BTrace sample

Case.java

import java.util.Random;
public class Case1{
 
   public static void main(String[] args) throws Exception{
      Random random=new Random();
      CaseObject object=new CaseObject();
      boolean result=true;
      while(result){
         result=object.execute(random.nextInt(1000));
         Thread.sleep(1000);
      }
   }
 
}

public class CaseObject{
 
   private static int sleepTotalTime=0; 
 
   public boolean execute(int sleepTime) throws Exception{
       System.out.println("sleep: "+sleepTime);
       sleepTotalTime+=sleepTime;
       Thread.sleep(sleepTime);
       return true;
   }
 
}

gistfile1.txt

btrace -cp build\;. pid TraceMethodArgsAndReturn.java

1、调用此方法时传入的是什么参数，返回的是什么值，当时sleepTotalTime是多少？
2、execute方法执行耗时是多久？
3、谁调用了execute方法？
4、有没有人调用CaseObject中的哪一行代码？


http://kenai.com/projects/btrace/pages/UserGuide

TraceMethodArgsAndReturn.java

import static com.sun.btrace.BTraceUtils.*;
import com.sun.btrace.annotations.*;
 
@BTrace public class TraceMethodArgsAndReturn{
   @OnMethod(
      clazz="CaseObject",
      method="execute",
      location=@Location(Kind.RETURN)
   )
   public static void traceExecute(@Self CaseObject instance,int sleepTime,@Return boolean result){
     println("call CaseObject.execute");
     println(strcat("sleepTime is:",str(sleepTime)));
     println(strcat("sleepTotalTime is:",str(get(field("CaseObject","sleepTotalTime"),instance))));
     println(strcat("return value is:",str(result)));
   }
}

TraceMethodCallee.java

import static com.sun.btrace.BTraceUtils.*;
import com.sun.btrace.annotations.*;
 
@BTrace public class TraceMethodCallee{
   @OnMethod(
      clazz="CaseObject",
      method="execute"
   )
   public static void traceExecute(){
     println("who call CaseObject.execute :");
     jstack();
   }
}

TraceMethodExecuteTime.java

import static com.sun.btrace.BTraceUtils.*;
import com.sun.btrace.annotations.*;
 
@BTrace public class TraceMethodExecuteTime{
 
   @TLS static long beginTime;
 
   @OnMethod(
      clazz="CaseObject",
      method="execute"
   )
   public static void traceExecuteBegin(){
     beginTime=timeMillis();
   }
 
   @OnMethod(
      clazz="CaseObject",
      method="execute",
      location=@Location(Kind.RETURN)
   )
   public static void traceExecute(int sleepTime,@Return boolean result){
      println(strcat(strcat("CaseObject.execute time is:",str(timeMillis()-beginTime)),"ms"));
   }
}

TraceMethodLine.java

import static com.sun.btrace.BTraceUtils.*;
import com.sun.btrace.annotations.*;
 
@BTrace public class TraceMethodLine{
   @OnMethod(
      clazz="CaseObject",
      location=@Location(value=Kind.LINE,line=5)
   )
   public static void traceExecute(@ProbeClassName String pcn,@ProbeMethodName String pmn,int line){
     println(strcat(strcat(strcat("call ",pcn),"."),pmn));
   }
}