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DDD 中的 Ubiquitous Language |
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DDD 中的 Ubiquitous Language
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Mar 14, 2025
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<p>Ubiquitous Language（通用语言）是 Domain-Driven Design (DDD) 中的一个核心概念。它是一种共享的、统一的语言，用于描述和讨论领域模型中的概念和规则。Ubiquitous Language 的目的是确保开发团队和业务专家之间的沟通更加高效和准确，从而减少误解和错误。</p>
<p>一般来说，Ubiquitous Language 有以下特点：</p>
<ol>
<li>共享：Ubiquitous Language 是由开发团队和业务专家共同创建和使用的。它不仅用于代码和文档，还用于日常的沟通和讨论。</li>
<li>统一：在整个项目中，Ubiquitous Language 应该是一致的。无论是在代码、文档、会议还是白板上，都应该使用相同的术语和概念。</li>
<li>精确：Ubiquitous Language 应该尽可能精确，避免模糊和歧义。每个术语都应该有明确的定义和含义。</li>
<li>演进：Ubiquitous Language 是动态的，会随着项目的进展和业务需求的变化而演进。团队应该定期审查和更新它。</li>
</ol>
<p>基于此，它可以用在这些地方：</p>
<ol>
<li>命名：在代码中使用 Ubiquitous Language 来命名类、方法、变量等。例如，如果业务专家使用“订单”来描述一个概念，那么在代码中也应该使用“Order”而不是“Purchase”或“Transaction”。</li>
<li>文档：在文档中使用 Ubiquitous Language 来描述系统的设计、架构和功能。这有助于业务专家更容易理解技术文档。</li>
<li>沟通：在团队会议、讨论和白板会议中使用 Ubiquitous Language。这有助于确保所有参与者都在讨论同一个概念。</li>
<li>测试：在编写测试用例时，使用 Ubiquitous Language 来描述测试的前提条件、步骤和预期结果。这有助于确保测试覆盖了业务需求。</li>
</ol>
<p>假设正在开发一个电子商务系统，业务专家使用“订单”来描述用户购买的商品集合。团队可以在代码中使用“Order”来命名相关的类和方法：</p>
<figure class="highlight fsharp"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">type</span> <span class="title class_">Order</span> <span class="operator">=</span> {</span><br><span class="line"> items<span class="operator">:</span> OrderItem <span class="type">list</span></span><br><span class="line"> customer<span class="operator">:</span> Customer</span><br><span class="line"> orderDate<span class="operator">:</span> DateTime</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="keyword">type</span> <span class="title class_">OrderItem</span> <span class="operator">=</span> {</span><br><span class="line"> product<span class="operator">:</span> Product</span><br><span class="line"> quantity<span class="operator">:</span> <span class="type">int</span></span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="keyword">type</span> <span class="title class_">Customer</span> <span class="operator">=</span> {</span><br><span class="line"> name<span class="operator">:</span> <span class="type">string</span></span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="keyword">type</span> <span class="title class_">Product</span> <span class="operator">=</span> {</span><br><span class="line"> name<span class="operator">:</span> <span class="type">string</span></span><br><span class="line"> price<span class="operator">:</span> <span class="type">float</span></span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="keyword">let</span> addItem (order<span class="operator">:</span> Order) (item<span class="operator">:</span> OrderItem) <span class="operator">=</span></span><br><span class="line"> { order <span class="keyword">with</span> items <span class="operator">=</span> order.items <span class="operator">@</span> [item] }</span><br><span class="line"></span><br><span class="line"><span class="keyword">let</span> getTotalAmount (order<span class="operator">:</span> Order) <span class="operator">=</span></span><br><span class="line"> <span class="keyword">let</span> total <span class="operator">=</span> <span class="number">0.0</span></span><br><span class="line"> <span class="keyword">for</span> item <span class="keyword">in</span> order.items <span class="keyword">do</span></span><br><span class="line"> total <span class="operator"><-</span> total <span class="operator">+</span> item.price</span><br><span class="line"> total</span><br><span class="line"></span><br><span class="line"><span class="keyword">let</span> getPrice (item<span class="operator">:</span> OrderItem) <span class="operator">=</span></span><br><span class="line"> item.product.price <span class="operator">*</span> item.quantity</span><br><span class="line"></span><br><span class="line"><span class="keyword">let</span> getTotalPrice (order<span class="operator">:</span> Order) <span class="operator">=</span></span><br><span class="line"> <span class="keyword">let</span> total <span class="operator">=</span> <span class="number">0.0</span></span><br><span class="line"> <span class="keyword">for</span> item <span class="keyword">in</span> order.items <span class="keyword">do</span></span><br><span class="line"> total <span class="operator"><-</span> total <span class="operator">+</span> getPrice(item)</span><br><span class="line"> total</span><br></pre></td></tr></table></figure>
<p>在这个示例中使用了“Order”、“OrderItem”、“Customer”和“Product”等术语，这些术语都是 Ubiquitous Language 的一部分，可以提高代码与业务需求的一致性。</p>
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