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<li class="toctree-l4"><a class="reference internal" href="#check-in-parameters">Check <code class="docutils literal notranslate"><span class="pre">in</span> <span class="pre">parameters</span></code></a></li>
<li class="toctree-l4"><a class="reference internal" href="#check-before-and-after-at-the-same-time">Check <em>before</em> and <em>after</em> at the same time</a></li>
<li class="toctree-l4"><a class="reference internal" href="#use-x-to-check-more-details">Use <code class="docutils literal notranslate"><span class="pre">-x</span></code> to check more details</a></li>
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  <div class="section" id="watch">
<h1>watch<a class="headerlink" href="#watch" title="Permalink to this headline">¶</a></h1>
<p>Monitor methods in data aspect including <code class="docutils literal notranslate"><span class="pre">return</span> <span class="pre">values</span></code>, <code class="docutils literal notranslate"><span class="pre">exceptions</span></code> and <code class="docutils literal notranslate"><span class="pre">parameters</span></code>.</p>
<p>With the help of <a class="reference external" href="https://commons.apache.org/proper/commons-ognl/index.html">OGNL</a>, you can easily check the details of variables when methods being invoked.</p>
<div class="section" id="parameters-options">
<h2>Parameters &amp; Options<a class="headerlink" href="#parameters-options" title="Permalink to this headline">¶</a></h2>
<p>There are four different scenarios for <code class="docutils literal notranslate"><span class="pre">watch</span></code> command, which makes it rather complicated.</p>
<table border="1" class="docutils">
<thead>
<tr>
<th align="right">Name</th>
<th align="left">Specification</th>
</tr>
</thead>
<tbody>
<tr>
<td align="right"><em>class-pattern</em></td>
<td align="left">pattern for the class name</td>
</tr>
<tr>
<td align="right"><em>method-pattern</em></td>
<td align="left">pattern for the method name</td>
</tr>
<tr>
<td align="right"><em>expression</em></td>
<td align="left">expression to monitor</td>
</tr>
<tr>
<td align="right"><em>condition-expression</em></td>
<td align="left">condition expression to filter</td>
</tr>
<tr>
<td align="right">[b]</td>
<td align="left">before method being invoked</td>
</tr>
<tr>
<td align="right">[e]</td>
<td align="left">when method encountering exceptions</td>
</tr>
<tr>
<td align="right">[s]</td>
<td align="left">when method exits normally</td>
</tr>
<tr>
<td align="right">[f]</td>
<td align="left">when method exits (either succeed or fail with exceptions)</td>
</tr>
<tr>
<td align="right">[E]</td>
<td align="left">turn on regex matching while the default is wildcard matching</td>
</tr>
<tr>
<td align="right">[x:]</td>
<td align="left">the depth to print the specified property with default value: 1</td>
</tr>
</tbody>
</table><p>F.Y.I</p>
<ol class="simple">
<li><p>any valid OGNL expression as <code class="docutils literal notranslate"><span class="pre">&quot;{params,returnObj}&quot;</span></code> supported</p></li>
<li><p>there are four <em>watching</em> points: <code class="docutils literal notranslate"><span class="pre">-b</span></code>, <code class="docutils literal notranslate"><span class="pre">-e</span></code>, <code class="docutils literal notranslate"><span class="pre">-s</span></code> and <code class="docutils literal notranslate"><span class="pre">-f</span></code> (the first three are off in default while <code class="docutils literal notranslate"><span class="pre">-f</span></code> on);</p></li>
<li><p>at the <em>watching</em> point, Arthas will use the <em>expression</em> to evaluate the variables and print them out;</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">in</span> <span class="pre">parameters</span></code> and <code class="docutils literal notranslate"><span class="pre">out</span> <span class="pre">parameters</span></code> are different since they can be modified within the invoked methods; <code class="docutils literal notranslate"><span class="pre">params</span></code> stands for <code class="docutils literal notranslate"><span class="pre">in</span> <span class="pre">parameters</span></code> in <code class="docutils literal notranslate"><span class="pre">-b</span></code>while <code class="docutils literal notranslate"><span class="pre">out</span> <span class="pre">parameters</span></code> in other <em>watching</em> points;</p></li>
<li><p>there are no <code class="docutils literal notranslate"><span class="pre">return</span> <span class="pre">values</span></code> and <code class="docutils literal notranslate"><span class="pre">exceptions</span></code> when using <code class="docutils literal notranslate"><span class="pre">-b</span></code>.</p></li>
</ol>
<p>Advanced:</p>
<div class="toctree-wrapper compound">
<ul>
<li class="toctree-l1"><a class="reference internal" href="advice-class.html">Critical fields in</a></li>
<li class="toctree-l1"><a class="reference external" href="https://github.com/alibaba/arthas/issues/71">Special usages</a></li>
<li class="toctree-l1"><a class="reference external" href="https://commons.apache.org/proper/commons-ognl/language-guide.html">OGNL official guide</a></li>
</ul>
</div>
</div>
<div class="section" id="usage">
<h2>Usage<a class="headerlink" href="#usage" title="Permalink to this headline">¶</a></h2>
<div class="section" id="start-demo">
<h3>Start Demo<a class="headerlink" href="#start-demo" title="Permalink to this headline">¶</a></h3>
<p>Start <code class="docutils literal notranslate"><span class="pre">arthas-demo</span></code> in <a class="reference internal" href="quick-start.html"><span class="doc">Quick Start</span></a>.</p>
</div>
<div class="section" id="check-the-out-parameters-and-return-value">
<h3>Check the <code class="docutils literal notranslate"><span class="pre">out</span> <span class="pre">parameters</span></code> and <code class="docutils literal notranslate"><span class="pre">return</span> <span class="pre">value</span></code><a class="headerlink" href="#check-the-out-parameters-and-return-value" title="Permalink to this headline">¶</a></h3>
