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Posted to commits@servicecomb.apache.org by ni...@apache.org on 2017/12/12 09:18:27 UTC
[30/57] [partial] incubator-servicecomb-website git commit: Generated
the static pages for asf-site
http://git-wip-us.apache.org/repos/asf/incubator-servicecomb-website/blob/08e1b43f/content/cn/users/application-boot-process/index.html
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diff --git a/content/cn/users/application-boot-process/index.html b/content/cn/users/application-boot-process/index.html
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+<title>程序启动逻辑 - Apache incubator ServiceComb</title>
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+ <ul>
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+ <li><a href="/cn/users/setup-environment/" class="">环境配置</a></li>
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+ <li><a href="/cn/users/develop-with-jax-rs/" class="">用JAX-RS开发微服务</a></li>
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+ <li><a href="/cn/users/develop-with-transparent-rpc/" class="">用透明RPC开发微服务</a></li>
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+ <li><a href="/cn/users/service-interface-constraints/" class="">服务接口约束</a></li>
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+ <li><a href="/cn/users/communicate-protocol/" class="">通信协议</a></li>
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+ <li><a href="/cn/users/application-boot-process/" class="active">程序启动逻辑</a></li>
+
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+ <li><a href="/cn/users/service-heartbeat/" class="">服务心跳</a></li>
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+
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+ <a href="/cn/users/metrics/"><span class="nav__sub-title nav__sub-title-with-url">监控</span></a>
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+ <span class="nav__sub-title">部署</span>
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+ <li><a href="/cn/users/run-mode/" class="">运行模式</a></li>
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+
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+ <article class="page" itemscope itemtype="http://schema.org/CreativeWork">
+ <meta itemprop="headline" content="程序启动逻辑">
+ <meta itemprop="description" content="程序启动逻辑">
+
+ <meta itemprop="dateModified" content="August 15, 2017">
+
+ <div class="page__inner-wrap">
+
+
+ <header>
+ <h1 class="page__title" itemprop="headline">程序启动逻辑
+</h1>
+
+ </header>
+
+
+
+ <section class="page__content" itemprop="text">
+ <p>服务提供者的启动过程分为初始化Log4j、bean加载(包括配置加载)和服务注册三部分。</p>
+
+<ul>
+ <li>
+ <p>初始化Log4j</p>
+
+ <p><code class="highlighter-rouge">Log4jUtils</code>默认会从<code class="highlighter-rouge">classpath\*:config/base/log4j.properties</code>和<code class="highlighter-rouge">classpath\*:config/log4j.properties</code>两个路径读取log4j配置并合并,将其传递给Log4j的<code class="highlighter-rouge">PropertyConfigurator</code>方法初始化Log4j。如果优先级最高的配置文件是在磁盘上,且其所在目录有写权限,则将合并的配置输出到该目录,以便于维护时观察生效的参数。</p>
+ </li>
+ <li>
+ <p>bean加载</p>
+
+ <p><code class="highlighter-rouge">BeanUtils</code>默认会从<code class="highlighter-rouge">classpath\*:META-INF/spring/\*.bean.xml</code>路径加载配置文件,并将其传递给Spring框架的<code class="highlighter-rouge">ClassPathXmlApplicationContext</code>完成应用上下文加载。在这个过程中会加载foundation-config模块的bean,完成配置加载。</p>
+ </li>
+ <li>
+ <p>服务注册</p>
+
+ <p>在Spring context加载完成后,<code class="highlighter-rouge">io.servicecomb.core.CseApplicationListener</code>会加载handler配置、加载provider的schema信息,最后将微服务信息注册到服务中心。</p>
+ </li>
+</ul>
+
+<blockquote>
+ <p><strong>说明:</strong>
+ServiceComb的配置项分为三个层次:配置中心、环境变量、本地文件,三者优先级依次递减,高优先级中的配置项覆盖低优先级同名配置项。存放在配置中心的配置项可以在运行时修改。</p>
+</blockquote>
+
+
+ </section>
+
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+ <footer>
+ <!-- start custom footer snippets -->
