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3.1.7
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<div class="section" id="watch">
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<h1>watch<a class="headerlink" href="#watch" title="永久链接至标题">¶</a></h1>
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<blockquote>
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<div><p>方法执行数据观测</p>
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</div></blockquote>
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<p>让你能方便的观察到指定方法的调用情况。能观察到的范围为：<code class="docutils literal notranslate"><span class="pre">返回值</span></code>、<code class="docutils literal notranslate"><span class="pre">抛出异常</span></code>、<code class="docutils literal notranslate"><span class="pre">入参</span></code>，通过编写 OGNL 表达式进行对应变量的查看。</p>
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<div class="section" id="id1">
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<h2>参数说明<a class="headerlink" href="#id1" title="永久链接至标题">¶</a></h2>
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<p>watch 的参数比较多，主要是因为它能在 4 个不同的场景观察对象</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">参数名称</th>
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<th align="left">参数说明</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td align="right"><em>class-pattern</em></td>
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<td align="left">类名表达式匹配</td>
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</tr>
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<tr>
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<td align="right"><em>method-pattern</em></td>
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<td align="left">方法名表达式匹配</td>
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</tr>
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<tr>
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<td align="right"><em>express</em></td>
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<td align="left">观察表达式</td>
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</tr>
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<tr>
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<td align="right"><em>condition-express</em></td>
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<td align="left">条件表达式</td>
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</tr>
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<tr>
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<td align="right">[b]</td>
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<td align="left">在<strong>方法调用之前</strong>观察</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">在<strong>方法异常之后</strong>观察</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">在<strong>方法返回之后</strong>观察</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">在<strong>方法结束之后</strong>(正常返回和异常返回)观察</td>
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</tr>
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<tr>
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<td align="right">[E]</td>
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<td align="left">开启正则表达式匹配，默认为通配符匹配</td>
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</tr>
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<tr>
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<td align="right">[x:]</td>
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<td align="left">指定输出结果的属性遍历深度，默认为 1</td>
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</tr>
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</tbody>
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</table><p>这里重点要说明的是观察表达式，观察表达式的构成主要由 ognl 表达式组成，所以你可以这样写<code class="docutils literal notranslate"><span class="pre">"{params,returnObj}"</span></code>，只要是一个合法的 ognl 表达式，都能被正常支持。</p>
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<p>观察的维度也比较多，主要体现在参数 <code class="docutils literal notranslate"><span class="pre">advice</span></code> 的数据结构上。<code class="docutils literal notranslate"><span class="pre">Advice</span></code> 参数最主要是封装了通知节点的所有信息。请参考<a class="reference internal" href="advice-class.html"><span class="doc">表达式核心变量</span></a>中关于该节点的描述。</p>
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<ul class="simple">
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<li><p>特殊用法请参考：<a class="reference external" href="https://github.com/alibaba/arthas/issues/71">https://github.com/alibaba/arthas/issues/71</a></p></li>
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<li><p>OGNL表达式官网：<a class="reference external" href="https://commons.apache.org/proper/commons-ognl/language-guide.html">https://commons.apache.org/proper/commons-ognl/language-guide.html</a></p></li>
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</ul>
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<p><strong>特别说明</strong>：</p>
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<ul class="simple">
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<li><p>watch 命令定义了4个观察事件点，即 <code class="docutils literal notranslate"><span class="pre">-b</span></code> 方法调用前，<code class="docutils literal notranslate"><span class="pre">-e</span></code> 方法异常后，<code class="docutils literal notranslate"><span class="pre">-s</span></code> 方法返回后，<code class="docutils literal notranslate"><span class="pre">-f</span></code> 方法结束后</p></li>
