SpringSpring AOPSpring Proxy

Spring 핵심원리 고급편 - ProxyFactory 적용

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참고

본 포스트는 김영한의 스프링 핵심 원리 - 고급편 내용을 참고해 만들었습니다.

인터페이스 객체에 프록시 팩토리 적용

스프링에서 제공하는 MethodInterceptor 인터페이스를 이용해 

import org.aopalliance.intercept.MethodInterceptor;

public class LogTraceAdvice implements MethodInterceptor {

    private final LogTrace logTrace;

    public LogTraceAdvice(LogTrace logTrace) {
        this.logTrace = logTrace;
    }

    @Override
    public Object invoke(MethodInvocation invocation) throws Throwable {
        TraceStatus status = null;

        try {
            Method method = invocation.getMethod();
            String message = method.getDeclaringClass().getSimpleName() + "." + method.getName() + "()";
            status = logTrace.begin(message);

            // 로직 호출
            Object result = invocation.proceed();

            logTrace.end(status);

            return result;
        } catch (Exception ex) {
            logTrace.exception(status, ex);
            throw ex;
        }
    }
}
@Slf4j
@Configuration
public class ProxyFactoryConfigV1 {

    @Bean
    public OrderControllerV1 orderControllerV1(LogTrace logTrace){
        OrderControllerV1 orderController = new OrderControllerV1Impl(orderServiceV1(logTrace));

        // OrderControllerV1 객체를 Proxy 객체로 생성한다.
        ProxyFactory factory = new ProxyFactory(orderController); 
        factory.addAdvisor(getAdvisor(logTrace)); // Advisor 를 적용한다.
        OrderControllerV1 proxy = (OrderControllerV1) factory.getProxy();

        log.info("ProxyFactory proxy = {}, target = {}", proxy.getClass(), orderController);

        return proxy;
    }

    @Bean
    public OrderServiceV1 orderServiceV1(LogTrace logTrace){
        OrderServiceV1Impl orderService = new OrderServiceV1Impl(orderRepositoryV1(logTrace));

        // OrderServiceV1Impl 객체를 Proxy 객체로 생성한다.
        ProxyFactory factory = new ProxyFactory(orderService);
        factory.addAdvisor(getAdvisor(logTrace));  // Advisor 를 적용한다.
        OrderServiceV1 proxy = (OrderServiceV1) factory.getProxy();

        log.info("ProxyFactory proxy = {}, target = {}", proxy.getClass(), orderService);

        return proxy;
    }

    @Bean
    public OrderRepositoryV1 orderRepositoryV1(LogTrace logTrace){
        OrderRepositoryV1Impl orderRepository = new OrderRepositoryV1Impl();

        // OrderRepositoryV1Impl 객체를 Proxy 객체로 생성한다.
        ProxyFactory factory = new ProxyFactory(orderRepository);
        factory.addAdvisor(getAdvisor(logTrace));  // Advisor 를 적용한다.
        OrderRepositoryV1 proxy = (OrderRepositoryV1) factory.getProxy();
        
        log.info("ProxyFactory proxy = {}, target = {}", proxy.getClass(), orderRepository);

        return proxy;
    }

    private Advisor getAdvisor(LogTrace logTrace) {
        // Point Cut
        NameMatchMethodPointcut pointcut = new NameMatchMethodPointcut();
        pointcut.setMappedNames("request*", "order*", "save*");

        // advice
        LogTraceAdvice advice = new LogTraceAdvice(logTrace);

        // Pointcut과 Advice 를 이용해 Advisor 객체를 만들어준다.
        return new DefaultPointcutAdvisor(pointcut, advice);
    }
}

애플리케이션 로딩 시점에서 해당 Bean 이 Loading 되는 것을 확인할 수 있다.

