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viewbox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">在新窗口打开</span></span><!--[--><!--]--></a><!----></li><li><a href="/doc/contact-us.md" class="sidebar-item" aria-label="QQ群/钉钉群"><!--[--><!--]--> QQ群/钉钉群 <!--[--><!--]--></a><!----></li><!--]--></ul></li><!--]--></ul><!--[--><!--]--></aside><!--]--><!--[--><main class="page" data-v-fdd717e0><!--[--><!--]--><div class="right-menu-padding theme-default-content" data-v-fdd717e0><!--[--><!--]--><div class="right-menu-wrapper" data-v-fdd717e0 data-v-2b64a081><div class="right-menu-margin" data-v-2b64a081><div class="right-menu-title" data-v-2b64a081>目录</div><div class="right-menu-content" data-v-2b64a081><!--[--><!--]--></div></div></div><div data-v-fdd717e0><h1 id="watch" tabindex="-1"><a class="header-anchor" href="#watch" aria-hidden="true">#</a> watch</h1><p><a href="https://arthas.aliyun.com/doc/arthas-tutorials.html?language=cn&id=command-watch" target="_blank" rel="noopener noreferrer"><code>watch</code>在线教程<span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewbox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">在新窗口打开</span></span></a></p><div class="custom-container tip"><p class="custom-container-title">提示</p><p>函数执行数据观测</p></div><p>让你能方便的观察到指定函数的调用情况。能观察到的范围为：<code>返回值</code>、<code>抛出异常</code>、<code>入参</code>，通过编写 OGNL 表达式进行对应变量的查看。</p><h2 id="参数说明" tabindex="-1"><a class="header-anchor" href="#参数说明" aria-hidden="true">#</a> 参数说明</h2><p>watch 的参数比较多，主要是因为它能在 4 个不同的场景观察对象</p><table><thead><tr><th style="text-align:right;">参数名称</th><th style="text-align:left;">参数说明</th></tr></thead><tbody><tr><td style="text-align:right;"><em>class-pattern</em></td><td style="text-align:left;">类名表达式匹配</td></tr><tr><td style="text-align:right;"><em>method-pattern</em></td><td style="text-align:left;">函数名表达式匹配</td></tr><tr><td style="text-align:right;"><em>express</em></td><td style="text-align:left;">观察表达式，默认值：<code>{params, target, returnObj}</code></td></tr><tr><td style="text-align:right;"><em>condition-express</em></td><td style="text-align:left;">条件表达式</td></tr><tr><td style="text-align:right;">[b]</td><td style="text-align:left;">在<strong>函数调用之前</strong>观察</td></tr><tr><td style="text-align:right;">[e]</td><td style="text-align:left;">在<strong>函数异常之后</strong>观察</td></tr><tr><td style="text-align:right;">[s]</td><td style="text-align:left;">在<strong>函数返回之后</strong>观察</td></tr><tr><td style="text-align:right;">[f]</td><td style="text-align:left;">在<strong>函数结束之后</strong>(正常返回和异常返回)观察</td></tr><tr><td style="text-align:right;">[E]</td><td style="text-align:left;">开启正则表达式匹配，默认为通配符匹配</td></tr><tr><td style="text-align:right;">[x:]</td><td style="text-align:left;">指定输出结果的属性遍历深度，默认为 1，最大值是 4</td></tr></tbody></table><p>这里重点要说明的是观察表达式，观察表达式的构成主要由 ognl 表达式组成，所以你可以这样写<code>"{params,returnObj}"</code>，只要是一个合法的 ognl 表达式，都能被正常支持。</p><p>观察的维度也比较多，主要体现在参数 <code>advice</code> 的数据结构上。<code>Advice</code> 参数最主要是封装了通知节点的所有信息。请参考<a href="/doc/advice-class.html" class="">表达式核心变量</a>中关于该节点的描述。</p><ul><li>特殊用法请参考：<a href="https://github.com/alibaba/arthas/issues/71" target="_blank" rel="noopener noreferrer">https://github.com/alibaba/arthas/issues/71<span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewbox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">在新窗口打开</span></span></a></li><li>OGNL 表达式官网：<a href="https://commons.apache.org/proper/commons-ognl/language-guide.html" target="_blank" rel="noopener noreferrer">https://commons.apache.org/proper/commons-ognl/language-guide.html<span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewbox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">在新窗口打开</span></span></a></li></ul><p><strong>特别说明</strong>：</p><ul><li>watch 命令定义了 4 个观察事件点，即 <code>-b</code> 函数调用前，<code>-e</code> 函数异常后，<code>-s</code> 函数返回后，<code>-f</code> 函数结束后</li><li>4 个观察事件点 <code>-b</code>、<code>-e</code>、<code>-s</code> 默认关闭，<code>-f</code> 默认打开，当指定观察点被打开后，在相应事件点会对观察表达式进行求值并输出</li><li>这里要注意<code>函数入参</code>和<code>函数出参</code>的区别，有可能在中间被修改导致前后不一致，除了 <code>-b</code> 事件点 <code>params</code> 代表函数入参外，其余事件都代表函数出参</li><li>当使用 <code>-b</code> 时，由于观察事件点是在函数调用前，此时返回值或异常均不存在</li><li>在 watch 命令的结果里，会打印出<code>location</code>信息。<code>location</code>有三种可能值：<code>AtEnter</code>，<code>AtExit</code>，<code>AtExceptionExit</code>。对应函数入口，函数正常 return，函数抛出异常。</li></ul><h2 id="使用参考" tabindex="-1"><a class="header-anchor" href="#使用参考" aria-hidden="true">#</a> 使用参考</h2><h3 id="启动-demo" tabindex="-1"><a class="header-anchor" href="#启动-demo" aria-hidden="true">#</a> 启动 Demo</h3><p>启动<a href="/doc/quick-start.html" class="">快速入门</a>里的<code>math-game</code>。</p><h3 id="观察函数调用返回时的参数、this-对象和返回值" tabindex="-1"><a class="header-anchor" href="#观察函数调用返回时的参数、this-对象和返回值" aria-hidden="true">#</a> 观察函数调用返回时的参数、this 对象和返回值</h3><div class="custom-container tip"><p class="custom-container-title">提示</p><p>观察表达式，默认值是<code>{params, target, returnObj}</code></p></div><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ <span class="token function">watch</span> demo.MathGame primeFactors <span class="token parameter variable">-x</span> <span class="token number">2</span>
