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3.1.7
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< h1 > groovy< a class = "headerlink" href = "#groovy" title = "永久链接至标题" > ¶< / a > < / h1 >
< blockquote >
< div > < p > Arthas 支持 groovy 脚本增强，允许像 BTrace 一样编写脚本来解决问题，可以在 groovy 脚本中进行if/for/switch/while 等控制语句，不受限制，但相比 BTrace 而言拥有更多的限制范围。< / p >
< / div > < / blockquote >
< div class = "section" id = "id1" >
< h2 > 限制内容< a class = "headerlink" href = "#id1" title = "永久链接至标题" > ¶< / a > < / h2 >
< ol class = "simple" >
< li > < p > 禁止改变原有逻辑，与 watch 等命令一样，重点保证的是监听和观察。< / p > < / li >
< li > < p > 只允许在方法的 before/success/exception/finish 四个环节进行监听。< / p > < / li >
< / ol >
< / div >
< div class = "section" id = "id2" >
< h2 > 参数说明< a class = "headerlink" href = "#id2" title = "永久链接至标题" > ¶< / a > < / h2 >
< 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 > script-filepath< / em > < / td >
< td align = "left" > groovy 脚本的绝对路径< / td >
< / tr >
< tr >
< td align = "right" > [S]< / td >
< td align = "left" > 匹配所有的子类< / 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 >
< / tbody >
< / table > < p > 需要说明的是，第三个输入参数是脚本的绝对路径，比如 < code class = "docutils literal notranslate" > < span class = "pre" > /tmp/test.groovy< / span > < / code > ，不建议输入相对路径，比如 < code class = "docutils literal notranslate" > < span class = "pre" > ./test.groovy< / span > < / code > < / p >
< / div >
< div class = "section" id = "id3" >
< h2 > 五个关键函数声明< a class = "headerlink" href = "#id3" title = "永久链接至标题" > ¶< / a > < / h2 >
< div class = "highlight-java notranslate" > < div class = "highlight hljs" > < pre class = "java" > /**
* 增强脚本监听器
*/
interface ScriptListener {
/**
* 脚本创建
*
* @param output 输出器
*/
void create(Output output);
/**
* 脚本销毁
*
* @param output 输出器
*/
void destroy(Output output);
/**
* 方法执行前
*
* @param output 输出器
* @param advice 通知点
*/
void before(Output output, Advice advice);
/**
* 方法正常返回
*
* @param output 输出器
* @param advice 通知点
*/
void afterReturning(Output output, Advice advice);
/**
* 方法异常返回
*
* @param output 输出器
* @param advice 通知点
*/
void afterThrowing(Output output, Advice advice);
}< / pre > < / div >
< / div >
< / div >
< div class = "section" id = "advice" >
< h2 > 参数 < code class = "docutils literal notranslate" > < span class = "pre" > Advice< / span > < / code > 说明< a class = "headerlink" href = "#advice" title = "永久链接至标题" > ¶< / a > < / h2 >
< p > < 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。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 >
< / div >
< div class = "section" id = "output" >
< h2 > 参数 < code class = "docutils literal notranslate" > < span class = "pre" > Output< / span > < / code > 说明< a class = "headerlink" href = "#output" title = "永久链接至标题" > ¶< / a > < / h2 >
< p > < code class = "docutils literal notranslate" > < span class = "pre" > Output< / span > < / code > 参数只拥有三个方法，主要的工作还是输出对应的文本信息< / p >
< div class = "highlight-java notranslate" > < div class = "highlight hljs" > < pre class = "java" > /**
* 输出器
*/
interface Output {
/**
* 输出字符串(不换行)
*
* @param string 待输出字符串
* @return this
*/
Output print(String string);
/**
* 输出字符串(换行)
*
* @param string 待输出字符串
* @return this
*/
Output println(String string);
/**
* 结束当前脚本
*
* @return this
*/
Output finish();
}< / pre > < / div >
< / div >
< / div >
< div class = "section" id = "id4" >
< h2 > 一个输出日志的 groovy 脚本示例< a class = "headerlink" href = "#id4" title = "永久链接至标题" > ¶< / a > < / h2 >
< div class = "highlight-groovy notranslate" > < div class = "highlight hljs" > < pre class = "groovy" > import com.taobao.arthas.core.command.ScriptSupportCommand
import com.taobao.arthas.core.util.Advice
import static java.lang.String.format
/**
* 输出方法日志
*/
public class Logger implements ScriptSupportCommand.ScriptListener {
@Override
void create(ScriptSupportCommand.Output output) {
output.println(" script create." );
}
@Override
void destroy(ScriptSupportCommand.Output output) {
output.println(" script destroy." );
}
@Override
void before(ScriptSupportCommand.Output output, Advice advice) {
output.println(format(" before:class=%s;method=%s;paramslen=%d;%s;" ,
advice.getClazz().getSimpleName(),
advice.getMethod().getName(),
advice.getParams().length, advice.getParams()))
}
@Override
void afterReturning(ScriptSupportCommand.Output output, Advice advice) {
output.println(format(" returning:class=%s;method=%s;" ,
advice.getClazz().getSimpleName(),
advice.getMethod().getName()))
}
@Override
void afterThrowing(ScriptSupportCommand.Output output, Advice advice) {
output.println(format(" throwing:class=%s;method=%s;" ,
advice.getClazz().getSimpleName(),
advice.getMethod().getName()))
}
}< / pre > < / div >
< / div >
< p > 使用示例：< / p >
< div class = "highlight-default notranslate" > < pre class = "literal-block" > $ groovy com.alibaba.sample.petstore.dal.dao.ProductDao getProductById /Users/zhuyong/middleware/arthas/scripts/Logger.groovy -S
script create.
Press Ctrl+C to abort.
Affect(class-cnt:1 , method-cnt:1) cost in 102 ms.
before:class=IbatisProductDao;method=getProductById;paramslen=1;[Ljava.lang.Object;@45df64fc;
returning:class=IbatisProductDao;method=getProductById;
before:class=IbatisProductDao;method=getProductById;paramslen=1;[Ljava.lang.Object;@5b0e2d00;
returning:class=IbatisProductDao;method=getProductById;< / pre >
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