环境准备
- IntelliJ IDEA Community Edition
- jdk1.8.0_45 64位
配置信息（路径相关修改为自己的）
- 配置位置：Run/Debug Configurations -> VM options
- 配置内容：-javaagent:E:\itstack\GIT\itstack.org\itstack-demo-agent\itstack-demo-agent-06\target\itstack-demo-agent-06-1.0.0-SNAPSHOT.jar=testargs
代码示例
itstack-demo-agent-06
├── pom.xml
└── src
├── main
│ ├── java
│ │ └── org.itstack.demo.agent
│ │ ├── plugin
│ │ │ ├── impl
│ │ │ │ ├── jvm
│ │ │ │ │ ├── JvmAdvice.java
│ │ │ │ │ ├── JvmPlugin.java
│ │ │ │ │ └── JvmStack.java
│ │ │ │ └── link
│ │ │ │ ├── LinkAdvice.java
│ │ │ │ └── LinkPlugin.java
│ │ │ ├── InterceptPoint.java
│ │ │ ├── IPlugin.java
│ │ │ └── PluginFactory.java
│ │ │
│ │ ├── track
│ │ │ ├── Span.java
│ │ │ ├── TrackContext.java
│ │ │ └── TrackManager.java
│ │ └── MyAgent.java
│ └── resources
│ └── META-INF
│ └── MANIFEST.MF
└── test
└── java
└── org.itstack.demo.test
└── ApiTest.java
JvmAdvice.java
public class JvmAdvice {
@Advice.OnMethodExit()
public static void exit() {
JvmStack.printMemoryInfo();
JvmStack.printGCInfo();
}
}
JvmPlugin.java
public class JvmPlugin implements IPlugin {
@Override
public String name() {
return "jvm";
}
@Override
public InterceptPoint[] buildInterceptPoint() {
return new InterceptPoint[]{
new InterceptPoint() {
@Override
public ElementMatcher<TypeDescription> buildTypesMatcher() {
return ElementMatchers.nameStartsWith("org.itstack.demo.test");
}
@Override
public ElementMatcher<MethodDescription> buildMethodsMatcher() {
return ElementMatchers.isMethod()
.and(ElementMatchers.any())
.and(ElementMatchers.not(ElementMatchers.nameStartsWith("main")));
}
}
};
}
@Override
public Class adviceClass() {
return JvmAdvice.class;
}
}
LinkAdvice.java
public class LinkAdvice {
@Advice.OnMethodEnter()
public static void enter(@Advice.Origin("#t") String className, @Advice.Origin("#m") String methodName) {
Span currentSpan = TrackManager.getCurrentSpan();
if (null == currentSpan) {
String linkId = UUID.randomUUID().toString();
TrackContext.setLinkId(linkId);
}
TrackManager.createEntrySpan();
}
@Advice.OnMethodExit()
public static void exit(@Advice.Origin("#t") String className, @Advice.Origin("#m") String methodName) {
Span exitSpan = TrackManager.getExitSpan();
if (null == exitSpan) return;
System.out.println("链路追踪(MQ)：" + exitSpan.getLinkId() + " " + className + "." + methodName + " 耗时：" + (System.currentTimeMillis() - exitSpan.getEnterTime().getTime()) + "ms");
}
}
LinkPlugin.java
public class LinkPlugin implements IPlugin {
@Override
public String name() {
return "link";
}
@Override
public InterceptPoint[] buildInterceptPoint() {
return new InterceptPoint[]{
new InterceptPoint() {
@Override
public ElementMatcher<TypeDescription> buildTypesMatcher() {
return ElementMatchers.nameStartsWith("org.itstack.demo.test");
}
@Override
public ElementMatcher<MethodDescription> buildMethodsMatcher() {
return ElementMatchers.isMethod()
.and(ElementMatchers.any())
.and(ElementMatchers.not(ElementMatchers.nameStartsWith("main")));
}
}
};
}
@Override
public Class adviceClass() {
return LinkAdvice.class;
}
}
InterceptPoint.java
public interface InterceptPoint {
//类匹配规则
ElementMatcher<TypeDescription> buildTypesMatcher();
//方法匹配规则
ElementMatcher<MethodDescription> buildMethodsMatcher();
}
IPlugin.java
public interface IPlugin {
//名称
String name();
//监控点
InterceptPoint[] buildInterceptPoint();
//拦截器类
Class adviceClass();
}
