cglib动态代理
前面介绍了代理模式和JAVA动态代理，这片文章主要解析cglib动态代理实现。
基本介绍
CGLIB（Code Generation Library），是一个强大的，高性能，高质量的 Code 生成类库，它可以在运行期扩展 Java 类与实现 Java 接口。
pom
cglib
cglib
3.2.7
cglib案例
目标类
public interface UserService {
public void say();
public void say2();
}
public class UserServiceImpl implements UserService{
@Override
public void say() {
System.out.println("hello");
say2();
}
@Override
public void say2() {
System.out.println("hello2");
}
public final void finalMethod() {
System.out.println("final method");
}
public static void staticMethod() {
System.out.println("static method");
}
}方法拦截器
MethodInterceptor类似于jdk动态代理的InvocationHandler，方法调用前后进行增强。
public class MyInterceptor implements MethodInterceptor {
private Object target;
public MyInterceptor(Object target) {
this.target = target;
}
/**
*
* @param o 代理对象
* @param method 被代理对象的方法
* @param objects 方法入参
* @param methodProxy 代理方法
* @return
* @throws Throwable
*/
@Override
public Object intercept(Object o, Method method, Object[] objects, MethodProxy methodProxy) throws Throwable {
System.out.println("cglib before");
// 调用代理类FastClass对象
Object result = methodProxy.invokeSuper(o, objects);
// Object result = methodProxy.invoke(target, objects);
System.out.println("cglib after");
return result;
}
}客户端
public class CglibClient {
public static void main(String[] args) {
UserServiceImpl target = new UserServiceImpl();
// 代理类class文件存入本地磁盘方便我们反编译查看源码
System.setProperty(DebuggingClassWriter.DEBUG_LOCATION_PROPERTY, "./code");
// 通过CGLIB动态代理获取代理对象的过程
Enhancer enhancer = new Enhancer();
// 设置enhancer对象的父类
enhancer.setSuperclass(UserServiceImpl.class);
// 设置enhancer的回调对象
enhancer.setCallback(new MyInterceptor(target));
// 创建代理对象
UserServiceImpl userService = (UserServiceImpl)enhancer.create();
// 通过代理对象调用目标方法
userService.say();
userService.finalMethod();
UserServiceImpl.staticMethod();
}
}输出结果
cglib before
hello
cglib before
hello2
cglib after
cglib after
final method
static method打印结果显示，final，static等方法不会代码增强，say()方法内部调用say2()，say2()方法也会进行增强。具体原因后面代理类字节码反编译解释。
字节码解析
// 代理类class文件存入本地磁盘方便我们反编译查看源码
System.setProperty(DebuggingClassWriter.DEBUG_LOCATION_PROPERTY, "./code");设置如上系统参数，会在code目录打印cglib动态生成的代码
UserServiceImpl$$EnhancerByCGLIB$$30794112：cglib生成的代理类，继承被代理类UserServiceImpl，实现net.sf.cglib.proxy.Factory接口 UserServiceImpl$$EnhancerByCGLIB$$30794112$$FastClassByCGLIB$$5d581559：代理类UserServiceImpl$$EnhancerByCGLIB$$30794112的索引类，继承net.sf.cglib.reflect.FastClass，记录了代理类的所有方法的索引，通过索引调用代理类的对应方法。 UserServiceImpl$$FastClassByCGLIB$$667bfe0a：是被代理类proxy.UserServiceImpl的索引类。功能同上
代理类
代理类重写了被代理类的say,say2方法,还有Object的equals，toString，hashCode，clone方法，say方法内部调用proxy.cglib.MyInterceptor#intercept进行增强。
public class UserServiceImpl$$EnhancerByCGLIB$$30794112 extends UserServiceImpl 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$say2$0$Method;
private static final MethodProxy CGLIB$say2$0$Proxy;
private static final Object[] CGLIB$emptyArgs;
private static final Method CGLIB$say$1$Method;
private static final MethodProxy CGLIB$say$1$Proxy;
private static final Method CGLIB$equals$2$Method;
private static final MethodProxy CGLIB$equals$2$Proxy;
private static final Method CGLIB$toString$3$Method;
private static final MethodProxy CGLIB$toString$3$Proxy;
