动态代理Cglib原理

1. 工具使用:HSDB

java -classpath "%JAVA_HOME%/lib/sa-jdi.jar" sun.jvm.hotspot.HSDB

2. 测试代码:(对Subject中的方法增强打印开始时间和结束时间)

public class TestEnhancer {
    public static class Subject {
        public void sayHi() {
            System.out.println("Hi...");
        }
    }
    public static void main(String[] args) {
        RuntimeMXBean runtimeMXBean = ManagementFactory.getRuntimeMXBean();
        System.out.println("pid="+runtimeMXBean.getName().split("@")[0]);
        Enhancer enhancer = new Enhancer();
        enhancer.setSuperclass(Subject.class);
        enhancer.setCallback(new MethodInterceptor() {
            @Override
            public Object intercept(Object obj, Method method, Object[] args, MethodProxy methodProxy) throws Throwable {
                // obj为代理后对象 method的被代理对象的方法
                methodProxy.getSuperIndex();//为了调用MethodProxy.init()初始化FastClassInfo
                //TODO 2:MethodProxy中内部类FastClassInfo
                System.out.println("开始时间:"+System.currentTimeMillis());
                Object invokeSuper = methodProxy.invokeSuper(obj, args);////TODO 3:MethodProxy#invokeSuper
                System.out.println("结束时间:"+System.currentTimeMillis());

                //Object invoke = methodProxy.invoke(obj, args);//TODO 4:MethodProxy#invoke
                return invokeSuper;
            }
        });
        Subject subject = (Subject)enhancer.create();
        //TODO 1:enhancer.create()生成的类
        subject.sayHi();
    }
}

在 Enhancer  使用过程我们自定组装callbacks
enhancer.setCallbackTypes(types)
enhancer.setCallbacks(callbacks)
enhancer.setCallbackFilter()    CallbackFilter中的accept通过method的类型返回callbacks位置 从0 开始
pid=8880
开始时间:1543369816360
Hi...
结束时间:1543369816360

3. 断点获取如下信息:

subject.getClass().getSimpleName()=TestEnhancer$Subject$$EnhancerByCGLIB$$842aea1f
methodProxy.fastClassInfo.f1.getClass().getSimpleName()=TestEnhancer$Subject$$FastClassByCGLIB$$d29eb9b3
methodProxy.fastClassInfo.i1=0
methodProxy.fastClassInfo.f2.getClass().getSimpleName()=TestEnhancer$Subject$$EnhancerByCGLIB$$842aea1f$$FastClassByCGLIB$$eb17910f
methodProxy.fastClassInfo.i2=18

4. 使用HSDB查看当前内存中的以TestEnhancer$Subject开头的类,并将class字节码保存

动态代理Cglib原理（图一）.png

4.1 反编译:TestEnhancer&Subject&&EnhancerByCGLIB&&842aea1f

import java.lang.reflect.Method;
import org.assertj.core.internal.cglib.core.ReflectUtils;
import org.assertj.core.internal.cglib.core.Signature;
import org.assertj.core.internal.cglib.proxy.Callback;
import org.assertj.core.internal.cglib.proxy.Factory;
import org.assertj.core.internal.cglib.proxy.MethodInterceptor;
import org.assertj.core.internal.cglib.proxy.MethodProxy;
import zk.curator.TestEnhancer.Subject;

public class TestEnhancer$Subject$$EnhancerByCGLIB$$842aea1f extends Subject implements Factory {
    private boolean CGLIB$BOUND;
    public static Object CGLIB$FACTORY_DATA;
    private static final ThreadLocal CGLIB$THREAD_CALLBACKS;
    private static final Callback[] CGLIB$STATIC_CALLBACKS;
    private MethodInterceptor CGLIB$CALLBACK_0;
    private static Object CGLIB$CALLBACK_FILTER;
    private static final Method CGLIB$sayHi$0$Method;
    private static final MethodProxy CGLIB$sayHi$0$Proxy;
    private static final Object[] CGLIB$emptyArgs;
    private static final Method CGLIB$equals$1$Method;
    private static final MethodProxy CGLIB$equals$1$Proxy;
    private static final Method CGLIB$toString$2$Method;
    private static final MethodProxy CGLIB$toString$2$Proxy;
    private static final Method CGLIB$hashCode$3$Method;
    private static final MethodProxy CGLIB$hashCode$3$Proxy;
    private static final Method CGLIB$clone$4$Method;
    private static final MethodProxy CGLIB$clone$4$Proxy;

