btrace probe field set

gistfile1.txt

import com.sun.btrace.annotations.*;
import com.sun.btrace.AnyType;
import static com.sun.btrace.BTraceUtils.*;

@BTrace
public class Q{
   @OnMethod(
     clazz="java.nio.Buffer",
     method="/.*/",
     location=@Location(value=Kind.FIELD_SET, clazz="java.nio.Buffer", field="po
sition")
   )
   public static void S(@Self Object self, int v){ // type must match the field's type
       if(v == 0){
           //      long id = getLong(field(classForName("com.alibaba.cobar.net.F
rontendConnection",contextClassLoader()),"id"),self);
           int hash = identityHashCode(self);
           println(concat(concat(concat("====", str(hash)) ,"======== set posist
ion : \n"), jstackStr()));
       }
   }

  @OnMethod(
    clazz="com.alibaba.cobar.net.buffer.BufferPool",
    method="insert"
  )
  public static void insert(AnyType[] args){
    println(concat("insert>>>>",str(identityHashCode(args[0]))));
  }

  @OnMethod(
    clazz="com.alibaba.cobar.net.buffer.BufferPool",
    method="extract",
    location=@Location(Kind.RETURN)
  )
  public static void extract(@Return Object arg){
    println(concat("extract>>>>",str(identityHashCode(arg))));
  }
}