+
+<!-- end custom footer snippets -->
+ <div class="container">
+ <div class="row justify-content-md-center">
+
+ <div class="col">
+ <ul>
+ <p class="header">资源</p>
+ <li><a href="/cn/docs/quick-start/">快速入门</a></li>
+ <li><a href="/cn/users/user-guide/">用户指南</a></li>
+ <li><a href="/cn/slides/">资料</a></li>
+ <li><a href="/cn/users/faq/">常见问题</a></li>
+ </ul>
+ </div>
+ <div class="col">
+ <ul>
+ <p class="header">贡献</p>
+ <li><a href="https://github.com/ServiceComb/ServiceComb.github.io/issues/new?title=Issue with _users/cn/application-boot-process.md">报告本网页问题</a></li>
+ <li><a href="https://github.com/ServiceComb/ServiceComb.github.io/edit/master/_users/cn/application-boot-process.md">在Github上编辑此页</a></li>
+ <li><a href="/cn/developers/submit-codes/">代码提交指南</a></li>
+ </ul>
+ </div>
+ <div class="col">
+ <ul class="social-icons">
+ <p class="header">社区</p>
+ <li>
+ <a href="https://groups.google.com/forum/#!forum/servicecomb-developers" target="_blank"><span class="group">开发者</span></a> |
+ <a href="https://groups.google.com/forum/#!forum/servicecomb-users" target="_blank">用户</span></a>
+ </li>
+ <li>
+ <a href="http://github.com/ServiceComb" target="_blank"><span class="github">Github</span></a>
+ </li>
+ <li>
+ <a href="https://twitter.com/ServiceComb" target="_blank"><span class="twitter">Twitter</span></a>
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http://git-wip-us.apache.org/repos/asf/incubator-servicecomb-website/blob/08e1b43f/content/cn/users/communicate-protocol/index.html
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diff --git a/content/cn/users/communicate-protocol/index.html b/content/cn/users/communicate-protocol/index.html
new file mode 100644
index 0000000..5eb1a49
--- /dev/null
+++ b/content/cn/users/communicate-protocol/index.html
@@ -0,0 +1,1110 @@
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+ <meta itemprop="dateModified" content="August 15, 2017">
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+ <aside class="sidebar__right">
+<nav class="toc">
+ <!-- <header><h4 class="nav__title"><i class="fa fa-file-text"></i> 在本页上</h4></header> -->
+<ul class="toc__menu" id="markdown-toc">
+ <li><a href="#通信协议" id="markdown-toc-通信协议">通信协议</a> <ul>
+ <li><a href="#概念阐述" id="markdown-toc-概念阐述">概念阐述</a></li>
+ <li><a href="#注意事项" id="markdown-toc-注意事项">注意事项</a></li>
+ </ul>
+ </li>
+ <li><a href="#线程模型" id="markdown-toc-线程模型">线程模型</a> <ul>
+ <li><a href="#概念阐述-1" id="markdown-toc-概念阐述-1">概念阐述</a></li>
+ <li><a href="#完整线程" id="markdown-toc-完整线程">完整线程</a></li>
+ </ul>
+ </li>
+ <li><a href="#rest-over-servlet" id="markdown-toc-rest-over-servlet">REST over Servlet</a> <ul>
+ <li><a href="#配置说明" id="markdown-toc-配置说明">配置说明</a></li>
+ <li><a href="#示例代码" id="markdown-toc-示例代码">示例代码</a></li>
+ </ul>
+ </li>
+ <li><a href="#rest-over-vertx" id="markdown-toc-rest-over-vertx">REST over Vertx</a> <ul>
+ <li><a href="#配置说明-1" id="markdown-toc-配置说明-1">配置说明</a></li>
+ <li><a href="#示例代码-1" id="markdown-toc-示例代码-1">示例代码</a></li>
+ </ul>
+ </li>
+ <li><a href="#highway-rpc协议" id="markdown-toc-highway-rpc协议">Highway RPC协议</a> <ul>
+ <li><a href="#概念阐述-2" id="markdown-toc-概念阐述-2">概念阐述</a></li>
+ <li><a href="#配置说明-2" id="markdown-toc-配置说明-2">配置说明</a></li>
+ <li><a href="#示例代码-2" id="markdown-toc-示例代码-2">示例代码</a></li>
+ </ul>
+ </li>
+</ul>
+
+ </nav>
+</aside>
+
+<h2 id="通信协议">通信协议</h2>
+<h3 id="概念阐述">概念阐述</h3>
+
+<p>ServiceComb实现了两种网络通道,包括REST和Highway,均支持TLS加密传输。其中,REST网络通道将服务以标准RESTful形式发布,调用端兼容直接使用http client使用标准RESTful形式进行调用。</p>
+
+<h3 id="注意事项">注意事项</h3>
+
+<p>参数和返回值的序列化:</p>
+
+<p>当前REST通道的body参数只支持application/json序列化方式,如果要向服务端发送form类型的参数,那么需要在调用端构造好application/json格式的body,不能直接以multipart/form-data格式传递form类型参数。</p>
+
+<p>当前REST通道返回值支持application/json和text/plain两种格式,服务提供者通过produces声明可提供序列化能力,服务消费者通过请求的Accept头指明返回值序列化方式,默认返回application/json格式的数据。</p>
