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< li class = "toctree-l4" > < a class = "reference internal" href = "#check-in-parameters" > Check < tt class = "docutils literal" > in parameters< / tt > < / a > < / li >
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< li > watch< / li >
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< a href = "https://github.com/alibaba/arthas/blob/master/site/src/site/sphinx/en/watch.md" class = "fa fa-github" > Edit on GitHub< / a >
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< div class = "section" id = "watch" >
< span id = "watch" > < / span > < h1 > watch< a class = "headerlink" href = "#watch" title = "Permalink to this headline" > ¶< / a > < / h1 >
< 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 >
< 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" >
< span id = "parameters-options" > < / span > < h2 > Parameters & Options< a class = "headerlink" href = "#parameters-options" title = "Permalink to this headline" > ¶< / a > < / h2 >
< p > There are four different scenarios for < tt class = "docutils literal" > watch< / tt > 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 > any valid OGNL expression as < tt class = "docutils literal" > "{params,returnObj}"< / tt > supported< / li >
< 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 >
< li > at the < em > watching< / em > point, Arthas will use the < em > expression< / em > to evaluate the variables and print them out;< / li >
< 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 >
< 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 >
< / 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" >
< span id = "usage" > < / span > < h2 > Usage< a class = "headerlink" href = "#usage" title = "Permalink to this headline" > ¶< / a > < / h2 >
< div class = "section" id = "start-demo" >
< span id = "start-demo" > < / span > < h3 > Start Demo< a class = "headerlink" href = "#start-demo" title = "Permalink to this headline" > ¶< / a > < / h3 >
< 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 >
< / div >
< div class = "section" id = "check-the-out-parameters-and-return-value" >
< 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 >
< 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 = "check-in-parameters" >
< 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 >
< 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 >
< p > Compared to the previous < em > check< / em > :< / p >
< ul class = "simple" >
< li > < tt class = "docutils literal" > return value< / tt > is < tt class = "docutils literal" > null< / tt > since it’ < tt class = "docutils literal" > -b< / tt > .< / li >
< / ul >
< / div >
< div class = "section" id = "check-before-and-after-at-the-same-time" >
< 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 >
< 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 >
< 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 > < / 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 >
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< 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 >
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< 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]
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