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3.3.4
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<a href="https://github.com/alibaba/arthas/blob/master/site/src/site/sphinx/groovy.md" class="fa fa-github"> Edit on GitHub</a>
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<div class="section" id="groovy">
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<h1>groovy<a class="headerlink" href="#groovy" title="永久链接至标题">¶</a></h1>
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<blockquote>
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<div><p>Arthas 支持 groovy 脚本增强，允许像 BTrace 一样编写脚本来解决问题，可以在 groovy 脚本中进行if/for/switch/while 等控制语句，不受限制，但相比 BTrace 而言拥有更多的限制范围。</p>
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</div></blockquote>
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<div class="section" id="id1">
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<h2>限制内容<a class="headerlink" href="#id1" title="永久链接至标题">¶</a></h2>
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<ol class="simple">
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<li><p>禁止改变原有逻辑，与 watch 等命令一样，重点保证的是监听和观察。</p></li>
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<li><p>只允许在方法的 before/success/exception/finish 四个环节进行监听。</p></li>
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</ol>
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</div>
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<div class="section" id="id2">
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<h2>参数说明<a class="headerlink" href="#id2" title="永久链接至标题">¶</a></h2>
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<table border="1" class="docutils">
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<thead>
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<tr>
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<th align="right">参数名称</th>
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<th align="left">参数说明</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td align="right"><em>class-pattern</em></td>
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<td align="left">类名表达式匹配</td>
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</tr>
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<tr>
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<td align="right"><em>method-pattern</em></td>
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<td align="left">方法名表达式匹配</td>
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</tr>
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<tr>
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<td align="right"><em>script-filepath</em></td>
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<td align="left">groovy 脚本的绝对路径</td>
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</tr>
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<tr>
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<td align="right">[S]</td>
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<td align="left">匹配所有的子类</td>
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</tr>
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<tr>
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<td align="right">[E]</td>
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<td align="left">开启正则表达式匹配，默认为通配符匹配</td>
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</tr>
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</tbody>
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</table><p>需要说明的是，第三个输入参数是脚本的绝对路径，比如 <code class="docutils literal notranslate"><span class="pre">/tmp/test.groovy</span></code>，不建议输入相对路径，比如 <code class="docutils literal notranslate"><span class="pre">./test.groovy</span></code></p>
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</div>
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<div class="section" id="id3">
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<h2>五个关键函数声明<a class="headerlink" href="#id3" title="永久链接至标题">¶</a></h2>
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<div class="highlight-java notranslate"><div class="highlight hljs"><pre class="java">/**
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* 增强脚本监听器
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*/
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interface ScriptListener {
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/**
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* 脚本创建
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*
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* @param output 输出器
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*/
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void create(Output output);
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/**
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* 脚本销毁
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*
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* @param output 输出器
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*/
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void destroy(Output output);
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/**
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* 方法执行前
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*
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* @param output 输出器
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* @param advice 通知点
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*/
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void before(Output output, Advice advice);
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/**
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* 方法正常返回
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*
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* @param output 输出器
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* @param advice 通知点
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*/
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void afterReturning(Output output, Advice advice);
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/**
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* 方法异常返回
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*
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* @param output 输出器
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* @param advice 通知点
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*/
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void afterThrowing(Output output, Advice advice);
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}</pre></div>
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</div>
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</div>
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<div class="section" id="advice">
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<h2>参数 <code class="docutils literal notranslate"><span class="pre">Advice</span></code> 说明<a class="headerlink" href="#advice" title="永久链接至标题">¶</a></h2>
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<p><code class="docutils literal notranslate"><span class="pre">Advice</span></code> 参数最主要是封装了通知节点的所有信息。参考<a class="reference internal" href="advice-class.html"><span class="doc">表达式核心变量</span></a>中关于该节点的描述。</p>
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</div>
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<div class="section" id="output">
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<h2>参数 <code class="docutils literal notranslate"><span class="pre">Output</span></code> 说明<a class="headerlink" href="#output" title="永久链接至标题">¶</a></h2>
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<p><code class="docutils literal notranslate"><span class="pre">Output</span></code> 参数只拥有三个方法，主要的工作还是输出对应的文本信息</p>
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<div class="highlight-java notranslate"><div class="highlight hljs"><pre class="java">/**
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* 输出器
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*/
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interface Output {
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/**
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* 输出字符串(不换行)
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*
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* @param string 待输出字符串
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* @return this
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*/
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Output print(String string);
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/**
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* 输出字符串(换行)
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*
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* @param string 待输出字符串
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* @return this
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*/
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Output println(String string);
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/**
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* 结束当前脚本
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*
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* @return this
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*/
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Output finish();
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}</pre></div>
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</div>
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</div>
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<div class="section" id="id4">
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<h2>一个输出日志的 groovy 脚本示例<a class="headerlink" href="#id4" title="永久链接至标题">¶</a></h2>
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<div class="highlight-groovy notranslate"><div class="highlight hljs"><pre class="groovy">import com.taobao.arthas.core.command.ScriptSupportCommand
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import com.taobao.arthas.core.util.Advice
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import static java.lang.String.format
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/**
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* 输出方法日志
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*/
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public class Logger implements ScriptSupportCommand.ScriptListener {
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@Override
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void create(ScriptSupportCommand.Output output) {
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output.println("script create.");
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}
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@Override
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void destroy(ScriptSupportCommand.Output output) {
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output.println("script destroy.");
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}
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@Override
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void before(ScriptSupportCommand.Output output, Advice advice) {
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output.println(format("before:class=%s;method=%s;paramslen=%d;%s;",
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advice.getClazz().getSimpleName(),
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advice.getMethod().getName(),
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advice.getParams().length, advice.getParams()))
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}
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@Override
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void afterReturning(ScriptSupportCommand.Output output, Advice advice) {
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output.println(format("returning:class=%s;method=%s;",
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advice.getClazz().getSimpleName(),
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advice.getMethod().getName()))
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}
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@Override
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void afterThrowing(ScriptSupportCommand.Output output, Advice advice) {
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output.println(format("throwing:class=%s;method=%s;",
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advice.getClazz().getSimpleName(),
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advice.getMethod().getName()))
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}
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}</pre></div>
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</div>
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<p>使用示例：</p>
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<div class="highlight-default notranslate"><pre class="literal-block">$ groovy com.alibaba.sample.petstore.dal.dao.ProductDao getProductById /Users/zhuyong/middleware/arthas/scripts/Logger.groovy -S
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script create.
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Press Ctrl+C to abort.
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Affect(class-cnt:1 , method-cnt:1) cost in 102 ms.
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before:class=IbatisProductDao;method=getProductById;paramslen=1;[Ljava.lang.Object;@45df64fc;
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returning:class=IbatisProductDao;method=getProductById;
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before:class=IbatisProductDao;method=getProductById;paramslen=1;[Ljava.lang.Object;@5b0e2d00;
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returning:class=IbatisProductDao;method=getProductById;</pre>
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</div>
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</div>
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</div>
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</div>
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<footer>
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<hr/>
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<div role="contentinfo">
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<p>
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© Copyright 2018-2020, Alibaba Middleware Group, and contributors
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</p>
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<div class="github-fork-ribbon-wrapper right">
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<div class="github-fork-ribbon">
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<a href="https://github.com/alibaba/arthas" target="_blank">Fork me at GitHub</a>
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hm.src = "https://hm.baidu.com/hm.js?ecc1b0d9aeb73da1671876133211d4d3";
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} else { // https://alibaba.github.io/arthas/
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