    public TestEnhancer$Subject$$EnhancerByCGLIB$$842aea1f() {
        CGLIB$BIND_CALLBACKS(this);
    }

    static {
        CGLIB$STATICHOOK1();
    }

    public final boolean equals(Object var1) {
        MethodInterceptor var10000 = this.CGLIB$CALLBACK_0;
        if(this.CGLIB$CALLBACK_0 == null) {
            CGLIB$BIND_CALLBACKS(this);
            var10000 = this.CGLIB$CALLBACK_0;
        }

        if(var10000 != null) {
            Object var2 = var10000.intercept(this, CGLIB$equals$1$Method, new Object[]{var1}, CGLIB$equals$1$Proxy);
            return var2 == null?false:((Boolean)var2).booleanValue();
        } else {
            return super.equals(var1);
        }
    }

    public final String toString() {
        MethodInterceptor var10000 = this.CGLIB$CALLBACK_0;
        if(this.CGLIB$CALLBACK_0 == null) {
            CGLIB$BIND_CALLBACKS(this);
            var10000 = this.CGLIB$CALLBACK_0;
        }

        return var10000 != null?(String)var10000.intercept(this, CGLIB$toString$2$Method, CGLIB$emptyArgs, CGLIB$toString$2$Proxy):super.toString();
    }

    public final int hashCode() {
        MethodInterceptor var10000 = this.CGLIB$CALLBACK_0;
        if(this.CGLIB$CALLBACK_0 == null) {
            CGLIB$BIND_CALLBACKS(this);
            var10000 = this.CGLIB$CALLBACK_0;
        }

        if(var10000 != null) {
            Object var1 = var10000.intercept(this, CGLIB$hashCode$3$Method, CGLIB$emptyArgs, CGLIB$hashCode$3$Proxy);
            return var1 == null?0:((Number)var1).intValue();
        } else {
            return super.hashCode();
        }
    }

    protected final Object clone() throws CloneNotSupportedException {
        MethodInterceptor var10000 = this.CGLIB$CALLBACK_0;
        if(this.CGLIB$CALLBACK_0 == null) {
            CGLIB$BIND_CALLBACKS(this);
            var10000 = this.CGLIB$CALLBACK_0;
        }

        return var10000 != null?var10000.intercept(this, CGLIB$clone$4$Method, CGLIB$emptyArgs, CGLIB$clone$4$Proxy):super.clone();
    }

    public Object newInstance(Callback var1) {
        CGLIB$SET_THREAD_CALLBACKS(new Callback[]{var1});
        TestEnhancer$Subject$$EnhancerByCGLIB$$842aea1f var10000 = new TestEnhancer$Subject$$EnhancerByCGLIB$$842aea1f();
        CGLIB$SET_THREAD_CALLBACKS((Callback[])null);
        return var10000;
    }

    public Object newInstance(Callback[] var1) {
        CGLIB$SET_THREAD_CALLBACKS(var1);
        TestEnhancer$Subject$$EnhancerByCGLIB$$842aea1f var10000 = new TestEnhancer$Subject$$EnhancerByCGLIB$$842aea1f();
        CGLIB$SET_THREAD_CALLBACKS((Callback[])null);
        return var10000;
    }

    public Object newInstance(Class[] var1, Object[] var2, Callback[] var3) {
        CGLIB$SET_THREAD_CALLBACKS(var3);
        TestEnhancer$Subject$$EnhancerByCGLIB$$842aea1f var10000 = new TestEnhancer$Subject$$EnhancerByCGLIB$$842aea1f;
        switch(var1.length) {
        case 0:
            var10000.<init>();
            CGLIB$SET_THREAD_CALLBACKS((Callback[])null);
            return var10000;
        default:
            throw new IllegalArgumentException("Constructor not found");
        }
    }

    public void setCallback(int var1, Callback var2) {
        switch(var1) {
        case 0:
            this.CGLIB$CALLBACK_0 = (MethodInterceptor)var2;
        default:
        }
    }

    public final void sayHi() {
        MethodInterceptor var10000 = this.CGLIB$CALLBACK_0;
        if(this.CGLIB$CALLBACK_0 == null) {
            CGLIB$BIND_CALLBACKS(this);
            var10000 = this.CGLIB$CALLBACK_0;
        }