<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ watch demo.MathGame primeFactors &quot;{params,returnObj}&quot; -x 2
Press Ctrl+C to abort.
Affect(class-cnt:1 , method-cnt:1) cost in 44 ms.
ts=2018-12-03 19:16:51; [cost=1.280502ms] result=@ArrayList[
    @Object[][
        @Integer[535629513],
    ],
    @ArrayList[
        @Integer[3],
        @Integer[19],
        @Integer[191],
        @Integer[49199],
    ],
]</pre></div>
</div>
</div>
<div class="section" id="check-in-parameters">
<h3>Check <code class="docutils literal notranslate"><span class="pre">in</span> <span class="pre">parameters</span></code><a class="headerlink" href="#check-in-parameters" title="Permalink to this headline">¶</a></h3>
<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ watch demo.MathGame primeFactors &quot;{params,returnObj}&quot; -x 2 -b
Press Ctrl+C to abort.
Affect(class-cnt:1 , method-cnt:1) cost in 50 ms.
ts=2018-12-03 19:23:23; [cost=0.0353ms] result=@ArrayList[
    @Object[][
        @Integer[-1077465243],
    ],
    null,
]</pre></div>
</div>
<p>Compared to the previous <em>check</em>:</p>
<ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">return</span> <span class="pre">value</span></code> is <code class="docutils literal notranslate"><span class="pre">null</span></code> since it’s <code class="docutils literal notranslate"><span class="pre">-b</span></code>.</p></li>
</ul>
</div>
<div class="section" id="check-before-and-after-at-the-same-time">
<h3>Check <em>before</em> and <em>after</em> at the same time<a class="headerlink" href="#check-before-and-after-at-the-same-time" title="Permalink to this headline">¶</a></h3>
<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ watch demo.MathGame primeFactors &quot;{params,target,returnObj}&quot; -x 2 -b -s -n 2
Press Ctrl+C to abort.
Affect(class-cnt:1 , method-cnt:1) cost in 46 ms.
ts=2018-12-03 19:29:54; [cost=0.01696ms] result=@ArrayList[
    @Object[][
        @Integer[1544665400],
    ],
    @MathGame[
        random=@Random[java.util.Random@522b408a],
        illegalArgumentCount=@Integer[13038],
    ],
    null,
]
ts=2018-12-03 19:29:54; [cost=4.277392ms] result=@ArrayList[
    @Object[][
        @Integer[1544665400],
    ],
    @MathGame[
        random=@Random[java.util.Random@522b408a],
        illegalArgumentCount=@Integer[13038],
    ],
    @ArrayList[
        @Integer[2],
        @Integer[2],
        @Integer[2],
        @Integer[5],
        @Integer[5],
        @Integer[73],
        @Integer[241],
        @Integer[439],
    ],
]</pre></div>
</div>
<p>F.Y.I</p>
<ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">-n</span> <span class="pre">2</span></code>: threshold of execution times is 2.</p></li>
<li><p>the first block of output is the <em>before watching</em> point;</p></li>
<li><p>*the order of the output determined by the <em>watching</em> order itself (nothing to do with the order of the options <code class="docutils literal notranslate"><span class="pre">-b</span> <span class="pre">-s</span></code>).</p></li>
</ul>
</div>
<div class="section" id="use-x-to-check-more-details">
<h3>Use <code class="docutils literal notranslate"><span class="pre">-x</span></code> to check more details<a class="headerlink" href="#use-x-to-check-more-details" title="Permalink to this headline">¶</a></h3>
<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ watch demo.MathGame primeFactors &quot;{params,target}&quot; -x 3
Press Ctrl+C to abort.
Affect(class-cnt:1 , method-cnt:1) cost in 58 ms.
ts=2018-12-03 19:34:19; [cost=0.587833ms] result=@ArrayList[
    @Object[][
        @Integer[47816758],
    ],
    @MathGame[
        random=@Random[
            serialVersionUID=@Long[3905348978240129619],
            seed=@AtomicLong[3133719055989],
            multiplier=@Long[25214903917],
            addend=@Long[11],
            mask=@Long[281474976710655],
            DOUBLE_UNIT=@Double[1.1102230246251565E-16],
            BadBound=@String[bound must be positive],
            BadRange=@String[bound must be greater than origin],
            BadSize=@String[size must be non-negative],
            seedUniquifier=@AtomicLong[-3282039941672302964],
            nextNextGaussian=@Double[0.0],
            haveNextNextGaussian=@Boolean[false],
            serialPersistentFields=@ObjectStreamField[][isEmpty=false;size=3],
            unsafe=@Unsafe[sun.misc.Unsafe@2eaa1027],
            seedOffset=@Long[24],
        ],
        illegalArgumentCount=@Integer[13159],
    ],
]</pre></div>
</div>
<ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">-x</span></code>: Expand level of object (1 by default)</p></li>
</ul>
</div>
<div class="section" id="use-condition-expressions-to-locate-specific-call">
<h3>Use condition expressions to locate specific call<a class="headerlink" href="#use-condition-expressions-to-locate-specific-call" title="Permalink to this headline">¶</a></h3>
<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ watch demo.MathGame primeFactors &quot;{params[0],target}&quot; &quot;params[0]&lt;0&quot;
Press Ctrl+C to abort.
Affect(class-cnt:1 , method-cnt:1) cost in 68 ms.
ts=2018-12-03 19:36:04; [cost=0.530255ms] result=@ArrayList[
    @Integer[-18178089],
    @MathGame[demo.MathGame@41cf53f9],
]</pre></div>
</div>
</div>
<div class="section" id="check-exceptions">
<h3>Check <code class="docutils literal notranslate"><span class="pre">exceptions</span></code><a class="headerlink" href="#check-exceptions" title="Permalink to this headline">¶</a></h3>
<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ watch demo.MathGame primeFactors &quot;{params[0],throwExp}&quot; -e -x 2
Press Ctrl+C to abort.
Affect(class-cnt:1 , method-cnt:1) cost in 62 ms.
ts=2018-12-03 19:38:00; [cost=1.414993ms] result=@ArrayList[
    @Integer[-1120397038],
    java.lang.IllegalArgumentException: number is: -1120397038, need &gt;= 2
	at demo.MathGame.primeFactors(MathGame.java:46)
	at demo.MathGame.run(MathGame.java:24)
	at demo.MathGame.main(MathGame.java:16)
