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3.0.6-SNAPSHOT
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<div class="section" id="groovy">
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<span id="groovy"></span><h1>groovy<a class="headerlink" href="#groovy" title="Permalink to this headline">¶</a></h1>
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<blockquote>
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<div>Arthas support groovy scripting to allow user to use script like BTrace. It is possible to use if/for/switch/while in groovy scripting, but has more limitations compared to BTrace.</div></blockquote>
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<div class="section" id="limitations">
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<span id="limitations"></span><h2>Limitations<a class="headerlink" href="#limitations" title="Permalink to this headline">¶</a></h2>
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<ol class="simple">
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<li>Prohibit from alternating the original logic. Like <code class="docutils literal notranslate"><span class="pre">watch</span></code> command, The major purpose of scripting is monitoring and observing.</li>
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<li>Only allow to monitor at the stages of before/success/exception/finish on one method.</li>
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</ol>
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</div>
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<div class="section" id="parameters">
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<span id="parameters"></span><h2>Parameters<a class="headerlink" href="#parameters" title="Permalink to this headline">¶</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">Parameter</th>
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<th align="left">Explanation</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">class name pattern</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">method name pattern</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">the absolute path of the groovy script</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">match all sub classes</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">enable regex match, the default is wildcard match</td>
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</tr>
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</tbody>
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</table><p>Note: the third parameter <code class="docutils literal notranslate"><span class="pre">script-filepath</span></code> must be the absolute path of the groovy script, for example <code class="docutils literal notranslate"><span class="pre">/tmp/test.groovy</span></code>. It is not recommended to use relative path, e.g. <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="explanation-on-the-important-callbacks">
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<span id="explanation-on-the-important-callbacks"></span><h2>Explanation on the important callbacks<a class="headerlink" href="#explanation-on-the-important-callbacks" title="Permalink to this headline">¶</a></h2>
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<div class="highlight-java notranslate"><div class="highlight"><pre><span></span><span class="cm">/**</span>
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<span class="cm"> * Listeners for script to enhance the class</span>
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<span class="cm"> */</span>
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<span class="kd">interface</span> <span class="nc">ScriptListener</span> <span class="o">{</span>
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<span class="cm">/**</span>
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<span class="cm"> * When the script is created</span>
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<span class="cm"> *</span>
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<span class="cm"> * @param output Output</span>
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<span class="cm"> */</span>
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<span class="kt">void</span> <span class="nf">create</span><span class="o">(</span><span class="n">Output</span> <span class="n">output</span><span class="o">);</span>
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<span class="cm">/**</span>
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<span class="cm"> * When the script is destroyed</span>
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<span class="cm"> *</span>
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<span class="cm"> * @param output Output</span>
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<span class="cm"> */</span>
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<span class="kt">void</span> <span class="nf">destroy</span><span class="o">(</span><span class="n">Output</span> <span class="n">output</span><span class="o">);</span>
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<span class="cm">/**</span>
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<span class="cm"> * Before the method executes</span>
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<span class="cm"> *</span>
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<span class="cm"> * @param output Output</span>
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<span class="cm"> * @param advice Advice</span>
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<span class="cm"> */</span>
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<span class="kt">void</span> <span class="nf">before</span><span class="o">(</span><span class="n">Output</span> <span class="n">output</span><span class="o">,</span> <span class="n">Advice</span> <span class="n">advice</span><span class="o">);</span>
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<span class="cm">/**</span>
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<span class="cm"> * After the method returns</span>
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<span class="cm"> *</span>
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<span class="cm"> * @param output Output</span>
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<span class="cm"> * @param advice Advice</span>
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<span class="cm"> */</span>
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<span class="kt">void</span> <span class="nf">afterReturning</span><span class="o">(</span><span class="n">Output</span> <span class="n">output</span><span class="o">,</span> <span class="n">Advice</span> <span class="n">advice</span><span class="o">);</span>
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<span class="cm">/**</span>
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<span class="cm"> * After the method throws exceptions</span>