private static final Method CGLIB$hashCode$4$Method;
private static final MethodProxy CGLIB$hashCode$4$Proxy;
private static final Method CGLIB$clone$5$Method;
private static final MethodProxy CGLIB$clone$5$Proxy;
static void CGLIB$STATICHOOK1() {
CGLIB$THREAD_CALLBACKS = new ThreadLocal();
CGLIB$emptyArgs = new Object[0];
Class var0 = Class.forName("proxy.UserServiceImpl$$EnhancerByCGLIB$$30794112");
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$2$Method = var10000[0];
CGLIB$equals$2$Proxy = MethodProxy.create(var1, var0, "(Ljava/lang/Object;)Z", "equals", "CGLIB$equals$2");
CGLIB$toString$3$Method = var10000[1];
CGLIB$toString$3$Proxy = MethodProxy.create(var1, var0, "()Ljava/lang/String;", "toString", "CGLIB$toString$3");
CGLIB$hashCode$4$Method = var10000[2];
CGLIB$hashCode$4$Proxy = MethodProxy.create(var1, var0, "()I", "hashCode", "CGLIB$hashCode$4");
CGLIB$clone$5$Method = var10000[3];
CGLIB$clone$5$Proxy = MethodProxy.create(var1, var0, "()Ljava/lang/Object;", "clone", "CGLIB$clone$5");
var10000 = ReflectUtils.findMethods(new String[]{"say2", "()V", "say", "()V"}, (var1 = Class.forName("proxy.UserServiceImpl")).getDeclaredMethods());
CGLIB$say2$0$Method = var10000[0];
CGLIB$say2$0$Proxy = MethodProxy.create(var1, var0, "()V", "say2", "CGLIB$say2$0");
CGLIB$say$1$Method = var10000[1];
CGLIB$say$1$Proxy = MethodProxy.create(var1, var0, "()V", "say", "CGLIB$say$1");
}
final void CGLIB$say2$0() {
super.say2();
}
public final void say2() {
MethodInterceptor var10000 = this.CGLIB$CALLBACK_0;
if (var10000 == null) {
CGLIB$BIND_CALLBACKS(this);
var10000 = this.CGLIB$CALLBACK_0;
}
if (var10000 != null) {
var10000.intercept(this, CGLIB$say2$0$Method, CGLIB$emptyArgs, CGLIB$say2$0$Proxy);
} else {
super.say2();
}
}
final void CGLIB$say$1() {
super.say();
}
public final void say() {
MethodInterceptor var10000 = this.CGLIB$CALLBACK_0;
if (var10000 == null) {
CGLIB$BIND_CALLBACKS(this);
var10000 = this.CGLIB$CALLBACK_0;
}
if (var10000 != null) {
var10000.intercept(this, CGLIB$say$1$Method, CGLIB$emptyArgs, CGLIB$say$1$Proxy);
} else {
super.say();
}
}
final boolean CGLIB$equals$2(Object var1) {
return super.equals(var1);
}
public final boolean equals(Object var1) {
MethodInterceptor var10000 = this.CGLIB$CALLBACK_0;
if (var10000 == null) {
CGLIB$BIND_CALLBACKS(this);
var10000 = this.CGLIB$CALLBACK_0;
}
if (var10000 != null) {
Object var2 = var10000.intercept(this, CGLIB$equals$2$Method, new Object[]{var1}, CGLIB$equals$2$Proxy);
return var2 == null ? false : (Boolean)var2;
} else {
return super.equals(var1);
}
}
final String CGLIB$toString$3() {
return super.toString();
}
public final String toString() {
MethodInterceptor var10000 = this.CGLIB$CALLBACK_0;
if (var10000 == null) {
CGLIB$BIND_CALLBACKS(this);
var10000 = this.CGLIB$CALLBACK_0;
}
return var10000 != null ? (String)var10000.intercept(this, CGLIB$toString$3$Method, CGLIB$emptyArgs, CGLIB$toString$3$Proxy) : super.toString();
}
final int CGLIB$hashCode$4() {
return super.hashCode();
}
public final int hashCode() {
MethodInterceptor var10000 = this.CGLIB$CALLBACK_0;
if (var10000 == null) {
CGLIB$BIND_CALLBACKS(this);
var10000 = this.CGLIB$CALLBACK_0;
}
if (var10000 != null) {