,
]</pre></div>
</div>
<ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">-e</span></code>: Trigger when an exception is thrown</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">throwExp</span></code>: the exception object</p></li>
</ul>
</div>
<div class="section" id="filter-by-time-cost">
<h3>Filter by time cost<a class="headerlink" href="#filter-by-time-cost" title="Permalink to this headline">¶</a></h3>
<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ watch demo.MathGame primeFactors &#x27;{params, returnObj}&#x27; &#x27;#cost&gt;200&#x27; -x 2
Press Ctrl+C to abort.
Affect(class-cnt:1 , method-cnt:1) cost in 66 ms.
ts=2018-12-03 19:40:28; [cost=2112.168897ms] result=@ArrayList[
    @Object[][
        @Integer[2141897465],
    ],
    @ArrayList[
        @Integer[5],
        @Integer[428379493],
    ],
]</pre></div>
</div>
<ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">#cost&gt;200</span></code> (<code class="docutils literal notranslate"><span class="pre">ms</span></code>) filter out all invokings that take less than <code class="docutils literal notranslate"><span class="pre">200ms</span></code>.</p></li>
</ul>
</div>
<div class="section" id="check-the-field-of-the-target-object">
<h3>Check the field of the target object<a class="headerlink" href="#check-the-field-of-the-target-object" title="Permalink to this headline">¶</a></h3>
<ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">target</span></code> is the <code class="docutils literal notranslate"><span class="pre">this</span></code> object in java.</p></li>
</ul>
<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ watch demo.MathGame primeFactors &#x27;target&#x27;
Press Ctrl+C to abort.
Affect(class-cnt:1 , method-cnt:1) cost in 52 ms.
ts=2018-12-03 19:41:52; [cost=0.477882ms] result=@MathGame[
    random=@Random[java.util.Random@522b408a],
    illegalArgumentCount=@Integer[13355],
]</pre></div>
</div>
<ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">target.field_name</span></code>: the field of the current object.</p></li>
</ul>
<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ watch demo.MathGame primeFactors &#x27;target.illegalArgumentCount&#x27;
Press Ctrl+C to abort.
Affect(class-cnt:1 , method-cnt:1) cost in 67 ms.
ts=2018-12-03 20:04:34; [cost=131.303498ms] result=@Integer[8]
ts=2018-12-03 20:04:35; [cost=0.961441ms] result=@Integer[8]</pre></div>
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+								<h1>watch<a class="headerlink" href="#watch" title="Permalink to this headline">¶</a></h1>
 								<p>Monitor methods in data aspect including <code class="docutils literal notranslate"><span class="pre">return</span> <span class="pre">values</span></code>, <code class="docutils literal notranslate"><span class="pre">exceptions</span></code> and <code class="docutils literal notranslate"><span class="pre">parameters</span></code>.</p>
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+								<p>With the help of <a class="reference external" href="https://commons.apache.org/proper/commons-ognl/index.html">OGNL</a>, you can easily check the details of variables when methods being invoked.</p>
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+								<h2>Parameters &amp; Options<a class="headerlink" href="#parameters-options" title="Permalink to this headline">¶</a></h2>
 								<p>There are four different scenarios for <code class="docutils literal notranslate"><span class="pre">watch</span></code> command, which makes it rather complicated.</p>
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+								<table border="1" class="docutils">
 								<thead>
 								<tr>
 								<th align="right">Name</th>
 								<th align="left">Specification</th>
 								</tr>
 								</thead>
 								<tbody>
 								<tr>
 								<td align="right"><em>class-pattern</em></td>
 								<td align="left">pattern for the class name</td>
 								</tr>
 								<tr>
 								<td align="right"><em>method-pattern</em></td>
 								<td align="left">pattern for the method name</td>
 								</tr>
 								<tr>
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+								<td align="right"><em>expression</em></td>
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+								<td align="left">expression to monitor</td>
 								</tr>
 								<tr>
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+								<td align="right"><em>condition-expression</em></td>
 								<td align="left">condition expression to filter</td>
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+								</tr>
 								<tr>
 								<td align="right">[b]</td>
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+								<td align="left">before method being invoked</td>
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+								</tr>
 								<tr>
 								<td align="right">[e]</td>
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+								<td align="left">when method encountering exceptions</td>
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+								</tr>
 								<tr>
 								<td align="right">[s]</td>
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+								<td align="left">when method exits normally</td>
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+								</tr>
 								<tr>
 								<td align="right">[f]</td>
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+								<td align="left">when method exits (either succeed or fail with exceptions)</td>
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+								</tr>
 								<tr>
 								<td align="right">[E]</td>
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+								<td align="left">turn on regex matching while the default is wildcard matching</td>
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+								</tr>
 								<tr>
 								<td align="right">[x:]</td>
 								<td align="left">the depth to print the specified property with default value: 1</td>
 								</tr>
 								</tbody>
 								</table><p>F.Y.I</p>
 								<ol class="simple">
-												update doc 3.1.2

