btrace实验
2015-06-15 21:28
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1、在visulVM中安装BTrace.
2、编写测试程序
package www.klshiguang.btrace;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
public class BTraceTest {
public int add(int a,int b){
return a + b;
}
public static void main(String[] args) throws IOException {
BTraceTest test = new BTraceTest();
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
for(int i = 0;i < 10;i++){
reader.readLine();
int a = (int) Math.round(Math.random() * 1000);
int b = (int) Math.round(Math.random() * 1000);
System.out.println(test.add(a, b));
}
}
}
运行程序,等待控制台输入。
3、在visulVM中邮件点击上面的程序名,选择trace application...
4、在BTrace面板输入以下内容:
import com.sun.btrace.annotations.*;
import static com.sun.btrace.BTraceUtils.*;
@BTrace
public class TracingScript {
@OnMethod(
clazz="www.klshiguang.btrace.BTraceTest",
method="add",
location=@Location(Kind.RETURN)
)
public static void func(@Self
www.klshiguang.btrace.BTraceTest instance,int a,
int b,@Return int result){
println("调用堆栈:");
jstack();
println(strcat("方法参数a:",str(a)));
println(strcat("方法参数a:",str(b)));
println(strcat("方法结果:",str(result)));
}
}
5、点击start开始编译
当出现下面内容表示编译成功:
* Starting BTrace task
** Compiling the BTrace script ...
*** Compiled
** Instrumenting 1 classes ...
*** Done
** BTrace up&running
*** Done
** BTrace up&running
6、在BTraceTest程序上回车
7、观察btrace,有下列信息输出,说明动态插入代码成功:
调用堆栈:
www.klshiguang.btrace.BTraceTest.add(BTraceTest.java:10)
www.klshiguang.btrace.BTraceTest.main(BTraceTest.java:21)
方法参数a:324
方法参数a:159
方法结果:483
调用堆栈:
www.klshiguang.btrace.BTraceTest.add(BTraceTest.java:10)
www.klshiguang.btrace.BTraceTest.main(BTraceTest.java:21)
方法参数a:843
方法参数a:411
方法结果:1254
调用堆栈:
www.klshiguang.btrace.BTraceTest.add(BTraceTest.java:10)
www.klshiguang.btrace.BTraceTest.main(BTraceTest.java:21)
方法参数a:227
方法参数a:738
方法结果:965
调用堆栈:
www.klshiguang.btrace.BTraceTest.add(BTraceTest.java:10)
www.klshiguang.btrace.BTraceTest.main(BTraceTest.java:21)
方法参数a:940
方法参数a:656
方法结果:1596
调用堆栈:
www.klshiguang.btrace.BTraceTest.add(BTraceTest.java:10)
www.klshiguang.btrace.BTraceTest.main(BTraceTest.java:21)
方法参数a:416
方法参数a:433
方法结果:849
调用堆栈:
www.klshiguang.btrace.BTraceTest.add(BTraceTest.java:10)
www.klshiguang.btrace.BTraceTest.main(BTraceTest.java:21)
方法参数a:675
方法参数a:873
方法结果:1548
调用堆栈:
www.klshiguang.btrace.BTraceTest.add(BTraceTest.java:10)
www.klshiguang.btrace.BTraceTest.main(BTraceTest.java:21)
方法参数a:861
方法参数a:56
方法结果:917
调用堆栈:
www.klshiguang.btrace.BTraceTest.add(BTraceTest.java:10)
www.klshiguang.btrace.BTraceTest.main(BTraceTest.java:21)
方法参数a:865
方法参数a:527
方法结果:1392
调用堆栈:
www.klshiguang.btrace.BTraceTest.add(BTraceTest.java:10)
www.klshiguang.btrace.BTraceTest.main(BTraceTest.java:21)
方法参数a:581
方法参数a:682
方法结果:1263
调用堆栈:
** BTrace has stopped
** BTrace has stopped
2、编写测试程序
package www.klshiguang.btrace;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
public class BTraceTest {
public int add(int a,int b){
return a + b;
}
public static void main(String[] args) throws IOException {
BTraceTest test = new BTraceTest();
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
for(int i = 0;i < 10;i++){
reader.readLine();
int a = (int) Math.round(Math.random() * 1000);
int b = (int) Math.round(Math.random() * 1000);
System.out.println(test.add(a, b));
}
}
}
运行程序,等待控制台输入。
3、在visulVM中邮件点击上面的程序名,选择trace application...
4、在BTrace面板输入以下内容:
import com.sun.btrace.annotations.*;
import static com.sun.btrace.BTraceUtils.*;
@BTrace
public class TracingScript {
@OnMethod(
clazz="www.klshiguang.btrace.BTraceTest",
method="add",
location=@Location(Kind.RETURN)
)
public static void func(@Self
www.klshiguang.btrace.BTraceTest instance,int a,
int b,@Return int result){
println("调用堆栈:");
jstack();
println(strcat("方法参数a:",str(a)));
println(strcat("方法参数a:",str(b)));
println(strcat("方法结果:",str(result)));
}
}
5、点击start开始编译
当出现下面内容表示编译成功:
* Starting BTrace task
** Compiling the BTrace script ...
*** Compiled
** Instrumenting 1 classes ...
*** Done
** BTrace up&running
*** Done
** BTrace up&running
6、在BTraceTest程序上回车
7、观察btrace,有下列信息输出,说明动态插入代码成功:
调用堆栈:
www.klshiguang.btrace.BTraceTest.add(BTraceTest.java:10)
www.klshiguang.btrace.BTraceTest.main(BTraceTest.java:21)
方法参数a:324
方法参数a:159
方法结果:483
调用堆栈:
www.klshiguang.btrace.BTraceTest.add(BTraceTest.java:10)
www.klshiguang.btrace.BTraceTest.main(BTraceTest.java:21)
方法参数a:843
方法参数a:411
方法结果:1254
调用堆栈:
www.klshiguang.btrace.BTraceTest.add(BTraceTest.java:10)
www.klshiguang.btrace.BTraceTest.main(BTraceTest.java:21)
方法参数a:227
方法参数a:738
方法结果:965
调用堆栈:
www.klshiguang.btrace.BTraceTest.add(BTraceTest.java:10)
www.klshiguang.btrace.BTraceTest.main(BTraceTest.java:21)
方法参数a:940
方法参数a:656
方法结果:1596
调用堆栈:
www.klshiguang.btrace.BTraceTest.add(BTraceTest.java:10)
www.klshiguang.btrace.BTraceTest.main(BTraceTest.java:21)
方法参数a:416
方法参数a:433
方法结果:849
调用堆栈:
www.klshiguang.btrace.BTraceTest.add(BTraceTest.java:10)
www.klshiguang.btrace.BTraceTest.main(BTraceTest.java:21)
方法参数a:675
方法参数a:873
方法结果:1548
调用堆栈:
www.klshiguang.btrace.BTraceTest.add(BTraceTest.java:10)
www.klshiguang.btrace.BTraceTest.main(BTraceTest.java:21)
方法参数a:861
方法参数a:56
方法结果:917
调用堆栈:
www.klshiguang.btrace.BTraceTest.add(BTraceTest.java:10)
www.klshiguang.btrace.BTraceTest.main(BTraceTest.java:21)
方法参数a:865
方法参数a:527
方法结果:1392
调用堆栈:
www.klshiguang.btrace.BTraceTest.add(BTraceTest.java:10)
www.klshiguang.btrace.BTraceTest.main(BTraceTest.java:21)
方法参数a:581
方法参数a:682
方法结果:1263
调用堆栈:
** BTrace has stopped
** BTrace has stopped
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