mini-spring基础篇：AOP（四）：AOP代理工厂

一、AOP代理工厂

代码分支：proxy-factory

增加AOP代理工厂ProxyFactory，由AdvisedSupport#proxyTargetClass属性决定使用JDK动态代理还是CGLIB动态代理。

测试：

public class DynamicProxyTest {

private AdvisedSupport advisedSupport;

@Before
public void setup() {
WorldService worldService = new WorldServiceImpl();

advisedSupport = new AdvisedSupport();
TargetSource targetSource = new TargetSource(worldService);
WorldServiceInterceptor methodInterceptor = new WorldServiceInterceptor();
MethodMatcher methodMatcher = new AspectJExpressionPointcut("execution(* org.springframework.test.service.WorldService.explode(..))").getMethodMatcher();
advisedSupport.setTargetSource(targetSource);
advisedSupport.setMethodInterceptor(methodInterceptor);
advisedSupport.setMethodMatcher(methodMatcher);
}

@Test
public void testProxyFactory() throws Exception {
// 使用JDK动态代理
advisedSupport.setProxyTargetClass(false);
WorldService proxy = (WorldService) new ProxyFactory(advisedSupport).getProxy();
proxy.explode();

// 使用CGLIB动态代理
advisedSupport.setProxyTargetClass(true);
proxy = (WorldService) new ProxyFactory(advisedSupport).getProxy();
proxy.explode();
}
}

ProxyFactory:

public class ProxyFactory {

private AdvisedSupport advisedSupport;

public ProxyFactory(AdvisedSupport advisedSupport) {
this.advisedSupport = advisedSupport;
}

public Object getProxy() {
return createAopProxy().getProxy();
}

private AopProxy createAopProxy() {
if (advisedSupport.isProxyTargetClass()) {
return new CglibAopProxy(advisedSupport);
}

return new JdkDynamicAopProxy(advisedSupport);
}
}

我们总结一下上面代码的步骤：

二、看一下cglib动态代理，和jdk动态代理创建代理的方法

2.1 cglib动态代理

和之前的一样，使用Enhancer

2.2 jdk动态代理（默认）

这里的h参数，指的就是InvocationHandler，也就是当前对象JdkDynamicAopProxy；后续是调用了JdkDynamicAopProxy内部的invoke方法，从而实现了代理的功能