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Press Q or Ctrl+C to abort.
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Affect<span class="token punctuation">(</span>class count: <span class="token number">1</span> , method count: <span class="token number">1</span><span class="token punctuation">)</span> cost <span class="token keyword">in</span> <span class="token number">32</span> ms, listenerId: <span class="token number">5</span>
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<span class="token assign-left variable">method</span><span class="token operator">=</span>demo.MathGame.primeFactors <span class="token assign-left variable">location</span><span class="token operator">=</span>AtExceptionExit
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<span class="token assign-left variable">ts</span><span class="token operator">=</span><span class="token number">2021</span>-08-31 <span class="token number">15</span>:22:57<span class="token punctuation">;</span> <span class="token punctuation">[</span>cost<span class="token operator">=</span><span class="token number">0</span>.220625ms<span class="token punctuation">]</span> <span class="token assign-left variable">result</span><span class="token operator">=</span>@ArrayList<span class="token punctuation">[</span>
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@Object<span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">[</span>
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@Integer<span class="token punctuation">[</span>-179173<span class="token punctuation">]</span>,
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<span class="token punctuation">]</span>,
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@MathGame<span class="token punctuation">[</span>
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<span class="token assign-left variable">random</span><span class="token operator">=</span>@Random<span class="token punctuation">[</span>java.util.Random@31cefde0<span class="token punctuation">]</span>,
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<span class="token assign-left variable">illegalArgumentCount</span><span class="token operator">=</span>@Integer<span class="token punctuation">[</span><span class="token number">44</span><span class="token punctuation">]</span>,
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<span class="token punctuation">]</span>,
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null,
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<span class="token punctuation">]</span>
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<span class="token assign-left variable">method</span><span class="token operator">=</span>demo.MathGame.primeFactors <span class="token assign-left variable">location</span><span class="token operator">=</span>AtExit
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<span class="token assign-left variable">ts</span><span class="token operator">=</span><span class="token number">2021</span>-08-31 <span class="token number">15</span>:22:58<span class="token punctuation">;</span> <span class="token punctuation">[</span>cost<span class="token operator">=</span><span class="token number">1</span>.020982ms<span class="token punctuation">]</span> <span class="token assign-left variable">result</span><span class="token operator">=</span>@ArrayList<span class="token punctuation">[</span>
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@Object<span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">[</span>
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@Integer<span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">]</span>,
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<span class="token punctuation">]</span>,
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@MathGame<span class="token punctuation">[</span>
