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71 lines
2.6 KiB
Markdown
71 lines
2.6 KiB
Markdown
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> 输出当前方法被调用的调用路径
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很多时候我们都知道一个方法被执行，但这个方法被执行的路径非常多，或者你根本就不知道这个方法是从那里被执行了，此时你需要的是 stack 命令。
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### 参数说明
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|参数名称|参数说明|
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|---:|:---|
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|*class-pattern*|类名表达式匹配|
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|*method-pattern*|方法名表达式匹配|
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|*condition-express*|条件表达式|
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|[E]|开启正则表达式匹配，默认为通配符匹配|
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|`[n:]`|执行次数限制|
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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`"{params,returnObj}"`，只要是一个合法的 ognl 表达式，都能被正常支持。
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观察的维度也比较多，主要体现在参数 `advice` 的数据结构上。`Advice` 参数最主要是封装了通知节点的所有信息。
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* 特殊用法请参考：[https://github.com/alibaba/arthas/issues/71](https://github.com/alibaba/arthas/issues/71)
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* OGNL表达式官网：[https://commons.apache.org/proper/commons-ognl/language-guide.html](https://commons.apache.org/proper/commons-ognl/language-guide.html)
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### 使用例子
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#### stack
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`stack demo.MathGame primeFactors`{{execute T2}}
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```bash
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$ stack demo.MathGame primeFactors
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Press Ctrl+C to abort.
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Affect(class-cnt:1 , method-cnt:1) cost in 36 ms.
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ts=2018-12-04 01:32:19;thread_name=main;id=1;is_daemon=false;priority=5;TCCL=sun.misc.Launcher$AppClassLoader@3d4eac69
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@demo.MathGame.run()
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at demo.MathGame.main(MathGame.java:16)
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```
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#### 据条件表达式来过滤
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`stack demo.MathGame primeFactors 'params[0]<0' -n 2`{{execute T2}}
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```bash
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$ stack demo.MathGame primeFactors 'params[0]<0' -n 2
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Press Ctrl+C to abort.
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Affect(class-cnt:1 , method-cnt:1) cost in 30 ms.
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ts=2018-12-04 01:34:27;thread_name=main;id=1;is_daemon=false;priority=5;TCCL=sun.misc.Launcher$AppClassLoader@3d4eac69
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@demo.MathGame.run()
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at demo.MathGame.main(MathGame.java:16)
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ts=2018-12-04 01:34:30;thread_name=main;id=1;is_daemon=false;priority=5;TCCL=sun.misc.Launcher$AppClassLoader@3d4eac69
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@demo.MathGame.run()
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at demo.MathGame.main(MathGame.java:16)
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Command execution times exceed limit: 2, so command will exit. You can set it with -n option.
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```
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#### 据执行时间来过滤
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`stack demo.MathGame primeFactors '#cost>5'`{{execute T2}}
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```bash
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$ stack demo.MathGame primeFactors '#cost>5'
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Press Ctrl+C to abort.
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Affect(class-cnt:1 , method-cnt:1) cost in 35 ms.
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ts=2018-12-04 01:35:58;thread_name=main;id=1;is_daemon=false;priority=5;TCCL=sun.misc.Launcher$AppClassLoader@3d4eac69
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@demo.MathGame.run()
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at demo.MathGame.main(MathGame.java:16)
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```
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