											
										
										
											5 years ago
+								<li><p>any valid OGNL expression as <code class="docutils literal notranslate"><span class="pre">&quot;{params,returnObj}&quot;</span></code> supported</p></li>
 								<li><p>there are four <em>watching</em> points: <code class="docutils literal notranslate"><span class="pre">-b</span></code>, <code class="docutils literal notranslate"><span class="pre">-e</span></code>, <code class="docutils literal notranslate"><span class="pre">-s</span></code> and <code class="docutils literal notranslate"><span class="pre">-f</span></code> (the first three are off in default while <code class="docutils literal notranslate"><span class="pre">-f</span></code> on);</p></li>
 								<li><p>at the <em>watching</em> point, Arthas will use the <em>expression</em> to evaluate the variables and print them out;</p></li>
 								<li><p><code class="docutils literal notranslate"><span class="pre">in</span> <span class="pre">parameters</span></code> and <code class="docutils literal notranslate"><span class="pre">out</span> <span class="pre">parameters</span></code> are different since they can be modified within the invoked methods; <code class="docutils literal notranslate"><span class="pre">params</span></code> stands for <code class="docutils literal notranslate"><span class="pre">in</span> <span class="pre">parameters</span></code> in <code class="docutils literal notranslate"><span class="pre">-b</span></code>while <code class="docutils literal notranslate"><span class="pre">out</span> <span class="pre">parameters</span></code> in other <em>watching</em> points;</p></li>
 								<li><p>there are no <code class="docutils literal notranslate"><span class="pre">return</span> <span class="pre">values</span></code> and <code class="docutils literal notranslate"><span class="pre">exceptions</span></code> when using <code class="docutils literal notranslate"><span class="pre">-b</span></code>.</p></li>
-												update doc