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<span class="token assign-left variable">random</span><span class="token operator">=</span>@Random<span class="token punctuation">[</span>java.util.Random@31cefde0<span class="token punctuation">]</span>,
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<span class="token assign-left variable">illegalArgumentCount</span><span class="token operator">=</span>@Integer<span class="token punctuation">[</span><span class="token number">44</span><span class="token punctuation">]</span>,
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<span class="token punctuation">]</span>,
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@ArrayList<span class="token punctuation">[</span>
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@Integer<span class="token punctuation">[</span><span class="token number">2</span><span class="token punctuation">]</span>,
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@Integer<span class="token punctuation">[</span><span class="token number">2</span><span class="token punctuation">]</span>,
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@Integer<span class="token punctuation">[</span><span class="token number">26947</span><span class="token punctuation">]</span>,
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<span class="token punctuation">]</span>,
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><ul><li>上面的结果里，说明函数被执行了两次，第一次结果是<code>location=AtExceptionExit</code>，说明函数抛出异常了，因此<code>returnObj</code>是 null</li><li>在第二次结果里是<code>location=AtExit</code>，说明函数正常返回，因此可以看到<code>returnObj</code>结果是一个 ArrayList</li></ul><h3 id="观察函数调用入口的参数和返回值" tabindex="-1"><a class="header-anchor" href="#观察函数调用入口的参数和返回值" aria-hidden="true">#</a> 观察函数调用入口的参数和返回值</h3><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ <span class="token function">watch</span> demo.MathGame primeFactors <span class="token string">"{params,returnObj}"</span> <span class="token parameter variable">-x</span> <span class="token number">2</span> <span class="token parameter variable">-b</span>
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Press Ctrl+C to abort.
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Affect<span class="token punctuation">(</span>class-cnt:1 , method-cnt:1<span class="token punctuation">)</span> cost <span class="token keyword">in</span> <span class="token number">50</span> ms.
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<span class="token assign-left variable">ts</span><span class="token operator">=</span><span class="token number">2018</span>-12-03 <span class="token number">19</span>:23:23<span class="token punctuation">;</span> <span class="token punctuation">[</span>cost<span class="token operator">=</span><span class="token number">0</span>.0353ms<span class="token punctuation">]</span> <span class="token assign-left variable">result</span><span class="token operator">=</span>@ArrayList<span class="token punctuation">[</span>
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@Object<span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">[</span>
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@Integer<span class="token punctuation">[</span>-1077465243<span class="token punctuation">]</span>,
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<span class="token punctuation">]</span>,
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null,
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<span class="token punctuation">]</span>
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><ul><li>对比前一个例子，返回值为空（事件点为函数执行前，因此获取不到返回值）</li></ul><h3 id="同时观察函数调用前和函数返回后" tabindex="-1"><a class="header-anchor" href="#同时观察函数调用前和函数返回后" aria-hidden="true">#</a> 同时观察函数调用前和函数返回后</h3><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ <span class="token function">watch</span> demo.MathGame primeFactors <span class="token string">"{params,target,returnObj}"</span> <span class="token parameter variable">-x</span> <span class="token number">2</span> <span class="token parameter variable">-b</span> <span class="token parameter variable">-s</span> <span class="token parameter variable">-n</span> <span class="token number">2</span>
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Press Ctrl+C to abort.
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Affect<span class="token punctuation">(</span>class-cnt:1 , method-cnt:1<span class="token punctuation">)</span> cost <span class="token keyword">in</span> <span class="token number">46</span> ms.
