btrace使用简介
所属分类 java
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Java运行时追踪工具
BTrace is a safe, dynamic tracing tool for the Java platform.
BTrace can be used to dynamically trace a running Java program
(similar to DTrace for OpenSolaris applications and OS).
BTrace dynamically instruments the classes of the target application to inject tracing code ("bytecode tracing")
https://github.com/btraceio/btrace
可以拦截方法 输入参数和返回值获取 方法执行时间
使用 btrace 1.3.11.3 版本
例子程序
带参数的静态方法
无参数的静态方法
实例方法
import java.util.Date;
import java.util.Random;
public class Hello {
private static final Random rand = new Random();
public static void main(String[] args) throws Exception {
System.out.println("hello");
Hello hello = new Hello();
while (true) {
method1(System.currentTimeMillis());
method2();
hello.method3();
}
}
private static int method1(long time) throws Exception {
int tmp = rand.nextInt(1000);
Thread.sleep(tmp);
System.out.println("method1," + tmp + "," + new Date(time));
return tmp;
}
private static int method2() throws Exception {
int tmp = rand.nextInt(1000);
Thread.sleep(tmp);
System.out.println("method2," + tmp + "," + new Date());
return tmp;
}
private int method3() throws Exception {
int tmp = rand.nextInt(1000);
Thread.sleep(tmp);
System.out.println("method3," + tmp + "," + new Date());
return tmp;
}
}
测试脚本
import com.sun.btrace.BTraceUtils;
import com.sun.btrace.annotations.BTrace;
import com.sun.btrace.annotations.Duration;
import com.sun.btrace.annotations.Kind;
import com.sun.btrace.annotations.Location;
import com.sun.btrace.annotations.OnMethod;
import com.sun.btrace.annotations.ProbeClassName;
import com.sun.btrace.annotations.ProbeMethodName;
import com.sun.btrace.annotations.Return;
@BTrace
public class Script1 {
@OnMethod(clazz = "dyyx.Hello", method = "method1", location = @Location(Kind.RETURN) )
public static void method1(long param1,@ProbeClassName String probeClassName, @ProbeMethodName String probeMethod,
@Duration long duration,@Return int result) {
BTraceUtils.println(probeClassName + "." + probeMethod + ",cost time:" + duration / 1000000 + " ms"+",param1="+param1+",result="+result);
}
@OnMethod(clazz = "dyyx.Hello", method = "method2", location = @Location(Kind.RETURN) )
public static void method2(@ProbeClassName String probeClassName, @ProbeMethodName String probeMethod,
@Duration long duration) {
BTraceUtils.println(probeClassName + "." + probeMethod + ",cost time:" + duration / 1000000 + " ms");
}
@OnMethod(clazz = "dyyx.Hello", method = "method3", location = @Location(Kind.RETURN) )
public static void method3(@ProbeClassName String probeClassName, @ProbeMethodName String probeMethod,
@Duration long duration) {
BTraceUtils.println(probeClassName + "." + probeMethod + ",cost time:" + duration / 1000000 + " ms");
}
}
简单使用
/Users/dugang/soft/btrace/btrace-bin-1.3.11.3/bin
先编译下
./btracec Script1.java
获取需要调试的Java进程id
ps aux|grep Hello
执行脚本
./btrace PID Script1.java -v
需要 加 -v ,否则控制台无输出
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