											
										
										
											6 years ago
+								</ol>
 								<p>Advanced:</p>
 								<div class="toctree-wrapper compound">
 								<ul>
-												update doc

											
										
										
											6 years ago
+								<li class="toctree-l1"><a class="reference internal" href="advice-class.html">Critical fields in</a></li>
 								<li class="toctree-l1"><a class="reference external" href="https://github.com/alibaba/arthas/issues/71">Special usages</a></li>
-												update doc

											
										
										
											6 years ago
+								<li class="toctree-l1"><a class="reference external" href="https://commons.apache.org/proper/commons-ognl/language-guide.html">OGNL official guide</a></li>
 								</ul>
 								</div>
 								</div>
 								<div class="section" id="usage">
-												update doc 3.1.2

											
										
										
											5 years ago
+								<h2>Usage<a class="headerlink" href="#usage" title="Permalink to this headline">¶</a></h2>
-												update doc

											
										
										
											6 years ago
+								<div class="section" id="start-demo">
-												update doc 3.1.2

											
										
										
											5 years ago
+								<h3>Start Demo<a class="headerlink" href="#start-demo" title="Permalink to this headline">¶</a></h3>
 								<p>Start <code class="docutils literal notranslate"><span class="pre">arthas-demo</span></code> in <a class="reference internal" href="quick-start.html"><span class="doc">Quick Start</span></a>.</p>
-												update doc

											
										
										
											6 years ago
+								</div>
-												update doc

											
										
										
											6 years ago
+								<div class="section" id="check-the-out-parameters-and-return-value">
-												update doc 3.1.2

											
										
										
											5 years ago
+								<h3>Check the <code class="docutils literal notranslate"><span class="pre">out</span> <span class="pre">parameters</span></code> and <code class="docutils literal notranslate"><span class="pre">return</span> <span class="pre">value</span></code><a class="headerlink" href="#check-the-out-parameters-and-return-value" title="Permalink to this headline">¶</a></h3>
-												new site style

											
										
										
											6 years ago
+								<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ watch demo.MathGame primeFactors &quot;{params,returnObj}&quot; -x 2
-												update doc

											
										
										
											6 years ago
+								Press Ctrl+C to abort.
-												new site style

											
										
										
											6 years ago
+								Affect(class-cnt:1 , method-cnt:1) cost in 44 ms.
 								ts=2018-12-03 19:16:51; [cost=1.280502ms] result=@ArrayList[
 								    @Object[][
 								        @Integer[535629513],
 								    ],
 								    @ArrayList[
 								        @Integer[3],
 								        @Integer[19],
 								        @Integer[191],
 								        @Integer[49199],
 								    ],
-												update doc 3.1.2

											
										
										
											5 years ago
+								]</pre></div>
-												update doc

											
										
										
											6 years ago
+								</div>
 								</div>
 								<div class="section" id="check-in-parameters">
-												update doc 3.1.2

											
										
										
											5 years ago
+								<h3>Check <code class="docutils literal notranslate"><span class="pre">in</span> <span class="pre">parameters</span></code><a class="headerlink" href="#check-in-parameters" title="Permalink to this headline">¶</a></h3>
-												new site style

											
										
										
											6 years ago
+								<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ watch demo.MathGame primeFactors &quot;{params,returnObj}&quot; -x 2 -b
-												update doc

											
										
										
											6 years ago
+								Press Ctrl+C to abort.
-												new site style

											
										
										
											6 years ago
+								Affect(class-cnt:1 , method-cnt:1) cost in 50 ms.
 								ts=2018-12-03 19:23:23; [cost=0.0353ms] result=@ArrayList[
 								    @Object[][
 								        @Integer[-1077465243],
 								    ],
-												update doc

											
										
										
											6 years ago
+								    null,
-												update doc 3.1.2

											
										
										
											5 years ago
+								]</pre></div>
-												update doc

											
										