        if(var10000 != null) {
            var10000.intercept(this, CGLIB$sayHi$0$Method, CGLIB$emptyArgs, CGLIB$sayHi$0$Proxy);
        } else {
            super.sayHi();
        }
    }

    public static void CGLIB$SET_STATIC_CALLBACKS(Callback[] var0) {
        CGLIB$STATIC_CALLBACKS = var0;
    }

    public void setCallbacks(Callback[] var1) {
        this.CGLIB$CALLBACK_0 = (MethodInterceptor)var1[0];
    }

    public static void CGLIB$SET_THREAD_CALLBACKS(Callback[] var0) {
        CGLIB$THREAD_CALLBACKS.set(var0);
    }

    public static MethodProxy CGLIB$findMethodProxy(Signature var0) {
        String var10000 = var0.toString();
        switch(var10000.hashCode()) {
        case -2012941911:
            if(var10000.equals("sayHi()V")) {
                return CGLIB$sayHi$0$Proxy;
            }
            break;
        case -508378822:
            if(var10000.equals("clone()Ljava/lang/Object;")) {
                return CGLIB$clone$4$Proxy;
            }
            break;
        case 1826985398:
            if(var10000.equals("equals(Ljava/lang/Object;)Z")) {
                return CGLIB$equals$1$Proxy;
            }
            break;
        case 1913648695:
            if(var10000.equals("toString()Ljava/lang/String;")) {
                return CGLIB$toString$2$Proxy;
            }
            break;
        case 1984935277:
            if(var10000.equals("hashCode()I")) {
                return CGLIB$hashCode$3$Proxy;
            }
        }

        return null;
    }

    final String CGLIB$toString$2() {
        return super.toString();
    }

    final int CGLIB$hashCode$3() {
        return super.hashCode();
    }

    final Object CGLIB$clone$4() throws CloneNotSupportedException {
        return super.clone();
    }

    public Callback getCallback(int var1) {
        CGLIB$BIND_CALLBACKS(this);
        MethodInterceptor var10000;
        switch(var1) {
        case 0:
            var10000 = this.CGLIB$CALLBACK_0;
            break;
        default:
            var10000 = null;
        }

        return var10000;
    }

    public Callback[] getCallbacks() {
        CGLIB$BIND_CALLBACKS(this);
        return new Callback[]{this.CGLIB$CALLBACK_0};
    }

    final void CGLIB$sayHi$0() {
        super.sayHi();
    }

    final boolean CGLIB$equals$1(Object var1) {
        return super.equals(var1);
    }

    static void CGLIB$STATICHOOK1() {
        CGLIB$THREAD_CALLBACKS = new ThreadLocal();
        CGLIB$emptyArgs = new Object[0];
        Class var0 = Class.forName("zk.curator.TestEnhancer$Subject$$EnhancerByCGLIB$$842aea1f");
        Class var1;
        Method[] var10000 = ReflectUtils.findMethods(new String[]{"equals", "(Ljava/lang/Object;)Z", "toString", "()Ljava/lang/String;", "hashCode", "()I", "clone", "()Ljava/lang/Object;"}, (var1 = Class.forName("java.lang.Object")).getDeclaredMethods());
        CGLIB$equals$1$Method = var10000[0];
        CGLIB$equals$1$Proxy = MethodProxy.create(var1, var0, "(Ljava/lang/Object;)Z", "equals", "CGLIB$equals$1");
        CGLIB$toString$2$Method = var10000[1];
        CGLIB$toString$2$Proxy = MethodProxy.create(var1, var0, "()Ljava/lang/String;", "toString", "CGLIB$toString$2");
        CGLIB$hashCode$3$Method = var10000[2];
        CGLIB$hashCode$3$Proxy = MethodProxy.create(var1, var0, "()I", "hashCode", "CGLIB$hashCode$3");
        CGLIB$clone$4$Method = var10000[3];
        CGLIB$clone$4$Proxy = MethodProxy.create(var1, var0, "()Ljava/lang/Object;", "clone", "CGLIB$clone$4");
        CGLIB$sayHi$0$Method = ReflectUtils.findMethods(new String[]{"sayHi", "()V"}, (var1 = Class.forName("zk.curator.TestEnhancer$Subject")).getDeclaredMethods())[0];
        CGLIB$sayHi$0$Proxy = MethodProxy.create(var1, var0, "()V", "sayHi", "CGLIB$sayHi$0");
    }