PluginFactory.java
public class PluginFactory {
public static List<IPlugin> pluginGroup = new ArrayList<>();
static {
//链路监控
pluginGroup.add(new LinkPlugin());
//Jvm监控
pluginGroup.add(new JvmPlugin());
}
}
TrackManager.java
public class TrackManager {
private static final ThreadLocal<Stack<Span>> track = new ThreadLocal<>();
private static Span createSpan() {
Stack<Span> stack = track.get();
if (stack == null) {
stack = new Stack<>();
track.set(stack);
}
String linkId;
if (stack.isEmpty()) {
linkId = TrackContext.getLinkId();
if (linkId == null) {
linkId = "nvl";
TrackContext.setLinkId(linkId);
}
} else {
Span span = stack.peek();
linkId = span.getLinkId();
TrackContext.setLinkId(linkId);
}
return new Span(linkId);
}
public static Span createEntrySpan() {
Span span = createSpan();
Stack<Span> stack = track.get();
stack.push(span);
return span;
}
public static Span getExitSpan() {
Stack<Span> stack = track.get();
if (stack == null || stack.isEmpty()) {
TrackContext.clear();
return null;
}
return stack.pop();
}
public static Span getCurrentSpan() {
Stack<Span> stack = track.get();
if (stack == null || stack.isEmpty()) {
return null;
}
return stack.peek();
}
}
MyAgent.java
public class MyAgent {
//JVM 首先尝试在代理类上调用以下方法
public static void premain(String agentArgs, Instrumentation inst) {
System.out.println("基于javaagent链路追踪｛源码微信公众号：bugstack虫洞栈｝");
System.out.println("==========================================================\r\n");
AgentBuilder agentBuilder = new AgentBuilder.Default();
List<IPlugin> pluginGroup = PluginFactory.pluginGroup;
for (IPlugin plugin : pluginGroup) {
InterceptPoint[] interceptPoints = plugin.buildInterceptPoint();
for (InterceptPoint point : interceptPoints) {
AgentBuilder.Transformer transformer = (builder, typeDescription, classLoader, javaModule) -> {
builder = builder.visit(Advice.to(plugin.adviceClass()).on(point.buildMethodsMatcher()));
return builder;
};
agentBuilder = agentBuilder.type(point.buildTypesMatcher()).transform(transformer).asDecorator();
}
}
//监听
AgentBuilder.Listener listener = new AgentBuilder.Listener() {
@Override
public void onDiscovery(String s, ClassLoader classLoader, JavaModule javaModule, boolean b) {
}
@Override
public void onTransformation(TypeDescription typeDescription, ClassLoader classLoader, JavaModule javaModule, boolean b, DynamicType dynamicType) {
System.out.println("onTransformation：" + typeDescription);
}
@Override
public void onIgnored(TypeDescription typeDescription, ClassLoader classLoader, JavaModule javaModule, boolean b) {
}
@Override
public void onError(String s, ClassLoader classLoader, JavaModule javaModule, boolean b, Throwable throwable) {
}
@Override
public void onComplete(String s, ClassLoader classLoader, JavaModule javaModule, boolean b) {
}
};
agentBuilder.with(listener).installOn(inst);
}
}
MANIFEST.MF
Manifest-Version: 1.0
Premain-Class: org.itstack.demo.agent.MyAgent
Can-Redefine-Classes: true
ApiTest.java
**
* 链路追踪
* VM options：
* -javaagent:E:\itstack\GIT\itstack.org\itstack-demo-agent\itstack-demo-agent-06\target\itstack-demo-agent-06-1.0.0-SNAPSHOT.jar=testargs
*
* 按需打开需要测试的模块
* 链路监控
* pluginGroup.add(new LinkPlugin());
* Jvm监控
* pluginGroup.add(new JvmPlugin());
*
* 博客：http://itstack.org
* 论坛：http://bugstack.cn
* 公众号：bugstack虫洞栈 ｛获取学习源码｝
* create by fuzhengwei on 2019
*
*/
public class ApiTest {
public static void main(String[] args) {
