当动态代理遇到ioc （二）cglib

接mybatis guice 事务代理切面的代码：

 

package sun.myproxy;

import net.sf.cglib.proxy.Enhancer;
import net.sf.cglib.proxy.MethodInterceptor;
import net.sf.cglib.proxy.MethodProxy;

import java.lang.reflect.Method;

/**
 * https://www.cnblogs.com/silyvin/p/13778331.html
 * Created by joyce on 2020/10/7.
 */
public class OdsTransactionCglibFactory extends OdsTransactionProxyFactory implements MethodInterceptor {

    public OdsTransactionCglibFactory(Object target) {
        super(target);
    }

    @Override
    public Object intercept(Object o, Method method, Object[] args, MethodProxy methodProxy) throws Throwable {

        IOC();

        MY_TRANSACTIONAL scef_db_transactional = method.getAnnotation(MY_TRANSACTIONAL.class);

// 迎合有些人习惯将注解加到接口上
        Class[] interfaces = target.getClass().getInterfaces();
        if(scef_db_transactional == null) {
            for(Class inter : interfaces) {
                Method classMethod = inter.getMethod(method.getName(), method.getParameterTypes());
                scef_db_transactional = classMethod.getAnnotation(MY_TRANSACTIONAL.class);
                break;
            }
        }

        // MyServiceImpl.method
        {
            Method classMethod = method;
            System.out.println(classMethod);
            MY_TRANSACTIONAL my_transactional = classMethod.getAnnotation(MY_TRANSACTIONAL.class);
            System.out.println(my_transactional);
        }

        // MyServiceImpl&&CGLIB.method
        {
            Method classMethod = o.getClass().getMethod(method.getName(), method.getParameterTypes());
            System.out.println(classMethod);
            MY_TRANSACTIONAL my_transactional = classMethod.getAnnotation(MY_TRANSACTIONAL.class);
            System.out.println(my_transactional);
        }

        // MyService.method
        {
            Method classMethod = interfaces[0].getMethod(method.getName(), method.getParameterTypes());
            System.out.println(classMethod);
            MY_TRANSACTIONAL my_transactional = classMethod.getAnnotation(MY_TRANSACTIONAL.class);
            System.out.println(my_transactional);
        }

        if(scef_db_transactional != null) {
            return invokeHasTransactional(scef_db_transactional, method, args);
        } else {
            return invokeNoTransactional(method, args);
        }
    }

    @Override
    public Object getProxyInstance(){
        Enhancer en = new Enhancer();
        en.setSuperclass(target.getClass());
        en.setCallback(this);
        Object oCglib = en.create();
        return oCglib;
    }
}

 

public void sun.myproxybean.MyServiceImpl.multi()
@sun.myproxy.MY_TRANSACTIONAL()
public final void sun.myproxybean.MyServiceImpl$$EnhancerByCGLIB$$5b3ba48d.multi()
null
public abstract void sun.myproxybean.MyService.multi()
null

 

以下为 当动态代理遇到ioc （四）真正的cglib 第5点补充控制台日志：

public void sun.myproxybean.MyDaoImpl.multi()
@sun.myproxy.MY_TRANSACTIONAL()
public final void sun.myproxybean.MyDaoImpl$$EnhancerByCGLIB$$4b5f7f6c.multi()
null
public abstract void sun.myproxybean.MyDao.multi()
null

 

结论：

1 cglib生成子类时，不保留父类方法注解

2 由于注入的是cglib proxy，而@Autowired项对象在原始类，其父类上，而其父类原始对象没有被ioc，故仍需要手动反哺

3 asm cglib容易包冲突