Spring中JDK动态代理和CGLIB动态代理的性能比较

有空自己也做个实验,急于得到结论就先留个参考;
转自 http://budairenqin.iteye.com/blog/1500366
我们知道,service由于要做事务的包装,需要创建代理对象,spring中使用JDK动态代理或者CGLIB动态代理来创建代理对象,据说JDK动态代理创建对象的时间快于CGLIB,但是性能比CGLIB差(接下来我会测试这个观点),所以我得出以下结论:
1.spring在bean的scope为prototype的情况下,因为是延迟实例化bean,所以最好使用JDK的API创建代理对象;
2.反之对于singleton对象,spring默认是容器启动时就初始化bean,最好使用CGLIB来创建对象

把service配置成singleton我觉得性能方面显然要更好些,如果非要将request穿透到service层,是不是可以考虑用ThreadLocal?

在测试之前,我们先确定spring是以什么方式使用JDK动态代理和CGLIB的,如图:
JDK动态代理:
点击查看原始大小图片


CGLIB动态代理:
点击查看原始大小图片

接下来对测试下JDK动态代理和CGLIB动态代理的性能(CGLIB测试代码也和spring一样使用MethodInterceptor)

先贴上测试代码
Java代码  收藏代码
public interface CountService { 
    int count(); 


Java代码  收藏代码
public class CountServiceImpl implements CountService { 
    private int count = 0; 
     
    public int count() { 
        return ++count; 
    } 


Java代码  收藏代码
import java.io.File; 
import java.io.FileNotFoundException; 
import java.io.FileOutputStream; 
import java.io.IOException; 
import java.lang.reflect.InvocationHandler; 
import java.lang.reflect.Method; 
import java.lang.reflect.Proxy; 
import java.text.DecimalFormat; 
 
import net.sf.cglib.core.DefaultGeneratorStrategy; 
import net.sf.cglib.proxy.Enhancer; 
import net.sf.cglib.proxy.MethodInterceptor; 
import net.sf.cglib.proxy.MethodProxy; 
 
@SuppressWarnings("unused") 
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"); 
         
        for (int i = 0; i < 3; i++) { 
            test(jdkProxy, "Run JDK Proxy: "); 
            test(cglibProxy, "Run CGLIB 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)); 
         
        // 反汇编字节码用,测试的时候注释掉这段代码,不然影响测试结果 
        // 下面一行代码参照java.lang.reflect.Proxy 
//        byte[] proxyClassFile = 
//                sun.misc.ProxyGenerator.generateProxyClass( 
//                        jdkProxy.getClass().getName(), jdkProxy.getClass().getInterfaces()); 
//        try { 
//            FileOutputStream fos = 
//                    new FileOutputStream(new File(jdkProxy.getClass().getName() + ".class")); 
//            fos.write(proxyClassFile, 0, proxyClassFile.length); 
//        } catch (FileNotFoundException e) { 
//            e.printStackTrace(); 
//        } catch (IOException e) { 
//            e.printStackTrace(); 
//        } 
        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.setSuperclass(CountServiceImpl.class); 
        enhancer.setCallback(new MethodInterceptor() { 
            @Override 
            public Object intercept(Object obj, Method method, Object[] args, MethodProxy proxy) throws Throwable { 
                return proxy.invokeSuper(obj, args); 
            } 
        }); 
        CountServiceImpl cglibProxy = (CountServiceImpl) enhancer.create(); 
        // 反汇编字节码用,测试的时候注释掉这段代码,不然影响测试结果 
        // 下面一行代码参照net.sf.cglib.core.AbstractClassGenerator类中byte[] b = strategy.generate(this); 
//        byte[] proxyClassFile = new DefaultGeneratorStrategy().generate(enhancer); 
//        try { 
//            FileOutputStream fos = 
//                    new FileOutputStream(new File(cglibProxy.getClass().getName() + ".class")); 
//            fos.write(proxyClassFile, 0, proxyClassFile.length); 
//        } catch (FileNotFoundException e) { 
//            e.printStackTrace(); 
//        } catch (IOException e) { 
//            e.printStackTrace(); 
//        } 
        return cglibProxy; 
    } 



数据为执行三次,每次调用一千万次代理方法的结果
测试环境1:
JDK:fastdebug1.6
CGLIB:和spring2.0.6 使用同样的cglib-nodep-2.1_3.jar
CPU:P8400 2.53GHz 2.53GHz
测试结果1:
Java代码  收藏代码
Create JDK Proxy: 13 ms 
Create CGLIB Proxy: 201 ms 
Run JDK Proxy: 1571 ms, 897,559 t/s 
Run CGLIB Proxy: 824 ms, 1,711,244 t/s 
------------------- 
Run JDK Proxy: 1519 ms, 928,285 t/s 
Run CGLIB Proxy: 576 ms, 2,448,030 t/s 
------------------- 
Run JDK Proxy: 1546 ms, 912,073 t/s 
Run CGLIB Proxy: 590 ms, 2,389,941 t/s 
------------------- 

