动态代理方案性能对比 (CGLIB,ASSIT,JDK)

动态代理工具比较成熟的产品有：
JDK自带的，ASM，CGLIB(基于ASM包装)，JAVAASSIST，
使用的版本分别为：
JDK-1.6.0_18-b07, ASM-3.3, CGLIB-2.2, JAVAASSIST-3.11.0.GA

(一) 测试结果：
数据为执行三次，每次调用一千万次代理方法的结果，测试代码后面有贴出。

(1) PC机测试结果：Linux 2.6.9-42.ELsmp(32bit), 2 Cores CPU(Intel Pentium4 3.06GHz)

Java代码

Create JDK Proxy: 13 ms
Create CGLIB Proxy: 217 ms
Create JAVAASSIST Proxy: 99 ms
Create JAVAASSIST Bytecode Proxy: 168 ms
Create ASM Proxy: 3 ms
================
Run JDK Proxy: 2224 ms, 634,022 t/s
Run CGLIB Proxy: 1123 ms, 1,255,623 t/s
Run JAVAASSIST Proxy: 3212 ms, 438,999 t/s
Run JAVAASSIST Bytecode Proxy: 206 ms, 6,844,977 t/s
Run ASM Bytecode Proxy: 209 ms, 6,746,724 t/s
----------------
Run JDK Proxy: 2169 ms, 650,099 t/s
Run CGLIB Proxy: 1059 ms, 1,331,506 t/s
Run JAVAASSIST Proxy: 3328 ms, 423,697 t/s
Run JAVAASSIST Bytecode Proxy: 202 ms, 6,980,521 t/s
Run ASM Bytecode Proxy: 206 ms, 6,844,977 t/s
----------------
Run JDK Proxy: 2174 ms, 648,604 t/s
Run CGLIB Proxy: 1032 ms, 1,366,342 t/s
Run JAVAASSIST Proxy: 3119 ms, 452,088 t/s
Run JAVAASSIST Bytecode Proxy: 207 ms, 6,811,910 t/s
Run ASM Bytecode Proxy: 207 ms, 6,811,910 t/s
----------------

(2) 服务器测试结果：Linux 2.6.18-128.el5xen(64bit), 16 Cores CPU(Intel Xeon E5520 2.27GHz)

Java代码

Create JDK Proxy: 7 ms
Create CGLIB Proxy: 86 ms
Create JAVAASSIST Proxy: 36 ms
Create JAVAASSIST Bytecode Proxy: 57 ms
Create ASM Proxy: 1 ms
================
Run JDK Proxy: 235 ms, 6,000,278 t/s
Run CGLIB Proxy: 234 ms, 6,025,920 t/s
Run JAVAASSIST Proxy: 459 ms, 3,072,037 t/s
Run JAVAASSIST Bytecode Proxy: 71 ms, 19,860,076 t/s
Run ASM Bytecode Proxy: 72 ms, 19,584,241 t/s
----------------
Run JDK Proxy: 298 ms, 4,731,763 t/s
Run CGLIB Proxy: 134 ms, 10,522,876 t/s
Run JAVAASSIST Proxy: 406 ms, 3,473,067 t/s
Run JAVAASSIST Bytecode Proxy: 67 ms, 21,045,752 t/s
Run ASM Bytecode Proxy: 66 ms, 21,364,627 t/s
----------------
Run JDK Proxy: 282 ms, 5,000,231 t/s
Run CGLIB Proxy: 133 ms, 10,601,995 t/s
Run JAVAASSIST Proxy: 406 ms, 3,473,067 t/s
Run JAVAASSIST Bytecode Proxy: 67 ms, 21,045,752 t/s
Run ASM Bytecode Proxy: 67 ms, 21,045,752 t/s
----------------

(二) 测试结论：
1. ASM和JAVAASSIST字节码生成方式不相上下，都很快，是CGLIB的5倍。
2. CGLIB次之，是JDK自带的两倍。
3. JDK自带的再次之，因JDK1.6对动态代理做了优化，如果用低版本JDK更慢，要注意的是JDK也是通过字节码生成来实现动态代理的，而不是反射。
4. JAVAASSIST提供者动态代理接口最慢，比JDK自带的还慢。
(这也是为什么网上有人说JAVAASSIST比JDK还慢的原因，用JAVAASSIST最好别用它提供的动态代理接口，而可以考虑用它的字节码生成方式)

(三) 差异原因：
各方案生成的字节码不一样，
像JDK和CGLIB都考虑了很多因素，以及继承或包装了自己的一些类，
所以生成的字节码非常大，而我们很多时候用不上这些，
而手工生成的字节码非常小，所以速度快，
具体的字节码对比，后面有贴出，可自行分析。

(四) 最终选型：
最终决定使用JAVAASSIST的字节码生成代理方式，
虽然ASM稍快，但并没有快一个数量级，
而JAVAASSIST的字节码生成方式比ASM方便，
JAVAASSIST只需用字符串拼接出Java源码，便可生成相应字节码，
而ASM需要手工写字节码。

(五) 测试代码：

Java代码

public interface CountService {

    int count();

}

Java代码

public class CountServiceImpl implements CountService {

    private int count = 0;

    public int count() {

        return count++;