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<span class="token assign-left variable">ts</span><span class="token operator">=</span><span class="token number">2018</span>-12-03 <span class="token number">19</span>:29:54<span class="token punctuation">;</span> <span class="token punctuation">[</span>cost<span class="token operator">=</span><span class="token number">0</span>.01696ms<span class="token punctuation">]</span> <span class="token assign-left variable">result</span><span class="token operator">=</span>@ArrayList<span class="token punctuation">[</span>
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@Object<span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">[</span>
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@Integer<span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">]</span>,
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<span class="token punctuation">]</span>,
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@MathGame<span class="token punctuation">[</span>
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<span class="token assign-left variable">random</span><span class="token operator">=</span>@Random<span class="token punctuation">[</span>java.util.Random@522b408a<span class="token punctuation">]</span>,
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<span class="token assign-left variable">illegalArgumentCount</span><span class="token operator">=</span>@Integer<span class="token punctuation">[</span><span class="token number">13038</span><span class="token punctuation">]</span>,
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<span class="token punctuation">]</span>,
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null,
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<span class="token punctuation">]</span>
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<span class="token assign-left variable">ts</span><span class="token operator">=</span><span class="token number">2018</span>-12-03 <span class="token number">19</span>:29:54<span class="token punctuation">;</span> <span class="token punctuation">[</span>cost<span class="token operator">=</span><span class="token number">4</span>.277392ms<span class="token punctuation">]</span> <span class="token assign-left variable">result</span><span class="token operator">=</span>@ArrayList<span class="token punctuation">[</span>
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@Object<span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">[</span>
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@Integer<span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">]</span>,
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<span class="token punctuation">]</span>,
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@MathGame<span class="token punctuation">[</span>
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<span class="token assign-left variable">random</span><span class="token operator">=</span>@Random<span class="token punctuation">[</span>java.util.Random@522b408a<span class="token punctuation">]</span>,
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<span class="token assign-left variable">illegalArgumentCount</span><span class="token operator">=</span>@Integer<span class="token punctuation">[</span><span class="token number">13038</span><span class="token punctuation">]</span>,
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<span class="token punctuation">]</span>,
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@ArrayList<span class="token punctuation">[</span>
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@Integer<span class="token punctuation">[</span><span class="token number">2</span><span class="token punctuation">]</span>,
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@Integer<span class="token punctuation">[</span><span class="token number">2</span><span class="token punctuation">]</span>,
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@Integer<span class="token punctuation">[</span><span class="token number">2</span><span class="token punctuation">]</span>,
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@Integer<span class="token punctuation">[</span><span class="token number">5</span><span class="token punctuation">]</span>,
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@Integer<span class="token punctuation">[</span><span class="token number">5</span><span class="token punctuation">]</span>,
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@Integer<span class="token punctuation">[</span><span class="token number">73</span><span class="token punctuation">]</span>,
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@Integer<span class="token punctuation">[</span><span class="token number">241</span><span class="token punctuation">]</span>,
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@Integer<span class="token punctuation">[</span><span class="token number">439</span><span class="token punctuation">]</span>,
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<span class="token punctuation">]</span>,
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<span class="token punctuation">]</span>
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><ul><li><p>参数里<code>-n 2</code>，表示只执行两次</p></li><li><p>这里输出结果中，第一次输出的是函数调用前的观察表达式的结果，第二次输出的是函数返回后的表达式的结果</p></li><li><p>结果的输出顺序和事件发生的先后顺序一致，和命令中 <code>-s -b</code> 的顺序无关</p></li></ul><h3 id="调整-x的值-观察具体的函数参数值" tabindex="-1"><a class="header-anchor" href="#调整-x的值-观察具体的函数参数值" aria-hidden="true">#</a> 调整<code>-x</code>的值，观察具体的函数参数值</h3><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ <span class="token function">watch</span> demo.MathGame primeFactors <span class="token string">"{params,target}"</span> <span class="token parameter variable">-x</span> <span class="token number">3</span>
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Press Ctrl+C to abort.
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Affect<span class="token punctuation">(</span>class-cnt:1 , method-cnt:1<span class="token punctuation">)</span> cost <span class="token keyword">in</span> <span class="token number">58</span> ms.
