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| <h2 id="_1">概念阐述</h2> |
| <p>分布式调用链追踪提供了服务间调用的时序信息，但服务内部的链路调用信息对开发者同样重要，如果能将两者合二为一，就能提供更完整的调用链，更容易定位错误和潜在性能问题。</p> |
| <h2 id="_2">前提条件</h2> |
| <ul> |
| <li>使用自定义打点功能需要首先配置并启用Java Chassis微服务调用链。</li> |
| </ul> |
| <h2 id="_3">注意事项</h2> |
| <ul> |
| <li>使用<code>@Span</code>注释的自定义打点功能只支持和Java Chassis调用请求同一线程的方法调用。</li> |
| <li>添加<code>@Span</code>注释的方法必须是Spring管理的Bean，否则需要按这里<a href="https://stackoverflow.com/questions/41383941/load-time-weaving-for-non-spring-beans-in-a-spring-application">提到的方法</a>配置。</li> |
| </ul> |
| <h2 id="_4">自定义调用链打点</h2> |
| <p>该功能集成了Zipkin，提供<code>@Span</code>注释为需要追踪的方法自定义打点。Java Chassis将自动追踪所有添加<code>@Span</code>注释的方法，把每个方法的本地调用信息与服务间调用信息连接起来。</p> |
| <h2 id="_5">使用步骤:</h2> |
| <h3 id="_6">添加依赖</h3> |
| <p>基于 ServiceComb Java Chassis 的微服务只需要添加如下依赖到 pom.xml：</p> |
| <pre><code class="language-xml"> <dependency> |
| <groupId>org.apache.servicecomb</groupId> |
| <artifactId>tracing-zipkin</artifactId> |
| </dependency> |
| </code></pre> |
| <h3 id="_7">启用自定义打点功能 {#配置追踪处理和数据收集}</h3> |
| <p>在应用入口或Spring配置类上添加<code>@EnableZipkinTracing</code>注释：</p> |
| <pre><code class="language-java">@SpringBootApplication |
| @EnableZipkinTracing |
| public class ZipkinSpanTestApplication { |
| public static void main(String[] args) { |
| SpringApplication.run(ZipkinSpanTestApplication.class); |
| } |
| } |
| </code></pre> |
| <h3 id="_8">定制打点</h3> |
| <p>在需要定制打点的方法上添加<code>@Span</code>注释：</p> |
| <pre><code class="language-java">@Component |
| public class SlowRepoImpl implements SlowRepo { |
| private static final Logger logger = LoggerFactory.getLogger(SlowRepoImpl.class); |
| |
| private final Random random = new Random(); |
| |
| @Span |
| @Override |
| public String crawl() throws InterruptedException { |
| logger.info("in /crawl"); |
| Thread.sleep(random.nextInt(200)); |
| return "crawled"; |
| } |
| } |
| </code></pre> |
| <p>就这样，通过使用<code>@Span</code>注释，我们启动了基于 Zipkin 的自定义打点功能。</p> |
| <h2 id="_9">定制上报的数据</h2> |
| <p>通过自定义打点上报的调用链包含两条数据：</p> |
| <ul> |
| <li><strong>span name</strong> 默认为当前注释的方法全名。</li> |
| <li><strong>call.path</strong> 默认为当前注释的方法签名。</li> |
| </ul> |
| <p>例如，上述例子<code>SlowRepoImp</code>里上报的数据如下：</p> |
| <table> |
| <thead> |
| <tr> |
| <th align="left">key</th> |
| <th align="left">value</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td align="left">span name</td> |
| <td align="left">crawl</td> |
| </tr> |
| <tr> |
| <td align="left">call.path</td> |
| <td align="left">public abstract java.lang.String org.apache.servicecomb.tests.tracing.SlowRepo.crawl() throws java.lang.InterruptedException</td> |
| </tr> |
| </tbody> |
| </table> |
| <p>如果需要定制上报的数据内容，可以传入自定义的参数：</p> |
| <pre><code class="language-java"> public static class CustomSpanTask { |
| @Span(spanName = "transaction1", callPath = "startA") |
| public String invoke() { |
| return "invoke the method"; |
| } |
| } |
| </code></pre> |
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