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<span class="cm"> *</span>
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<span class="cm"> * @param output Output</span>
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<span class="cm"> * @param advice Advice</span>
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<span class="cm"> */</span>
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<span class="kt">void</span> <span class="nf">afterThrowing</span><span class="o">(</span><span class="n">Output</span> <span class="n">output</span><span class="o">,</span> <span class="n">Advice</span> <span class="n">advice</span><span class="o">);</span>
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<span class="o">}</span>
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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-parameter">
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<span id="advice-parameter"></span><h2><code class="docutils literal notranslate"><span class="pre">Advice</span></code> parameter<a class="headerlink" href="#advice-parameter" title="Permalink to this headline">¶</a></h2>
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<p><code class="docutils literal notranslate"><span class="pre">Advice</span></code> contains all information necessary for notification. Refer to <a class="reference internal" href="advice-class.html"><span class="doc">expression core parameters</span></a> for more details.</p>
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</div>
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<div class="section" id="output-parameter">
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<span id="output-parameter"></span><h2><code class="docutils literal notranslate"><span class="pre">Output</span></code> parameter<a class="headerlink" href="#output-parameter" title="Permalink to this headline">¶</a></h2>
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<p>There are three methods in <code class="docutils literal notranslate"><span class="pre">Output</span></code>, used for outputting the corresponding text.</p>
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<div class="highlight-java notranslate"><div class="highlight"><pre><span></span><span class="cm">/**</span>
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<span class="cm"> * Output</span>
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<span class="cm"> */</span>
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<span class="kd">interface</span> <span class="nc">Output</span> <span class="o">{</span>
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<span class="cm">/**</span>
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<span class="cm"> * Output text without line break</span>
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<span class="cm"> *</span>
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<span class="cm"> * @param string Text to output</span>
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<span class="cm"> * @return this</span>
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<span class="cm"> */</span>
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<span class="n">Output</span> <span class="nf">print</span><span class="o">(</span><span class="n">String</span> <span class="n">string</span><span class="o">);</span>
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<span class="cm">/**</span>
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<span class="cm"> * Output text with line break</span>
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<span class="cm"> *</span>
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<span class="cm"> * @param string Text to output</span>
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<span class="cm"> * @return this</span>
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<span class="cm"> */</span>
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<span class="n">Output</span> <span class="nf">println</span><span class="o">(</span><span class="n">String</span> <span class="n">string</span><span class="o">);</span>
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<span class="cm">/**</span>
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<span class="cm"> * Finish outputting from the script</span>
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<span class="cm"> *</span>
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<span class="cm"> * @return this</span>
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<span class="cm"> */</span>
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<span class="n">Output</span> <span class="nf">finish</span><span class="o">();</span>
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<span class="o">}</span>
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</pre></div>
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</div>
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</div>
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<div class="section" id="a-groovy-sample-script-to-output-logs">
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<span id="a-groovy-sample-script-to-output-logs"></span><h2>A groovy sample script to output logs<a class="headerlink" href="#a-groovy-sample-script-to-output-logs" title="Permalink to this headline">¶</a></h2>
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<div class="highlight-groovy notranslate"><div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">com.taobao.arthas.core.command.ScriptSupportCommand</span>
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<span class="kn">import</span> <span class="nn">com.taobao.arthas.core.util.Advice</span>
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<span class="kn">import</span> <span class="nn">static</span> <span class="n">java</span><span class="o">.</span><span class="na">lang</span><span class="o">.</span><span class="na">String</span><span class="o">.</span><span class="na">format</span>
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<span class="cm">/**</span>
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<span class="cm"> * Output method logs</span>
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<span class="cm"> */</span>
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<span class="kd">public</span> <span class="kd">class</span> <span class="nc">Logger</span> <span class="kd">implements</span> <span class="n">ScriptSupportCommand</span><span class="o">.</span><span class="na">ScriptListener</span> <span class="o">{</span>
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<span class="nd">@Override</span>
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<span class="kt">void</span> <span class="nf">create</span><span class="o">(</span><span class="n">ScriptSupportCommand</span><span class="o">.</span><span class="na">Output</span> <span class="n">output</span><span class="o">)</span> <span class="o">{</span>