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<span class="token assign-left variable">ts</span><span class="token operator">=</span><span class="token number">2018</span>-12-03 <span class="token number">19</span>:34:19<span class="token punctuation">;</span> <span class="token punctuation">[</span>cost<span class="token operator">=</span><span class="token number">0</span>.587833ms<span class="token punctuation">]</span> <span class="token assign-left variable">result</span><span class="token operator">=</span>@ArrayList<span class="token punctuation">[</span>
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@Object<span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">[</span>
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@Integer<span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">]</span>,
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<span class="token punctuation">]</span>,
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@MathGame<span class="token punctuation">[</span>
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<span class="token assign-left variable">random</span><span class="token operator">=</span>@Random<span class="token punctuation">[</span>
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<span class="token assign-left variable">serialVersionUID</span><span class="token operator">=</span>@Long<span class="token punctuation">[</span><span class="token number">3905348978240129619</span><span class="token punctuation">]</span>,
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<span class="token assign-left variable">seed</span><span class="token operator">=</span>@AtomicLong<span class="token punctuation">[</span><span class="token number">3133719055989</span><span class="token punctuation">]</span>,
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<span class="token assign-left variable">multiplier</span><span class="token operator">=</span>@Long<span class="token punctuation">[</span><span class="token number">25214903917</span><span class="token punctuation">]</span>,
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<span class="token assign-left variable">addend</span><span class="token operator">=</span>@Long<span class="token punctuation">[</span><span class="token number">11</span><span class="token punctuation">]</span>,
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<span class="token assign-left variable">mask</span><span class="token operator">=</span>@Long<span class="token punctuation">[</span><span class="token number">281474976710655</span><span class="token punctuation">]</span>,
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<span class="token assign-left variable">DOUBLE_UNIT</span><span class="token operator">=</span>@Double<span class="token punctuation">[</span><span class="token number">1</span>.1102230246251565E-16<span class="token punctuation">]</span>,
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<span class="token assign-left variable">BadBound</span><span class="token operator">=</span>@String<span class="token punctuation">[</span>bound must be positive<span class="token punctuation">]</span>,
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<span class="token assign-left variable">BadRange</span><span class="token operator">=</span>@String<span class="token punctuation">[</span>bound must be greater than origin<span class="token punctuation">]</span>,
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<span class="token assign-left variable">BadSize</span><span class="token operator">=</span>@String<span class="token punctuation">[</span>size must be non-negative<span class="token punctuation">]</span>,
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<span class="token assign-left variable">seedUniquifier</span><span class="token operator">=</span>@AtomicLong<span class="token punctuation">[</span>-3282039941672302964<span class="token punctuation">]</span>,
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<span class="token assign-left variable">nextNextGaussian</span><span class="token operator">=</span>@Double<span class="token punctuation">[</span><span class="token number">0.0</span><span class="token punctuation">]</span>,
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<span class="token assign-left variable">haveNextNextGaussian</span><span class="token operator">=</span>@Boolean<span class="token punctuation">[</span>false<span class="token punctuation">]</span>,
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<span class="token assign-left variable">serialPersistentFields</span><span class="token operator">=</span>@ObjectStreamField<span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">[</span>isEmpty<span class="token operator">=</span>false<span class="token punctuation">;</span><span class="token assign-left variable">size</span><span class="token operator">=</span><span class="token number">3</span><span class="token punctuation">]</span>,
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<span class="token assign-left variable">unsafe</span><span class="token operator">=</span>@Unsafe<span class="token punctuation">[</span>sun.misc.Unsafe@2eaa1027<span class="token punctuation">]</span>,
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<span class="token assign-left variable">seedOffset</span><span class="token operator">=</span>@Long<span class="token punctuation">[</span><span class="token number">24</span><span class="token punctuation">]</span>,
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<span class="token punctuation">]</span>,
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<span class="token assign-left variable">illegalArgumentCount</span><span class="token operator">=</span>@Integer<span class="token punctuation">[</span><span class="token number">13159</span><span class="token punctuation">]</span>,
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<span class="token punctuation">]</span>,
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<span class="token punctuation">]</span>
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><ul><li><code>-x</code>表示遍历深度，可以调整来打印具体的参数和结果内容，默认值是 1。</li><li><code>-x</code>最大值是 4，防止展开结果占用太多内存。用户可以在<code>ognl</code>表达式里指定更具体的 field。</li></ul><h3 id="条件表达式的例子" tabindex="-1"><a class="header-anchor" href="#条件表达式的例子" aria-hidden="true">#</a> 条件表达式的例子</h3><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ <span class="token function">watch</span> demo.MathGame primeFactors <span class="token string">"{params[0],target}"</span> <span class="token string">"params[0]<0"</span>
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Press Ctrl+C to abort.
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Affect<span class="token punctuation">(</span>class-cnt:1 , method-cnt:1<span class="token punctuation">)</span> cost <span class="token keyword">in</span> <span class="token number">68</span> ms.
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<span class="token assign-left variable">ts</span><span class="token operator">=</span><span class="token number">2018</span>-12-03 <span class="token number">19</span>:36:04<span class="token punctuation">;</span> <span class="token punctuation">[</span>cost<span class="token operator">=</span><span class="token number">0</span>.530255ms<span class="token punctuation">]</span> <span class="token assign-left variable">result</span><span class="token operator">=</span>@ArrayList<span class="token punctuation">[</span>
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@Integer<span class="token punctuation">[</span>-18178089<span class="token punctuation">]</span>,
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@MathGame<span class="token punctuation">[</span>demo.MathGame@41cf53f9<span class="token punctuation">]</span>,
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<span class="token punctuation">]</span>
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><ul><li>只有满足条件的调用，才会有响应。</li></ul><h3 id="观察异常信息的例子" tabindex="-1"><a class="header-anchor" href="#观察异常信息的例子" aria-hidden="true">#</a> 观察异常信息的例子</h3><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ <span class="token function">watch</span> demo.MathGame primeFactors <span class="token string">"{params[0],throwExp}"</span> <span class="token parameter variable">-e</span> <span class="token parameter variable">-x</span> <span class="token number">2</span>
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Press Ctrl+C to abort.