+
+<h2 id="线程模型">线程模型</h2>
+<h3 id="概念阐述-1">概念阐述</h3>
+
+<p>本小节主要介绍ServiceComb微服务的完整线程模型,介绍IO线程和业务线程之间的关系</p>
+
+<h3 id="完整线程">完整线程</h3>
+
+<p>ServicecComb微服务的完整线程模型如下图所示:</p>
+
+<p><img src="/assets/images/thread-model.png" alt="" /></p>
+
+<blockquote>
+ <ol>
+ <li>业务线程在第一次调用时会绑定某一个网络线程,避免在不同网络线程之间切换,无谓地增加线程冲突的概率</li>
+ <li>业务线程绑定网络线程后,会再绑定该网络线程内部的某个连接,同样是为了避免线程冲突</li>
+ </ol>
+</blockquote>
+
+<ul>
+ <li>客户端和服务器都可以配置多个网络线程(eventloop),默认为CPU核数的两倍,每个网络线程可以配置多个连接,默认为1,支持Rest和Highway两种网络通道,具体配置请查看如下章节:
+ <ul>
+ <li><a href="/cn/users/communicate-protocol#rest-over-servlet">REST over Servlet</a></li>
+ <li><a href="/cn/users/communicate-protocol/#rest-over-vertx">REST over Vertx</a></li>
+ <li><a href="/cn/users/communicate-protocol/#highway-rpc协议">Highway RPC协议</a></li>
+ </ul>
+ </li>
+ <li>客户端可配置业务线程池executor,线程粒度可细化至schemaId:operation,配置如下:</li>
+</ul>
+
+<p>在microservice.yaml中添加executors配置,为schemaId:operation配置单独的业务线程池:</p>
+
+<div class="language-yaml highlighter-rouge"><pre class="highlight"><code><span class="s">cse</span><span class="pi">:</span>
+ <span class="s">executors</span><span class="pi">:</span>
+ <span class="s">Provider</span><span class="pi">:</span>
+ <span class="pi">[</span><span class="nv">schemaId</span><span class="pi">]</span><span class="s">.[operation]</span>
+</code></pre>
+</div>
+
+<h2 id="rest-over-servlet">REST over Servlet</h2>
+<h3 id="配置说明">配置说明</h3>
+
+<p> REST over Servlet对应使用web容器模式部署运行,需要新建一个servlet工程将微服务包装起来,加载到web容器中启动运行,包装微服务的方法有两种,一种完全使用web.xml配置文件配置,另一种仅在web.xml文件中配置listener,在microservice.yaml文件中配置urlPattern,两种方式如下所示:</p>
+
+<ul>
+ <li>
+ <p>在web.xml文件中完成全部配置</p>
+
+ <p>web.xml文件配置在项目的src/main/webapp/WEB_INF目录,配置内容如下:</p>
+
+ <div class="language-xml highlighter-rouge"><pre class="highlight"><code> <span class="nt"><web-app</span> <span class="na">xmlns=</span><span class="s">"http://java.sun.com/xml/ns/javaee"</span> <span class="na">xmlns:xsi=</span><span class="s">"http://www.w3.org/2001/XMLSchema-instance"</span> <span class="na">xsi:schemaLocation=</span><span class="s">"http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"</span> <span class="na">version=</span><span class="s">"3.0"</span><span class="nt">></span>
+ <span class="nt"><context-param></span>
+ <span class="nt"><param-name></span>contextConfigLocation<span class="nt"></param-name></span>
+ <span class="nt"><param-value></span>classpath*:META-INF/spring/*.bean.xml classpath*:app-config.xml<span class="nt"></param-value></span>
+ <span class="nt"></context-param></span>
+ <span class="nt"><listener></span>
+ <span class="nt"><listener-class></span>io.servicecomb.transport.rest.servlet.RestServletContextListener<span class="nt"></listener-class></span>
+ <span class="nt"></listener></span>
+ <span class="nt"><servlet></span>
+ <span class="nt"><servlet-name></span>RestServlet<span class="nt"></servlet-name></span>
+ <span class="nt"><servlet-class></span>io.servicecomb.transport.rest.servlet.RestServlet<span class="nt"></servlet-class></span>
+ <span class="nt"><load-on-startup></span>1<span class="nt"></load-on-startup></span>
+ <span class="nt"><async-supported></span>true<span class="nt"></async-supported></span>
+ <span class="nt"></servlet></span>
+ <span class="nt"><servlet-mapping></span>
+ <span class="nt"><servlet-name></span>RestServlet<span class="nt"></servlet-name></span>
+ <span class="nt"><url-pattern></span>/rest/*<span class="nt"></url-pattern></span>
+ <span class="nt"></servlet-mapping></span>
+ <span class="nt"></web-app></span>
+</code></pre>
+ </div>
+ </li>
+ <li>
+ <p>在web.xml文件中仅配置listener,在microservice.yaml文件中配置urlPattern</p>
+
