧
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比如说，村民就是说
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我们这边就是流行某某热源，那个便宜
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而且是对方厂家免费赠送的
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那就要求你一定要用这个热源
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否则你这个系统就
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不适合他的需要
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设计约束
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一定是来自涉众的
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不能来自我们自己
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不能来自
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设计这个东西的设计团队
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设计团队是不存在的
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我们前面讲愿景的时候也说嘛
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我们做需求的时候
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要把这个
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研发团队看作是死人
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这系统谁做的
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外星人做的
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我们只需要提需求，功能、性能，就行了
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剩下的外星人帮我们搞定
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那用例规约
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就这样来
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这样来写
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