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itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">RocketMQ EventBridge 核心概念</span><meta itemprop="position" content="2"></li></ul></nav><span class="theme-doc-version-badge badge badge--secondary">版本：5.0</span><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">本页总览</button></div><div class="theme-doc-markdown markdown"><h1>RocketMQ EventBridge 核心概念</h1><p>理解EventBridge中的核心概念，能帮助我们更好的分析和使用EventBridge。本文重点介绍下EventBridge中包含的术语：</p><ul><li>EventSource：事件源。用于管理发送到EventBridge的事件，所有发送到EventBridge中的事件都必须标注事件源名称信息，对应CloudEvent事件体中的source字段。</li><li>EventBus：事件总线。用于存储发送到EventBridge的事件。</li><li>EventRule：事件规则。当消费者需要订阅事件时，可以通过规则配置过滤和转换信息，将事件推送到指定的目标端。</li><li>FilterPattern：事件过滤模式，用于在规则中配置过滤出目标端需要的事件。</li><li>Transform：事件转换，将事件格式转换成目标端需要的数据格式。</li><li>EventTarget：事件目标端，即我们真正的事件消费者。</li></ul><p>下面，我们具体展开：</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="eventsource">EventSource<a href="#eventsource" class="hash-link" aria-label="EventSource的直接链接" title="EventSource的直接链接"></a></h2><p>事件源，代表事件发生的源头，用来描述一类事件，一般与微服务系统一一对应。比如：交易事件源、考勤事件源等等。事件源，是对事件一个大的分类，一个事件源下面，往往会包含多种事件类型(type)，比如交易事件源下面，可能包含：下单事件、支付事件、退货事件等等。</p><p>另外，需要值得注意的是，事件源并不用来描述发生事件的实体，取而代之的是，在CloudEvent中，我们一般选用subject来表示产生这个事件的实体资源。事件源有点像市场经济大卖场中的大类分区，例如：生鲜区、日化日用区、家用电器区等等。在事件中心这个"大卖场"，我们可以通过事件源快速的找到我们需要的事件。</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="eventbus">EventBus<a href="#eventbus" class="hash-link" aria-label="EventBus的直接链接" title="EventBus的直接链接"></a></h2><p>事件总线是存储事件的地方，其下可以有多种实现，包括Local、RocketMQ、Kafka等。</p><p>事件生产者发送事件的时候，必须指定事件总线。事件总线是EventBridge的一等公民，其他所有资源都围绕事件总线形成逻辑上的隔离，即：事件源、事件规则必须都隶属于某一个事件总线下。不同事件总线下的事件源和事件规则可以重名，但是同一个事件总线下的事件源和规则必须不重名。</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="eventrule">EventRule<a href="#eventrule" class="hash-link" aria-label="EventRule的直接链接" title="EventRule的直接链接"></a></h2><p>当消费者需要订阅事件时，可以通过事件规则配置过滤和转换信息，将事件推送到指定的目标端。所以，事件规则包含三部分：事件过滤+事件转换+事件目标。</p><p><img loading="lazy" alt="img_1.png" src="/zh/assets/images/EventRule-c822b08589be43f273884c8b21bcb7de.png" width="572" height="360" class="img_ev3q"></p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="filterpattern">FilterPattern<a href="#filterpattern" class="hash-link" aria-label="FilterPattern的直接链接" title="FilterPattern的直接链接"></a></h2><p>通过事件过滤模式，我们可以对事件总线上的事件进行过滤，只将目标端需要的事件推送过去，以减少不必要的开通，同时减轻消费者 |
