spring之lookupmethod&replacemethod

at org.springframework.beans.factory.support.CglibSubclassingInstantiationStrategy$CglibSubclassCreator.instantiate(CglibSubclassingInstantiationStrategy.java:115)
at org.springframework.beans.factory.support.CglibSubclassingInstantiationStrategy.instantiateWithMethodInjection(CglibSubclassingInstantiationStrategy.java:83)
at org.springframework.beans.factory.support.CglibSubclassingInstantiationStrategy.instantiateWithMethodInjection(CglibSubclassingInstantiationStrategy.java:75)
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:93)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1108)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1060)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:513)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
- locked <0x667> (a java.util.concurrent.ConcurrentHashMap)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:759)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:866)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:542)
- locked <0x668> (a java.lang.Object)
at org.springframework.context.support.ClassPathXmlApplicationContext.(ClassPathXmlApplicationContext.java:139)
at org.springframework.context.support.ClassPathXmlApplicationContext.(ClassPathXmlApplicationContext.java:93)
at AnnoIoCTest.main(AnnoIoCTest.java:7)

public Object instantiate(RootBeanDefinition bd, String beanName, BeanFactory owner) {
if(bd.getMethodOverrides().isEmpty()) {
Object var5 = bd.constructorArgumentLock;
Constructor constructorToUse;
synchronized(bd.constructorArgumentLock) {
constructorToUse = (Constructor)bd.resolvedConstructorOrFactoryMethod;
if(cOnstructorToUse== null) {
final Class clazz = bd.getBeanClass();
if(clazz.isInterface()) {
throw new BeanInstantiationException(clazz, "Specified class is an interface");
}
try {
if(System.getSecurityManager() != null) {
constructorToUse = (Constructor)AccessController.doPrivileged(new PrivilegedExceptionAction() {
public Constructor run() throws Exception {
return clazz.getDeclaredConstructor((Class[])null);
}
});
} else {
constructorToUse = clazz.getDeclaredConstructor((Class[])null);
}
bd.resolvedConstructorOrFactoryMethod = constructorToUse;
} catch (Throwable var9) {
throw new BeanInstantiationException(clazz, "No default constructor found", var9);
}
}
}
return BeanUtils.instantiateClass(constructorToUse, new Object[0]);
} else {
return this.instantiateWithMethodInjection(bd, beanName, owner); 如果存在bean 覆盖，那么就 将那个方法注入过来吧！
}
}

public Object instantiate(Constructor ctor, Object... args) {
Class subclass = this.createEnhancedSubclass(this.beanDefinition); // 正是这里， 创建了一个 cglib 子类
Object instance;
if(ctor == null) {
instance = BeanUtils.instantiateClass(subclass);// 实例化它
} else {
try {
Constructor factory = subclass.getConstructor(ctor.getParameterTypes());
instance = factory.newInstance(args);
} catch (Exception var6) {
throw new BeanInstantiationException(this.beanDefinition.getBeanClass(), "Failed to invoke constructor for CGLIB enhanced subclass [" + subclass.getName() + "]", var6);
}
}
Factory factory1 = (Factory)instance;
factory1.setCallbacks(new Callback[]{NoOp.INSTANCE, new CglibSubclassingInstantiationStrategy.LookupOverrideMethodInterceptor(this.beanDefinition, this.owner), new CglibSubclassingInstantiationStrategy.ReplaceOverrideMethodInterceptor(this.beanDefinition, this.owner)});
return instance;// setCallBack 是给它设置一些拦截器， 以便做些实际的操作。 因为默认的cglib代理类并不会做任何事情。
}

public Object intercept(Object obj, Method method, Object[] args, MethodProxy mp) throws Throwable {
LookupOverride lo = (LookupOverride)this.getBeanDefinition().getMethodOverrides().getOverride(method);
Object[] argsToUse = args.length > 0?args:null;
return StringUtils.hasText(lo.getBeanName())?this.owner.getBean(lo.getBeanName(), argsToUse):this.owner.getBean(method.getReturnType(), argsToUse);
}

"player" class="com.baobaotao.Player">
"getDelegete" replacer="playerLk">
"look">



"playerLk" class="com.baobaotao.LkMethodReplacer">
"vvv">

public class LkMethodReplacer implements MethodReplacer {
public String str;
public LkMethodReplacer(String str) {
this.str = str;
}
public PlayerLk reimplement(Object o, Method method, Object[] objects) throws Throwable {
System.out.println("LkMethodReplacer.reimplement");
return new PlayerLk(str);
}
}