btrace使用

btrace是很好跟踪线上环境出现异常且棘手的问题，但是在配置环境变量之后，按照前辈们所说不需要编译，

直接btrace  jps  脚本文件就可以，但是我下载current版本之后，但是我在执行过程中，却并未打印出来（有时候可以）

但是我采用编译后的class，是可以的，这个都无妨。那就简单展示效果吧！package com.tonghuashun.btrace.course01.chenyang;

public class KPIApp {

	/**
	 * @param args
	 */
	public static void main(String[] args) throws Exception {
		int i = 1;
		while (true) {
			Thread.sleep(2000);
			CalcKPI kpi = new CalcKPI();
			i++;
			kpi.calc(i + "%");
		}

	}

}

 package com.tonghuashun.btrace.course01.chenyang;

public class CalcKPI {
	public String calc(String kpi) throws Exception {
		System.out.println("KPI :" + kpi);
		return "KPI :" + kpi;
	}
}

 package com.tonghuashun.btrace.course01.chenyang;

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

/**
 * This script demonstrates the possibility to intercept method calls that are
 * about to be executed from the body of a certain method. This is achieved by
 * using the {@linkplain Kind#CALL} location value.
 */
// 在CalcKPI累中调用任何的方法体内，所执行的方法
@BTrace
public class AllCalls1 {
	@OnMethod(clazz = "com.tonghuashun.btrace.course01.chenyang.CalcKPI", method = "/.*/", location = @Location(value = Kind.CALL, clazz = "/.*/", method = "/.*/"))
	public static void m(@Self Object self, @TargetMethodOrField String method,
			@ProbeMethodName String probeMethod) { // all calls to the methods
													// with signature "()"
		println(Strings.strcat(method, Strings.strcat(" in ", probeMethod)));
	}
}package com.tonghuashun.btrace.course01;

import static com.sun.btrace.BTraceUtils.println;
import static com.sun.btrace.BTraceUtils.str;
import static com.sun.btrace.BTraceUtils.strcat;

import com.sun.btrace.annotations.BTrace;
import com.sun.btrace.annotations.Kind;
import com.sun.btrace.annotations.Location;
import com.sun.btrace.annotations.OnMethod;
import com.sun.btrace.annotations.OnTimer;
import com.sun.btrace.annotations.ProbeClassName;
import com.sun.btrace.annotations.Return;
import com.sun.btrace.annotations.Self;

@BTrace
public class TraceMethodArgsAndReturn {

	@OnMethod(

	clazz = "com.tonghuashun.btrace.course01.CaseObject",

	method = "execute",

	location = @Location(Kind.RETURN)

	)
	public static void traceExecute(@Self CaseObject instance, int sleepTime,
			@Return String result, @ProbeClassName String className) {

		println("call CaseObject.execute");

		println(strcat("sleepTime is:", str(sleepTime)));

		println(strcat("return value is:", str(result)));
		println(strcat("CLASSNAME  is:", str(className)));
		// BTraceUtils.print("return value is:" + result);
		//
		// println(strcat("sleepTotalTime is:",
		// str(get(field("CaseObject", "sleepTotalTime"), instance))));
		//
		// println(strcat("return value is:", str(result)));

	}

	@OnTimer(value = 4000)
	public static void print() {

	}

}