+ <div class="language-xml highlighter-rouge"><pre class="highlight"><code> <span class="nt"><web-app</span> <span class="na">xmlns=</span><span class="s">"http://java.sun.com/xml/ns/javaee"</span> <span class="na">xmlns:xsi=</span><span class="s">"http://www.w3.org/2001/XMLSchema-instance"</span> <span class="na">xsi:schemaLocation=</span><span class="s">"http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"</span> <span class="na">version=</span><span class="s">"3.0"</span><span class="nt">></span>
+ <span class="nt"><context-param></span>
+ <span class="nt"><param-name></span>contextConfigLocation<span class="nt"></param-name></span>
+ <span class="nt"><param-value></span>classpath*:META-INF/spring/*.bean.xml classpath*:app-config.xml<span class="nt"></param-value></span>
+ <span class="nt"></context-param></span>
+ <span class="nt"><listener></span>
+ <span class="nt"><listener-class></span>io.servicecomb.transport.rest.servlet.RestServletContextListener<span class="nt"></listener-class></span>
+ <span class="nt"></listener></span>
+ <span class="nt"></web-app></span>
+</code></pre>
+ </div>
+
+ <p>在microservice.yaml文件中需要增加一行配置来指定urlPattern:</p>
+
+ <div class="language-yaml highlighter-rouge"><pre class="highlight"><code> <span class="s">servicecomb.rest.servlet.urlPattern</span><span class="pi">:</span> <span class="s">/rest/*</span>
+</code></pre>
+ </div>
+ </li>
+</ul>
+
+<p>以上两种方式是等效的,两种方式都需要在maven pom文件中添加如下依赖:</p>
+
+<div class="language-xml highlighter-rouge"><pre class="highlight"><code><span class="nt"><dependency></span>
+ <span class="nt"><groupId></span>io.servicecomb<span class="nt"></groupId></span>
+ <span class="nt"><artifactId></span>transport-rest-servlet<span class="nt"></artifactId></span>
+<span class="nt"></dependency></span>
+</code></pre>
+</div>
+
+<p>REST over Servlet在microservice.yaml文件中的配置项见下表:</p>
+
+<p>表1 REST over Servlet配置项说明</p>
+
+<table>
+ <thead>
+ <tr>
+ <th style="text-align: left">配置项</th>
+ <th style="text-align: left">默认值</th>
+ <th style="text-align: left">取值范围</th>
+ <th style="text-align: left">是否必选</th>
+ <th style="text-align: left">含义</th>
+ <th style="text-align: left">注意</th>
+ </tr>
+ </thead>
+ <tbody>
+ <tr>
+ <td style="text-align: left">cse.rest.address</td>
+ <td style="text-align: left">0.0.0.0:8080</td>
+ <td style="text-align: left">-</td>
+ <td style="text-align: left">否</td>
+ <td style="text-align: left">服务监听地址</td>
+ <td style="text-align: left">-</td>
+ </tr>
+ <tr>
+ <td style="text-align: left">cse.rest.timeout</td>
+ <td style="text-align: left">3000</td>
+ <td style="text-align: left">-</td>
+ <td style="text-align: left">否</td>
+ <td style="text-align: left">超时时间</td>
+ <td style="text-align: left">单位为毫秒</td>
+ </tr>
+ <tr>
+ <td style="text-align: left">cse.request.timeout</td>
+ <td style="text-align: left">30000</td>
+ <td style="text-align: left">-</td>
+ <td style="text-align: left">否</td>
+ <td style="text-align: left">请求超时时间</td>
+ <td style="text-align: left">同REST over Vertx的配置</td>
+ </tr>
+ <tr>
+ <td style="text-align: left">cse.references.[服务名].transport</td>
+ <td style="text-align: left">rest</td>
+ <td style="text-align: left"> </td>
+ <td style="text-align: left">否</td>
+ <td style="text-align: left">访问的transport类型</td>
+ <td style="text-align: left">同REST over Vertx的配置</td>
+ </tr>
+ <tr>
+ <td style="text-align: left">cse.references.[服务名].version-rule</td>
+ <td style="text-align: left">latest</td>
+ <td style="text-align: left">-</td>
+ <td style="text-align: left">否</td>
+ <td style="text-align: left">访问实例的版本号</td>
+ <td style="text-align: left">同REST over Vertx的配置</td>
+ </tr>
+ </tbody>
+</table>
+
+<h3 id="示例代码">示例代码</h3>
+
+<p>microservice.yaml文件中的配置示例如下:</p>
+
+<div class="language-yaml highlighter-rouge"><pre class="highlight"><code><span class="s">cse</span><span class="pi">:</span>
+ <span class="s">rest</span><span class="pi">:</span>
+ <span class="s">address</span><span class="pi">:</span> <span class="s">0.0.0.0:8080</span>
