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class="breadcrumbs__link" href="/zh-CN/"><svg viewBox="0 0 24 24" class="breadcrumbHomeIcon_OVgt"><path d="M10 19v-5h4v5c0 .55.45 1 1 1h3c.55 0 1-.45 1-1v-7h1.7c.46 0 .68-.57.33-.87L12.67 3.6c-.38-.34-.96-.34-1.34 0l-8.36 7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill="currentColor"></path></svg></a></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">架构设计</span><meta itemprop="position" content="1"></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">关键特性架构</span><meta itemprop="position" content="2"></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">公共增强模块</span><meta itemprop="position" content="3"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item"><a class="breadcrumbs__link" itemprop="item" href="/zh-CN/docs/1.3.2/architecture/feature/public-enhancement-services/context-service/"><span itemprop="name">上下文服务</span></a><meta itemprop="position" content="4"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">CS Cache 架构</span><meta itemprop="position" content="5"></li></ul></nav><span class="theme-doc-version-badge badge badge--secondary">版本：1.3.2</span><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>CS Cache 架构</h1></header><h2 class="anchor anchorWithStickyNavbar_LWe7" id="cscache架构"><strong>CSCache架构</strong><a class="hash-link" href="#cscache架构" title="Direct link to heading"></a></h2><h3 class="anchor anchorWithStickyNavbar_LWe7" id="需要解决的问题"><strong>需要解决的问题</strong><a class="hash-link" href="#需要解决的问题" title="Direct link to heading"></a></h3><h3 class="anchor anchorWithStickyNavbar_LWe7" id="11-内存结构需要解决的问题">1.1. 内存结构需要解决的问题：<a class="hash-link" href="#11-内存结构需要解决的问题" title="Direct link to heading"></a></h3><ol><li><p>支持按ContextType进行拆分：加快存储和查询性能</p></li><li><p>支持按不同的ContextID进行拆分：需要完成ContextID间元数据隔离</p></li><li><p>支持LRU：按照特定算法进行回收</p></li><li><p>支持按关键字进行检索：支持通过关键字进行索引</p></li><li><p>支持索引：支持直接通过ContextKey进行索引</p></li><li><p>支持遍历：需要支持通过按照ContextID、ContextType进行遍历</p></li></ol><h3 class="anchor anchorWithStickyNavbar_LWe7" id="12-加载与解析需要解决的问题">1.2 加载与解析需要解决的问题：<a class="hash-link" href="#12-加载与解析需要解决的问题" title="Direct link to heading"></a></h3><ol><li><p>支持将ContextValue解析成内存数据结构：需要完成对ContextKey和value解析出对应的关键字。</p></li><li><p>需要与与Persistence模块进行对接完成ContextID内容的加载与解析</p></li></ol><h3 class="anchor anchorWithStickyNavbar_LWe7" id="13-metric和清理机制需要解决的问题">1.3 Metric和清理机制需要解决的问题：<a class="hash-link" href="#13-metric和清理机制需要解决的问题" title="Direct link to heading"></a></h3><ol><li><p>当JVM内存不够时能够基于内存使用和使用频率的清理</p></li><li><p>支持统计每个ContextID的内存使用情况</p></li><li><p>支持统计每个ContextID的使用频率</p></li></ol><h2 class="anchor anchorWithStickyNavbar_LWe7" id="contextcache架构"><strong>ContextCache架构</strong><a class="hash-link" href="#contextcache架构" title="Direct link to heading"></a></h2><p>ContextCache的架构如下图展示：</p><p><img loading="lazy" src="/zh-CN/assets/images/linkis-contextservice-cache-01-f88da12027f01881d55746cb0ea160e4.png" width="594" height="461" class="img_ev3q"></p><ol><li><p>ContextService：完成对外接口的提供，包括增删改查；</p></li><li><p>Cache：完成对上下文信息的存储，通过ContextKey和ContextValue进行映射存储</p></li><li><p>Index：建立的关键字索引，存储的是上下文信息的关键字和ContextKey的映射；</p></li><li><p>Parser：完成对上下文信息的关键字解析；</p></li><li><p>LoadModule当ContextCache没有对应的ContextID信息时从持久层完成信息的加载；</p></li><li><p>AutoClear：当Jvm内存不足时完成对ContextCache进行按需清理；</p></li><li><p>Listener：用于监听ContextCache的Metric信息，如：内存占用、访问次数。</p></li></ol><h2 class="anchor anchorWithStickyNavbar_LWe7" id="contextcache存储结构设计"><strong>ContextCache存储结构设计</strong><a class="hash-link" href="#contextcache存储结构设计" title="Direct link to heading"></a></h2><p><img loading="lazy" src="/zh-CN/assets/images/linkis-contextservice-cache-02-141cbbb9fd040b22838d97aa342ceaa8.png" width="650" height="555" class="img_ev3q"></p><p>ContextCache的存储结构划分为了三层结构：</p><p><strong>ContextCach：</strong>存储了ContextID和ContextIDValue的映射关系，并能够完成ContextID按照LRU算法进行回收；</p><p><strong>ContextIDValue：</strong>拥有存储了ContextID的所有上下文信息和索引的CSKeyValueContext。