    private static final void CGLIB$BIND_CALLBACKS(Object var0) {
        TestEnhancer$Subject$$EnhancerByCGLIB$$842aea1f var1 = (TestEnhancer$Subject$$EnhancerByCGLIB$$842aea1f)var0;
        if(!var1.CGLIB$BOUND) {
            var1.CGLIB$BOUND = true;
            Object var10000 = CGLIB$THREAD_CALLBACKS.get();
            if(var10000 == null) {
                var10000 = CGLIB$STATIC_CALLBACKS;
                if(CGLIB$STATIC_CALLBACKS == null) {
                    return;
                }
            }

            var1.CGLIB$CALLBACK_0 = (MethodInterceptor)((Callback[])var10000)[0];
        }

    }
}

4.2 反编译:TestEnhancer&Subject&&FastClassByCGLIB&&d29eb9b3

import java.lang.reflect.InvocationTargetException;
import org.assertj.core.internal.cglib.core.Signature;
import org.assertj.core.internal.cglib.reflect.FastClass;
import zk.curator.TestEnhancer.Subject;

public class TestEnhancer$Subject$$FastClassByCGLIB$$d29eb9b3 extends FastClass {
    public Object invoke(int var1, Object var2, Object[] var3) throws InvocationTargetException {
        Subject var10000 = (Subject)var2;
        int var10001 = var1;

        try {
            switch(var10001) {
            case 0:
                var10000.sayHi();
                return null;
            case 1:
                return new Boolean(var10000.equals(var3[0]));
            case 2:
                return var10000.toString();
            case 3:
                return new Integer(var10000.hashCode());
            }
        } catch (Throwable var4) {
            throw new InvocationTargetException(var4);
        }

        throw new IllegalArgumentException("Cannot find matching method/constructor");
    }

    public TestEnhancer$Subject$$FastClassByCGLIB$$d29eb9b3(Class var1) {
        super(var1);
    }

    public Object newInstance(int var1, Object[] var2) throws InvocationTargetException {
        Subject var10000 = new Subject;
        Subject var10001 = var10000;
        int var10002 = var1;

        try {
            switch(var10002) {
            case 0:
                var10001.<init>();
                return var10000;
            }
        } catch (Throwable var3) {
            throw new InvocationTargetException(var3);
        }

        throw new IllegalArgumentException("Cannot find matching method/constructor");
    }

    public int getIndex(Class[] var1) {
        switch(var1.length) {
        case 0:
            return 0;
        default:
            return -1;
        }
    }

    public int getIndex(String var1, Class[] var2) {
        switch(var1.hashCode()) {
        case -1776922004:
            if(var1.equals("toString")) {
                switch(var2.length) {
                case 0:
                    return 2;
                }
            }
            break;
        case -1295482945:
            if(var1.equals("equals")) {
                switch(var2.length) {
                case 1:
                    if(var2[0].getName().equals("java.lang.Object")) {
                        return 1;
                    }
                }
            }
            break;
        case 109213260:
            if(var1.equals("sayHi")) {
                switch(var2.length) {
                case 0:
                    return 0;
                }
            }
            break;
        case 147696667:
            if(var1.equals("hashCode")) {
                switch(var2.length) {
                case 0:
                    return 3;
                }
            }
        }

        return -1;
    }

    public int getIndex(Signature var1) {
        String var10000 = var1.toString();
        switch(var10000.hashCode()) {
        case -2012941911:
            if(var10000.equals("sayHi()V")) {
                return 0;
            }
            break;
        case 1826985398:
            if(var10000.equals("equals(Ljava/lang/Object;)Z")) {
                return 1;
            }
            break;
        case 1913648695:
            if(var10000.equals("toString()Ljava/lang/String;")) {
                return 2;
            }
            break;
        case 1984935277:
            if(var10000.equals("hashCode()I")) {
                return 3;
            }
        }

        return -1;
    }

    public int getMaxIndex() {
        return 3;
    }
}

4.3 反编译:TestEnhancer&Subject&&EnhancerByCGLIB&&842aea1f&&FastClassByCGLIB$$eb17910f