CGLIB创建代理对象速度大概比JDK Proxy慢15倍,执行速度是JDK Proxy的2倍左右

测试环境2:
JDK:fastdebug1.7
CGLIB:和spring2.0.6 使用同样的cglib-nodep-2.1_3.jar
CPU:P8400 2.53GHz 2.53GHz
测试结果2:
Java代码  收藏代码
Create JDK Proxy: 14 ms 
Create CGLIB Proxy: 204 ms 
Run JDK Proxy: 1608 ms, 876,906 t/s 
Run CGLIB Proxy: 529 ms, 2,665,530 t/s 
------------------- 
Run JDK Proxy: 1591 ms, 886,276 t/s 
Run CGLIB Proxy: 405 ms, 3,481,642 t/s 
------------------- 
Run JDK Proxy: 1624 ms, 868,266 t/s 
Run CGLIB Proxy: 405 ms, 3,481,642 t/s 
------------------- 

CGLIB创建代理对象速度大概比JDK Proxy慢15倍,执行速度是JDK Proxy的4倍左右

测试环境3:
JDK:jdk1.6.0_21
CGLIB:和spring2.0.6 使用同样的cglib-nodep-2.1_3.jar
CPU:P8400 2.53GHz 2.53GHz
测试结果3:
Java代码  收藏代码
Create JDK Proxy: 8 ms 
Create CGLIB Proxy: 99 ms 
Run JDK Proxy: 911 ms, 1,547,821 t/s 
Run CGLIB Proxy: 435 ms, 3,241,529 t/s 
------------------- 
Run JDK Proxy: 870 ms, 1,620,764 t/s 
Run CGLIB Proxy: 399 ms, 3,533,998 t/s 
------------------- 
Run JDK Proxy: 894 ms, 1,577,254 t/s 
Run CGLIB Proxy: 404 ms, 3,490,260 t/s 
------------------- 

CGLIB创建代理对象速度大概比JDK Proxy慢10倍以上,执行速度是JDK Proxy的2倍左右

测试环境4:
JDK:jdk1.7.0_02
CGLIB:和spring2.0.6 使用同样的cglib-nodep-2.1_3.jar
CPU:P8400 2.53GHz 2.53GHz
测试结果4:
Java代码  收藏代码
Create JDK Proxy: 43 ms 
Create CGLIB Proxy: 129 ms 
Run JDK Proxy: 940 ms, 1,500,069 t/s 
Run CGLIB Proxy: 299 ms, 4,715,937 t/s 
------------------- 
Run JDK Proxy: 921 ms, 1,531,015 t/s 
Run CGLIB Proxy: 269 ms, 5,241,878 t/s 
------------------- 
Run JDK Proxy: 932 ms, 1,512,945 t/s 
Run CGLIB Proxy: 265 ms, 5,321,001 t/s 
------------------- 

CGLIB创建代理对象速度大概比JDK Proxy慢3倍,执行速度是JDK Proxy的3倍以上

字节码比较:
把测试代码中被注释的部分打开,生成class文件后执行javap -c 类名
JDK动态代理生成的字节码:
Java代码  收藏代码
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."<init>":(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 


CGLIB生成的字节码:
Java代码  收藏代码
public final int count(); 
  Code: 
     0: aload_0        
     1: getfield      #37                 // Field CGLIB$CALLBACK_0:Lnet/sf/cglib/proxy/MethodInterceptor; 
     4: dup            
     5: ifnonnull     17 
     8: pop            
     9: aload_0        
    10: invokestatic  #41                 // Method CGLIB$BIND_CALLBACKS:(Ljava/lang/Object;)V 
    13: aload_0        
    14: getfield      #37                 // Field CGLIB$CALLBACK_0:Lnet/sf/cglib/proxy/MethodInterceptor; 
    17: dup            
    18: ifnull        52 
    21: aload_0        
    22: getstatic     #43                 // Field CGLIB$count$0$Method:Ljava/lang/reflect/Method; 
    25: getstatic     #45                 // Field CGLIB$emptyArgs:[Ljava/lang/Object; 
    28: getstatic     #47                 // Field CGLIB$count$0$Proxy:Lnet/sf/cglib/proxy/MethodProxy; 
    31: invokeinterface #53,  5           // InterfaceMethod net/sf/cglib/proxy/MethodInterceptor.intercept:(Ljava/lang/Object;Ljava/lang/reflect/Method;[Ljava/lang/Object;Lnet/sf/cglib/proxy/MethodProxy;)Ljava/lang/Object; 
    36: dup            
    37: ifnonnull     45 
    40: pop            
    41: iconst_0       
    42: goto          51 
    45: checkcast     #55                 // class java/lang/Number 
    48: invokevirtual #58                 // Method java/lang/Number.intValue:()I 
    51: ireturn        
    52: aload_0        
    53: invokespecial #35                 // Method CountServiceImpl.count:()I 
    56: ireturn        

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转载自gelongmei.iteye.com/blog/2304390
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