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<div class="section" id="watch">
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<span id="watch"></span><h1>watch<a class="headerlink" href="#watch" title="Permalink to this headline">¶</a></h1>
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<p>Monitor methods in data aspect including <tt class="docutils literal">return values</tt>, <tt class="docutils literal">exceptions</tt> and <tt class="docutils literal">parameters</tt>.</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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<div class="section" id="parameters-options">
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<span id="parameters-options"></span><h2>Parameters & Options<a class="headerlink" href="#parameters-options" title="Permalink to this headline">¶</a></h2>
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<p>There are four different scenarios for <tt class="docutils literal">watch</tt> command, which makes it rather complicated.</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"><em>class-pattern</em></td>
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<td align="left">pattern for the class name</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">pattern for the method name</td>
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</tr>
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<tr>
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<td align="right"><em>expression</em></td>
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<td align="left">expression to monitor</td>
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</tr>
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<tr>
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<td align="right"><em>condition-expression</em></td>
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<td align="left">condition expression to filter</td>
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</tr>
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<tr>
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<td align="right">[b]</td>
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<td align="left">before method being invoked</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">when method encountering exceptions</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">when method exits normally</td>
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</tr>
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<tr>
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<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>
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<tr>
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<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>
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<tr>
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<td align="right">[x:]</td>
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<td align="left">the depth to print the specified property with default value: 1</td>
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</tr>
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</tbody>
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</table><p>F.Y.I</p>
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<ol class="simple">
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<li>any valid OGNL expression as <tt class="docutils literal">"{params,returnObj}"</tt> supported</li>
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<li>there are four <em>watching</em> points: <tt class="docutils literal">-b</tt>, <tt class="docutils literal">-e</tt>, <tt class="docutils literal">-s</tt> and <tt class="docutils literal">-f</tt> (the first three are off in default while <tt class="docutils literal">-f</tt> on);</li>
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<li>at the <em>watching</em> point, Arthas will use the <em>expression</em> to evaluate the variables and print them out;</li>
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<li><tt class="docutils literal">in parameters</tt> and <tt class="docutils literal">out parameters</tt> are different since they can be modified within the invoked methods; <tt class="docutils literal">params</tt> stands for <tt class="docutils literal">in parameters</tt> in <tt class="docutils literal">-b</tt>while <tt class="docutils literal">out parameters</tt> in other <em>watching</em> points;</li>
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<li>there are no <tt class="docutils literal">return values</tt> and <tt class="docutils literal">exceptions</tt> when using <tt class="docutils literal">-b</tt>.</li>
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</ol>
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<p>Advanced:</p>
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<div class="toctree-wrapper compound">
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="advice-class.html">Critical fields in</a></li>
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<li class="toctree-l1"><a class="reference external" href="https://github.com/alibaba/arthas/issues/71">Special usages</a></li>
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<li class="toctree-l1"><a class="reference external" href="https://commons.apache.org/proper/commons-ognl/language-guide.html">OGNL official guide</a></li>
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</ul>
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</div>
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</div>
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<div class="section" id="usage">
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<span id="usage"></span><h2>Usage<a class="headerlink" href="#usage" title="Permalink to this headline">¶</a></h2>
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<div class="section" id="start-demo">
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<span id="start-demo"></span><h3>Start Demo<a class="headerlink" href="#start-demo" title="Permalink to this headline">¶</a></h3>
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<p>Start <tt class="docutils literal">arthas-demo</tt> in <a class="reference internal" href="quick-start.html"><span class="doc">Quick Start</span></a>.</p>
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</div>
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<div class="section" id="check-the-out-parameters-and-return-value">
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<span id="check-the-out-parameters-and-return-value"></span><h3>Check the <tt class="docutils literal">out parameters</tt> and <tt class="docutils literal">return value</tt><a class="headerlink" href="#check-the-out-parameters-and-return-value" title="Permalink to this headline">¶</a></h3>
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ watch demo.MathGame primeFactors "{params,returnObj}" -x 2
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Press Ctrl+C to abort.
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Affect(class-cnt:1 , method-cnt:1) cost in 44 ms.