										
											6 years ago
+								</div>
-												update doc

											
										
										
											6 years ago
+								<p>Compared to the previous <em>check</em>:</p>
 								<ul class="simple">
-												update doc 3.1.2

											
										
										
											5 years ago
+								<li><p><code class="docutils literal notranslate"><span class="pre">return</span> <span class="pre">value</span></code> is <code class="docutils literal notranslate"><span class="pre">null</span></code> since it’s <code class="docutils literal notranslate"><span class="pre">-b</span></code>.</p></li>
-												update doc

											
										
										
											6 years ago
+								</ul>
-												update doc

											
										
										
											6 years ago
+								</div>
 								<div class="section" id="check-before-and-after-at-the-same-time">
-												update doc 3.1.2

											
										
										
											5 years ago
+								<h3>Check <em>before</em> and <em>after</em> at the same time<a class="headerlink" href="#check-before-and-after-at-the-same-time" title="Permalink to this headline">¶</a></h3>
-												new site style

											
										
										
											6 years ago
+								<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ watch demo.MathGame primeFactors &quot;{params,target,returnObj}&quot; -x 2 -b -s -n 2
-												update doc

											
										
										
											6 years ago
+								Press Ctrl+C to abort.
-												new site style

											
										
										
											6 years ago
+								Affect(class-cnt:1 , method-cnt:1) cost in 46 ms.
 								ts=2018-12-03 19:29:54; [cost=0.01696ms] result=@ArrayList[
 								    @Object[][
 								        @Integer[1544665400],
 								    ],
 								    @MathGame[
 								        random=@Random[java.util.Random@522b408a],
 								        illegalArgumentCount=@Integer[13038],
 								    ],
-												update doc

											
										
										
											6 years ago
+								    null,
-												new site style

											
										
										
											6 years ago
+								]
 								ts=2018-12-03 19:29:54; [cost=4.277392ms] result=@ArrayList[
 								    @Object[][
 								        @Integer[1544665400],
 								    ],
 								    @MathGame[
 								        random=@Random[java.util.Random@522b408a],
 								        illegalArgumentCount=@Integer[13038],
 								    ],
 								    @ArrayList[
 								        @Integer[2],
 								        @Integer[2],
 								        @Integer[2],
 								        @Integer[5],
 								        @Integer[5],
 								        @Integer[73],
 								        @Integer[241],
 								        @Integer[439],
 								    ],
-												update doc 3.1.2

											
										
										
											5 years ago
+								]</pre></div>
-												update doc

											
										
										
											6 years ago
+								</div>
 								<p>F.Y.I</p>
-												update doc

											
										
										
											6 years ago
+								<ul class="simple">
-												update doc 3.1.2

											
										
										
											5 years ago
+								<li><p><code class="docutils literal notranslate"><span class="pre">-n</span> <span class="pre">2</span></code>: threshold of execution times is 2.</p></li>
 								<li><p>the first block of output is the <em>before watching</em> point;</p></li>
 								<li><p>*the order of the output determined by the <em>watching</em> order itself (nothing to do with the order of the options <code class="docutils literal notranslate"><span class="pre">-b</span> <span class="pre">-s</span></code>).</p></li>
-												update doc

											
										
										
											6 years ago
+								</ul>
-												update doc

											
										
										
											6 years ago
+								</div>
-												update doc

											
										
										
											6 years ago
+								<div class="section" id="use-x-to-check-more-details">
-												update doc 3.1.2

											
										
										
											5 years ago
+								<h3>Use <code class="docutils literal notranslate"><span class="pre">-x</span></code> to check more details<a class="headerlink" href="#use-x-to-check-more-details" title="Permalink to this headline">¶</a></h3>
-												new site style

											
										
										
											6 years ago
+								<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ watch demo.MathGame primeFactors &quot;{params,target}&quot; -x 3
-												update doc

											
										
										
											6 years ago
+								Press Ctrl+C to abort.
-												new site style

											
										