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<span class="n">output</span><span class="o">.</span><span class="na">println</span><span class="o">(</span><span class="s2">"script create."</span><span class="o">);</span>
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<span class="o">}</span>
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<span class="nd">@Override</span>
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<span class="kt">void</span> <span class="nf">destroy</span><span class="o">(</span><span class="n">ScriptSupportCommand</span><span class="o">.</span><span class="na">Output</span> <span class="n">output</span><span class="o">)</span> <span class="o">{</span>
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<span class="n">output</span><span class="o">.</span><span class="na">println</span><span class="o">(</span><span class="s2">"script destroy."</span><span class="o">);</span>
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<span class="o">}</span>
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<span class="nd">@Override</span>
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<span class="kt">void</span> <span class="nf">before</span><span class="o">(</span><span class="n">ScriptSupportCommand</span><span class="o">.</span><span class="na">Output</span> <span class="n">output</span><span class="o">,</span> <span class="n">Advice</span> <span class="n">advice</span><span class="o">)</span> <span class="o">{</span>
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<span class="n">output</span><span class="o">.</span><span class="na">println</span><span class="o">(</span><span class="n">format</span><span class="o">(</span><span class="s2">"before:class=%s;method=%s;paramslen=%d;%s;"</span><span class="o">,</span>
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<span class="n">advice</span><span class="o">.</span><span class="na">getClazz</span><span class="o">().</span><span class="na">getSimpleName</span><span class="o">(),</span>
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<span class="n">advice</span><span class="o">.</span><span class="na">getMethod</span><span class="o">().</span><span class="na">getName</span><span class="o">(),</span>
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<span class="n">advice</span><span class="o">.</span><span class="na">getParams</span><span class="o">().</span><span class="na">length</span><span class="o">,</span> <span class="n">advice</span><span class="o">.</span><span class="na">getParams</span><span class="o">()))</span>
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<span class="o">}</span>
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<span class="nd">@Override</span>
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<span class="kt">void</span> <span class="nf">afterReturning</span><span class="o">(</span><span class="n">ScriptSupportCommand</span><span class="o">.</span><span class="na">Output</span> <span class="n">output</span><span class="o">,</span> <span class="n">Advice</span> <span class="n">advice</span><span class="o">)</span> <span class="o">{</span>
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<span class="n">output</span><span class="o">.</span><span class="na">println</span><span class="o">(</span><span class="n">format</span><span class="o">(</span><span class="s2">"returning:class=%s;method=%s;"</span><span class="o">,</span>
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<span class="n">advice</span><span class="o">.</span><span class="na">getClazz</span><span class="o">().</span><span class="na">getSimpleName</span><span class="o">(),</span>
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<span class="n">advice</span><span class="o">.</span><span class="na">getMethod</span><span class="o">().</span><span class="na">getName</span><span class="o">()))</span>
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<span class="o">}</span>
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<span class="nd">@Override</span>
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<span class="kt">void</span> <span class="nf">afterThrowing</span><span class="o">(</span><span class="n">ScriptSupportCommand</span><span class="o">.</span><span class="na">Output</span> <span class="n">output</span><span class="o">,</span> <span class="n">Advice</span> <span class="n">advice</span><span class="o">)</span> <span class="o">{</span>
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<span class="n">output</span><span class="o">.</span><span class="na">println</span><span class="o">(</span><span class="n">format</span><span class="o">(</span><span class="s2">"throwing:class=%s;method=%s;"</span><span class="o">,</span>
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<span class="n">advice</span><span class="o">.</span><span class="na">getClazz</span><span class="o">().</span><span class="na">getSimpleName</span><span class="o">(),</span>
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<span class="n">advice</span><span class="o">.</span><span class="na">getMethod</span><span class="o">().</span><span class="na">getName</span><span class="o">()))</span>
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<span class="o">}</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>Run the script like this:</p>
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<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>$ 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<span class="o">(</span>class-cnt:1 , method-cnt:1<span class="o">)</span> cost in <span class="m">102</span> ms.
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before:class<span class="o">=</span>IbatisProductDao<span class="p">;</span><span class="nv">method</span><span class="o">=</span>getProductById<span class="p">;</span><span class="nv">paramslen</span><span class="o">=</span><span class="m">1</span><span class="p">;</span><span class="o">[</span>Ljava.lang.Object<span class="p">;</span>@45df64fc<span class="p">;</span>
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returning:class<span class="o">=</span>IbatisProductDao<span class="p">;</span><span class="nv">method</span><span class="o">=</span>getProductById<span class="p">;</span>
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before:class<span class="o">=</span>IbatisProductDao<span class="p">;</span><span class="nv">method</span><span class="o">=</span>getProductById<span class="p">;</span><span class="nv">paramslen</span><span class="o">=</span><span class="m">1</span><span class="p">;</span><span class="o">[</span>Ljava.lang.Object<span class="p">;</span>@5b0e2d00<span class="p">;</span>
|
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returning:class<span class="o">=</span>IbatisProductDao<span class="p">;</span><span class="nv">method</span><span class="o">=</span>getProductById<span class="p">;</span>
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</pre></div>
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