并统计ContextID的内存和使用记录。</p><p><strong>CSKeyValueContext：</strong>包含了按照类型存储并支持关键词的CSInvertedIndexSet索引集，还包含了存储ContextKey和ContextValue的存储集CSKeyValueMapSet。</p><p>CSInvertedIndexSet：通过CSType进行分类存储关键词索引</p><p>CSKeyValueMapSet：通过CSType进行分类存储上下文信息</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="contextcache-uml类图设计"><strong>ContextCache UML类图设计</strong><a class="hash-link" href="#contextcache-uml类图设计" title="Direct link to heading"></a></h2><p><img loading="lazy" src="/zh-CN/assets/images/linkis-contextservice-cache-03-f43df4b6ed2844192de9058e9bc0d376.png" width="1927" height="1419" class="img_ev3q"></p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="contextcache-时序图"><strong>ContextCache 时序图</strong><a class="hash-link" href="#contextcache-时序图" title="Direct link to heading"></a></h2><p>下面的图绘制了以ContextID、KeyWord、ContextType去ContextCache中查对应的ContextKeyValue的整体流程。 |
| <img loading="lazy" src="/zh-CN/assets/images/linkis-contextservice-cache-04-0a5c853730499dbb674bb4e172cc88d6.png" width="1417" height="635" class="img_ev3q"></p><p>说明：其中ContextIDValueGenerator会去持久层拉取ContextID的Array<!-- -->[ContextKeyValue]<!-- -->，并通过ContextKeyValueParser解析ContextKeyValue的关键字存储索引和内容。</p><p>ContextCacheService提供的其他接口流程类似，这里不再赘述。</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="keyword解析逻辑"><strong>KeyWord解析逻辑</strong><a class="hash-link" href="#keyword解析逻辑" title="Direct link to heading"></a></h2><p>ContextValue具体的实体Bean需要在对应可以作为keyword的get方法上面使用注解\@keywordMethod,比如Table的getTableName方法必须加上\@keywordMethod注解。</p><p><img loading="lazy" src="data:image/png;base64,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" width="316" height="105" class="img_ev3q"></p><p>ContextKeyValueParser在解析ContextKeyValue的时候，会去扫描传入的具体对象的所有被KeywordMethod修饰的注解并调用该get方法获得返回对象toString并会通过用户可选的规则进行解析，存入keyword集合里面。规则有分隔符，和正则表达式</p><p>注意事项：</p><ol><li><p>该注解会定义到cs的core模块</p></li><li><p>被修饰的Get方法不能带参数</p></li><li><p>Get方法的返回对象的toSting方法必须返回的是关键字</p></li></ol></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="theme-doc-footer-edit-meta-row row"><div class="col"><a href="https://github.com/apache/linkis-website/edit/dev/i18n/zh-CN/docusaurus-plugin-content-docs/version-1.3.2/architecture/feature/public-enhancement-services/context-service/context-service-cache.md" target="_blank" rel="noreferrer noopener" class="theme-edit-this-page"><svg fill="currentColor" height="20" width="20" viewBox="0 0 40 40" class="iconEdit_Z9Sw" aria-hidden="true"><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 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toc-highlight"><strong>CSCache架构</strong></a><ul><li><a href="#需要解决的问题" class="table-of-contents__link toc-highlight"><strong>需要解决的问题</strong></a></li><li><a href="#11-内存结构需要解决的问题" class="table-of-contents__link toc-highlight">1.1. 内存结构需要解决的问题：</a></li><li><a href="#12-加载与解析需要解决的问题" class="table-of-contents__link toc-highlight">1.2 加载与解析需要解决的问题：</a></li><li><a href="#13-metric和清理机制需要解决的问题" class="table-of-contents__link toc-highlight">1.3 Metric和清理机制需要解决的问题：</a></li></ul></li><li><a href="#contextcache架构" class="table-of-contents__link toc-highlight"><strong>ContextCache架构</strong></a></li><li><a href="#contextcache存储结构设计" class="table-of-contents__link toc-highlight"><strong>ContextCache存储结构设计</strong></a></li><li><a href="#contextcache-uml类图设计" class="table-of-contents__link toc-highlight"><strong>ContextCache UML类图设计</strong></a></li><li><a href="#contextcache-时序图" class="table-of-contents__link toc-highlight"><strong>ContextCache 时序图</strong></a></li><li><a href="#keyword解析逻辑" 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