下载地址:https://kenai.com/projects/btrace/downloads/directory/releases/
选择版本进行下载,这里下载的是release-1.2.4 /btrace-bin.zip
这两天在调试程序时,发现一个比较好用的工具-btrace,能够线上监控程序状态,获取运行时数据信息,如方法返回值,参数,调用次数,全局变量,调用堆栈等。
位于bin目录下面主要有6个脚本,3个windows的,另外3个是linux的,分别是btrace、btracec、btracer。具体功能如下:
功能: 用于运行BTrace跟踪程序。
命令格式:
btrace [-I <include-path>] [-p <port>] [-cp <classpath>] <pid> <btrace-script> [<args>]
示例:
btrace -cp build/ 1200 AllCalls1.java
参数含义:
include-path指定头文件的路径,用于脚本预处理功能,可选;
port指定BTrace agent的服务端监听端口号,用来监听clients,默认为2020,可选;
classpath用来指定类加载路径,默认为当前路径,可选;
pid表示进程号,可通过jps命令获取;
btrace-script即为BTrace脚本;btrace脚本如果以.java结尾,会先编译再提交执行。可使用btracec命令对脚本进行预编译。
args是BTrace脚本可选参数,在脚本中可通过"$"和"$length"获取参数信息。
功能: 用于预编译BTrace脚本,用于在编译时期验证脚本正确性。
btracec [-I <include-path>] [-cp <classpath>] [-d <directory>] <one-or-more-BTrace-.java-files>
参数意义同btrace命令一致,directory表示编译结果输出目录。
功能: btracer命令同时启动应用程序和BTrace脚本,即在应用程序启动过程中使用BTrace脚本。而btrace命令针对已运行程序执行BTrace脚本。
命令格式:
btracer <pre-compiled-btrace.class> <application-main-class> <application-args>
参数说明:
pre-compiled-btrace.class表示经过btracec编译后的BTrace脚本。
application-main-class表示应用程序代码;
application-args表示应用程序参数。
该命令的等价写法为:
java -javaagent:btrace-agent.jar=script=<pre-compiled-btrace-script1>[,<pre-compiled-btrace-script1>]* <MainClass> <AppArguments>
In particular, a BTrace class
public static
methods of com.sun.btrace.BTraceUtils
class may be called from a BTrace program. static public void
returning methods are allowed for a BTrace class. And all fields have to be static. for, while, do..while
)
BTrace提供了jvisualvm插件,强烈推荐在jvisualvm中编写和测试BTrace脚本,启动、关闭、发送事件、增加classpath都非常方便。
package baby.btrace; public class CaseObject{ private static int sleepTotalTime=0; private int sleepTotalTime2=0; public boolean execute(int sleepTime) throws Exception{ System.out.println("sleep: "+sleepTime); sleepTotalTime+=sleepTime; sleepTotalTime2=sleepTotalTime+1; sleep(sleepTime); if(sleepTime%2==0) return true; else return false; } public void sleep(int sleepTime) throws Exception { Thread.sleep(sleepTime); } }
package baby.btrace; import java.util.Random; public class CaseObjectMain { int times = 10; public static void main(String[] args) { CaseObjectMain main= new CaseObjectMain(); try { main.begin(); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } public void begin() throws Exception{ CaseObject object=new CaseObject(); while(true){ times++; boolean result=doWork(object); Thread.sleep(1000); } } public boolean doWork(CaseObject object) throws Exception{ Random random=new Random(); boolean temp= object.execute(random.nextInt(1000)); return temp; } }
/* BTrace Script Template */ import com.sun.btrace.annotations.*; import static com.sun.btrace.BTraceUtils.*; @BTrace public class TracingScript { /* put your code here */ /*指明要查看的方法,类*/ @OnMethod( clazz="baby.btrace.CaseObject", method="execute", location=@Location(Kind.RETURN) ) /*主要两个参数是对象自己的引用 和 返回值,其它参数都是方法调用时传入的参数*/ public static void traceExecute(@Self baby.btrace.CaseObject object,int sleepTime, @Return boolean result){ println("调用堆栈!!"); println(strcat("返回结果是:",str(result))); jstack(); println(strcat("时间是:",str(sleepTime))); } }
/* BTrace Script Template */ import com.sun.btrace.annotations.*; import static com.sun.btrace.BTraceUtils.*; @BTrace public class TracingScript { /* put your code here */ /*指明要查看的方法,类*/ @OnMethod( clazz="baby.btrace.CaseObject", method="execute", location=@Location(Kind.RETURN) ) /*主要两个参数是对象自己的引用 和 返回值,其它参数都是方法调用时传入的参数*/ public static void traceExecute(@Self baby.btrace.CaseObject object,int sleepTime, @Return boolean result){ println("调用堆栈!!"); println(strcat("返回结果是:",str(result))); jstack(); println(strcat("时间是:",str(sleepTime))); } }
import com.sun.btrace.annotations.*; import static com.sun.btrace.BTraceUtils.*; @BTrace public class TracingScript3 { @TLS private static long startTime = 0; @OnMethod( clazz="baby.btrace.CaseObject", method="execute" ) public static void startExecute(){ startTime = timeNanos(); } @OnMethod( clazz="baby.btrace.CaseObject", method="execute", location=@Location(Kind.RETURN) ) public static void endExecute(@Duration long duration){ long time = timeNanos() - startTime; println(strcat("execute time(nanos): ", str(time))); println(strcat("duration(nanos): ", str(duration))); } }
import com.sun.btrace.annotations.*; import static com.sun.btrace.BTraceUtils.*; @BTrace public class TracingScript4 { private static long count; @OnMethod( clazz="/.*/", method="execute", location=@Location(value=Kind.CALL, clazz="/.*/", method="sleep") ) public static void traceExecute(@ProbeClassName String pcm, @ProbeMethodName String pmn, @TargetInstance Object instance, @TargetMethodOrField String method){ println("====== "); println(strcat("ProbeClassName: ",pcm)); println(strcat("ProbeMethodName: ",pmn)); println(strcat("TargetInstance: ",str(classOf(instance)))); println(strcat("TargetMethodOrField : ",str(method))); count++; } @OnEvent public static void getCount(){ println(strcat("count: ", str(count))); } }
import com.sun.btrace.annotations.*; import static com.sun.btrace.BTraceUtils.*; @BTrace public class TracingScript5 { private static long count; @OnMethod( clazz="/.*/", method="execute", location=@Location(value=Kind.CALL, clazz="/.*/", method="sleep") ) public static void traceExecute(@ProbeClassName String pcm, @ProbeMethodName String pmn, @TargetInstance Object instance, @TargetMethodOrField String method){ println("====== "); println(strcat("ProbeClassName: ",pcm)); println(strcat("ProbeMethodName: ",pmn)); println(strcat("TargetInstance: ",str(classOf(instance)))); println(strcat("TargetMethodOrField : ",str(method))); count++; } @OnEvent public static void getCount(){ println(strcat("count: ", str(count))); } @OnEvent("A") public static void getCountA(){ println("==AAAA==== "); println(strcat("count: ", str(count))); } @OnEvent("B") public static void getCountB(){ println("==BBB==== "); println(strcat("count: ", str(count))); } }
链接:
http://agapple.iteye.com/blog/1005918
http://agapple.iteye.com/blog/962119