    }

}

Java代码

import java.lang.reflect.Field;

import java.lang.reflect.InvocationHandler;

import java.lang.reflect.Method;

import java.lang.reflect.Proxy;

import java.text.DecimalFormat;

import javassist.ClassPool;

import javassist.CtClass;

import javassist.CtField;

import javassist.CtNewConstructor;

import javassist.CtNewMethod;

import javassist.util.proxy.MethodHandler;

import javassist.util.proxy.ProxyFactory;

import javassist.util.proxy.ProxyObject;

import net.sf.cglib.proxy.Enhancer;

import net.sf.cglib.proxy.MethodInterceptor;

import net.sf.cglib.proxy.MethodProxy;

import org.objectweb.asm.ClassWriter;

import org.objectweb.asm.FieldVisitor;

import org.objectweb.asm.MethodVisitor;

import org.objectweb.asm.Opcodes;

public class DynamicProxyPerformanceTest {

    public static void main(String[] args) throws Exception {

        CountService delegate = new CountServiceImpl();

        long time = System.currentTimeMillis();

        CountService jdkProxy = createJdkDynamicProxy(delegate);

        time = System.currentTimeMillis() - time;

        System.out.println("Create JDK Proxy: " + time + " ms");

        time = System.currentTimeMillis();

        CountService cglibProxy = createCglibDynamicProxy(delegate);

        time = System.currentTimeMillis() - time;

        System.out.println("Create CGLIB Proxy: " + time + " ms");

        time = System.currentTimeMillis();

        CountService javassistProxy = createJavassistDynamicProxy(delegate);

        time = System.currentTimeMillis() - time;

        System.out.println("Create JAVAASSIST Proxy: " + time + " ms");

        time = System.currentTimeMillis();

        CountService javassistBytecodeProxy = createJavassistBytecodeDynamicProxy(delegate);

        time = System.currentTimeMillis() - time;

        System.out.println("Create JAVAASSIST Bytecode Proxy: " + time + " ms");

        time = System.currentTimeMillis();

        CountService asmBytecodeProxy = createAsmBytecodeDynamicProxy(delegate);

        time = System.currentTimeMillis() - time;

        System.out.println("Create ASM Proxy: " + time + " ms");

        System.out.println("================");

        for (int i = 0; i < 3; i++) {

            test(jdkProxy, "Run JDK Proxy: ");

            test(cglibProxy, "Run CGLIB Proxy: ");

            test(javassistProxy, "Run JAVAASSIST Proxy: ");

            test(javassistBytecodeProxy, "Run JAVAASSIST Bytecode Proxy: ");

            test(asmBytecodeProxy, "Run ASM Bytecode Proxy: ");

            System.out.println("----------------");

        }

    }

    private static void test(CountService service, String label) throws Exception {

        service.count(); // warm up

        int count = 10000000;

        long time = System.currentTimeMillis();

        for (int i = 0; i < count; i++) {

            service.count();

        }

        time = System.currentTimeMillis() - time;

        System.out.println(label + time + " ms, " + new DecimalFormat().format(count * 1000 / time) + " t/s");

    }

    private static CountService createJdkDynamicProxy(final CountService delegate) {

        CountService jdkProxy = (CountService) Proxy.newProxyInstance(ClassLoader.getSystemClassLoader(), new Class[] { CountService.class }, new JdkHandler(

                delegate));

        return jdkProxy;

    }

    private static class JdkHandler implements InvocationHandler {

        final Object delegate;

        JdkHandler(Object delegate) {

            this.delegate = delegate;

        }

        public Object invoke(Object object, Method method, Object[] objects) throws Throwable {

            return method.invoke(delegate, objects);

        }

    }

    private static CountService createCglibDynamicProxy(final CountService delegate) throws Exception {

        Enhancer enhancer = new Enhancer();

        enhancer.setCallback(new CglibInterceptor(delegate));

        enhancer.setInterfaces(new Class[] { CountService.class });

        CountService cglibProxy = (CountService) enhancer.create();

        return cglibProxy;

    }

    private static class CglibInterceptor implements MethodInterceptor {

        final Object delegate;

        CglibInterceptor(Object delegate) {

            this.delegate = delegate;

        }

        public Object intercept(Object object, Method method, Object[] objects, MethodProxy methodProxy) throws Throwable {

            return methodProxy.invoke(delegate, objects);

        }

    }

    private static CountService createJavassistDynamicProxy(final CountService delegate) throws Exception {

        ProxyFactory proxyFactory = new ProxyFactory();

        proxyFactory.setInterfaces(new Class[] { CountService.class });

        Class<?> proxyClass = proxyFactory.createClass();

        CountService javassistProxy = (CountService) proxyClass.newInstance();

        ((ProxyObject) javassistProxy).setHandler(new JavaAssitInterceptor(delegate));

        return javassistProxy;

    }

    private static class JavaAssitInterceptor implements MethodHandler {

        final Object delegate;

        JavaAssitInterceptor(Object delegate) {

            this.delegate = delegate;

        }

        public Object invoke(Object self, Method m, Method proceed, Object[] args) throws Throwable {

            return m.invoke(delegate, args);

        }

    }

    private static CountService createJavassistBytecodeDynamicProxy(CountService delegate) throws Exception {

        ClassPool mPool = new ClassPool(true);

        CtClass mCtc = mPool.makeClass(CountService.class.getName() + "JavaassistProxy");

        mCtc.addInterface(mPool.get(CountService.class.getName()));

        mCtc.addConstructor(CtNewConstructor.defaultConstructor(mCtc));

        mCtc.addField(CtField.make("public " + CountService.class.getName() + " delegate;", mCtc));

        mCtc.addMethod(CtNewMethod.make("public int count() { return delegate.count(); }", mCtc));

