Java的动态编译 cglib / asm 等
http://www.qqread.com/netbase/w478517.html
菜鸟课堂：几个动态代理Proxy工具性能比较
JDK 6和CGLib cglib-nodep-2.2.jar对比结果：
JDK Proxy: 1,049,937 calls/s
CGLIB: 2,820,130 calls/s
如果使用cglib以前版本，性能更快：
JDK Proxy: 1,037,575 calls/s
CGLIB: 3,112,727 calls/s
而JDK 6和JavaAssit 3.11测试结果如下：
JDK Proxy: 1,037,575 calls/s
JAVAASSIST: 626,695 calls/s
从数据上看，cglib性能最好。但是和ASM、直接调用比较还不知道。
代码
public
class
ProxyPerformanceComparison2 {
public static void main(String[] args) throws Exception {
Callable < integer > jdkProxy = (Callable < integer > )
Proxy.newProxyInstance(ClassLoader.getSystemClassLoader(), new Class[] {
Callable. class },
new JdkHandler( new Counter()));
ProxyFactory f = new ProxyFactory();
f.setInterfaces( new Class[] { Callable. class });
Class c = f.createClass();
Callable < integer > cglibProxy = (Callable < integer > ) c.newInstance();
((ProxyObject) cglibProxy).setHandler
( new JavaAssitInterceptor( new Counter()));
for ( int i2 = 0 ; i2 < 10 ; i2 ++ ) {
iterate(jdkProxy, " JDK Proxy: " );
iterate(cglibProxy, " JAVAASSIST: " );
System.err.println();
}
}
static final DecimalFormat format = new DecimalFormat();
static void iterate(Callable < integer > callable, String label)
throws Exception {
int count = 10000000 ;
long time = System.currentTimeMillis();
int total = 0 ;
for ( int i = 0 ; i < count; i ++ ) {
total += callable.call();
}
time = System.currentTimeMillis() - time;
System.err.println(label + format.format
(count * 1000 / time) + " calls/s " );
}
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);
}
}
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);
}
}
static class Counter implements Callable < integer > {
int count = 0 ;
public Integer call() throws Exception {
return count ++ ;
}
}
}
public static void main(String[] args) throws Exception {
Callable < integer > jdkProxy = (Callable < integer > )
Proxy.newProxyInstance(ClassLoader.getSystemClassLoader(), new Class[] {
Callable. class },
new JdkHandler( new Counter()));
ProxyFactory f = new ProxyFactory();
f.setInterfaces( new Class[] { Callable. class });
Class c = f.createClass();
Callable < integer > cglibProxy = (Callable < integer > ) c.newInstance();
((ProxyObject) cglibProxy).setHandler
( new JavaAssitInterceptor( new Counter()));
for ( int i2 = 0 ; i2 < 10 ; i2 ++ ) {
iterate(jdkProxy, " JDK Proxy: " );
iterate(cglibProxy, " JAVAASSIST: " );
System.err.println();
}
}
static final DecimalFormat format = new DecimalFormat();
static void iterate(Callable < integer > callable, String label)
throws Exception {
int count = 10000000 ;
long time = System.currentTimeMillis();
int total = 0 ;
for ( int i = 0 ; i < count; i ++ ) {
total += callable.call();
}
time = System.currentTimeMillis() - time;
System.err.println(label + format.format
(count * 1000 / time) + " calls/s " );
}
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);
}
}
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);
}
}
static class Counter implements Callable < integer > {
int count = 0 ;
public Integer call() throws Exception {
return count ++ ;
}
}
}
---------------------------------------------
http://www.zx2010.com/program/java-jdk-cglib-proxy-performance-comparison.asp
JDK动态代理与CGLIB代理的性能测试
result:
JDK Proxy: 765,092 calls/s
CGLIB: 1,503,268 calls/s
JDK Proxy: 716,132 calls/s
CGLIB: 991,607 calls/s
JDK Proxy: 601,820 calls/s
CGLIB: 1,128,052 calls/s
结果也仅仅说明了cglib性能提高了2倍左右。还是不行。
代码
import
java.lang.reflect.