//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by Fernflower decompiler)
//

package zk.curator;

import java.lang.reflect.InvocationTargetException;
import org.assertj.core.internal.cglib.core.Signature;
import org.assertj.core.internal.cglib.proxy.Callback;
import org.assertj.core.internal.cglib.reflect.FastClass;
import zk.curator.TestEnhancer.Subject..EnhancerByCGLIB..842aea1f;

public class TestEnhancer$Subject$$EnhancerByCGLIB$$842aea1f$$FastClassByCGLIB$$eb17910f extends FastClass {
    public Object invoke(int var1, Object var2, Object[] var3) throws InvocationTargetException {
        842aea1f var10000 = (842aea1f)var2;
        int var10001 = var1;

        try {
            switch(var10001) {
            case 0:
                return new Boolean(var10000.equals(var3[0]));
            case 1:
                return var10000.toString();
            case 2:
                return new Integer(var10000.hashCode());
            case 3:
                return var10000.clone();
            case 4:
                return var10000.newInstance((Callback)var3[0]);
            case 5:
                return var10000.newInstance((Callback[])var3[0]);
            case 6:
                return var10000.newInstance((Class[])var3[0], (Object[])var3[1], (Callback[])var3[2]);
            case 7:
                var10000.setCallback(((Number)var3[0]).intValue(), (Callback)var3[1]);
                return null;
            case 8:
                var10000.sayHi();
                return null;
            case 9:
                842aea1f.CGLIB$SET_STATIC_CALLBACKS((Callback[])var3[0]);
                return null;
            case 10:
                var10000.setCallbacks((Callback[])var3[0]);
                return null;
            case 11:
                842aea1f.CGLIB$SET_THREAD_CALLBACKS((Callback[])var3[0]);
                return null;
            case 12:
                return 842aea1f.CGLIB$findMethodProxy((Signature)var3[0]);
            case 13:
                return var10000.CGLIB$toString$2();
            case 14:
                return new Integer(var10000.CGLIB$hashCode$3());
            case 15:
                return var10000.CGLIB$clone$4();
            case 16:
                return var10000.getCallback(((Number)var3[0]).intValue());
            case 17:
                return var10000.getCallbacks();
            case 18:
                var10000.CGLIB$sayHi$0();
                return null;
            case 19:
                return new Boolean(var10000.CGLIB$equals$1(var3[0]));
            case 20:
                842aea1f.CGLIB$STATICHOOK1();
                return null;
            }
        } catch (Throwable var4) {
            throw new InvocationTargetException(var4);
        }

        throw new IllegalArgumentException("Cannot find matching method/constructor");
    }

    public TestEnhancer$Subject$$EnhancerByCGLIB$$842aea1f$$FastClassByCGLIB$$eb17910f(Class var1) {
        super(var1);
    }

    public Object newInstance(int var1, Object[] var2) throws InvocationTargetException {
        842aea1f var10000 = new 842aea1f;
        842aea1f var10001 = var10000;
        int var10002 = var1;

        try {
            switch(var10002) {
            case 0:
                var10001.<init>();
                return var10000;
            }
        } catch (Throwable var3) {
            throw new InvocationTargetException(var3);
        }

        throw new IllegalArgumentException("Cannot find matching method/constructor");
    }

    public int getIndex(Class[] var1) {
        switch(var1.length) {
        case 0:
            return 0;
        default:
            return -1;
        }
    }

