프록시 팩토리

public interface ServiceInterface {
    void save();

    void find();
}

@Slf4j
public class ServiceImpl implements ServiceInterface {
    @Override
    public void save() {
        log.info("save 호출");
    }

    @Override
    public void find() {
        log.info("find 호출");
    }
}

@Slf4j
public class ConcreteService {
    public void call() {
        log.info("ConcreteService 호출");
    }
}

@Slf4j
public class TimeAdvice implements MethodInterceptor {
    @Override
    public Object invoke(MethodInvocation invocation) throws Throwable {
        log.info("TimeProxy 실행");
        long startTime = System.currentTimeMillis();

        Object result = invocation.proceed();

        long endTime = System.currentTimeMillis();
        long resultTime = endTime - startTime;
        log.info("TimeProxy 종료 resultTime={}", resultTime);
        return result;
    }
}

- import org.aopalliance.intercept.MethodInterceptor; (주의)

 

 

@Slf4j
public class ProxyFactoryTest {

    @Test
    @DisplayName("인터페이스가 있으면 JDK 동적 프록시 사용")
    void interfaceProxy() {
        ServiceInterface target = new ServiceImpl();
        ProxyFactory proxyFactory = new ProxyFactory(target);
        proxyFactory.addAdvice(new TimeAdvice());
        ServiceInterface proxy = (ServiceInterface) proxyFactory.getProxy();
        log.info("targetClass={}", target.getClass());
        log.info("proxyClass={}", proxy.getClass());

        proxy.save();

        assertThat(AopUtils.isAopProxy(proxy)).isTrue();
        assertThat(AopUtils.isJdkDynamicProxy(proxy)).isTrue();
        assertThat(AopUtils.isCglibProxy(proxy)).isFalse();
    }

    @Test
    @DisplayName("구체 클래스만 있으면 CGLIB 사용")
    void concreteProxy() {
        ConcreteService target = new ConcreteService();
        ProxyFactory proxyFactory = new ProxyFactory(target);
        proxyFactory.addAdvice(new TimeAdvice());
        ConcreteService proxy = (ConcreteService) proxyFactory.getProxy();
        log.info("targetClass={}", target.getClass());
        log.info("proxyClass={}", proxy.getClass());

        proxy.call();

        assertThat(AopUtils.isAopProxy(proxy)).isTrue();
        assertThat(AopUtils.isJdkDynamicProxy(proxy)).isFalse();
        assertThat(AopUtils.isCglibProxy(proxy)).isTrue();
    }

    @Test
    @DisplayName("ProxyTargetClass 옵션을 사용하면 인터페이스가 있어도 CGLIB를 사용하고, 클래스 기반 프록시 사용")
    void proxyTargetClass() {
        ServiceInterface target = new ServiceImpl();
        ProxyFactory proxyFactory = new ProxyFactory(target);
        proxyFactory.setProxyTargetClass(true);
        proxyFactory.addAdvice(new TimeAdvice());
        ServiceInterface proxy = (ServiceInterface) proxyFactory.getProxy();
        log.info("targetClass={}", target.getClass());
        log.info("proxyClass={}", proxy.getClass());

        proxy.save();

        assertThat(AopUtils.isAopProxy(proxy)).isTrue();
        assertThat(AopUtils.isJdkDynamicProxy(proxy)).isFalse();
        assertThat(AopUtils.isCglibProxy(proxy)).isTrue();
    }
}

- 프록시 팩토리를 사용하여 JDK 동적 프록시와 CGLIB를 둘 다 사용할 수 있게 된다. 인터페이스가 있어도 proxyFactory.setProxyTargetClass(true); true로 주면 구체 클래스처럼 CGLIB를 사용할 수 있다.