        Class<?> pc = mCtc.toClass();

        CountService bytecodeProxy = (CountService) pc.newInstance();

        Field filed = bytecodeProxy.getClass().getField("delegate");

        filed.set(bytecodeProxy, delegate);

        return bytecodeProxy;

    }

    private static CountService createAsmBytecodeDynamicProxy(CountService delegate) throws Exception {

        ClassWriter classWriter = new ClassWriter(ClassWriter.COMPUTE_FRAMES | ClassWriter.COMPUTE_MAXS);

        String className = CountService.class.getName() + "AsmProxy";

        String classPath = className.replace('.', '/');

        String interfacePath = CountService.class.getName().replace('.', '/');

        classWriter.visit(Opcodes.V1_5, Opcodes.ACC_PUBLIC, classPath, null, "java/lang/Object", new String[] { interfacePath });

        MethodVisitor initVisitor = classWriter.visitMethod(Opcodes.ACC_PUBLIC, "<init>", "()V", null, null);

        initVisitor.visitCode();

        initVisitor.visitVarInsn(Opcodes.ALOAD, 0);

        initVisitor.visitMethodInsn(Opcodes.INVOKESPECIAL, "java/lang/Object", "<init>", "()V");

        initVisitor.visitInsn(Opcodes.RETURN);

        initVisitor.visitMaxs(0, 0);

        initVisitor.visitEnd();

        FieldVisitor fieldVisitor = classWriter.visitField(Opcodes.ACC_PUBLIC, "delegate", "L" + interfacePath + ";", null, null);

        fieldVisitor.visitEnd();

        MethodVisitor methodVisitor = classWriter.visitMethod(Opcodes.ACC_PUBLIC, "count", "()I", null, null);

        methodVisitor.visitCode();

        methodVisitor.visitVarInsn(Opcodes.ALOAD, 0);

        methodVisitor.visitFieldInsn(Opcodes.GETFIELD, classPath, "delegate", "L" + interfacePath + ";");

        methodVisitor.visitMethodInsn(Opcodes.INVOKEINTERFACE, interfacePath, "count", "()I");

        methodVisitor.visitInsn(Opcodes.IRETURN);

        methodVisitor.visitMaxs(0, 0);

        methodVisitor.visitEnd();

        classWriter.visitEnd();

        byte[] code = classWriter.toByteArray();

        CountService bytecodeProxy = (CountService) new ByteArrayClassLoader().getClass(className, code).newInstance();

        Field filed = bytecodeProxy.getClass().getField("delegate");

        filed.set(bytecodeProxy, delegate);

        return bytecodeProxy;

    }

    private static class ByteArrayClassLoader extends ClassLoader {

        public ByteArrayClassLoader() {

            super(ByteArrayClassLoader.class.getClassLoader());

        }

        public synchronized Class<?> getClass(String name, byte[] code) {

            if (name == null) {

                throw new IllegalArgumentException("");

            }

            return defineClass(name, code, 0, code.length);

        }

    }

}

(六) 字节码对比

(1) JDK生成的字节码：

Java代码

public final class $Proxy0 extends java.lang.reflect.Proxy implements com.alibaba.test.performance.dynamicproxy.CountService{

public $Proxy0(java.lang.reflect.InvocationHandler) throws ;

Code:

0: aload_0

1: aload_1

2: invokespecial #8; //Method java/lang/reflect/Proxy."":(Ljava/lang/reflect/InvocationHandler;)V

5: return

public final boolean equals(java.lang.Object) throws ;

Code:

0: aload_0

1: getfield #16; //Field java/lang/reflect/Proxy.h:Ljava/lang/reflect/InvocationHandler;

4: aload_0

5: getstatic #20; //Field m1:Ljava/lang/reflect/Method;

8: iconst_1

9: anewarray #22; //class java/lang/Object

12: dup

13: iconst_0

14: aload_1

15: aastore

16: invokeinterface #28, 4; //InterfaceMethod java/lang/reflect/InvocationHandler.invoke:(Ljava/lang/Object;Ljava/lang/reflect/Method;[Ljava/lang/Object;)Ljava/lang/Object;

21: checkcast #30; //class java/lang/Boolean

24: invokevirtual #34; //Method java/lang/Boolean.booleanValue:()Z

27: ireturn

28: athrow

29: astore_2

30: new #42; //class java/lang/reflect/UndeclaredThrowableException

33: dup

34: aload_2

35: invokespecial #45; //Method java/lang/reflect/UndeclaredThrowableException."":(Ljava/lang/Throwable;)V

38: athrow

Exception table:

from to target type

0 28 28 Class java/lang/Error

0 28 28 Class java/lang/RuntimeException

0 28 29 Class java/lang/Throwable

public final int count() throws ;

Code:

0: aload_0

1: getfield #16; //Field java/lang/reflect/Proxy.h:Ljava/lang/reflect/InvocationHandler;

4: aload_0

5: getstatic #50; //Field m3:Ljava/lang/reflect/Method;

8: aconst_null

9: invokeinterface #28, 4; //InterfaceMethod java/lang/reflect/InvocationHandler.invoke:(Ljava/lang/Object;Ljava/lang/reflect/Method;[Ljava/lang/Object;)Ljava/lang/Object;