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Affect<span class="token punctuation">(</span>class-cnt:1 , method-cnt:1<span class="token punctuation">)</span> cost <span class="token keyword">in</span> <span class="token number">62</span> ms.
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<span class="token assign-left variable">ts</span><span class="token operator">=</span><span class="token number">2018</span>-12-03 <span class="token number">19</span>:38:00<span class="token punctuation">;</span> <span class="token punctuation">[</span>cost<span class="token operator">=</span><span class="token number">1</span>.414993ms<span class="token punctuation">]</span> <span class="token assign-left variable">result</span><span class="token operator">=</span>@ArrayList<span class="token punctuation">[</span>
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@Integer<span class="token punctuation">[</span>-1120397038<span class="token punctuation">]</span>,
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java.lang.IllegalArgumentException: number is: -1120397038, need <span class="token operator">>=</span> <span class="token number">2</span>
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at demo.MathGame.primeFactors<span class="token punctuation">(</span>MathGame.java:46<span class="token punctuation">)</span>
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at demo.MathGame.run<span class="token punctuation">(</span>MathGame.java:24<span class="token punctuation">)</span>
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at demo.MathGame.main<span class="token punctuation">(</span>MathGame.java:16<span class="token punctuation">)</span>
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,
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<span class="token punctuation">]</span>
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><ul><li><code>-e</code>表示抛出异常时才触发</li><li>express 中，表示异常信息的变量是<code>throwExp</code></li></ul><h3 id="按照耗时进行过滤" tabindex="-1"><a class="header-anchor" href="#按照耗时进行过滤" aria-hidden="true">#</a> 按照耗时进行过滤</h3><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ <span class="token function">watch</span> demo.MathGame primeFactors <span class="token string">'{params, returnObj}'</span> <span class="token string">'#cost>200'</span> <span class="token parameter variable">-x</span> <span class="token number">2</span>
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Press Ctrl+C to abort.
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Affect<span class="token punctuation">(</span>class-cnt:1 , method-cnt:1<span class="token punctuation">)</span> cost <span class="token keyword">in</span> <span class="token number">66</span> ms.
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<span class="token assign-left variable">ts</span><span class="token operator">=</span><span class="token number">2018</span>-12-03 <span class="token number">19</span>:40:28<span class="token punctuation">;</span> <span class="token punctuation">[</span>cost<span class="token operator">=</span><span class="token number">2112</span>.168897ms<span class="token punctuation">]</span> <span class="token assign-left variable">result</span><span class="token operator">=</span>@ArrayList<span class="token punctuation">[</span>
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@Object<span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">[</span>
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@Integer<span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">]</span>,
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<span class="token punctuation">]</span>,
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@ArrayList<span class="token punctuation">[</span>
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@Integer<span class="token punctuation">[</span><span class="token number">5</span><span class="token punctuation">]</span>,
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@Integer<span class="token punctuation">[</span><span class="token number">428379493</span><span class="token punctuation">]</span>,
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<span class="token punctuation">]</span>,
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<span class="token punctuation">]</span>
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><ul><li><code>#cost>200</code>(单位是<code>ms</code>)表示只有当耗时大于 200ms 时才会输出，过滤掉执行时间小于 200ms 的调用</li></ul><h3 id="观察当前对象中的属性" tabindex="-1"><a class="header-anchor" href="#观察当前对象中的属性" aria-hidden="true">#</a> 观察当前对象中的属性</h3><p>如果想查看函数运行前后，当前对象中的属性，可以使用<code>target</code>关键字，代表当前对象</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ <span class="token function">watch</span> demo.MathGame primeFactors <span class="token string">'target'</span>
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Press Ctrl+C to abort.
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Affect<span class="token punctuation">(</span>class-cnt:1 , method-cnt:1<span class="token punctuation">)</span> cost <span class="token keyword">in</span> <span class="token number">52</span> ms.
