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<div class="section" id="stack">
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<h1>stack<a class="headerlink" href="#stack" title="永久链接至标题">¶</a></h1>
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<blockquote>
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<div><p>输出当前方法被调用的调用路径</p>
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</div></blockquote>
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<p>很多时候我们都知道一个方法被执行，但这个方法被执行的路径非常多，或者你根本就不知道这个方法是从那里被执行了，此时你需要的是 stack 命令。</p>
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<div class="section" id="id1">
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<h2>参数说明<a class="headerlink" href="#id1" 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>condition-express</em></td>
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<td align="left">条件表达式</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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<tr>
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<td align="right"><code>[n:]</code></td>
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<td align="left">执行次数限制</td>
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</tr>
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</tbody>
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</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 class="docutils literal notranslate"><span class="pre">"{params,returnObj}"</span></code>，只要是一个合法的 ognl 表达式，都能被正常支持。</p>
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<p>观察的维度也比较多，主要体现在参数 <code class="docutils literal notranslate"><span class="pre">advice</span></code> 的数据结构上。<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。</p>
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<p>请参考<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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<ul class="simple">
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<li><p>特殊用法请参考：<a class="reference external" href="https://github.com/alibaba/arthas/issues/71">https://github.com/alibaba/arthas/issues/71</a></p></li>
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<li><p>OGNL表达式官网：<a class="reference external" href="https://commons.apache.org/proper/commons-ognl/language-guide.html">https://commons.apache.org/proper/commons-ognl/language-guide.html</a></p></li>
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</ul>
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</div>
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<div class="section" id="id2">
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<h2>使用例子<a class="headerlink" href="#id2" title="永久链接至标题">¶</a></h2>
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<div class="section" id="demo">
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<h3>启动 Demo<a class="headerlink" href="#demo" title="永久链接至标题">¶</a></h3>
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<p>启动<a class="reference internal" href="quick-start.html"><span class="doc">快速入门</span></a>里的<code class="docutils literal notranslate"><span class="pre">arthas-demo</span></code>。</p>
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</div>
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<div class="section" id="id3">
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<h3>stack<a class="headerlink" href="#id3" title="永久链接至标题">¶</a></h3>
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ stack demo.MathGame primeFactors
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Press Ctrl+C to abort.
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Affect(class-cnt:1 , method-cnt:1) cost in 36 ms.
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ts=2018-12-04 01:32:19;thread_name=main;id=1;is_daemon=false;priority=5;TCCL=sun.misc.Launcher$AppClassLoader@3d4eac69
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@demo.MathGame.run()
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at demo.MathGame.main(MathGame.java:16)</pre></div>
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</div>
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</div>
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<div class="section" id="id4">
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<h3>据条件表达式来过滤<a class="headerlink" href="#id4" title="永久链接至标题">¶</a></h3>
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ stack demo.MathGame primeFactors 'params[0]<0' -n 2
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Press Ctrl+C to abort.
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Affect(class-cnt:1 , method-cnt:1) cost in 30 ms.
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ts=2018-12-04 01:34:27;thread_name=main;id=1;is_daemon=false;priority=5;TCCL=sun.misc.Launcher$AppClassLoader@3d4eac69
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@demo.MathGame.run()
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at demo.MathGame.main(MathGame.java:16)
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ts=2018-12-04 01:34:30;thread_name=main;id=1;is_daemon=false;priority=5;TCCL=sun.misc.Launcher$AppClassLoader@3d4eac69
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@demo.MathGame.run()
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at demo.MathGame.main(MathGame.java:16)
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Command execution times exceed limit: 2, so command will exit. You can set it with -n option.</pre></div>
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</div>
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</div>
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<div class="section" id="id5">
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<h3>据执行时间来过滤<a class="headerlink" href="#id5" title="永久链接至标题">¶</a></h3>
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ stack demo.MathGame primeFactors '#cost>5'
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Press Ctrl+C to abort.
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Affect(class-cnt:1 , method-cnt:1) cost in 35 ms.
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ts=2018-12-04 01:35:58;thread_name=main;id=1;is_daemon=false;priority=5;TCCL=sun.misc.Launcher$AppClassLoader@3d4eac69
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@demo.MathGame.run()
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at demo.MathGame.main(MathGame.java:16)</pre></div>
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