aop动态代理源码分析

package org.springframework.aop.framework;
import java.io.Serializable;
import java.lang.reflect.Proxy;

import org.springframework.aop.SpringProxy;


@SuppressWarnings("serial")
public class DefaultAopProxyFactory implements AopProxyFactory, Serializable {
  
  //动态代理方法
@Override
public AopProxy createAopProxy(AdvisedSupport config) throws AopConfigException {
if (config.isOptimize() || config.isProxyTargetClass() || hasNoUserSuppliedProxyInterfaces(config)) {
Class<?> targetClass = config.getTargetClass();
if (targetClass == null) {
throw new AopConfigException("TargetSource cannot determine target class: " +
"Either an interface or a target is required for proxy creation.");
}
if (targetClass.isInterface() || Proxy.isProxyClass(targetClass)) {
return new JdkDynamicAopProxy(config);
}
return new ObjenesisCglibAopProxy(config);
}
else {
return new JdkDynamicAopProxy(config);
}
}


private boolean hasNoUserSuppliedProxyInterfaces(AdvisedSupport config) {
Class<?>[] ifcs = config.getProxiedInterfaces();
return (ifcs.length == 0 || (ifcs.length == 1 && SpringProxy.class.isAssignableFrom(ifcs[0])));
}

}
config.isOptimize()-------------------------------------------------是否进行优化,默认是false
config.isProxyTargetClass()-----------------------------------------是否强制使用cglib代理。但它为true也不是肯定就采用cglib,因为下面还有一个判断条件,即目标类是接口,则使用jdk动态代理的方式。
hasNoUserSuppliedProxyInterfaces(config)----------------------------目标类没有实现接口,或者有但是是接口类型是SpringProxy


当config.isOptimize(),config.isProxyTargetClass(),hasNoUserSuppliedProxyInterfaces(config)全部为false时候使用JDK动态代理JdkDynamicAopProxy
当config.isOptimize(),config.isProxyTargetClass(),hasNoUserSuppliedProxyInterfaces(config)有一个为true,且代理对象不为接口时或者配置注解
@EnableAspectJAutoProxy(proxyTargetClass = true),使用cglib动态代理

 

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转载自www.cnblogs.com/WQLLL/p/11073388.html