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<span class="token assign-left variable">ts</span><span class="token operator">=</span><span class="token number">2018</span>-12-03 <span class="token number">19</span>:41:52<span class="token punctuation">;</span> <span class="token punctuation">[</span>cost<span class="token operator">=</span><span class="token number">0</span>.477882ms<span class="token punctuation">]</span> <span class="token assign-left variable">result</span><span class="token operator">=</span>@MathGame<span class="token punctuation">[</span>
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<span class="token assign-left variable">random</span><span class="token operator">=</span>@Random<span class="token punctuation">[</span>java.util.Random@522b408a<span class="token punctuation">]</span>,
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<span class="token assign-left variable">illegalArgumentCount</span><span class="token operator">=</span>@Integer<span class="token punctuation">[</span><span class="token number">13355</span><span class="token punctuation">]</span>,
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<span class="token punctuation">]</span>
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p>然后使用<code>target.field_name</code>访问当前对象的某个属性</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ <span class="token function">watch</span> demo.MathGame primeFactors <span class="token string">'target.illegalArgumentCount'</span>
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Press Ctrl+C to abort.
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Affect<span class="token punctuation">(</span>class-cnt:1 , method-cnt:1<span class="token punctuation">)</span> cost <span class="token keyword">in</span> <span class="token number">67</span> ms.
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<span class="token assign-left variable">ts</span><span class="token operator">=</span><span class="token number">2018</span>-12-03 <span class="token number">20</span>:04:34<span class="token punctuation">;</span> <span class="token punctuation">[</span>cost<span class="token operator">=</span><span class="token number">131</span>.303498ms<span class="token punctuation">]</span> <span class="token assign-left variable">result</span><span class="token operator">=</span>@Integer<span class="token punctuation">[</span><span class="token number">8</span><span class="token punctuation">]</span>
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<span class="token assign-left variable">ts</span><span class="token operator">=</span><span class="token number">2018</span>-12-03 <span class="token number">20</span>:04:35<span class="token punctuation">;</span> <span class="token punctuation">[</span>cost<span class="token operator">=</span><span class="token number">0</span>.961441ms<span class="token punctuation">]</span> <span class="token assign-left variable">result</span><span class="token operator">=</span>@Integer<span class="token punctuation">[</span><span class="token number">8</span><span class="token punctuation">]</span>
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="获取类的静态字段、调用类的静态函数的例子" tabindex="-1"><a class="header-anchor" href="#获取类的静态字段、调用类的静态函数的例子" aria-hidden="true">#</a> 获取类的静态字段、调用类的静态函数的例子</h3><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code><span class="token function">watch</span> demo.MathGame * <span class="token string">'{params,@demo.MathGame@random.nextInt(100)}'</span> <span class="token parameter variable">-v</span> <span class="token parameter variable">-n</span> <span class="token number">1</span> <span class="token parameter variable">-x</span> <span class="token number">2</span>
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<span class="token punctuation">[</span>arthas@6527<span class="token punctuation">]</span>$ <span class="token function">watch</span> demo.MathGame * <span class="token string">'{params,@demo.MathGame@random.nextInt(100)}'</span> <span class="token parameter variable">-n</span> <span class="token number">1</span> <span class="token parameter variable">-x</span> <span class="token number">2</span>
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Press Q or Ctrl+C to abort.