14: checkcast #52; //class java/lang/Integer

17: invokevirtual #55; //Method java/lang/Integer.intValue:()I

20: ireturn

21: athrow

22: astore_1

23: new #42; //class java/lang/reflect/UndeclaredThrowableException

26: dup

27: aload_1

28: invokespecial #45; //Method java/lang/reflect/UndeclaredThrowableException."":(Ljava/lang/Throwable;)V

31: athrow

Exception table:

from to target type

0 21 21 Class java/lang/Error

0 21 21 Class java/lang/RuntimeException

0 21 22 Class java/lang/Throwable

public final int hashCode() throws ;

Code:

0: aload_0

1: getfield #16; //Field java/lang/reflect/Proxy.h:Ljava/lang/reflect/InvocationHandler;

4: aload_0

5: getstatic #59; //Field m0:Ljava/lang/reflect/Method;

8: aconst_null

9: invokeinterface #28, 4; //InterfaceMethod java/lang/reflect/InvocationHandler.invoke:(Ljava/lang/Object;Ljava/lang/reflect/Method;[Ljava/lang/Object;)Ljava/lang/Object;

14: checkcast #52; //class java/lang/Integer

17: invokevirtual #55; //Method java/lang/Integer.intValue:()I

20: ireturn

21: athrow

22: astore_1

23: new #42; //class java/lang/reflect/UndeclaredThrowableException

26: dup

27: aload_1

28: invokespecial #45; //Method java/lang/reflect/UndeclaredThrowableException."":(Ljava/lang/Throwable;)V

31: athrow

Exception table:

from to target type

0 21 21 Class java/lang/Error

0 21 21 Class java/lang/RuntimeException

0 21 22 Class java/lang/Throwable

public final java.lang.String toString() throws ;

Code:

0: aload_0

1: getfield #16; //Field java/lang/reflect/Proxy.h:Ljava/lang/reflect/InvocationHandler;

4: aload_0

5: getstatic #64; //Field m2:Ljava/lang/reflect/Method;

8: aconst_null

9: invokeinterface #28, 4; //InterfaceMethod java/lang/reflect/InvocationHandler.invoke:(Ljava/lang/Object;Ljava/lang/reflect/Method;[Ljava/lang/Object;)Ljava/lang/Object;

14: checkcast #66; //class java/lang/String

17: areturn

18: athrow

19: astore_1

20: new #42; //class java/lang/reflect/UndeclaredThrowableException

23: dup

24: aload_1

25: invokespecial #45; //Method java/lang/reflect/UndeclaredThrowableException."":(Ljava/lang/Throwable;)V

28: athrow

Exception table:

from to target type

0 18 18 Class java/lang/Error

0 18 18 Class java/lang/RuntimeException

0 18 19 Class java/lang/Throwable

static {} throws ;

Code:

0: ldc #70; //String java.lang.Object

2: invokestatic #76; //Method java/lang/Class.forName:(Ljava/lang/String;)Ljava/lang/Class;

5: ldc #77; //String equals

7: iconst_1

8: anewarray #72; //class java/lang/Class

11: dup

12: iconst_0

13: ldc #70; //String java.lang.Object

15: invokestatic #76; //Method java/lang/Class.forName:(Ljava/lang/String;)Ljava/lang/Class;

18: aastore

19: invokevirtual #81; //Method java/lang/Class.getMethod:(Ljava/lang/String;[Ljava/lang/Class;)Ljava/lang/reflect/Method;

22: putstatic #20; //Field m1:Ljava/lang/reflect/Method;

25: ldc #83; //String com.alibaba.test.performance.dynamicproxy.CountService

27: invokestatic #76; //Method java/lang/Class.forName:(Ljava/lang/String;)Ljava/lang/Class;

30: ldc #84; //String count

32: iconst_0

33: anewarray #72; //class java/lang/Class

36: invokevirtual #81; //Method java/lang/Class.getMethod:(Ljava/lang/String;[Ljava/lang/Class;)Ljava/lang/reflect/Method;

39: putstatic #50; //Field m3:Ljava/lang/reflect/Method;

42: ldc #70; //String java.lang.Object

44: invokestatic #76; //Method java/lang/Class.forName:(Ljava/lang/String;)Ljava/lang/Class;

47: ldc #85; //String hashCode

49: iconst_0

50: anewarray #72; //class java/lang/Class

53: invokevirtual #81; //Method java/lang/Class.getMethod:(Ljava/lang/String;[Ljava/lang/Class;)Ljava/lang/reflect/Method;

56: putstatic #59; //Field m0:Ljava/lang/reflect/Method;

59: ldc #70; //String java.lang.Object

61: invokestatic #76; //Method java/lang/Class.forName:(Ljava/lang/String;)Ljava/lang/Class;

64: ldc #86; //String toString

66: iconst_0

67: anewarray #72; //class java/lang/Class

70: invokevirtual #81; //Method java/lang/Class.getMethod:(Ljava/lang/String;[Ljava/lang/Class;)Ljava/lang/reflect/Method;

73: putstatic #64; //Field m2:Ljava/lang/reflect/Method;

76: return

77: astore_1

78: new #90; //class java/lang/NoSuchMethodError

81: dup

82: aload_1

83: invokevirtual #93; //Method java/lang/Throwable.getMessage:()Ljava/lang/String;

86: invokespecial #96; //Method java/lang/NoSuchMethodError."":(Ljava/lang/String;)V

89: athrow

90: astore_1

91: new #100; //class java/lang/NoClassDefFoundError

94: dup

95: aload_1

96: invokevirtual #93; //Method java/lang/Throwable.getMessage:()Ljava/lang/String;

