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< span id = "watch" > < / span > < h1 > watch< a class = "headerlink" href = "#watch" title = "永久链接至标题" > ¶< / a > < / h1 >
< blockquote >
< div > 方法执行数据观测< / div > < / blockquote >
< 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：< tt class = "docutils literal" > 返回值< / tt > 、< tt class = "docutils literal" > 抛出异常< / tt > 、< tt class = "docutils literal" > 入参< / tt > ，通过编写 < / p >
< div class = "section" id = "" >
< span id = "id1" > < / span > < h2 > 参数说明< a class = "headerlink" href = "#" title = "永久链接至标题" > ¶< / a > < / h2 >
< 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 >
< table border = "1" class = "docutils" >
< thead >
< tr >
< th align = "right" > 参数名称< / th >
< th align = "left" > 参数说明< / th >
< / tr >
< / thead >
< tbody >
< tr >
< td align = "right" > < em > class-pattern< / em > < / td >
< td align = "left" > 类名表达式匹配< / td >
< / tr >
< tr >
< td align = "right" > < em > method-pattern< / em > < / td >
< td align = "left" > 方法名表达式匹配< / td >
< / tr >
< tr >
< td align = "right" > < em > express< / em > < / td >
< td align = "left" > 观察表达式< / td >
< / tr >
< tr >
< td align = "right" > < em > condition-express< / em > < / td >
< td align = "left" > 条件表达式< / td >
< / tr >
< tr >
< td align = "right" > [b]< / td >
< td align = "left" > 在< strong > 方法调用之前< / strong > 观察< / td >
< / tr >
< tr >
< td align = "right" > [e]< / td >
< td align = "left" > 在< strong > 方法异常之后< / strong > 观察< / td >
< / tr >
< tr >
< td align = "right" > [s]< / td >
< td align = "left" > 在< strong > 方法返回之后< / strong > 观察< / td >
< / tr >
< tr >
< td align = "right" > [f]< / td >
< td align = "left" > 在< strong > 方法结束之后< / strong > (正常返回和异常返回)观察< / td >
< / tr >
< tr >
< td align = "right" > [E]< / td >
< td align = "left" > 开启正则表达式匹配，默认为通配符匹配< / td >
< / tr >
< tr >
< td align = "right" > [x:]< / td >
< td align = "left" > 指定输出结果的属性遍历深度，默认为 1< / td >
< / tr >
< / tbody >
< / 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 < tt class = "docutils literal" > "{params,returnObj}"< / tt > ，只要是一个合法的 ognl 表达式，都能被正常支持。< / p >
< p > 观察的维度也比较多，主要体现在参数 < tt class = "docutils literal" > advice< / tt > 的数据结构上。< tt class = "docutils literal" > Advice< / tt > 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 >
< ul class = "simple" >
< li > 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 > < / li >
< li > 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 > < / li >
< / ul >
< p > < strong > 特别说明< / strong > ： < / p >
< ul class = "simple" >
< li > watch 命令定义了4个观察事件点， < tt class = "docutils literal" > -b< / tt > 方法调用前，< tt class = "docutils literal" > -e< / tt > 方法异常后，< tt class = "docutils literal" > -s< / tt > 方法返回后，< tt class = "docutils literal" > -f< / tt > 方法结束后< / li >
< li > 4个观察事件点 < tt class = "docutils literal" > -b< / tt > 、< tt class = "docutils literal" > -e< / tt > 、< tt class = "docutils literal" > -s< / tt > 默认关闭，< tt class = "docutils literal" > -f< / tt > 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< / li >
< li > 这里要注意< tt class = "docutils literal" > 方法入参< / tt > 和< tt class = "docutils literal" > 方法出参< / tt > 的区别，有可能在中间被修改导致前后不一致，除了 < tt class = "docutils literal" > -b< / tt > 事件点 < tt class = "docutils literal" > params< / tt > 代表方法入参外，其余事件都代表方法出参< / li >
< li > 当使用 < tt class = "docutils literal" > -b< / tt > 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< / li >
< / ul >
< / div >
< div class = "section" id = "" >
< span id = "id2" > < / span > < h2 > 使用参考< a class = "headerlink" href = "#" title = "永久链接至标题" > ¶< / a > < / h2 >
< div class = "section" id = "demo" >
< span id = "demo" > < / span > < h3 > 启动 Demo< a class = "headerlink" href = "#demo" title = "永久链接至标题" > ¶< / a > < / h3 >
< p > 启动< a class = "reference internal" href = "quick-start.html" > < span class = "doc" > 快速入门< / span > < / a > 里的< tt class = "docutils literal" > arthas-demo< / tt > 。< / p >
< / div >
< div class = "section" id = "" >
< span id = "id3" > < / span > < h3 > 观察方法出参和返回值< a class = "headerlink" href = "#" 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 = "" >
< span id = "id4" > < / span > < h3 > 观察方法入参< a class = "headerlink" href = "#" 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 > 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）< / li >
< / ul >
< / div >
< div class = "section" id = "" >
< span id = "id5" > < / span > < h3 > 同时观察方法调用前和方法返回后< a class = "headerlink" href = "#" 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 > 参数里< tt class = "docutils literal" > -n 2< / tt > ，表示只执行两次< / li >
< li > 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< / li >
< li > 结果的输出顺序和事件发生的先后顺序一致，和命令中 < tt class = "docutils literal" > -s -b< / tt > 的顺序无关< / li >
< / ul >
< / div >
< div class = "section" id = "x" >
< span id = "x" > < / span > < h3 > 调整< tt class = "docutils literal" > -x< / tt > 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 > < tt class = "docutils literal" > -x< / tt > 表示遍历深度， ， < / li >
< / ul >
< / div >
< div class = "section" id = "" >
< span id = "id6" > < / span > < h3 > 条件表达式的例子< a class = "headerlink" href = "#" 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 > 只有满足条件的调用，才会有响应。< / li >
< / ul >
< / div >
< div class = "section" id = "" >
< span id = "id7" > < / span > < h3 > 观察异常信息的例子< a class = "headerlink" href = "#" 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 > < tt class = "docutils literal" > -e< / tt > < / li >
< li > express中， < tt class = "docutils literal" > throwExp< / tt > < / li >
< / ul >
< / div >
< div class = "section" id = "" >
< span id = "id8" > < / span > < h3 > 按照耗时进行过滤< a class = "headerlink" href = "#" 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 > < tt class = "docutils literal" > #cost>200< / tt > (单位是< tt class = "docutils literal" > ms< / tt > )表示只有当耗时大于200ms时才会输出， < / li >
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< span id = "id9" > < / span > < h3 > 观察当前对象中的属性< a class = "headerlink" href = "#" 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< tt class = "docutils literal" > target< / tt > 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< tt class = "docutils literal" > target.field_name< / tt > 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]
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