    public int getIndex(String var1, Class[] var2) {
        switch(var1.hashCode()) {
        case -1776922004:
            if(var1.equals("toString")) {
                switch(var2.length) {
                case 0:
                    return 1;
                }
            }
            break;
        case -1334646347:
            if(var1.equals("CGLIB$sayHi$0")) {
                switch(var2.length) {
                case 0:
                    return 18;
                }
            }
            break;
        case -1295482945:
            if(var1.equals("equals")) {
                switch(var2.length) {
                case 1:
                    if(var2[0].getName().equals("java.lang.Object")) {
                        return 0;
                    }
                }
            }
            break;
        case -1053468136:
            if(var1.equals("getCallbacks")) {
                switch(var2.length) {
                case 0:
                    return 17;
                }
            }
            break;
        case -124978609:
            if(var1.equals("CGLIB$equals$1")) {
                switch(var2.length) {
                case 1:
                    if(var2[0].getName().equals("java.lang.Object")) {
                        return 19;
                    }
                }
            }
            break;
        case -60403779:
            if(var1.equals("CGLIB$SET_STATIC_CALLBACKS")) {
                switch(var2.length) {
                case 1:
                    if(var2[0].getName().equals("[Lorg.assertj.core.internal.cglib.proxy.Callback;")) {
                        return 9;
                    }
                }
            }
            break;
        case -29025555:
            if(var1.equals("CGLIB$hashCode$3")) {
                switch(var2.length) {
                case 0:
                    return 14;
                }
            }
            break;
        case 85179481:
            if(var1.equals("CGLIB$SET_THREAD_CALLBACKS")) {
                switch(var2.length) {
                case 1:
                    if(var2[0].getName().equals("[Lorg.assertj.core.internal.cglib.proxy.Callback;")) {
                        return 11;
                    }
                }
            }
            break;
        case 94756189:
            if(var1.equals("clone")) {
                switch(var2.length) {
                case 0:
                    return 3;
                }
            }
            break;
        case 109213260:
            if(var1.equals("sayHi")) {
                switch(var2.length) {
                case 0:
                    return 8;
                }
            }
            break;
        case 147696667:
            if(var1.equals("hashCode")) {
                switch(var2.length) {
                case 0:
                    return 2;
                }
            }
            break;
        case 161998109:
            if(var1.equals("CGLIB$STATICHOOK1")) {
                switch(var2.length) {
                case 0:
                    return 20;
                }
            }
            break;
        case 495524492:
            if(var1.equals("setCallbacks")) {
                switch(var2.length) {
                case 1:
                    if(var2[0].getName().equals("[Lorg.assertj.core.internal.cglib.proxy.Callback;")) {
                        return 10;
                    }
                }
            }
            break;
        case 1154623345:
            if(var1.equals("CGLIB$findMethodProxy")) {
                switch(var2.length) {
                case 1:
                    if(var2[0].getName().equals("org.assertj.core.internal.cglib.core.Signature")) {
                        return 12;
                    }
                }
            }
            break;
        case 1543336189:
            if(var1.equals("CGLIB$toString$2")) {
                switch(var2.length) {
                case 0:
                    return 13;
                }
            }
            break;
        case 1811874389:
            if(var1.equals("newInstance")) {
                switch(var2.length) {
                case 1:
                    String var10001 = var2[0].getName();
                    switch(var10001.hashCode()) {
                    case -1926028830:
                        if(var10001.equals("[Lorg.assertj.core.internal.cglib.proxy.Callback;")) {
                            return 5;
                        }
                        break;
                    case -615274520:
                        if(var10001.equals("org.assertj.core.internal.cglib.proxy.Callback")) {
                            return 4;
                        }
                    }
                case 2:
                default:
                    break;
                case 3:
                    if(var2[0].getName().equals("[Ljava.lang.Class;") && var2[1].getName().equals("[Ljava.lang.Object;") && var2[2].getName().equals("[Lorg.assertj.core.internal.cglib.proxy.Callback;")) {
                        return 6;
                    }
                }
            }
            break;
        case 1817099975:
            if(var1.equals("setCallback")) {
                switch(var2.length) {
                case 2:
                    if(var2[0].getName().equals("int") && var2[1].getName().equals("org.assertj.core.internal.cglib.proxy.Callback")) {
                        return 7;
                    }
                }
            }
            break;
        case 1905679803:
            if(var1.equals("getCallback")) {
                switch(var2.length) {
                case 1:
                    if(var2[0].getName().equals("int")) {
                        return 16;
                    }
                }
            }
            break;
        case 1951977610:
            if(var1.equals("CGLIB$clone$4")) {
                switch(var2.length) {
                case 0:
                    return 15;
                }
            }
        }