99: invokespecial #101; //Method java/lang/NoClassDefFoundError."":(Ljava/lang/String;)V

102: athrow

Exception table:

from to target type

0 77 77 Class java/lang/NoSuchMethodException

0 77 90 Class java/lang/ClassNotFoundException

}

(2) CGLIB生成的字节码：

Java代码

public class net.sf.cglib.core.MethodWrapper$MethodWrapperKey$$KeyFactoryByCGLIB$$d45e49f7 extends net.sf.cglib.core.KeyFactory implements net.sf.cglib.core.MethodWrapper$MethodWrapperKey{

public net.sf.cglib.core.MethodWrapper$MethodWrapperKey$$KeyFactoryByCGLIB$$d45e49f7();

Code:

0: aload_0

1: invokespecial #11; //Method net/sf/cglib/core/KeyFactory."":()V

4: return

public java.lang.Object newInstance(java.lang.String, java.lang.String[], java.lang.String);

Code:

0: new #2; //class net/sf/cglib/core/MethodWrapper$MethodWrapperKey$$KeyFactoryByCGLIB$$d45e49f7

3: dup

4: aload_1

5: aload_2

6: aload_3

7: invokespecial #16; //Method "":(Ljava/lang/String;[Ljava/lang/String;Ljava/lang/String;)V

10: areturn

public net.sf.cglib.core.MethodWrapper$MethodWrapperKey$$KeyFactoryByCGLIB$$d45e49f7(java.lang.String, java.lang.String[], java.lang.String);

Code:

0: aload_0

1: invokespecial #11; //Method net/sf/cglib/core/KeyFactory."":()V

4: aload_0

5: dup

6: aload_1

7: putfield #20; //Field FIELD_0:Ljava/lang/String;

10: dup

11: aload_2

12: putfield #24; //Field FIELD_1:[Ljava/lang/String;

15: dup

16: aload_3

17: putfield #27; //Field FIELD_2:Ljava/lang/String;

20: return

public int hashCode();

Code:

0: ldc #30; //int 938313161

2: aload_0

3: getfield #20; //Field FIELD_0:Ljava/lang/String;

6: swap

7: ldc #31; //int 362693231

9: imul

10: swap

11: dup

12: ifnull 21

15: invokevirtual #35; //Method java/lang/Object.hashCode:()I

18: goto 23

21: pop

22: iconst_0

23: iadd

24: aload_0

25: getfield #24; //Field FIELD_1:[Ljava/lang/String;

28: dup

29: ifnull 71

32: astore_1

33: iconst_0

34: istore_2

35: goto 62

38: aload_1

39: iload_2

40: aaload

41: swap

42: ldc #31; //int 362693231

44: imul

45: swap

46: dup

47: ifnull 56

50: invokevirtual #35; //Method java/lang/Object.hashCode:()I

53: goto 58

56: pop

57: iconst_0

58: iadd

59: iinc 2, 1

62: iload_2

63: aload_1

64: arraylength

65: if_icmplt 38

68: goto 72

71: pop

72: aload_0

73: getfield #27; //Field FIELD_2:Ljava/lang/String;

76: swap

77: ldc #31; //int 362693231

79: imul

80: swap

81: dup

82: ifnull 91

85: invokevirtual #35; //Method java/lang/Object.hashCode:()I

88: goto 93

91: pop

92: iconst_0

93: iadd

94: ireturn

public boolean equals(java.lang.Object);

Code:

0: aload_1

1: instanceof #2; //class net/sf/cglib/core/MethodWrapper$MethodWrapperKey$$KeyFactoryByCGLIB$$d45e49f7

4: ifeq 181

7: aload_0

8: getfield #20; //Field FIELD_0:Ljava/lang/String;

11: aload_1

12: checkcast #2; //class net/sf/cglib/core/MethodWrapper$MethodWrapperKey$$KeyFactoryByCGLIB$$d45e49f7

15: getfield #20; //Field FIELD_0:Ljava/lang/String;

18: dup2

19: ifnonnull 29

22: ifnonnull 35

25: pop2

26: goto 45

29: ifnull 35

32: goto 39

35: pop2

36: goto 181

39: invokevirtual #39; //Method java/lang/Object.equals:(Ljava/lang/Object;)Z

42: ifeq 181

45: aload_0

46: getfield #24; //Field FIELD_1:[Ljava/lang/String;

49: aload_1

50: checkcast #2; //class net/sf/cglib/core/MethodWrapper$MethodWrapperKey$$KeyFactoryByCGLIB$$d45e49f7

53: getfield #24; //Field FIELD_1:[Ljava/lang/String;

56: dup2

57: ifnonnull 67

60: ifnonnull 73

63: pop2

64: goto 141

67: ifnull 73

70: goto 77

73: pop2

74: goto 181

77: dup2

78: arraylength

79: swap

80: arraylength

81: if_icmpeq 88

84: pop2

85: goto 181

88: astore_2

89: astore_3

90: iconst_0

91: istore 4

93: goto 134

96: aload_2

97: iload 4

99: aaload

100: aload_3

101: iload 4

103: aaload

104: dup2

105: ifnonnull 115

108: ifnonnull 121

111: pop2

112: goto 131

115: ifnull 121

118: goto 125

121: pop2

122: goto 181

125: invokevirtual #39; //Method java/lang/Object.equals:(Ljava/lang/Object;)Z

128: ifeq 181

131: iinc 4, 1

134: iload 4

136: aload_2

137: arraylength

138: if_icmplt 96

141: aload_0

142: getfield #27; //Field FIELD_2:Ljava/lang/String;