										
											6 years ago
+								Affect(class-cnt:1 , method-cnt:1) cost in 58 ms.
 								ts=2018-12-03 19:34:19; [cost=0.587833ms] result=@ArrayList[
 								    @Object[][
 								        @Integer[47816758],
 								    ],
 								    @MathGame[
 								        random=@Random[
 								            serialVersionUID=@Long[3905348978240129619],
 								            seed=@AtomicLong[3133719055989],
 								            multiplier=@Long[25214903917],
 								            addend=@Long[11],
 								            mask=@Long[281474976710655],
 								            DOUBLE_UNIT=@Double[1.1102230246251565E-16],
 								            BadBound=@String[bound must be positive],
 								            BadRange=@String[bound must be greater than origin],
 								            BadSize=@String[size must be non-negative],
 								            seedUniquifier=@AtomicLong[-3282039941672302964],
 								            nextNextGaussian=@Double[0.0],
 								            haveNextNextGaussian=@Boolean[false],
 								            serialPersistentFields=@ObjectStreamField[][isEmpty=false;size=3],
 								            unsafe=@Unsafe[sun.misc.Unsafe@2eaa1027],
 								            seedOffset=@Long[24],
 								        ],
 								        illegalArgumentCount=@Integer[13159],
 								    ],
-												update doc 3.1.2

											
										
										
											5 years ago
+								]</pre></div>
-												update doc

											
										
										
											6 years ago
+								</div>
-												update doc

											
										
										
											6 years ago
+								<ul class="simple">
-												update doc 3.1.2

											
										
										
											5 years ago
+								<li><p><code class="docutils literal notranslate"><span class="pre">-x</span></code>: Expand level of object (1 by default)</p></li>
-												update doc

											
										
										
											6 years ago
+								</ul>
-												update doc

											
										
										
											6 years ago
+								</div>
-												update doc

											
										
										
											6 years ago
+								<div class="section" id="use-condition-expressions-to-locate-specific-call">
-												update doc 3.1.2

											
										
										
											5 years ago
+								<h3>Use condition expressions to locate specific call<a class="headerlink" href="#use-condition-expressions-to-locate-specific-call" title="Permalink to this headline">¶</a></h3>
-												new site style

											
										
										
											6 years ago
+								<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ watch demo.MathGame primeFactors &quot;{params[0],target}&quot; &quot;params[0]&lt;0&quot;
-												update doc

											
										
										
											6 years ago
+								Press Ctrl+C to abort.
-												new site style

											
										
										
											6 years ago
+								Affect(class-cnt:1 , method-cnt:1) cost in 68 ms.
 								ts=2018-12-03 19:36:04; [cost=0.530255ms] result=@ArrayList[
 								    @Integer[-18178089],
 								    @MathGame[demo.MathGame@41cf53f9],
-												update doc 3.1.2

											
										
										
											5 years ago
+								]</pre></div>
-												update doc

											
										
										
											6 years ago
+								</div>
 								</div>
 								<div class="section" id="check-exceptions">
-												update doc 3.1.2

											
										
										
											5 years ago
+								<h3>Check <code class="docutils literal notranslate"><span class="pre">exceptions</span></code><a class="headerlink" href="#check-exceptions" title="Permalink to this headline">¶</a></h3>
-												new site style

											
										
										
											6 years ago
+								<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ watch demo.MathGame primeFactors &quot;{params[0],throwExp}&quot; -e -x 2
-												update doc

											
										
										
											6 years ago
+								Press Ctrl+C to abort.
-												new site style

											
										
										
											6 years ago
+								Affect(class-cnt:1 , method-cnt:1) cost in 62 ms.
 								ts=2018-12-03 19:38:00; [cost=1.414993ms] result=@ArrayList[
 								    @Integer[-1120397038],
 								    java.lang.IllegalArgumentException: number is: -1120397038, need &gt;= 2
-												update doc 3.1.2

											
										
										
											5 years ago
+									at demo.MathGame.primeFactors(MathGame.java:46)
 									at demo.MathGame.run(MathGame.java:24)
 									at demo.MathGame.main(MathGame.java:16)
-												update doc

											
										
										
											6 years ago
+								,
-												update doc 3.1.2

											
										
										
											5 years ago
+								]</pre></div>
-												update doc

											
										
										
											6 years ago
+								</div>
-												update doc

											
										
										
											6 years ago
+								<ul class="simple">
-												update doc 3.1.2

											
										
										
											5 years ago
+								<li><p><code class="docutils literal notranslate"><span class="pre">-e</span></code>: Trigger when an exception is thrown</p></li>
 								<li><p><code class="docutils literal notranslate"><span class="pre">throwExp</span></code>: the exception object</p></li>
-												update doc

											
										
										
											6 years ago
+								</ul>
-												update doc

											
										
										
											6 years ago
+								</div>
-												update doc

											
										
										
											6 years ago
+								<div class="section" id="filter-by-time-cost">
-												update doc 3.1.2

											
										
										
											5 years ago
+								<h3>Filter by time cost<a class="headerlink" href="#filter-by-time-cost" title="Permalink to this headline">¶</a></h3>
-												new site style

											
										
