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<div class="section" id="groovy">
<h1>groovy<a class="headerlink" href="#groovy" title="永久链接至标题">¶</a></h1>
<blockquote>
<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>
</div></blockquote>
<div class="section" id="id1">
<h2>限制内容<a class="headerlink" href="#id1" title="永久链接至标题">¶</a></h2>
<ol class="simple">
<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>
<li><p>只允许在方法的 before/success/exception/finish 四个环节进行监听。</p></li>
</ol>
</div>
<div class="section" id="id2">
<h2>参数说明<a class="headerlink" href="#id2" title="永久链接至标题">¶</a></h2>
<table border="1" class="docutils">
<thead>
<tr>
<th align="right">参数名称</th>
<th align="left">参数说明</th>
</tr>
</thead>
<tbody>
<tr>
<td align="right"><em>class-pattern</em></td>
<td align="left">类名表达式匹配</td>
</tr>
<tr>
<td align="right"><em>method-pattern</em></td>
<td align="left">方法名表达式匹配</td>
</tr>
<tr>
<td align="right"><em>script-filepath</em></td>
<td align="left">groovy 脚本的绝对路径</td>
</tr>
<tr>
<td align="right">[S]</td>
<td align="left">匹配所有的子类</td>
</tr>
<tr>
<td align="right">[E]</td>
<td align="left">开启正则表达式匹配，默认为通配符匹配</td>
</tr>
</tbody>
</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>
</div>
<div class="section" id="id3">
<h2>五个关键函数声明<a class="headerlink" href="#id3" title="永久链接至标题">¶</a></h2>
<div class="highlight-java notranslate"><div class="highlight hljs"><pre class="java">/**
* 增强脚本监听器
*/
interface ScriptListener {
/**
* 脚本创建
*
* @param output 输出器
*/
void create(Output output);
/**
* 脚本销毁
*
* @param output 输出器
*/
void destroy(Output output);
/**
* 方法执行前
*
* @param output 输出器
* @param advice 通知点
*/
void before(Output output, Advice advice);
/**
* 方法正常返回
*
* @param output 输出器
* @param advice 通知点
*/
void afterReturning(Output output, Advice advice);
/**
* 方法异常返回
*
* @param output 输出器
* @param advice 通知点
*/
void afterThrowing(Output output, Advice advice);
}</pre></div>
</div>
</div>
<div class="section" id="advice">
<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>
<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>
</div>
<div class="section" id="output">
<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>
<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>
<div class="highlight-java notranslate"><div class="highlight hljs"><pre class="java">/**
* 输出器
*/
interface Output {
/**
* 输出字符串(不换行)
*
* @param string 待输出字符串
* @return this
*/
Output print(String string);
/**
* 输出字符串(换行)
*
* @param string 待输出字符串
* @return this
*/
Output println(String string);
/**
* 结束当前脚本
*
* @return this
*/
Output finish();
}</pre></div>
</div>
</div>
<div class="section" id="id4">
<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>
<div class="highlight-groovy notranslate"><div class="highlight hljs"><pre class="groovy">import com.taobao.arthas.core.command.ScriptSupportCommand
import com.taobao.arthas.core.util.Advice
import static java.lang.String.format
/**
* 输出方法日志
*/
public class Logger implements ScriptSupportCommand.ScriptListener {
@Override
void create(ScriptSupportCommand.Output output) {
output.println("script create.");
}
@Override
void destroy(ScriptSupportCommand.Output output) {
output.println("script destroy.");
}
@Override
void before(ScriptSupportCommand.Output output, Advice advice) {
output.println(format("before:class=%s;method=%s;paramslen=%d;%s;",
advice.getClazz().getSimpleName(),
advice.getMethod().getName(),
advice.getParams().length, advice.getParams()))
}
@Override
void afterReturning(ScriptSupportCommand.Output output, Advice advice) {
output.println(format("returning:class=%s;method=%s;",
advice.getClazz().getSimpleName(),
advice.getMethod().getName()))
}
@Override
void afterThrowing(ScriptSupportCommand.Output output, Advice advice) {
output.println(format("throwing:class=%s;method=%s;",
advice.getClazz().getSimpleName(),
advice.getMethod().getName()))
}
}</pre></div>
</div>
<p>使用示例：</p>
<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
script create.
Press Ctrl+C to abort.
Affect(class-cnt:1 , method-cnt:1) cost in 102 ms.
before:class=IbatisProductDao;method=getProductById;paramslen=1;[Ljava.lang.Object;@45df64fc;
returning:class=IbatisProductDao;method=getProductById;
before:class=IbatisProductDao;method=getProductById;paramslen=1;[Ljava.lang.Object;@5b0e2d00;
returning:class=IbatisProductDao;method=getProductById;</pre>
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