Object var1 = var10000.intercept(this, CGLIB$hashCode$4$Method, CGLIB$emptyArgs, CGLIB$hashCode$4$Proxy);
return var1 == null ? 0 : ((Number)var1).intValue();
} else {
return super.hashCode();
}
}
final Object CGLIB$clone$5() throws CloneNotSupportedException {
return super.clone();
}
protected final Object clone() throws CloneNotSupportedException {
MethodInterceptor var10000 = this.CGLIB$CALLBACK_0;
if (var10000 == null) {
CGLIB$BIND_CALLBACKS(this);
var10000 = this.CGLIB$CALLBACK_0;
}
return var10000 != null ? var10000.intercept(this, CGLIB$clone$5$Method, CGLIB$emptyArgs, CGLIB$clone$5$Proxy) : super.clone();
}
public static MethodProxy CGLIB$findMethodProxy(Signature var0) {
String var10000 = var0.toString();
switch(var10000.hashCode()) {
case -909388886:
if (var10000.equals("say()V")) {
return CGLIB$say$1$Proxy;
}
break;
case -508378822:
if (var10000.equals("clone()Ljava/lang/Object;")) {
return CGLIB$clone$5$Proxy;
}
break;
case 1826985398:
if (var10000.equals("equals(Ljava/lang/Object;)Z")) {
return CGLIB$equals$2$Proxy;
}
break;
case 1874011246:
if (var10000.equals("say2()V")) {
return CGLIB$say2$0$Proxy;
}
break;
case 1913648695:
if (var10000.equals("toString()Ljava/lang/String;")) {
return CGLIB$toString$3$Proxy;
}
break;
case 1984935277:
if (var10000.equals("hashCode()I")) {
return CGLIB$hashCode$4$Proxy;
}
}
return null;
}
public UserServiceImpl$$EnhancerByCGLIB$$30794112() {
CGLIB$BIND_CALLBACKS(this);
}
public static void CGLIB$SET_THREAD_CALLBACKS(Callback[] var0) {
CGLIB$THREAD_CALLBACKS.set(var0);
}
public static void CGLIB$SET_STATIC_CALLBACKS(Callback[] var0) {
CGLIB$STATIC_CALLBACKS = var0;
}
private static final void CGLIB$BIND_CALLBACKS(Object var0) {
UserServiceImpl$$EnhancerByCGLIB$$30794112 var1 = (UserServiceImpl$$EnhancerByCGLIB$$30794112)var0;
if (!var1.CGLIB$BOUND) {
var1.CGLIB$BOUND = true;
Object var10000 = CGLIB$THREAD_CALLBACKS.get();
if (var10000 == null) {
var10000 = CGLIB$STATIC_CALLBACKS;
if (var10000 == null) {
return;
}
}
var1.CGLIB$CALLBACK_0 = (MethodInterceptor)((Callback[])var10000)[0];
}
}
public Object newInstance(Callback[] var1) {
CGLIB$SET_THREAD_CALLBACKS(var1);
UserServiceImpl$$EnhancerByCGLIB$$30794112 var10000 = new UserServiceImpl$$EnhancerByCGLIB$$30794112();
CGLIB$SET_THREAD_CALLBACKS((Callback[])null);
return var10000;
}
public Object newInstance(Callback var1) {
CGLIB$SET_THREAD_CALLBACKS(new Callback[]{var1});
UserServiceImpl$$EnhancerByCGLIB$$30794112 var10000 = new UserServiceImpl$$EnhancerByCGLIB$$30794112();
CGLIB$SET_THREAD_CALLBACKS((Callback[])null);
return var10000;
}
public Object newInstance(Class[] var1, Object[] var2, Callback[] var3) {
CGLIB$SET_THREAD_CALLBACKS(var3);
UserServiceImpl$$EnhancerByCGLIB$$30794112 var10000 = new UserServiceImpl$$EnhancerByCGLIB$$30794112;
switch(var1.length) {
case 0:
var10000.();
CGLIB$SET_THREAD_CALLBACKS((Callback[])null);
return var10000;
default:
throw new IllegalArgumentException("Constructor not found");
}
}
public Callback getCallback(int var1) {
CGLIB$BIND_CALLBACKS(this);
MethodInterceptor var10000;
switch(var1) {
case 0:
var10000 = this.CGLIB$CALLBACK_0;
break;
default:
var10000 = null;
}
return var10000;
}
public void setCallback(int var1, Callback var2) {
switch(var1) {
case 0:
this.CGLIB$CALLBACK_0 = (MethodInterceptor)var2;