145: aload_1

146: checkcast #2; //class net/sf/cglib/core/MethodWrapper$MethodWrapperKey$$KeyFactoryByCGLIB$$d45e49f7

149: getfield #27; //Field FIELD_2:Ljava/lang/String;

152: dup2

153: ifnonnull 163

156: ifnonnull 169

159: pop2

160: goto 179

163: ifnull 169

166: goto 173

169: pop2

170: goto 181

173: invokevirtual #39; //Method java/lang/Object.equals:(Ljava/lang/Object;)Z

176: ifeq 181

179: iconst_1

180: ireturn

181: iconst_0

182: ireturn

public java.lang.String toString();

Code:

0: new #43; //class java/lang/StringBuffer

3: dup

4: invokespecial #44; //Method java/lang/StringBuffer."":()V

7: aload_0

8: getfield #20; //Field FIELD_0:Ljava/lang/String;

11: dup

12: ifnull 24

15: invokevirtual #46; //Method java/lang/Object.toString:()Ljava/lang/String;

18: invokevirtual #50; //Method java/lang/StringBuffer.append:(Ljava/lang/String;)Ljava/lang/StringBuffer;

21: goto 30

24: pop

25: ldc #52; //String null

27: invokevirtual #50; //Method java/lang/StringBuffer.append:(Ljava/lang/String;)Ljava/lang/StringBuffer;

30: ldc #54; //String ,

32: invokevirtual #50; //Method java/lang/StringBuffer.append:(Ljava/lang/String;)Ljava/lang/StringBuffer;

35: aload_0

36: getfield #24; //Field FIELD_1:[Ljava/lang/String;

39: dup

40: ifnull 110

43: swap

44: ldc #56; //String {

46: invokevirtual #50; //Method java/lang/StringBuffer.append:(Ljava/lang/String;)Ljava/lang/StringBuffer;

49: swap

50: astore_1

51: iconst_0

52: istore_2

53: goto 86

56: aload_1

57: iload_2

58: aaload

59: dup

60: ifnull 72

63: invokevirtual #46; //Method java/lang/Object.toString:()Ljava/lang/String;

66: invokevirtual #50; //Method java/lang/StringBuffer.append:(Ljava/lang/String;)Ljava/lang/StringBuffer;

69: goto 78

72: pop

73: ldc #52; //String null

75: invokevirtual #50; //Method java/lang/StringBuffer.append:(Ljava/lang/String;)Ljava/lang/StringBuffer;

78: ldc #54; //String ,

80: invokevirtual #50; //Method java/lang/StringBuffer.append:(Ljava/lang/String;)Ljava/lang/StringBuffer;

83: iinc 2, 1

86: iload_2

87: aload_1

88: arraylength

89: if_icmplt 56

92: dup

93: dup

94: invokevirtual #59; //Method java/lang/StringBuffer.length:()I

97: iconst_2

98: isub

99: invokevirtual #63; //Method java/lang/StringBuffer.setLength:(I)V

102: ldc #65; //String }

104: invokevirtual #50; //Method java/lang/StringBuffer.append:(Ljava/lang/String;)Ljava/lang/StringBuffer;

107: goto 116

110: pop

111: ldc #52; //String null

113: invokevirtual #50; //Method java/lang/StringBuffer.append:(Ljava/lang/String;)Ljava/lang/StringBuffer;

116: ldc #54; //String ,

118: invokevirtual #50; //Method java/lang/StringBuffer.append:(Ljava/lang/String;)Ljava/lang/StringBuffer;

121: aload_0

122: getfield #27; //Field FIELD_2:Ljava/lang/String;

125: dup

126: ifnull 138

129: invokevirtual #46; //Method java/lang/Object.toString:()Ljava/lang/String;

132: invokevirtual #50; //Method java/lang/StringBuffer.append:(Ljava/lang/String;)Ljava/lang/StringBuffer;

135: goto 144

138: pop

139: ldc #52; //String null

141: invokevirtual #50; //Method java/lang/StringBuffer.append:(Ljava/lang/String;)Ljava/lang/StringBuffer;

144: invokevirtual #66; //Method java/lang/StringBuffer.toString:()Ljava/lang/String;

147: areturn

}

(3) JAVAASSIST动态代理接口生成的字节码：

Java代码

public class com.alibaba.test.performance.dynamicproxy.CountService_$$_javassist_0 extends java.lang.Object implements com.alibaba.test.performance.dynamicproxy.CountService,javassist.util.proxy.ProxyObject{

public static javassist.util.proxy.MethodHandler default_interceptor;

public static javassist.util.proxy.MethodFilter _method_filter;

public com.alibaba.test.performance.dynamicproxy.CountService_$$_javassist_0();

Code:

0: aload_0

1: getstatic #19; //Field default_interceptor:Ljavassist/util/proxy/MethodHandler;

4: putfield #21; //Field handler:Ljavassist/util/proxy/MethodHandler;

7: getstatic #23; //Field default_interceptor:Ljavassist/util/proxy/MethodHandler;

10: ifnonnull 20

13: aload_0

14: getstatic #27; //Field javassist/util/proxy/RuntimeSupport.default_interceptor:Ljavassist/util/proxy/MethodHandler;

17: putfield #29; //Field handler:Ljavassist/util/proxy/MethodHandler;