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<li><p>4个观察事件点 <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> 默认关闭，<code class="docutils literal notranslate"><span class="pre">-f</span></code> 默认打开，当指定观察点被打开后，在相应事件点会对观察表达式进行求值并输出</p></li>
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<li><p>这里要注意<code class="docutils literal notranslate"><span class="pre">方法入参</span></code>和<code class="docutils literal notranslate"><span class="pre">方法出参</span></code>的区别，有可能在中间被修改导致前后不一致，除了 <code class="docutils literal notranslate"><span class="pre">-b</span></code> 事件点 <code class="docutils literal notranslate"><span class="pre">params</span></code> 代表方法入参外，其余事件都代表方法出参</p></li>
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<li><p>当使用 <code class="docutils literal notranslate"><span class="pre">-b</span></code> 时，由于观察事件点是在方法调用前，此时返回值或异常均不存在</p></li>
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</ul>
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</div>
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<div class="section" id="id2">
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<h2>使用参考<a class="headerlink" href="#id2" title="永久链接至标题">¶</a></h2>
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<div class="section" id="demo">
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<h3>启动 Demo<a class="headerlink" href="#demo" title="永久链接至标题">¶</a></h3>
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<p>启动<a class="reference internal" href="quick-start.html"><span class="doc">快速入门</span></a>里的<code class="docutils literal notranslate"><span class="pre">arthas-demo</span></code>。</p>
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</div>
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<div class="section" id="id3">
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<h3>观察方法出参和返回值<a class="headerlink" href="#id3" title="永久链接至标题">¶</a></h3>
|
|
|
<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ watch demo.MathGame primeFactors "{params,returnObj}" -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="id4">
|
|
|
<h3>观察方法入参<a class="headerlink" href="#id4" title="永久链接至标题">¶</a></h3>
|
|
|
<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ watch demo.MathGame primeFactors "{params,returnObj}" -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>
|
|
|
<ul class="simple">
|
|
|
<li><p>对比前一个例子，返回值为空（事件点为方法执行前，因此获取不到返回值）</p></li>
|
|
|
</ul>
|
|
|
</div>
|
|
|
<div class="section" id="id5">
|
|
|
<h3>同时观察方法调用前和方法返回后<a class="headerlink" href="#id5" title="永久链接至标题">¶</a></h3>
|
|
|
<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
|
|
|
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>
|
|
|
<ul class="simple">
|
|
|
<li><p>参数里<code class="docutils literal notranslate"><span class="pre">-n</span> <span class="pre">2</span></code>，表示只执行两次</p></li>
|
|
|
<li><p>这里输出结果中，第一次输出的是方法调用前的观察表达式的结果，第二次输出的是方法返回后的表达式的结果</p></li>
|
|
|
<li><p>结果的输出顺序和事件发生的先后顺序一致，和命令中 <code class="docutils literal notranslate"><span class="pre">-s</span> <span class="pre">-b</span></code> 的顺序无关</p></li>
|
|
|
</ul>
|
|
|
</div>
|
|
|
<div class="section" id="x">
|
|
|
<h3>调整<code class="docutils literal notranslate"><span class="pre">-x</span></code>的值，观察具体的方法参数值<a class="headerlink" href="#x" title="永久链接至标题">¶</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><p><code class="docutils literal notranslate"><span class="pre">-x</span></code>表示遍历深度，可以调整来打印具体的参数和结果内容，默认值是1。</p></li>
|
|
|
</ul>
|
|
|
</div>
|
|
|
<div class="section" id="id6">
|
|
|
<h3>条件表达式的例子<a class="headerlink" href="#id6" title="永久链接至标题">¶</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>
|
|
|
<ul class="simple">
|
|
|
<li><p>只有满足条件的调用，才会有响应。</p></li>
|
|
|
</ul>
|
|
|
</div>
|
|
|
<div class="section" id="id7">
|
|
|
<h3>观察异常信息的例子<a class="headerlink" href="#id7" title="永久链接至标题">¶</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><p><code class="docutils literal notranslate"><span class="pre">-e</span></code>表示抛出异常时才触发</p></li>
|
|
|
<li><p>express中，表示异常信息的变量是<code class="docutils literal notranslate"><span class="pre">throwExp</span></code></p></li>
|
|
|
</ul>
|
|
|
</div>
|
|
|
<div class="section" id="id8">
|
|
|
<h3>按照耗时进行过滤<a class="headerlink" href="#id8" title="永久链接至标题">¶</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><p><code class="docutils literal notranslate"><span class="pre">#cost>200</span></code>(单位是<code class="docutils literal notranslate"><span class="pre">ms</span></code>)表示只有当耗时大于200ms时才会输出，过滤掉执行时间小于200ms的调用</p></li>
|
|
|
</ul>
|
|
|
</div>
|
|
|
<div class="section" id="id9">
|
|
|
<h3>观察当前对象中的属性<a class="headerlink" href="#id9" title="永久链接至标题">¶</a></h3>
|
|
|
<p>如果想查看方法运行前后，当前对象中的属性，可以使用<code class="docutils literal notranslate"><span class="pre">target</span></code>关键字，代表当前对象</p>
|
|
|
<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>
|
|
|
<p>然后使用<code class="docutils literal notranslate"><span class="pre">target.field_name</span></code>访问当前对象的某个属性</p>
|
|
|
<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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