+ <span class="s">timeout</span><span class="pi">:</span> <span class="s">3000</span>
+</code></pre>
+</div>
+
+<h2 id="rest-over-vertx">REST over Vertx</h2>
+<h3 id="配置说明-1">配置说明</h3>
+
+<p>REST over Vertx通信通道对应使用standalone部署运行模式,可直接通过main函数拉起。main函数中需要初始化日志和加载服务配置,代码如下:</p>
+
+<div class="language-java highlighter-rouge"><pre class="highlight"><code><span class="kn">import</span> <span class="nn">io.servicecomb.foundation.common.utils.BeanUtils</span><span class="o">;</span>
+<span class="kn">import</span> <span class="nn">io.servicecomb.foundation.common.utils.Log4jUtils</span><span class="o">;</span>
+
+<span class="kd">public</span> <span class="kd">class</span> <span class="nc">MainServer</span> <span class="o">{</span>
+ <span class="kd">public</span> <span class="kd">static</span> <span class="kt">void</span> <span class="nf">main</span><span class="o">(</span><span class="n">String</span><span class="o">[]</span> <span class="n">args</span><span class="o">)</span> <span class="kd">throws</span> <span class="n">Exception</span> <span class="o">{</span>
+ <span class="err"> </span><span class="n">Log4jUtils</span><span class="o">.</span><span class="na">init</span><span class="o">();</span><span class="c1">//日志初始化</span>
+ <span class="err"> </span><span class="n">BeanUtils</span><span class="o">.</span><span class="na">init</span><span class="o">();</span> <span class="c1">// Spring bean初始化</span>
+ <span class="o">}</span>
+<span class="o">}</span>
+</code></pre>
+</div>
+
+<p>使用REST over Vertx网络通道需要在maven pom文件中添加如下依赖:</p>
+
+<div class="language-xml highlighter-rouge"><pre class="highlight"><code><span class="nt"><dependency></span>
+ <span class="nt"><groupId></span>io.servicecomb<span class="nt"></groupId></span>
+ <span class="nt"><artifactId></span>transport-rest-vertx<span class="nt"></artifactId></span>
+<span class="nt"></dependency></span>
+</code></pre>
+</div>
+
+<p>REST over Vertx通道在microservice.yaml文件中有以下配置项:</p>
+
+<p>表2 REST over Vertx配置项说明</p>
+
+<table>
+ <thead>
+ <tr>
+ <th style="text-align: left">配置项</th>
+ <th style="text-align: left">默认值</th>
+ <th style="text-align: left">取值范围</th>
+ <th style="text-align: left">是否必选</th>
+ <th style="text-align: left">含义</th>
+ <th style="text-align: left">注意</th>
+ </tr>
+ </thead>
+ <tbody>
+ <tr>
+ <td style="text-align: left">cse.rest.address</td>
+ <td style="text-align: left">0.0.0.0:8080</td>
+ <td style="text-align: left">-</td>
+ <td style="text-align: left">否</td>
+ <td style="text-align: left">服务监听地址</td>
+ <td style="text-align: left">仅服务提供者需要配置</td>
+ </tr>
+ <tr>
+ <td style="text-align: left">cse.rest.server.thread-count</td>
+ <td style="text-align: left">1</td>
+ <td style="text-align: left">-</td>
+ <td style="text-align: left">否</td>
+ <td style="text-align: left">服务端线程数</td>
+ <td style="text-align: left">仅服务提供者需要配置</td>
+ </tr>
+ <tr>
+ <td style="text-align: left">cse.rest.client.thread-count</td>
+ <td style="text-align: left">1</td>
+ <td style="text-align: left">-</td>
+ <td style="text-align: left">否</td>
+ <td style="text-align: left">客户端网络线程数</td>
+ <td style="text-align: left">仅服务消费者需要配置</td>
+ </tr>
+ <tr>
+ <td style="text-align: left">cse.rest.client.connection-pool-per-thread</td>
+ <td style="text-align: left">1</td>
+ <td style="text-align: left">-</td>
+ <td style="text-align: left">否</td>
+ <td style="text-align: left">客户端每个网络线程中的连接池的个数</td>
+ <td style="text-align: left">仅服务消费者需要配置</td>
+ </tr>
+ <tr>
+ <td style="text-align: left">cse.request.timeout</td>
+ <td style="text-align: left">30000</td>
+ <td style="text-align: left">-</td>
+ <td style="text-align: left">否</td>
+ <td style="text-align: left">请求超时时间</td>
+ <td style="text-align: left"> </td>
+ </tr>
+ <tr>
