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<div class="section" id="fundamental-fields-in-expressions">
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<span id="fundamental-fields-in-expressions"></span><h1>Fundamental Fields in Expressions<a class="headerlink" href="#fundamental-fields-in-expressions" title="Permalink to this headline">¶</a></h1>
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<p>There is a very fundamental class <code class="docutils literal notranslate"><span class="pre">Advice</span></code> for the expressions used in filtering, tracing or monitoring and other aspects in commands.</p>
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<div class="highlight-java notranslate"><div class="highlight"><pre><span></span><span class="kd">public</span> <span class="kd">class</span> <span class="nc">Advice</span> <span class="o">{</span>
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<span class="kd">private</span> <span class="kd">final</span> <span class="n">ClassLoader</span> <span class="n">loader</span><span class="o">;</span>
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<span class="kd">private</span> <span class="kd">final</span> <span class="n">Class</span><span class="o"><?></span> <span class="n">clazz</span><span class="o">;</span>
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<span class="kd">private</span> <span class="kd">final</span> <span class="n">ArthasMethod</span> <span class="n">method</span><span class="o">;</span>
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<span class="kd">private</span> <span class="kd">final</span> <span class="n">Object</span> <span class="n">target</span><span class="o">;</span>
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<span class="kd">private</span> <span class="kd">final</span> <span class="n">Object</span><span class="o">[]</span> <span class="n">params</span><span class="o">;</span>
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<span class="kd">private</span> <span class="kd">final</span> <span class="n">Object</span> <span class="n">returnObj</span><span class="o">;</span>
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<span class="kd">private</span> <span class="kd">final</span> <span class="n">Throwable</span> <span class="n">throwExp</span><span class="o">;</span>
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<span class="kd">private</span> <span class="kd">final</span> <span class="kt">boolean</span> <span class="n">isBefore</span><span class="o">;</span>
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<span class="kd">private</span> <span class="kd">final</span> <span class="kt">boolean</span> <span class="n">isThrow</span><span class="o">;</span>
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<span class="kd">private</span> <span class="kd">final</span> <span class="kt">boolean</span> <span class="n">isReturn</span><span class="o">;</span>
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<span class="c1">// getter/setter </span>
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<span class="o">}</span>
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</pre></div>
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</div>
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<p>Description for the variables in the class <code class="docutils literal notranslate"><span class="pre">Advice</span></code>:</p>
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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">Name</th>
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<th align="left">Specification</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">loader</td>
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<td align="left">the class loader for the current called class</td>
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</tr>
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<tr>
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<td align="right">clazz</td>
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<td align="left">the reference to the current called class</td>
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</tr>
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<tr>
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<td align="right">method</td>
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<td align="left">the reference to the current called method</td>
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</tr>
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<tr>
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<td align="right">target</td>
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<td align="left">the instance of the current called class</td>
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</tr>
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<tr>
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<td align="right">params</td>
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<td align="left">the parameters for the current call, which is an array (when there's no parameter, it will be an empty array)</td>
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</tr>
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<tr>
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<td align="right">returnObj</td>
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<td align="left">the return value from the current call - only available when the method call returns normally (<code>isReturn==true</code>), and <code>null</code> is for <code>void</code> return value</td>
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</tr>
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<tr>
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<td align="right">throwExp</td>
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<td align="left">the exceptions thrown from the current call - only available when the method call throws exception (<code>isThrow==true</code>)</td>
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</tr>
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<tr>
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<td align="right">isBefore</td>
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<td align="left">flag to indicate the method is about to execute. <code>isBefore==true</code> but <code>isThrow==false</code> and <code>isReturn==false</code> since it's no way to know how the method call will end</td>
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</tr>
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<tr>
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<td align="right">isThrow</td>
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<td align="left">flag to indicate the method call ends with exception thrown</td>
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</tr>
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<tr>
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<td align="right">isReturn</td>
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<td align="left">flag to indicate the method call ends normally without exception thrown</td>
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</tr>
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</tbody>
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</table><p>All variables listed above can be used directly in the <a class="reference external" href="https://commons.apache.org/proper/commons-ognl/language-guide.html">OGNL expression</a>. The command will not execute and exit if there’s illegal OGNL grammar or unexpected variable in the expression.</p>
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<ul class="simple">
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<li><a class="reference external" href="https://github.com/alibaba/arthas/issues/71">typical use cases</a>;</li>
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<li><a class="reference external" href="https://commons.apache.org/proper/commons-ognl/language-guide.html">OGNL language guide</a>.</li>
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</ul>
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