2021-12-05 01:09:21.671  INFO 64531 --- [           main] h.p.c.v.ProxyFactoryConfigV1             : ProxyFactory proxy = class com.sun.proxy.$Proxy50, target = hello.proxy.app.v1.OrderRepositoryV1Impl@5555ffcf
2021-12-05 01:09:21.673  INFO 64531 --- [           main] h.p.c.v.ProxyFactoryConfigV1             : ProxyFactory proxy = class com.sun.proxy.$Proxy52, target = hello.proxy.app.v1.OrderServiceV1Impl@5a2fa51f
2021-12-05 01:09:21.674  INFO 64531 --- [           main] h.p.c.v.ProxyFactoryConfigV1             : ProxyFactory proxy = class com.sun.proxy.$Proxy53, target = hello.proxy.app.v1.OrderControllerV1Impl@6ecdbab8

구체클래스에 프록시 팩토리 적용

구체 클래스에 적용

@Slf4j
@Configuration
public class ProxyFactoryConfigV2 {

    @Bean
    public OrderControllerV2 orderControllerV2(LogTrace logTrace){
        OrderControllerV2 orderController = new OrderControllerV2(orderServiceV2(logTrace));

        // OrderControllerV2 객체를 Proxy 객체로 생성
        ProxyFactory factory = new ProxyFactory(orderController);
        factory.addAdvisor(getAdvisor(logTrace));
        OrderControllerV2 proxy = (OrderControllerV2) factory.getProxy();

        log.info("ProxyFactory proxy = {}, target = {}", proxy.getClass(), orderController);

        return proxy;
    }

    @Bean
    public OrderServiceV2 orderServiceV2(LogTrace logTrace){
        OrderServiceV2 orderService = new OrderServiceV2(orderRepositoryV2(logTrace));

        // OrderServiceV2 객체를 Proxy 객체로 생성
        ProxyFactory factory = new ProxyFactory(orderService);
        factory.addAdvisor(getAdvisor(logTrace));
        OrderServiceV2 proxy = (OrderServiceV2) factory.getProxy();

        log.info("ProxyFactory proxy = {}, target = {}", proxy.getClass(), orderService);

        return proxy;
    }

    @Bean
    public OrderRepositoryV2 orderRepositoryV2(LogTrace logTrace){
        OrderRepositoryV2 orderRepository = new OrderRepositoryV2();

        // OrderRepositoryV2 객체를 Proxy 객체로 생성
        ProxyFactory factory = new ProxyFactory(orderRepository);
        factory.addAdvisor(getAdvisor(logTrace));
        OrderRepositoryV2 proxy = (OrderRepositoryV2) factory.getProxy();
        log.info("ProxyFactory proxy = {}, target = {}", proxy.getClass(), orderRepository);

        return proxy;
    }

    private Advisor getAdvisor(LogTrace logTrace) {

        // Point Cut
        NameMatchMethodPointcut pointcut = new NameMatchMethodPointcut();
        pointcut.setMappedNames("request*", "order*", "save*");

        // advice
        LogTraceAdvice advice = new LogTraceAdvice(logTrace);

        // Pointcut 과 Advice 를 이용해 Advisor 객체를 생성한다.
        return new DefaultPointcutAdvisor(pointcut, advice);
    }
}

CGLIB 로 생성된 것을 확인할 수 있다.

2021-12-05 01:18:11.287  INFO 64747 --- [           main] h.p.c.v.ProxyFactoryConfigV2             : ProxyFactory proxy = class hello.proxy.app.v2.OrderRepositoryV2$$EnhancerBySpringCGLIB$$47389dce, target = hello.proxy.app.v2.OrderRepositoryV2@75961f16
2021-12-05 01:18:11.292  INFO 64747 --- [           main] h.p.c.v.ProxyFactoryConfigV2             : ProxyFactory proxy = class hello.proxy.app.v2.OrderServiceV2$$EnhancerBySpringCGLIB$$9b88cbf1, target = hello.proxy.app.v2.OrderServiceV2@2dd2e270
2021-12-05 01:18:11.295  INFO 64747 --- [           main] h.p.c.v.ProxyFactoryConfigV2             : ProxyFactory proxy = class hello.proxy.app.v2.OrderControllerV2$$EnhancerBySpringCGLIB$$493fc484, target = hello.proxy.app.v2.OrderControllerV2@7d04529c
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