*
;
import net.sf.cglib.proxy. * ;
import java.text. * ;
import java.util.concurrent.Callable;
public class ProxyPerformanceComparison {
public static void main(String[] args) throws Exception {
Callable < Integer > jdkProxy = (Callable < Integer > ) java.lang.reflect.Proxy.newProxyInstance(
ClassLoader.getSystemClassLoader(),
new Class[] { Callable. class },
new JdkHandler( new Counter())
);
Enhancer enhancer = new Enhancer();
enhancer.setCallback( new CglibInterceptor( new Counter()));
enhancer.setInterfaces( new Class[] { Callable. class });
Callable < Integer > cglibProxy = (Callable < Integer > ) enhancer.create();
for ( int i2 = 0 ; i2 < 10 ; i2 ++ ) {
iterate(jdkProxy, " JDK Proxy: " );
iterate(cglibProxy, " CGLIB: " );
System.err.println();
}
}
static final DecimalFormat format = new DecimalFormat();
static void iterate(Callable < Integer > callable, String label) throws Exception {
int count = 10000000 ;
long time = System.currentTimeMillis();
int total = 0 ;
for ( int i = 0 ; i < count; i ++ ) {
total += callable.call();
}
time = System.currentTimeMillis() - time;
System.err.println(label + format.format(count * 1000 / time) + " calls/s " ); }
/* inner class */
static class JdkHandler implements java.lang.reflect.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);
}
}
/* inner class */
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);
}
}
/* inner class */
static class Counter implements Callable < Integer > {
int count = 0 ;
public Integer call() throws Exception {
return count ++ ;
}
}
}
import net.sf.cglib.proxy. * ;
import java.text. * ;
import java.util.concurrent.Callable;
public class ProxyPerformanceComparison {
public static void main(String[] args) throws Exception {
Callable < Integer > jdkProxy = (Callable < Integer > ) java.lang.reflect.Proxy.newProxyInstance(
ClassLoader.getSystemClassLoader(),
new Class[] { Callable. class },
new JdkHandler( new Counter())
);
Enhancer enhancer = new Enhancer();
enhancer.setCallback( new CglibInterceptor( new Counter()));
enhancer.setInterfaces( new Class[] { Callable. class });
Callable < Integer > cglibProxy = (Callable < Integer > ) enhancer.create();
for ( int i2 = 0 ; i2 < 10 ; i2 ++ ) {
iterate(jdkProxy, " JDK Proxy: " );
iterate(cglibProxy, " CGLIB: " );
System.err.println();
}
}
static final DecimalFormat format = new DecimalFormat();
static void iterate(Callable < Integer > callable, String label) throws Exception {
int count = 10000000 ;
long time = System.currentTimeMillis();
int total = 0 ;
for ( int i = 0 ; i < count; i ++ ) {
total += callable.call();
}
time = System.currentTimeMillis() - time;
System.err.println(label + format.format(count * 1000 / time) + " calls/s " ); }
/* inner class */
static class JdkHandler implements java.lang.reflect.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);
}
}
/* inner class */
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);
}
}
/* inner class */
static class Counter implements Callable < Integer > {
int count = 0 ;
public Integer call() throws Exception {
return count ++ ;
}
}
}
------------------------------
http://www.javaeye.com/topic/314894
10000次对象复制测试结果(ms)：
task 直接复制 31
task java标准反射复制 610
task cglib Fast复制(不好的写法) 890
task cglib beancopier复制 125
使用beancopy，意思是把第一个bean的数据copy到第二个。貌似没有什么用。是2个对象之间复制。
o
=
clazz0.newInstance();
BeanCopier beanCopier = BeanCopier.create(clazz0, managelogVO.getClass(), false );
beanCopier.copy(o,managelogVO, null );
BeanCopier beanCopier = BeanCopier.create(clazz0, managelogVO.getClass(), false );
beanCopier.copy(o,managelogVO, null );
直接调用
ManagelogVO newVO
=
new
ManagelogVO();
newVO.setLogid(managelogVO.getLogid());
newVO.setOprcode(managelogVO.getOprcode());
newVO.setLogid(managelogVO.getLogid());
newVO.setOprcode(managelogVO.getOprcode());
Java反射
代码
Object o
=
null
;
try {
Class clazz = Class.forName( " demo.cglib.ManagelogVO " );
o = clazz.newInstance();
Method setterMethod = null ;
Method getterMethod = null ;
Object v = null ;
setterMethod = clazz.getMethod( " setLogid " , new Class[]{Long. class });
getterMethod = clazz.getMethod( " getLogid " , null );
v = getterMethod.invoke(managelogVO, null );
setterMethod.invoke(o, new Object[]{v});
setterMethod = clazz.getMethod( " setOprcode " , new Class[]{String. class });
getterMethod = clazz.getMethod( " getOprcode " , null );
v = getterMethod.invoke(managelogVO, null );
setterMethod.invoke(o, new Object[]{v});
try {
Class clazz = Class.forName( " demo.cglib.ManagelogVO " );
o = clazz.newInstance();
Method setterMethod = null ;
Method getterMethod = null ;
Object v = null ;
setterMethod = clazz.getMethod( " setLogid " , new Class[]{Long. class });
getterMethod = clazz.getMethod( " getLogid " , null );
v = getterMethod.invoke(managelogVO, null );
setterMethod.invoke(o, new Object[]{v});
setterMethod = clazz.getMethod( " setOprcode " , new Class[]{String. class });
getterMethod = clazz.getMethod( " getOprcode " , null );
v = getterMethod.invoke(managelogVO, null );
setterMethod.invoke(o, new Object[]{v});
cglib反射
代码
Object o
=
null
;
try {
Class clazz0 = Class.forName( " demo.cglib.ManagelogVO " );
FastClass clazz = FastClass.create(clazz0);
o = clazz.newInstance();
FastMethod setterMethod = null ;
FastMethod getterMethod = null ;
Object v = null ;
setterMethod = clazz.getMethod( " setLogid " , new Class[]{Long. class });
getterMethod = clazz.getMethod( " getLogid " , null );
v = getterMethod.invoke(managelogVO, new Object[]{});
setterMethod.invoke(o, new Object[]{v});
setterMethod = clazz.getMethod( " setOprcode " , new Class[]{String. class });
getterMethod = clazz.getMethod( " getOprcode " , null );
v = getterMethod.invoke(managelogVO, new Object[]{});
setterMethod.invoke(o, new Object[]{v});
try {
Class clazz0 = Class.forName( " demo.cglib.ManagelogVO " );
FastClass clazz = FastClass.create(clazz0);
o = clazz.newInstance();
FastMethod setterMethod = null ;
FastMethod getterMethod = null ;
Object v = null ;
setterMethod = clazz.getMethod( " setLogid " , new Class[]{Long. class });
getterMethod = clazz.getMethod( " getLogid " , null );
v = getterMethod.invoke(managelogVO, new Object[]{});
setterMethod.invoke(o, new Object[]{v});
setterMethod = clazz.getMethod( " setOprcode " , new Class[]{String. class });
getterMethod = clazz.getMethod( " getOprcode " , null );
v = getterMethod.invoke(managelogVO, new Object[]{});
setterMethod.invoke(o, new Object[]{v});
---------------------------
http://www.ibm.com/developerworks/cn/java/j-lo-asm30/index.html
使用asm实现AOP
http://www.oschina.net/bbs/thread/4239
cglib的例子