        return -1;
    }

    public int getIndex(Signature var1) {
        String var10000 = var1.toString();
        switch(var10000.hashCode()) {
        case -2012941911:
            if(var10000.equals("sayHi()V")) {
                return 8;
            }
            break;
        case -2011053341:
            if(var10000.equals("newInstance([Ljava/lang/Class;[Ljava/lang/Object;[Lorg/assertj/core/internal/cglib/proxy/Callback;)Ljava/lang/Object;")) {
                return 6;
            }
            break;
        case -1937024608:
            if(var10000.equals("CGLIB$sayHi$0()V")) {
                return 18;
            }
            break;
        case -1882565338:
            if(var10000.equals("CGLIB$equals$1(Ljava/lang/Object;)Z")) {
                return 19;
            }
            break;
        case -1457535688:
            if(var10000.equals("CGLIB$STATICHOOK1()V")) {
                return 20;
            }
            break;
        case -1411842725:
            if(var10000.equals("CGLIB$hashCode$3()I")) {
                return 14;
            }
            break;
        case -1372377760:
            if(var10000.equals("CGLIB$SET_STATIC_CALLBACKS([Lorg/assertj/core/internal/cglib/proxy/Callback;)V")) {
                return 9;
            }
            break;
        case -1315638312:
            if(var10000.equals("setCallback(ILorg/assertj/core/internal/cglib/proxy/Callback;)V")) {
                return 7;
            }
            break;
        case -508378822:
            if(var10000.equals("clone()Ljava/lang/Object;")) {
                return 3;
            }
            break;
        case -404209094:
            if(var10000.equals("newInstance([Lorg/assertj/core/internal/cglib/proxy/Callback;)Ljava/lang/Object;")) {
                return 5;
            }
            break;
        case 1120488528:
            if(var10000.equals("CGLIB$findMethodProxy(Lorg/assertj/core/internal/cglib/core/Signature;)Lorg/assertj/core/internal/cglib/proxy/MethodProxy;")) {
                return 12;
            }
            break;
        case 1306468936:
            if(var10000.equals("CGLIB$toString$2()Ljava/lang/String;")) {
                return 13;
            }
            break;
        case 1381033007:
            if(var10000.equals("newInstance(Lorg/assertj/core/internal/cglib/proxy/Callback;)Ljava/lang/Object;")) {
                return 4;
            }
            break;
        case 1406979248:
            if(var10000.equals("getCallback(I)Lorg/assertj/core/internal/cglib/proxy/Callback;")) {
                return 16;
            }
            break;
        case 1692040879:
            if(var10000.equals("setCallbacks([Lorg/assertj/core/internal/cglib/proxy/Callback;)V")) {
                return 10;
            }
            break;
        case 1800494055:
            if(var10000.equals("CGLIB$clone$4()Ljava/lang/Object;")) {
                return 15;
            }
            break;
        case 1826985398:
            if(var10000.equals("equals(Ljava/lang/Object;)Z")) {
                return 0;
            }
            break;
        case 1913648695:
            if(var10000.equals("toString()Ljava/lang/String;")) {
                return 1;
            }
            break;
        case 1984935277:
            if(var10000.equals("hashCode()I")) {
                return 2;
            }
            break;
        case 2097595388:
            if(var10000.equals("CGLIB$SET_THREAD_CALLBACKS([Lorg/assertj/core/internal/cglib/proxy/Callback;)V")) {
                return 11;
            }
            break;
        case 2127541637:
            if(var10000.equals("getCallbacks()[Lorg/assertj/core/internal/cglib/proxy/Callback;")) {
                return 17;
            }
        }

        return -1;
    }

    public int getMaxIndex() {
        return 20;
    }
}

5. 原理分析

在生成的TestEnhancer$Subject$$EnhancerByCGLIB$$xxxxxx存在两个方法sayHi()和CGLIB$sayHi$0(),在sayHi()中如果存在拦截器则走MethodInterceptor否则直接调用父类TestEnhancer$Subject的sayHi()方法
在拦截器中:
Subject 为 TestEnhancer$Subject$$EnhancerByCGLIB$$842aea1f父类
methodProxy.invoke  转为  ((Subject ) obj ).sayHi()
methodProxy.invokeSuper 转为((TestEnhancer$Subject$$EnhancerByCGLIB$$842aea1f) obj ).CGLIB$sayHi$0()

methodProxy.invoke(obj, args);           obj为代理类  方法:sayHi() 回到调用MethodInterceptor //这个会变为死循环
methodProxy.invokeSuper(obj, args); obj为代理类  :CGLIB$sayHi$0()  = super.sayHi()

methodProxy.invoke(obj, args);           obj为Subject   方法:sayHi()  执行被代理的方法
methodProxy.invokeSuper(obj, args); obj为Subject   装换报错