Btrace使用

介紹

 BTrace 是一個針對Java的安全的，動態的跟蹤工具。它經過動態替換字節碼，添加跟蹤代碼，來完成跟蹤任務。

 1)無侵入(侵入小)

 2)不修改應用任何數據

 3)限制跟蹤功能

下載安裝

1/下載 btrace-bin.zip包，解壓到btrace文件夾（unzip btrace-bin.zip -d btrace）

2/ 運行sh /btrace/bin/btrace

實用例子

DailyTest.java 待監控的測試類

BtraceTestAdd.java、BtraceTestAttribute.java、BtraceTestExecuteTime.java 是Btrace腳本

public class DailyTest {
        private int count;

        public static void main(String[] args) {
                DailyTest test = new DailyTest();
                while (true) {
                        try {
                                System.out.println(test.sayHello("hello.."));
                                Thread.sleep(5000);
                        } catch (InterruptedException e) {
                                e.printStackTrace();
                        }
                }
        }

        public String sayHello(String word) {
                return "dong-" + count++ + "-" + word;
        }
}

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

@BTrace
public class BtraceTestAdd {
   private static int count = 0;
   @OnMethod(
      clazz="DailyTest",
      method="sayHello",
      location=@Location(Kind.RETURN)
   )
   public static void traceExecute(String param,@Return String result){
        println(param);
        println(result);
   }
}

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

@BTrace
public class BtraceTestAttribute {
   private static Object count = 0;
   @OnMethod(
      clazz="DailyTest",
      method="sayHello",
      location=@Location(Kind.RETURN)
   )
   public static void traceExecute(@Self DailyTest dailyTest){
        count = get(field("DailyTest","count"),dailyTest);
        println(count);
   }
   @OnTimer(1000)
   public static void print(){
        println(strcat("count:",str(count)));
   }
}

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

@BTrace
public class BtraceTestExecuteTime {
   @TLS private static long startTime = 0;
   @OnMethod(
      clazz="DailyTest",
      method="sayHello"
   )
   public static void startExecute(){
        startTime = timeNanos();
   }

   @OnMethod(
      clazz="DailyTest",
      method="sayHello",
      location=@Location(Kind.RETURN)
   )
   public static void endExecute(@Duration long duration){
      long time = timeNanos()-startTime;
      println(strcat("execute time:",str(time)));
      println(strcat("duration:",str(duration)));
   }
}