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Affect<span class="token punctuation">(</span>class count: <span class="token number">1</span> , method count: <span class="token number">5</span><span class="token punctuation">)</span> cost <span class="token keyword">in</span> <span class="token number">34</span> ms, listenerId: <span class="token number">3</span>
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<span class="token assign-left variable">ts</span><span class="token operator">=</span><span class="token number">2021</span>-01-05 <span class="token number">21</span>:35:20<span class="token punctuation">;</span> <span class="token punctuation">[</span>cost<span class="token operator">=</span><span class="token number">0</span>.173966ms<span class="token punctuation">]</span> <span class="token assign-left variable">result</span><span class="token operator">=</span>@ArrayList<span class="token punctuation">[</span>
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@Object<span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">[</span>
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@Integer<span class="token punctuation">[</span>-138282<span class="token punctuation">]</span>,
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<span class="token punctuation">]</span>,
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@Integer<span class="token punctuation">[</span><span class="token number">89</span><span class="token punctuation">]</span>,
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<span class="token punctuation">]</span>
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><ul><li>注意这里使用 <code>Thread.currentThread().getContextClassLoader()</code> 加载,使用精确<code>classloader</code> <a href="/doc/ognl.html" class="">ognl</a>更好。</li></ul><h3 id="排除掉指定的类" tabindex="-1"><a class="header-anchor" href="#排除掉指定的类" aria-hidden="true">#</a> 排除掉指定的类</h3><div class="custom-container tip"><p class="custom-container-title">提示</p><p>watch/trace/monitor/stack/tt 命令都支持 <code>--exclude-class-pattern</code> 参数</p></div><p>使用 <code>--exclude-class-pattern</code> 参数可以排除掉指定的类，比如：</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code><span class="token function">watch</span> javax.servlet.Filter * --exclude-class-pattern com.demo.TestFilter
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h3 id="不匹配子类" tabindex="-1"><a class="header-anchor" href="#不匹配子类" aria-hidden="true">#</a> 不匹配子类</h3><p>默认情况下 watch/trace/monitor/stack/tt 命令都会匹配子类。如果想不匹配，可以通过全局参数关掉。</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>options disable-sub-class <span class="token boolean">true</span>
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h3 id="使用-v-参数打印更多信息" tabindex="-1"><a class="header-anchor" href="#使用-v-参数打印更多信息" aria-hidden="true">#</a> 使用 -v 参数打印更多信息</h3><div class="custom-container tip"><p class="custom-container-title">提示</p><p>watch/trace/monitor/stack/tt 命令都支持 <code>-v</code> 参数</p></div><p>当命令执行之后，没有输出结果。有两种可能：</p><ol><li>匹配到的函数没有被执行</li><li>条件表达式结果是 false</li></ol><p>但用户区分不出是哪种情况。</p><p>使用 <code>-v</code>选项，则会打印<code>Condition express</code>的具体值和执行结果，方便确认。</p><p>比如：</p><div class="language-text ext-text line-numbers-mode"><pre class="language-text"><code>$ watch -v -x 2 demo.MathGame print 'params' 'params[0] > 100000'
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Press Q or Ctrl+C to abort.
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Affect(class count: 1 , method count: 1) cost in 29 ms, listenerId: 11
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Condition express: params[0] > 100000 , result: false
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Condition express: params[0] > 100000 , result: false
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Condition express: params[0] > 100000 , result: true
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ts=2020-12-02 22:38:56; [cost=0.060843ms] result=@Object[][
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@Integer[200033],
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@ArrayList[
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@Integer[200033],
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],
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]
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Condition express: params[0] > 100000 , result: true
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ts=2020-12-02 22:38:57; [cost=0.052877ms] result=@Object[][
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@Integer[123047],
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@ArrayList[
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@Integer[29],
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@Integer[4243],
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],
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]
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div></div><!--[--><!--]--></div><footer class="page-meta right-menu-padding" data-v-fdd717e0><div class="meta-item edit-link"><a class="external-link meta-item-label" href="https://github.com/alibaba/arthas/edit/master/site/docs/doc/watch.md" rel="noopener noreferrer" target="_blank" aria-label="在 GitHub 上编辑此页"><!--[--><!--]--><span>在 GitHub 上编辑此页</span><span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewbox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">在新窗口打开</span></span><!--[--><!--]--></a></div><div class="meta-item last-updated"><span class="meta-item-label">Last Updated: </span><!----></div><div class="meta-item contributors"><span class="meta-item-label">贡献者: </span><span class="meta-item-info"><!--[--><!--[--><span class="contributor" title="email: hengyunabc@gmail.com">hengyunabc</span><!--[-->, <!--]--><!--]--><!--[--><span class="contributor" title="email: i@fatpandac.com">Fatpandac</span><!--[-->, <!--]--><!--]--><!--[--><span class="contributor" title="email: hollowman186@vip.qq.com">Hollow Man</span><!--[-->, <!--]--><!--]--><!--[--><span class="contributor" title="email: snipercy@users.noreply.github.com">vic</span><!--[-->, <!--]--><!--]--><!--[--><span class="contributor" title="email: 983433479@qq.com">汪吉</span><!----><!--]--><!--]--></span></div></footer><nav class="page-nav right-menu-padding" data-v-fdd717e0><p class="inner"><span class="prev"><a href="/doc/tt.html" class="" aria-label="tt"><!--[--><!--]--> tt <!--[--><!--]--></a></span><span class="next"><a href="/doc/profiler.html" class="" aria-label="profiler"><!--[--><!--]--> profiler <!--[--><!--]--></a></span></p></nav><!--[--><!--]--></main><!--]--></div><!----><!--]--></div>
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