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jossc
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1.添加基础算法
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‎.idea/compiler.xml‎

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‎.idea/misc.xml‎

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‎agent/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<parent>
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<artifactId>basics.code</artifactId>
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<groupId>com.cz</groupId>
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<version>1.0-SNAPSHOT</version>
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</parent>
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<modelVersion>4.0.0</modelVersion>
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<packaging>jar</packaging>
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<artifactId>agent</artifactId>
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<build>
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<finalName>my-javaagent</finalName>
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<plugins>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-jar-plugin</artifactId>
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<configuration>
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<archive>
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<manifestEntries>
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<Agent-Class>com.cz.agent.AgentMain</Agent-Class>
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<Premain-Class>com.cz.agent.AgentPreMain</Premain-Class>
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<Can-Redefine-Classes>true</Can-Redefine-Classes>
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<Can-Retransform-Classes>true</Can-Retransform-Classes>
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</manifestEntries>
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</archive>
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</configuration>
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</plugin>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-compiler-plugin</artifactId>
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<configuration>
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<source>8</source>
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<target>8</target>
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</configuration>
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</plugin>
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</plugins>
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</build>
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</project>

‎agent/src/main/java/Test1.java‎

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/**
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* @ClassName Test1
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* @Author chenzhuo
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* @Version 1.0
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* @Date 2019-09-04 22:22
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**/
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public class Test1 {
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public static void main(String[] args) {
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System.out.println("in test01 main");
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}
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}

‎agent/src/main/java/com/cz/agent/AgentMain.java‎

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package com.cz.agent;
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import java.lang.instrument.Instrumentation;
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/**
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* @ClassName com.cz.AgentMain
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* @Author chenzhuo
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* @Version 1.0
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* @Date 2019-09-04 22:17
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**/
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public class AgentMain {
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public static void agentmain(String agentArgs, Instrumentation inst) {
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System.out.println("agentmain called: " + agentArgs);
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/**
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* 传入什么就返回什么
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* 不修改class 二进制文件
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*/
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inst.addTransformer((loader, className, classBeingRedefined,
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protectionDomain, classfileBuffer) -> {
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System.out.println("agentmain load Class :" + className);
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return classfileBuffer;
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},true);
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}
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}

‎agent/src/main/java/com/cz/agent/AgentPreMain.java‎

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package com.cz.agent;
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import java.io.IOException;
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import java.lang.instrument.ClassFileTransformer;
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import java.lang.instrument.IllegalClassFormatException;
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import java.lang.instrument.Instrumentation;
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import java.nio.file.Files;
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import java.nio.file.Path;
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import java.nio.file.Paths;
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import java.security.ProtectionDomain;
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/**
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* @ClassName AgentPreMain
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* @Author chenzhuo
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* @Version 1.0
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* @Date 2019-09-04 22:20
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**/
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public class AgentPreMain {
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public static class ClassLoggerTransformer implements ClassFileTransformer {
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@Override
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public byte[] transform(ClassLoader loader, String className, Class<?> classBeingRedefined, ProtectionDomain protectionDomain, byte[] classfileBuffer) throws IllegalClassFormatException {
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System.out.println("transform: " + className);
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Path path = Paths.get("/tmp/" + className.replaceAll("/", ".") + ".class");
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try {
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Files.write(path, classfileBuffer);
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} catch (IOException e) {
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e.printStackTrace();
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}
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return classfileBuffer;
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}
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}
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public static void premain(String agentArgument, Instrumentation instrumentation) {
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ClassFileTransformer classFileTransformer = new ClassLoggerTransformer();
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instrumentation.addTransformer(classFileTransformer, true);
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}
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}

‎pom.xml‎

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</plugin>
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</plugins>
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</build>
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<modules>
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<module>agent</module>
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</modules>
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<dependencies>

‎src/main/java/com/algorithm/package-info.java‎

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/**
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* 基础算法
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*/
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package com.algorithm;

‎src/main/java/com/concurrent/map/ConcurrentHashMapLearn.java‎

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package com.concurrent.map;
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import java.util.concurrent.ConcurrentHashMap;
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/**
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* @ClassName ConcurrentHashMapLearn
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* @Author chenzhuo
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* @Version 1.0
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* @Date 2019-08-20 22:40
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**/
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public class ConcurrentHashMapLearn {
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public static void main(String[] args) {
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ConcurrentHashMap<String, String> concurrentHashMap
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= new ConcurrentHashMap(16);
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concurrentHashMap.put("hhhh", "cccc");
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System.err.println(concurrentHashMap.entrySet());
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}
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}

‎src/main/java/com/jvm/bytecode/ReflectionTest.java‎

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package com.jvm.bytecode;
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import java.lang.reflect.Method;
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/**
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* @ClassName ReflectionTest
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* @Author chenzhuo
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* @Version 1.0
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* @Date 2019-08-28 22:25
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**/
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public class ReflectionTest {
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private static int count = 0;
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public static void foo(){
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new Exception("test#" + (count++)).printStackTrace();
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}
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public static void main(String[] args) throws Exception {
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Class<?> clazz= Class.forName("com.jvm.bytecode.ReflectionTest");
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Method method = clazz.getMethod("foo");
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for (int i = 0; i < 20; i++) {
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method.invoke(null);
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}
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}
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}

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