+ <td style="text-align: left">cse.references.[服务名].transport</td>
+ <td style="text-align: left">rest</td>
+ <td style="text-align: left"> </td>
+ <td style="text-align: left">否</td>
+ <td style="text-align: left">访问的transport类型</td>
+ <td style="text-align: left">仅服务消费者需要配置</td>
+ </tr>
+ <tr>
+ <td style="text-align: left">cse.references.[服务名].version-rule</td>
+ <td style="text-align: left">latest</td>
+ <td style="text-align: left">-</td>
+ <td style="text-align: left">否</td>
+ <td style="text-align: left">访问实例的版本号</td>
+ <td style="text-align: left">仅服务消费者需要配置支持latest,1.0.0+,1.0.0-2.0.2,精确版本。详细参考服务中心的接口描述。</td>
+ </tr>
+ </tbody>
+</table>
+
+<h3 id="示例代码-1">示例代码</h3>
+
+<p>microservice.yaml文件中的配置示例:</p>
+
+<div class="language-yaml highlighter-rouge"><pre class="highlight"><code><span class="s">cse</span><span class="pi">:</span>
+ <span class="s">rest</span><span class="pi">:</span>
+ <span class="s">address</span><span class="pi">:</span> <span class="s">0.0.0.0:8080</span>
+ <span class="s">thread-count</span><span class="pi">:</span> <span class="s">1</span>
+ <span class="s">references</span><span class="pi">:</span>
+ <span class="s">hello</span><span class="pi">:</span>
+ <span class="s">transport</span><span class="pi">:</span> <span class="s">rest</span>
+ <span class="s">version-rule</span><span class="pi">:</span> <span class="s">0.0.1</span>
+</code></pre>
+</div>
+
+<h2 id="highway-rpc协议">Highway RPC协议</h2>
+<h3 id="概念阐述-2">概念阐述</h3>
+
+<p>Highway是ServiceComb的高性能私有协议,用户可在有特殊性能需求的场景下选用。</p>
+
+<h3 id="配置说明-2">配置说明</h3>
+
+<p>使用Highway网络通道需要在maven pom文件中添加如下依赖:</p>
+
+<div class="language-xml highlighter-rouge"><pre class="highlight"><code><span class="nt"><dependency></span>
+ <span class="nt"><groupId></span>io.servicecomb<span class="nt"></groupId></span>
+ <span class="nt"><artifactId></span>transport-highway<span class="nt"></artifactId></span>
+<span class="nt"></dependency></span>
+</code></pre>
+</div>
+
+<p>Highway通道在microservice.yaml文件中的配置项如下表所示:</p>
+
+<p>表3 Highway配置项说明</p>
+
+<table>
+ <thead>
+ <tr>
+ <th style="text-align: left">配置项</th>
+ <th style="text-align: left">默认值</th>
+ <th style="text-align: left">取值范围</th>
+ <th style="text-align: left">是否必选</th>
+ <th style="text-align: left">含义</th>
+ <th style="text-align: left">注意</th>
+ </tr>
+ </thead>
+ <tbody>
+ <tr>
+ <td style="text-align: left">cse.highway.address</td>
+ <td style="text-align: left">0.0.0.0:7070</td>
+ <td style="text-align: left">-</td>
+ <td style="text-align: left">否</td>
+ <td style="text-align: left">服务监听地址</td>
+ <td style="text-align: left">-</td>
+ </tr>
+ <tr>
+ <td style="text-align: left">cse.highway.server.thread-count</td>
+ <td style="text-align: left">1</td>
+ <td style="text-align: left">-</td>
+ <td style="text-align: left">否</td>
+ <td style="text-align: left">服务端网络线程个数</td>
+ <td style="text-align: left">-</td>
+ </tr>
+ <tr>
+ <td style="text-align: left">cse.highway.client.thread-count</td>
+ <td style="text-align: left">1</td>
+ <td style="text-align: left">-</td>
+ <td style="text-align: left">否</td>
+ <td style="text-align: left">客户端网络线程个数</td>
+ <td style="text-align: left">-</td>
+ </tr>
+ <tr>
+ <td style="text-align: left">cse.highway.client.connection-pool-per-thread</td>
+ <td style="text-align: left">1</td>
+ <td style="text-align: left">-</td>
+ <td style="text-align: left">否</td>
+ <td style="text-align: left">客户端每个网络线程的连接池个数</td>
+ <td style="text-align: left">-</td>
+ </tr>
+ <tr>
+ <td style="text-align: left">cse.request.timeout</td>
+ <td style="text-align: left">30000</td>
+ <td style="text-align: left">-</td>
+ <td style="text-align: left">否</td>
+ <td style="text-align: left">请求超时时间</td>
+ <td style="text-align: left">同REST over Vertx的配置</td>
+ </tr>
+ <tr>
+ <td style="text-align: left">cse.references.[服务名].transport</td>
