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3.1.5
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< div class = "section" id = "groovy" >
< h1 > groovy< a class = "headerlink" href = "#groovy" title = "Permalink to this headline" > ¶< / a > < / h1 >
< blockquote >
< div > < p > Arthas support groovy scripting to allow user to use script like BTrace. It is possible to use if/for/switch/while in groovy scripting, but has more limitations compared to BTrace.< / p >
< / div > < / blockquote >
< div class = "section" id = "limitations" >
< h2 > Limitations< a class = "headerlink" href = "#limitations" title = "Permalink to this headline" > ¶< / a > < / h2 >
< ol class = "simple" >
< li > < p > Prohibit from alternating the original logic. Like < code class = "docutils literal notranslate" > < span class = "pre" > watch< / span > < / code > command, The major purpose of scripting is monitoring and observing.< / p > < / li >
< li > < p > Only allow to monitor at the stages of before/success/exception/finish on one method.< / p > < / li >
< / ol >
< / div >
< div class = "section" id = "parameters" >
< h2 > Parameters< a class = "headerlink" href = "#parameters" title = "Permalink to this headline" > ¶< / a > < / h2 >
< table border = "1" class = "docutils" >
< thead >
< tr >
< th align = "right" > Parameter< / th >
< th align = "left" > Explanation< / th >
< / tr >
< / thead >
< tbody >
< tr >
< td align = "right" > < em > class-pattern< / em > < / td >
< td align = "left" > class name pattern< / td >
< / tr >
< tr >
< td align = "right" > < em > method-pattern< / em > < / td >
< td align = "left" > method name pattern< / td >
< / tr >
< tr >
< td align = "right" > < em > script-filepath< / em > < / td >
< td align = "left" > the absolute path of the groovy script< / td >
< / tr >
< tr >
< td align = "right" > [S]< / td >
< td align = "left" > match all sub classes< / td >
< / tr >
< tr >
< td align = "right" > [E]< / td >
< td align = "left" > enable regex match, the default is wildcard match< / td >
< / tr >
< / tbody >
< / table > < p > Note: the third parameter < code class = "docutils literal notranslate" > < span class = "pre" > script-filepath< / span > < / code > must be the absolute path of the groovy script, for example < code class = "docutils literal notranslate" > < span class = "pre" > /tmp/test.groovy< / span > < / code > . It is not recommended to use relative path, e.g. < code class = "docutils literal notranslate" > < span class = "pre" > ./test.groovy< / span > < / code > .< / p >
< / div >
< div class = "section" id = "explanation-on-the-important-callbacks" >
< h2 > Explanation on the important callbacks< a class = "headerlink" href = "#explanation-on-the-important-callbacks" title = "Permalink to this headline" > ¶< / a > < / h2 >
< div class = "highlight-java notranslate" > < div class = "highlight hljs" > < pre class = "java" > /**
* Listeners for script to enhance the class
*/
interface ScriptListener {
/**
* When the script is created
*
* @param output Output
*/
void create(Output output);
/**
* When the script is destroyed
*
* @param output Output
*/
void destroy(Output output);
/**
* Before the method executes
*
* @param output Output
* @param advice Advice
*/
void before(Output output, Advice advice);
/**
* After the method returns
*
* @param output Output
* @param advice Advice
*/
void afterReturning(Output output, Advice advice);
/**
* After the method throws exceptions
*
* @param output Output
* @param advice Advice
*/
void afterThrowing(Output output, Advice advice);
}< / pre > < / div >
< / div >
< / div >
< div class = "section" id = "advice-parameter" >
< h2 > < code class = "docutils literal notranslate" > < span class = "pre" > Advice< / span > < / code > parameter< a class = "headerlink" href = "#advice-parameter" title = "Permalink to this headline" > ¶< / a > < / h2 >
< p > < code class = "docutils literal notranslate" > < span class = "pre" > Advice< / span > < / code > contains all information necessary for notification. Refer to < a class = "reference internal" href = "advice-class.html" > < span class = "doc" > expression core parameters< / span > < / a > for more details.< / p >
< / div >
< div class = "section" id = "output-parameter" >
< h2 > < code class = "docutils literal notranslate" > < span class = "pre" > Output< / span > < / code > parameter< a class = "headerlink" href = "#output-parameter" title = "Permalink to this headline" > ¶< / a > < / h2 >
< p > There are three methods in < code class = "docutils literal notranslate" > < span class = "pre" > Output< / span > < / code > , used for outputting the corresponding text.< / p >
< div class = "highlight-java notranslate" > < div class = "highlight hljs" > < pre class = "java" > /**
* Output
*/
interface Output {
/**
* Output text without line break
*
* @param string Text to output
* @return this
*/
Output print(String string);
/**
* Output text with line break
*
* @param string Text to output
* @return this
*/
Output println(String string);
/**
* Finish outputting from the script
*
* @return this
*/
Output finish();
}< / pre > < / div >
< / div >
< / div >
< div class = "section" id = "a-groovy-sample-script-to-output-logs" >
< h2 > A groovy sample script to output logs< a class = "headerlink" href = "#a-groovy-sample-script-to-output-logs" title = "Permalink to this headline" > ¶< / 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
/**
* Output method logs
*/
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 > Run the script like this:< / p >
< div class = "highlight-bash notranslate" > < div class = "highlight hljs" > < pre class = "bash" > $ 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 > < / div >
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