										
											6 years ago
+								<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ watch demo.MathGame primeFactors &#x27;{params, returnObj}&#x27; &#x27;#cost&gt;200&#x27; -x 2
-												update doc

											
										
										
											6 years ago
+								Press Ctrl+C to abort.
-												new site style

											
										
										
											6 years ago
+								Affect(class-cnt:1 , method-cnt:1) cost in 66 ms.
 								ts=2018-12-03 19:40:28; [cost=2112.168897ms] result=@ArrayList[
 								    @Object[][
 								        @Integer[2141897465],
 								    ],
 								    @ArrayList[
 								        @Integer[5],
 								        @Integer[428379493],
 								    ],
-												update doc 3.1.2

											
										
										
											5 years ago
+								]</pre></div>
-												update doc

											
										
										
											6 years ago
+								</div>
-												update doc

											
										
										
											6 years ago
+								<ul class="simple">
-												update doc 3.1.2

											
										
										
											5 years ago
+								<li><p><code class="docutils literal notranslate"><span class="pre">#cost&gt;200</span></code> (<code class="docutils literal notranslate"><span class="pre">ms</span></code>) filter out all invokings that take less than <code class="docutils literal notranslate"><span class="pre">200ms</span></code>.</p></li>
-												update doc

											
										
										
											6 years ago
+								</ul>
-												update doc

											
										
										
											6 years ago
+								</div>
-												update doc

											
										
										
											6 years ago
+								<div class="section" id="check-the-field-of-the-target-object">
-												update doc 3.1.2

											
										
										
											5 years ago
+								<h3>Check the field of the target object<a class="headerlink" href="#check-the-field-of-the-target-object" title="Permalink to this headline">¶</a></h3>
-												update doc

											
										
										
											6 years ago
+								<ul class="simple">
-												update doc 3.1.2

											
										
										
											5 years ago
+								<li><p><code class="docutils literal notranslate"><span class="pre">target</span></code> is the <code class="docutils literal notranslate"><span class="pre">this</span></code> object in java.</p></li>
-												update doc

											
										
										
											6 years ago
+								</ul>
-												new site style

											
										
										
											6 years ago
+								<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ watch demo.MathGame primeFactors &#x27;target&#x27;
-												update doc

											
										
										
											6 years ago
+								Press Ctrl+C to abort.
-												new site style

											
										
										
											6 years ago
+								Affect(class-cnt:1 , method-cnt:1) cost in 52 ms.
 								ts=2018-12-03 19:41:52; [cost=0.477882ms] result=@MathGame[
 								    random=@Random[java.util.Random@522b408a],
 								    illegalArgumentCount=@Integer[13355],
-												update doc 3.1.2

											
										
										
											5 years ago
+								]</pre></div>
-												update doc

											
										
										
											6 years ago
+								</div>
-												update doc

											
										
										
											6 years ago
+								<ul class="simple">
-												update doc 3.1.2

											
										
										
											5 years ago
+								<li><p><code class="docutils literal notranslate"><span class="pre">target.field_name</span></code>: the field of the current object.</p></li>
-												update doc

											
										
										
											6 years ago
+								</ul>
-												new site style

											
										
										
											6 years ago
+								<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ watch demo.MathGame primeFactors &#x27;target.illegalArgumentCount&#x27;
-												update doc

											
										
										
											6 years ago
+								Press Ctrl+C to abort.
-												new site style

											
										
										
											6 years ago
+								Affect(class-cnt:1 , method-cnt:1) cost in 67 ms.
 								ts=2018-12-03 20:04:34; [cost=131.303498ms] result=@Integer[8]
-												update doc 3.1.2

											
										
										
											5 years ago
+								ts=2018-12-03 20:04:35; [cost=0.961441ms] result=@Integer[8]</pre></div>
-												update doc

											
										
										
											6 years ago
+								</div>
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 								    <div class="rst-footer-buttons" role="navigation" aria-label="footer navigation">
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+								        <a href="advice-class.html" class="btn btn-neutral float-right" title="Fundamental Fields in Expressions" accesskey="n" rel="next">Next <span class="fa fa-arrow-circle-right"></span></a>
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+								        <a href="monitor.html" class="btn btn-neutral float-left" title="monitor" accesskey="p" rel="prev"><span class="fa fa-arrow-circle-left"></span> Previous</a>
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+								        &copy; Copyright 2018-2019, Alibaba Middleware Group, and contributors
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+								<div class="github-fork-ribbon-wrapper right">
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+								    <a href="https://github.com/alibaba/arthas" target="_blank">Fork me at GitHub</a>
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											6 years ago
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