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ts=2018-12-03 19:16:51; [cost=1.280502ms] result=@ArrayList[
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|
@Object[][
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|
@Integer[535629513],
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|
],
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|
@ArrayList[
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|
@Integer[3],
|
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|
@Integer[19],
|
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|
@Integer[191],
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|
@Integer[49199],
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],
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]
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</pre></div>
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</div>
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</div>
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<div class="section" id="check-in-parameters">
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<span id="check-in-parameters"></span><h3>Check <tt class="docutils literal">in parameters</tt><a class="headerlink" href="#check-in-parameters" title="Permalink to this headline">¶</a></h3>
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ watch demo.MathGame primeFactors "{params,returnObj}" -x 2 -b
|
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Press Ctrl+C to abort.
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|
Affect(class-cnt:1 , method-cnt:1) cost in 50 ms.
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|
ts=2018-12-03 19:23:23; [cost=0.0353ms] result=@ArrayList[
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|
@Object[][
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|
@Integer[-1077465243],
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],
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null,
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]
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</pre></div>
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</div>
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<p>Compared to the previous <em>check</em>:</p>
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<ul class="simple">
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<li><tt class="docutils literal">return value</tt> is <tt class="docutils literal">null</tt> since it’s <tt class="docutils literal">-b</tt>.</li>
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</ul>
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</div>
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<div class="section" id="check-before-and-after-at-the-same-time">
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<span id="check-before-and-after-at-the-same-time"></span><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>
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ watch demo.MathGame primeFactors "{params,target,returnObj}" -x 2 -b -s -n 2
|
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Press Ctrl+C to abort.
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Affect(class-cnt:1 , method-cnt:1) cost in 46 ms.
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ts=2018-12-03 19:29:54; [cost=0.01696ms] result=@ArrayList[
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@Object[][
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|
@Integer[1544665400],
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|
],
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@MathGame[
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random=@Random[java.util.Random@522b408a],
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illegalArgumentCount=@Integer[13038],
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],
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null,
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]
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|
|
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><tt class="docutils literal">-n 2</tt>: threshold of execution times is 2.</li>
|
|
|
<li>the first block of output is the <em>before watching</em> point;</li>
|
|
|
<li>*the order of the output determined by the <em>watching</em> order itself (nothing to do with the order of the options <tt class="docutils literal">-b -s</tt>).</li>
|
|
|
</ul>
|
|
|
</div>
|
|
|
<div class="section" id="use-x-to-check-more-details">
|
|
|
<span id="use-x-to-check-more-details"></span><h3>Use <tt class="docutils literal">-x</tt> 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 "{params,target}" -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><tt class="docutils literal">-x</tt>: Expand level of object (1 by default)</li>
|
|
|
</ul>
|
|
|
</div>
|
|
|
<div class="section" id="use-condition-expressions-to-locate-specific-call">
|
|
|
<span id="use-condition-expressions-to-locate-specific-call"></span><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 "{params[0],target}" "params[0]<0"
|
|
|
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">
|
|
|
<span id="check-exceptions"></span><h3>Check <tt class="docutils literal">exceptions</tt><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 "{params[0],throwExp}" -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 >= 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><tt class="docutils literal">-e</tt>: Trigger when an exception is thrown</li>
|
|
|
<li><tt class="docutils literal">throwExp</tt>: the exception object</li>
|
|
|
</ul>
|
|
|
</div>
|
|
|
<div class="section" id="filter-by-time-cost">
|
|
|
<span id="filter-by-time-cost"></span><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 '{params, returnObj}' '#cost>200' -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><tt class="docutils literal">#cost>200</tt> (<tt class="docutils literal">ms</tt>) filter out all invokings that take less than <tt class="docutils literal">200ms</tt>.</li>
|
|
|
</ul>
|
|
|
</div>
|
|
|
<div class="section" id="check-the-field-of-the-target-object">
|
|
|
<span id="check-the-field-of-the-target-object"></span><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><tt class="docutils literal">target</tt> is the <tt class="docutils literal">this</tt> object in java.</li>
|
|
|
</ul>
|
|
|
<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ watch demo.MathGame primeFactors 'target'
|
|
|
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><tt class="docutils literal">target.field_name</tt>: the field of the current object.</li>
|
|
|
</ul>
|
|
|
<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ watch demo.MathGame primeFactors 'target.illegalArgumentCount'
|
|
|
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>
|
|
|
</div>
|
|
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</div>
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