//线程一
new Thread(() -> new ApiTest().http_lt1("哪咤")).start();
//线程二
new Thread(() -> {
new ApiTest().http_lt2("悟空");
}).start();
}
public void http_lt1(String name) {
try {
Thread.sleep((long) (Math.random() * 500));
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println("测试结果：hi1 " + name);
http_lt2(name);
}
public void http_lt2(String name) {
try {
Thread.sleep((long) (Math.random() * 500));
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println("测试结果：hi2 " + name);
http_lt3(name);
}
public void http_lt3(String name) {
try {
Thread.sleep((long) (Math.random() * 500));
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println("测试结果：hi3 " + name);
}
}
测试结果
基于javaagent链路追踪｛源码微信公众号：bugstack虫洞栈｝
==========================================================
onTransformation：class org.itstack.demo.test.ApiTest
测试结果：hi2 悟空
测试结果：hi1 哪咤
测试结果：hi3 悟空
链路追踪(MQ)：608a1cbf-ef1f-4195-bdc7-c3729a114f8d org.itstack.demo.test.ApiTest.http_lt3 耗时：111ms
测试结果：hi2 哪咤
init: 192MB max: 2708MB used: 43MB committed: 184MB use rate: 23%
init: 2MB max: 0MB used: 13MB committed: 14MB use rate: 95%
name: PS Scavenge count:0 took:0 pool name:[PS Eden Space, PS Survivor Space]
name: PS MarkSweep count:0 took:0 pool name:[PS Eden Space, PS Survivor Space, PS Old Gen]
-------------------------------------------------------------------------------------------------
链路追踪(MQ)：608a1cbf-ef1f-4195-bdc7-c3729a114f8d org.itstack.demo.test.ApiTest.http_lt2 耗时：338ms
init: 192MB max: 2708MB used: 43MB committed: 184MB use rate: 23%
init: 2MB max: 0MB used: 13MB committed: 14MB use rate: 95%
name: PS Scavenge count:0 took:0 pool name:[PS Eden Space, PS Survivor Space]
name: PS MarkSweep count:0 took:0 pool name:[PS Eden Space, PS Survivor Space, PS Old Gen]
-------------------------------------------------------------------------------------------------
测试结果：hi3 哪咤
链路追踪(MQ)：2f28ed75-650a-4f0f-bd69-fe0709a8985e org.itstack.demo.test.ApiTest.http_lt3 耗时：221ms
init: 192MB max: 2708MB used: 43MB committed: 184MB use rate: 23%
init: 2MB max: 0MB used: 13MB committed: 14MB use rate: 95%
name: PS Scavenge count:0 took:0 pool name:[PS Eden Space, PS Survivor Space]
name: PS MarkSweep count:0 took:0 pool name:[PS Eden Space, PS Survivor Space, PS Old Gen]
-------------------------------------------------------------------------------------------------
链路追踪(MQ)：2f28ed75-650a-4f0f-bd69-fe0709a8985e org.itstack.demo.test.ApiTest.http_lt2 耗时：316ms
init: 192MB max: 2708MB used: 43MB committed: 184MB use rate: 23%
init: 2MB max: 0MB used: 13MB committed: 14MB use rate: 95%
name: PS Scavenge count:0 took:0 pool name:[PS Eden Space, PS Survivor Space]
name: PS MarkSweep count:0 took:0 pool name:[PS Eden Space, PS Survivor Space, PS Old Gen]
-------------------------------------------------------------------------------------------------
链路追踪(MQ)：2f28ed75-650a-4f0f-bd69-fe0709a8985e org.itstack.demo.test.ApiTest.http_lt1 耗时：547ms
init: 192MB max: 2708MB used: 43MB committed: 184MB use rate: 23%
init: 2MB max: 0MB used: 13MB committed: 14MB use rate: 95%
name: PS Scavenge count:0 took:0 pool name:[PS Eden Space, PS Survivor Space]
name: PS MarkSweep count:0 took:0 pool name:[PS Eden Space, PS Survivor Space, PS Old Gen]
-------------------------------------------------------------------------------------------------
Process finished with exit code 0