20: aload_0

21: invokespecial #31; //Method java/lang/Object."":()V

24: return

public final boolean _d0equals(java.lang.Object);

Code:

0: aload_0

1: aload_1

2: invokespecial #38; //Method java/lang/Object.equals:(Ljava/lang/Object;)Z

5: ireturn

public final boolean equals(java.lang.Object);

Code:

0: getstatic #42; //Field _methods_:[Ljava/lang/reflect/Method;

3: astore_2

4: aload_0

5: ldc #43; //String equals

7: ldc #44; //String _d0equals

9: iconst_0

10: ldc #45; //String (Ljava/lang/Object;)Z

12: aload_2

13: invokestatic #49; //Method javassist/util/proxy/RuntimeSupport.find2Methods:(Ljava/lang/Object;Ljava/lang/String;Ljava/lang/String;ILjava/lang/String;[Ljava/lang/reflect/Method;)V

16: aload_0

17: getfield #51; //Field handler:Ljavassist/util/proxy/MethodHandler;

20: aload_0

21: aload_2

22: iconst_0

23: aaload

24: aload_2

25: iconst_1

26: aaload

27: iconst_1

28: anewarray #52; //class java/lang/Object

31: dup

32: iconst_0

33: aload_1

34: aastore

35: invokeinterface #58, 5; //InterfaceMethod javassist/util/proxy/MethodHandler.invoke:(Ljava/lang/Object;Ljava/lang/reflect/Method;Ljava/lang/reflect/Method;[Ljava/lang/Object;)Ljava/lang/Object;

40: checkcast #60; //class java/lang/Boolean

43: invokevirtual #64; //Method java/lang/Boolean.booleanValue:()Z

46: ireturn

public final java.lang.Object _d1clone() throws java.lang.CloneNotSupportedException;

Code:

0: aload_0

1: invokespecial #72; //Method java/lang/Object.clone:()Ljava/lang/Object;

4: areturn

protected final java.lang.Object clone() throws java.lang.CloneNotSupportedException;

Code:

0: getstatic #74; //Field _methods_:[Ljava/lang/reflect/Method;

3: astore_1

4: aload_0

5: ldc #75; //String clone

7: ldc #76; //String _d1clone

9: iconst_2

10: ldc #77; //String ()Ljava/lang/Object;

12: aload_1

13: invokestatic #79; //Method javassist/util/proxy/RuntimeSupport.find2Methods:(Ljava/lang/Object;Ljava/lang/String;Ljava/lang/String;ILjava/lang/String;[Ljava/lang/reflect/Method;)V

16: aload_0

17: getfield #81; //Field handler:Ljavassist/util/proxy/MethodHandler;

20: aload_0

21: aload_1

22: iconst_2

23: aaload

24: aload_1

25: iconst_3

26: aaload

27: iconst_0

28: anewarray #52; //class java/lang/Object

31: invokeinterface #83, 5; //InterfaceMethod javassist/util/proxy/MethodHandler.invoke:(Ljava/lang/Object;Ljava/lang/reflect/Method;Ljava/lang/reflect/Method;[Ljava/lang/Object;)Ljava/lang/Object;

36: checkcast #4; //class java/lang/Object

39: areturn

public final int _d2hashCode();

Code:

0: aload_0

1: invokespecial #88; //Method java/lang/Object.hashCode:()I

4: ireturn

public final int hashCode();

Code:

0: getstatic #90; //Field _methods_:[Ljava/lang/reflect/Method;

3: astore_1

4: aload_0

5: ldc #91; //String hashCode

7: ldc #92; //String _d2hashCode

9: iconst_4

10: ldc #93; //String ()I

12: aload_1

13: invokestatic #95; //Method javassist/util/proxy/RuntimeSupport.find2Methods:(Ljava/lang/Object;Ljava/lang/String;Ljava/lang/String;ILjava/lang/String;[Ljava/lang/reflect/Method;)V

16: aload_0

17: getfield #97; //Field handler:Ljavassist/util/proxy/MethodHandler;

20: aload_0

21: aload_1

22: iconst_4

23: aaload

24: aload_1

25: iconst_5

26: aaload

27: iconst_0

28: anewarray #52; //class java/lang/Object

31: invokeinterface #99, 5; //InterfaceMethod javassist/util/proxy/MethodHandler.invoke:(Ljava/lang/Object;Ljava/lang/reflect/Method;Ljava/lang/reflect/Method;[Ljava/lang/Object;)Ljava/lang/Object;

36: checkcast #101; //class java/lang/Integer

39: invokevirtual #104; //Method java/lang/Integer.intValue:()I

42: ireturn

public final int count();

Code:

0: getstatic #107; //Field _methods_:[Ljava/lang/reflect/Method;

3: astore_1

4: aload_0

5: ldc #108; //String count

7: aconst_null

8: bipush 6

10: ldc #109; //String ()I

12: aload_1

13: invokestatic #111; //Method javassist/util/proxy/RuntimeSupport.find2Methods:(Ljava/lang/Object;Ljava/lang/String;Ljava/lang/String;ILjava/lang/String;[Ljava/lang/reflect/Method;)V

16: aload_0

17: getfield #113; //Field handler:Ljavassist/util/proxy/MethodHandler;