default:
}
}
public Callback[] getCallbacks() {
CGLIB$BIND_CALLBACKS(this);
return new Callback[]{this.CGLIB$CALLBACK_0};
}
public void setCallbacks(Callback[] var1) {
this.CGLIB$CALLBACK_0 = (MethodInterceptor)var1[0];
}
static {
CGLIB$STATICHOOK1();
}
} 代理类索引类（继承FastClass）
记录了代理类UserServiceImpl$EnhancerByCGLIB$30794112的所有方法的索引，通过proxy.UserServiceImpl$EnhancerByCGLIB$30794112$FastClassByCGLIB$5d581559#getIndex(net.sf.cglib.core.Signature)获取索引，通过proxy.UserServiceImpl$EnhancerByCGLIB$30794112$FastClassByCGLIB$5d581559#invoke方法，根据索引调用对应的代理类的方法。
public class UserServiceImpl$$EnhancerByCGLIB$$30794112$$FastClassByCGLIB$$5d581559 extends FastClass {
public UserServiceImpl$$EnhancerByCGLIB$$30794112$$FastClassByCGLIB$$5d581559(Class var1) {
super(var1);
}
public int getIndex(Signature var1) {
String var10000 = var1.toString();
switch(var10000.hashCode()) {
case -2055565910:
if (var10000.equals("CGLIB$SET_THREAD_CALLBACKS([Lnet/sf/cglib/proxy/Callback;)V")) {
return 5;
}
break;
case -1457535688:
if (var10000.equals("CGLIB$STATICHOOK1()V")) {
return 8;
}
break;
case -1411812934:
if (var10000.equals("CGLIB$hashCode$4()I")) {
return 13;
}
break;
case -909388886:
if (var10000.equals("say()V")) {
return 1;
}
break;
case -894172689:
if (var10000.equals("newInstance(Lnet/sf/cglib/proxy/Callback;)Ljava/lang/Object;")) {
return 22;
}
break;
case -623122092:
if (var10000.equals("CGLIB$findMethodProxy(Lnet/sf/cglib/core/Signature;)Lnet/sf/cglib/proxy/MethodProxy;")) {
return 15;
}
break;
case -560613858:
if (var10000.equals("finalMethod()V")) {
return 23;
}
break;
case -508378822:
if (var10000.equals("clone()Ljava/lang/Object;")) {
return 19;
}
break;
case -419626537:
if (var10000.equals("setCallbacks([Lnet/sf/cglib/proxy/Callback;)V")) {
return 3;
}
break;
case 374345669:
if (var10000.equals("CGLIB$equals$2(Ljava/lang/Object;)Z")) {
return 11;
}
break;
case 560567118:
if (var10000.equals("setCallback(ILnet/sf/cglib/proxy/Callback;)V")) {
return 2;
}
break;
case 811063227:
if (var10000.equals("newInstance([Ljava/lang/Class;[Ljava/lang/Object;[Lnet/sf/cglib/proxy/Callback;)Ljava/lang/Object;")) {
return 21;
}
break;
case 906868927:
if (var10000.equals("CGLIB$say2$0()V")) {
return 9;
}
break;
case 973717575:
if (var10000.equals("getCallbacks()[Lnet/sf/cglib/proxy/Callback;")) {
return 7;
}
break;
case 1221173700:
if (var10000.equals("newInstance([Lnet/sf/cglib/proxy/Callback;)Ljava/lang/Object;")) {
return 20;
}
break;
case 1230699260:
if (var10000.equals("getCallback(I)Lnet/sf/cglib/proxy/Callback;")) {
return 6;
}
break;
case 1517819849:
if (var10000.equals("CGLIB$toString$3()Ljava/lang/String;")) {
return 12;
}
break;
case 1540724864:
if (var10000.equals("CGLIB$say$1()V")) {
return 10;
}
break;
case 1584330438:
if (var10000.equals("CGLIB$SET_STATIC_CALLBACKS([Lnet/sf/cglib/proxy/Callback;)V")) {
return 4;
}
break;
case 1625931814:
if (var10000.equals("staticMethod()V")) {
return 24;
}
break;
case 1826985398:
if (var10000.equals("equals(Ljava/lang/Object;)Z")) {
return 16;
}
break;
case 1874011246:
if (var10000.equals("say2()V")) {
return 0;
}
break;
case 1913648695:
if (var10000.equals("toString()Ljava/lang/String;")) {
return 17;
}
break;
case 1984935277:
if (var10000.equals("hashCode()I")) {
return 18;
}
break;
case 2011844968:
if (var10000.equals("CGLIB$clone$5()Ljava/lang/Object;")) {
return 14;
}
}
return -1;
}
public int getIndex(String var1, Class[] var2) {
switch(var1.hashCode()) {
case -1776922004:
if (var1.equals("toString")) {
switch(var2.length) {
case 0:
return 17;
}
}
break;
case -1295482945:
if (var1.equals("equals")) {
switch(var2.length) {
case 1:
if (var2[0].getName().equals("java.lang.Object")) {
return 16;
}
}
}
break;
case -1053468136:
if (var1.equals("getCallbacks")) {
switch(var2.length) {
case 0:
return 7;
}
}
break;
case -124978608:
if (var1.equals("CGLIB$equals$2")) {
switch(var2.length) {
case 1:
if (var2[0].getName().equals("java.lang.Object")) {
return 11;
}
}
}
break;
case -60403779:
if (var1.equals("CGLIB$SET_STATIC_CALLBACKS")) {
switch(var2.length) {
case 1:
if (var2[0].getName().equals("[Lnet.sf.cglib.proxy.Callback;")) {
return 4;
}
}
}
break;
case -29025554:
if (var1.equals("CGLIB$hashCode$4")) {
switch(var2.length) {
case 0:
return 13;
}
}
break;
case 113643:
if (var1.equals("say")) {
switch(var2.length) {
case 0:
return 1;
}
}
break;
case 3522983:
if (var1.equals("say2")) {
switch(var2.length) {
case 0:
return 0;
}
}
break;
case 85179481:
if (var1.equals("CGLIB$SET_THREAD_CALLBACKS")) {
switch(var2.length) {
case 1:
if (var2[0].getName().equals("[Lnet.sf.cglib.proxy.Callback;")) {
return 5;
}
}
}
break;
case 94756189:
if (var1.equals("clone")) {
switch(var2.length) {
case 0:
return 19;
}
}
break;
case 147696667:
if (var1.equals("hashCode")) {
switch(var2.length) {
case 0:
return 18;
}
}
break;
case 161998109:
if (var1.equals("CGLIB$STATICHOOK1")) {
switch(var2.length) {
case 0:
return 8;
}
}
break;
case 495524492:
if (var1.equals("setCallbacks")) {
switch(var2.length) {
case 1:
if (var2[0].getName().equals("[Lnet.sf.cglib.proxy.Callback;")) {
return 3;
}
}
}
break;
case 511112950:
if (var1.equals("CGLIB$say2$0")) {
switch(var2.length) {
case 0:
return 9;
}
}
break;
case 1124865749:
if (var1.equals("CGLIB$say$1")) {
switch(var2.length) {
case 0:
return 10;
}
}
break;
case 1154623345:
if (var1.equals("CGLIB$findMethodProxy")) {
switch(var2.length) {
case 1:
if (var2[0].getName().equals("net.sf.cglib.core.Signature")) {
return 15;
}
}
}
break;
case 1154711791:
if (var1.equals("staticMethod")) {
switch(var2.length) {
case 0:
return 24;
}
}
break;
case 1543336190:
if (var1.equals("CGLIB$toString$3")) {
switch(var2.length) {
case 0:
return 12;
}
}
break;
case 1811874389:
if (var1.equals("newInstance")) {
switch(var2.length) {
case 1:
String var10001 = var2[0].getName();
switch(var10001.hashCode()) {
case -845341380:
if (var10001.equals("net.sf.cglib.proxy.Callback")) {
return 22;
}
break;
case 1730110032:
if (var10001.equals("[Lnet.sf.cglib.proxy.Callback;")) {
return 20;
}
}
case 2:
default:
break;
case 3:
if (var2[0].getName().equals("[Ljava.lang.Class;") && var2[1].getName().equals("[Ljava.lang.Object;") && var2[2].getName().equals("[Lnet.sf.cglib.proxy.Callback;")) {
return 21;
}
}
}
break;
case 1817099975:
if (var1.equals("setCallback")) {
switch(var2.length) {
case 2:
if (var2[0].getName().equals("int") && var2[1].getName().equals("net.sf.cglib.proxy.Callback")) {
return 2;
}
}
}
break;
case 1900285431:
if (var1.equals("finalMethod")) {
switch(var2.length) {
case 0:
return 23;
}
}
break;
case 1905679803:
if (var1.equals("getCallback")) {
switch(var2.length) {
case 1:
if (var2[0].getName().equals("int")) {
return 6;
}
}
}
break;
case 1951977611:
if (var1.equals("CGLIB$clone$5")) {
switch(var2.length) {
case 0:
return 14;
}
}
}
return -1;
}
public int getIndex(Class[] var1) {
switch(var1.length) {
case 0:
return 0;
default:
return -1;
}
}
public Object invoke(int var1, Object var2, Object[] var3) throws InvocationTargetException {
30794112 var10000 = (30794112)var2;
int var10001 = var1;
try {
switch(var10001) {
case 0:
var10000.say2();
return null;
case 1:
var10000.say();
return null;
case 2:
var10000.setCallback(((Number)var3[0]).intValue(), (Callback)var3[1]);
return null;
case 3:
var10000.setCallbacks((Callback[])var3[0]);
return null;
case 4:
30794112.CGLIB$SET_STATIC_CALLBACKS((Callback[])var3[0]);
return null;
case 5:
30794112.CGLIB$SET_THREAD_CALLBACKS((Callback[])var3[0]);
return null;
case 6:
return var10000.getCallback(((Number)var3[0]).intValue());
case 7:
return var10000.getCallbacks();
case 8:
30794112.CGLIB$STATICHOOK1();
return null;
case 9:
var10000.CGLIB$say2$0();
return null;
case 10:
var10000.CGLIB$say$1();
return null;
case 11:
return new Boolean(var10000.CGLIB$equals$2(var3[0]));
case 12:
return var10000.CGLIB$toString$3();
case 13:
return new Integer(var10000.CGLIB$hashCode$4());
case 14:
return var10000.CGLIB$clone$5();
case 15:
return 30794112.CGLIB$findMethodProxy((Signature)var3[0]);
case 16:
return new Boolean(var10000.equals(var3[0]));
case 17:
return var10000.toString();
case 18:
return new Integer(var10000.hashCode());
case 19:
return var10000.clone();
case 20:
return var10000.newInstance((Callback[])var3[0]);
case 21:
return var10000.newInstance((Class[])var3[0], (Object[])var3[1], (Callback[])var3[2]);
case 22:
return var10000.newInstance((Callback)var3[0]);
case 23:
var10000.finalMethod();
return null;
case 24:
UserServiceImpl.staticMethod();
return null;
}
} catch (Throwable var4) {
throw new InvocationTargetException(var4);
}
throw new IllegalArgumentException("Cannot find matching method/constructor");
}
public Object newInstance(int var1, Object[] var2) throws InvocationTargetException {
30794112 var10000 = new 30794112;
30794112 var10001 = var10000;
int var10002 = var1;
try {
switch(var10002) {
case 0:
var10001.();
return var10000;
}
} catch (Throwable var3) {
throw new InvocationTargetException(var3);
}
throw new IllegalArgumentException("Cannot find matching method/constructor");
}
public int getMaxIndex() {
return 24;
}
} 被代理类索引类（继承FastClass）
原理同上
public class UserServiceImpl$$FastClassByCGLIB$$667bfe0a extends FastClass {
public UserServiceImpl$$FastClassByCGLIB$$667bfe0a(Class var1) {
super(var1);
}
public int getIndex(Signature var1) {
String var10000 = var1.toString();
switch(var10000.hashCode()) {
case -909388886:
if (var10000.equals("say()V")) {
return 1;
}
break;
case -560613858:
if (var10000.equals("finalMethod()V")) {
return 2;
}
break;
case 1625931814:
if (var10000.equals("staticMethod()V")) {
return 3;
}
break;
case 1826985398:
if (var10000.equals("equals(Ljava/lang/Object;)Z")) {
return 4;
}
break;
case 1874011246:
if (var10000.equals("say2()V")) {
return 0;
}
break;
case 1913648695:
if (var10000.equals("toString()Ljava/lang/String;")) {
return 5;
}
break;
case 1984935277:
if (var10000.equals("hashCode()I")) {
return 6;
}
}
return -1;
}
public int getIndex(String var1, Class[] var2) {
switch(var1.hashCode()) {
case -1776922004:
if (var1.equals("toString")) {
switch(var2.length) {
case 0:
return 5;
}
}
break;
case -1295482945:
if (var1.equals("equals")) {
switch(var2.length) {
case 1:
if (var2[0].getName().equals("java.lang.Object")) {
return 4;
}
}
}
break;
case 113643:
if (var1.equals("say")) {
switch(var2.length) {
case 0:
return 1;
}
}
break;
case 3522983:
if (var1.equals("say2")) {
switch(var2.length) {
case 0:
return 0;
}
}
break;
case 147696667:
if (var1.equals("hashCode")) {
switch(var2.length) {
case 0:
return 6;
}
}
break;
case 1154711791:
if (var1.equals("staticMethod")) {
switch(var2.length) {
case 0:
return 3;
}
}
break;
case 1900285431:
if (var1.equals("finalMethod")) {
switch(var2.length) {
case 0:
return 2;
}
}
}
return -1;
}
public int getIndex(Class[] var1) {
switch(var1.length) {
case 0:
return 0;
default:
return -1;
}
}
public Object invoke(int var1, Object var2, Object[] var3) throws InvocationTargetException {
UserServiceImpl var10000 = (UserServiceImpl)var2;
int var10001 = var1;
try {
switch(var10001) {
case 0:
var10000.say2();
return null;
case 1:
var10000.say();
return null;
case 2:
var10000.finalMethod();
return null;
case 3:
UserServiceImpl.staticMethod();
return null;
case 4:
return new Boolean(var10000.equals(var3[0]));
case 5:
return var10000.toString();
case 6:
return new Integer(var10000.hashCode());
}
} catch (Throwable var4) {
throw new InvocationTargetException(var4);
}
throw new IllegalArgumentException("Cannot find matching method/constructor");
}
public Object newInstance(int var1, Object[] var2) throws InvocationTargetException {
UserServiceImpl var10000 = new UserServiceImpl;
UserServiceImpl var10001 = var10000;
int var10002 = var1;
try {
switch(var10002) {
case 0:
var10001.();
return var10000;
}
} catch (Throwable var3) {
throw new InvocationTargetException(var3);
}
throw new IllegalArgumentException("Cannot find matching method/constructor");
}
public int getMaxIndex() {
return 6;
}
} 代码跟踪
通过调用栈显示，
proxy.UserServiceImpl$EnhancerByCGLIB$30794112#say 内部调用了proxy.cglib.MyInterceptor#intercept ，intercept内部调用了net.sf.cglib.proxy.MethodProxy#invokeSuper，invokeSuper内部调用了proxy.UserServiceImpl$EnhancerByCGLIB$30794112$FastClassByCGLIB$5d581559#invoke，参数索引值是10。如下图二，索引10是代理类proxy.UserServiceImpl$EnhancerByCGLIB$30794112#CGLIB$say$0方法，CGLIB$say$0方法内部调用了super.say()父类（被代理类）方法。
Java动态代理和cglib比较
生成代理类技术不同
- java动态代理：jdk自带类ProxyGenerator生成class字节码
- cglib：通过ASM框架生成class字节码文件
生成代理类的方式不同
- java动态代理：代理类继承java.lang.reflect.Proxy，实现被代理类的接口
- cglib：代理类继承被代理类，实现net.sf.cglib.proxy.Factory
生成类数量不同
- java动态代理：生成一个proxy类
- cglib：生成一个proxy，两个fastclass类
调用方式不同
- java动态代理：代理类->InvocationHandler->反射调用被代理类方法
- cglib：代理类->MethodInterceptor->调用索引类invoke->直接调用被代理类方法
性能比较
网上找到比较多的说明如下：
在
jdk6之前比使用Java反射效率要高，在jdk6、jdk7、jdk8逐步对 JDK 动态代理优化之后，在调用次数较少的情况下，JDK 代理效率 高于 CGLIB 代理效率。只有当进行大量调用的时候，jdk6和jdk7比CGLIB代理效率低一点，但是到 jdk8 的时候，jdk 代理效率高于 CGLIB 代理，总之，每一次 jdk 版本升级，JDK 代理效率 都得到提升，而 CGLIB 代理效率 确有点跟不上步伐。