+ <td style="text-align: left">rest</td>
+ <td style="text-align: left"> </td>
+ <td style="text-align: left">否</td>
+ <td style="text-align: left">访问的transport类型</td>
+ <td style="text-align: left">同REST over Vertx的配置</td>
+ </tr>
+ <tr>
+ <td style="text-align: left">cse.references.[服务名].version-rule</td>
+ <td style="text-align: left">latest</td>
+ <td style="text-align: left">-</td>
+ <td style="text-align: left">否</td>
+ <td style="text-align: left">访问实例的版本号</td>
+ <td style="text-align: left">同REST over Vertx的配置</td>
+ </tr>
+ </tbody>
+</table>
+
+<h3 id="示例代码-2">示例代码</h3>
+
+<p>microservice.yaml文件中的配置示例:</p>
+
+<div class="language-yaml highlighter-rouge"><pre class="highlight"><code><span class="s">cse</span><span class="pi">:</span>
+ <span class="s">highway</span><span class="pi">:</span>
+ <span class="s">address</span><span class="pi">:</span> <span class="s">0.0.0.0:7070</span>
+</code></pre>
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+ <meta itemprop="headline" content="自定义调用链打点">
+ <meta itemprop="description" content="自定义调用链打点">
+
+ <meta itemprop="dateModified" content="August 15, 2017">
+
+ <div class="page__inner-wrap">
+
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+ <header>
+ <h1 class="page__title" itemprop="headline">自定义调用链打点
+</h1>
+
+ </header>
+
+
+
+ <section class="page__content" itemprop="text">
+ <aside class="sidebar__right">
+<nav class="toc">
+ <!-- <header><h4 class="nav__title"><i class="fa fa-file-text"></i> 在本页上</h4></header> -->
+<ul class="toc__menu" id="markdown-toc">
+ <li><a href="#概念阐述" id="markdown-toc-概念阐述">概念阐述</a></li>
+ <li><a href="#前提条件" id="markdown-toc-前提条件">前提条件</a></li>
+ <li><a href="#注意事项" id="markdown-toc-注意事项">注意事项</a></li>
+ <li><a href="#自定义调用链打点" id="markdown-toc-自定义调用链打点">自定义调用链打点</a></li>
+ <li><a href="#使用步骤" id="markdown-toc-使用步骤">使用步骤:</a> <ul>
+ <li><a href="#添加依赖" id="markdown-toc-添加依赖">添加依赖</a></li>
+ <li><a href="#启用自定义打点功能" id="markdown-toc-启用自定义打点功能">启用自定义打点功能</a></li>
+ <li><a href="#定制打点" id="markdown-toc-定制打点">定制打点</a></li>
+ </ul>
+ </li>
+ <li><a href="#定制上报的数据" id="markdown-toc-定制上报的数据">定制上报的数据</a></li>
+</ul>
+
+ </nav>
+</aside>
+
+<h2 id="概念阐述">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="前提条件">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="注意事项">注意事项</h2>
+
+<ul>
+ <li>使用<code class="highlighter-rouge">@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 class="highlighter-rouge">@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="自定义调用链打点">自定义调用链打点</h2>
+
+<p>该功能集成了Zipkin,提供<code class="highlighter-rouge">@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 class="highlighter-rouge">@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="使用步骤">使用步骤:</h2>
+
+<h3 id="添加依赖">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>
+
+<div class="language-xml highlighter-rouge"><pre class="highlight"><code> <span class="nt"><dependency></span>
+ <span class="nt"><groupId></span>io.servicecomb<span class="nt"></groupId></span>
+ <span class="nt"><artifactId></span>tracing-zipkin<span class="nt"></artifactId></span>
+ <span class="nt"></dependency></span>
+</code></pre>
+</div>
+
+<h3 id="启用自定义打点功能">启用自定义打点功能</h3>
+
+<p>在应用入口或Spring配置类上添加<code class="highlighter-rouge">@EnableZipkinTracing</code>注释:</p>
+
+<div class="language-java highlighter-rouge"><pre class="highlight"><code><span class="nd">@SpringBootApplication</span>
+<span class="nd">@EnableZipkinTracing</span>
+<span class="kd">public</span> <span class="kd">class</span> <span class="nc">ZipkinSpanTestApplication</span> <span class="o">{</span>
+ <span class="kd">public</span> <span class="kd">static</span> <span class="kt">void</span> <span class="nf">main</span><span class="o">(</span><span class="n">String</span><span class="o">[]</span> <span class="n">args</span><span class="o">)</span> <span class="o">{</span>