20: aload_0

21: aload_1

22: bipush 6

24: aaload

25: aload_1

26: bipush 7

28: aaload

29: iconst_0

30: anewarray #52; //class java/lang/Object

33: invokeinterface #115, 5; //InterfaceMethod javassist/util/proxy/MethodHandler.invoke:(Ljava/lang/Object;Ljava/lang/reflect/Method;Ljava/lang/reflect/Method;[Ljava/lang/Object;)Ljava/lang/Object;

38: checkcast #101; //class java/lang/Integer

41: invokevirtual #117; //Method java/lang/Integer.intValue:()I

44: ireturn

public final void _d4finalize() throws java.lang.Throwable;

Code:

0: aload_0

1: invokespecial #123; //Method java/lang/Object.finalize:()V

4: return

protected final void finalize() throws java.lang.Throwable;

Code:

0: getstatic #125; //Field _methods_:[Ljava/lang/reflect/Method;

3: astore_1

4: aload_0

5: ldc #126; //String finalize

7: ldc #127; //String _d4finalize

9: bipush 8

11: ldc #128; //String ()V

13: aload_1

14: invokestatic #130; //Method javassist/util/proxy/RuntimeSupport.find2Methods:(Ljava/lang/Object;Ljava/lang/String;Ljava/lang/String;ILjava/lang/String;[Ljava/lang/reflect/Method;)V

17: aload_0

18: getfield #132; //Field handler:Ljavassist/util/proxy/MethodHandler;

21: aload_0

22: aload_1

23: bipush 8

25: aaload

26: aload_1

27: bipush 9

29: aaload

30: iconst_0

31: anewarray #52; //class java/lang/Object

34: invokeinterface #134, 5; //InterfaceMethod javassist/util/proxy/MethodHandler.invoke:(Ljava/lang/Object;Ljava/lang/reflect/Method;Ljava/lang/reflect/Method;[Ljava/lang/Object;)Ljava/lang/Object;

39: pop

40: return

public final java.lang.String _d5toString();

Code:

0: aload_0

1: invokespecial #139; //Method java/lang/Object.toString:()Ljava/lang/String;

4: areturn

public final java.lang.String toString();

Code:

0: getstatic #141; //Field _methods_:[Ljava/lang/reflect/Method;

3: astore_1

4: aload_0

5: ldc #142; //String toString

7: ldc #143; //String _d5toString

9: bipush 10

11: ldc #144; //String ()Ljava/lang/String;

13: aload_1

14: invokestatic #146; //Method javassist/util/proxy/RuntimeSupport.find2Methods:(Ljava/lang/Object;Ljava/lang/String;Ljava/lang/String;ILjava/lang/String;[Ljava/lang/reflect/Method;)V

17: aload_0

18: getfield #148; //Field handler:Ljavassist/util/proxy/MethodHandler;

21: aload_0

22: aload_1

23: bipush 10

25: aaload

26: aload_1

27: bipush 11

29: aaload

30: iconst_0

31: anewarray #52; //class java/lang/Object

34: invokeinterface #150, 5; //InterfaceMethod javassist/util/proxy/MethodHandler.invoke:(Ljava/lang/Object;Ljava/lang/reflect/Method;Ljava/lang/reflect/Method;[Ljava/lang/Object;)Ljava/lang/Object;

39: checkcast #152; //class java/lang/String

42: areturn

static {};

Code:

0: bipush 12

2: anewarray #155; //class java/lang/reflect/Method

5: putstatic #157; //Field _methods_:[Ljava/lang/reflect/Method;

8: return

public void setHandler(javassist.util.proxy.MethodHandler);

Code:

0: aload_0

1: aload_1

2: putfield #161; //Field handler:Ljavassist/util/proxy/MethodHandler;

5: return

java.lang.Object writeReplace() throws java.io.ObjectStreamException;

Code:

0: aload_0

1: invokestatic #168; //Method javassist/util/proxy/RuntimeSupport.makeSerializedProxy:(Ljava/lang/Object;)Ljavassist/util/proxy/SerializedProxy;

4: areturn

}

(5) JAVAASSIST拼接源码生成的字节码：

Java代码

public class com.alibaba.test.performance.dynamicproxy.CountServiceJavaassistProxy extends java.lang.Object implements com.alibaba.test.performance.dynamicproxy.CountService{

public com.alibaba.test.performance.dynamicproxy.CountService delegate;

public com.alibaba.test.performance.dynamicproxy.CountServiceJavaassistProxy();

Code:

0: aload_0

1: invokespecial #12; //Method java/lang/Object."":()V

4: return

public int count();

Code:

0: aload_0

1: getfield #19; //Field delegate:Lcom/alibaba/test/performance/dynamicproxy/CountService;

4: invokeinterface #21, 1; //InterfaceMethod com/alibaba/test/performance/dynamicproxy/CountService.count:()I

9: ireturn

}

(6) 用ASM自行生成的字节码：

Java代码

public class com.alibaba.test.performance.dynamicproxy.CountServiceAsmProxy extends java.lang.Object implements com.alibaba.test.performance.dynamicproxy.CountService{

public com.alibaba.test.performance.dynamicproxy.CountService delegate;

public com.alibaba.test.performance.dynamicproxy.CountServiceAsmProxy();

Code:

0: aload_0

1: invokespecial #10; //Method java/lang/Object."":()V

4: return

public int count();

Code:

0: aload_0

1: getfield #16; //Field delegate:Lcom/alibaba/test/performance/dynamicproxy/CountService;

4: invokeinterface #18, 1; //InterfaceMethod com/alibaba/test/performance/dynamicproxy/CountService.count:()I

9: ireturn

}

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