+ <span class="n">SpringApplication</span><span class="o">.</span><span class="na">run</span><span class="o">(</span><span class="n">ZipkinSpanTestApplication</span><span class="o">.</span><span class="na">class</span><span class="o">);</span>
+ <span class="o">}</span>
+<span class="o">}</span>
+</code></pre>
+</div>
+
+<h3 id="定制打点">定制打点</h3>
+
+<p>在需要定制打点的方法上添加<code class="highlighter-rouge">@Span</code>注释:</p>
+
+<div class="language-java highlighter-rouge"><pre class="highlight"><code><span class="nd">@Component</span>
+<span class="kd">public</span> <span class="kd">class</span> <span class="nc">SlowRepoImpl</span> <span class="kd">implements</span> <span class="n">SlowRepo</span> <span class="o">{</span>
+ <span class="kd">private</span> <span class="kd">static</span> <span class="kd">final</span> <span class="n">Logger</span> <span class="n">logger</span> <span class="o">=</span> <span class="n">LoggerFactory</span><span class="o">.</span><span class="na">getLogger</span><span class="o">(</span><span class="n">SlowRepoImpl</span><span class="o">.</span><span class="na">class</span><span class="o">);</span>
+
+ <span class="kd">private</span> <span class="kd">final</span> <span class="n">Random</span> <span class="n">random</span> <span class="o">=</span> <span class="k">new</span> <span class="n">Random</span><span class="o">();</span>
+
+ <span class="nd">@Span</span>
+ <span class="nd">@Override</span>
+ <span class="kd">public</span> <span class="n">String</span> <span class="nf">crawl</span><span class="o">()</span> <span class="kd">throws</span> <span class="n">InterruptedException</span> <span class="o">{</span>
+ <span class="n">logger</span><span class="o">.</span><span class="na">info</span><span class="o">(</span><span class="s">"in /crawl"</span><span class="o">);</span>
+ <span class="n">Thread</span><span class="o">.</span><span class="na">sleep</span><span class="o">(</span><span class="n">random</span><span class="o">.</span><span class="na">nextInt</span><span class="o">(</span><span class="mi">200</span><span class="o">));</span>
+ <span class="k">return</span> <span class="s">"crawled"</span><span class="o">;</span>
+ <span class="o">}</span>
+<span class="o">}</span>
+</code></pre>
+</div>
+
+<p>就这样,通过使用<code class="highlighter-rouge">@Span</code>注释,我们启动了基于 Zipkin 的自定义打点功能。</p>
+
+<h2 id="定制上报的数据">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 class="highlighter-rouge">SlowRepoImp</code>里上报的数据如下:</p>
+
+<table>
+ <thead>
+ <tr>
+ <th style="text-align: left">key</th>
+ <th style="text-align: left">value</th>
+ </tr>
+ </thead>
+ <tbody>
+ <tr>
+ <td style="text-align: left">span name</td>
+ <td style="text-align: left">crawl</td>
+ </tr>
+ <tr>
+ <td style="text-align: left">call.path</td>
+ <td style="text-align: left">public abstract java.lang.String io.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>
+
+<div class="language-java highlighter-rouge"><pre class="highlight"><code> <span class="kd">public</span> <span class="kd">static</span> <span class="kd">class</span> <span class="nc">CustomSpanTask</span> <span class="o">{</span>
+ <span class="nd">@Span</span><span class="o">(</span><span class="n">spanName</span> <span class="o">=</span> <span class="s">"transaction1"</span><span class="o">,</span> <span class="n">callPath</span> <span class="o">=</span> <span class="s">"startA"</span><span class="o">)</span>
+ <span class="kd">public</span> <span class="n">String</span> <span class="nf">invoke</span><span class="o">()</span> <span class="o">{</span>
+ <span class="k">return</span> <span class="s">"invoke the method"</span><span class="o">;</span>
+ <span class="o">}</span>
+ <span class="o">}</span>
+</code></pre>
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