프록시 팩토리 - 적용1

지금까지 학습한 프록시 팩토리를 사용해서 애플리케이션에 프록시를 만들어보자.
먼저 인터페이스가 있는 v1 애플리케이션에 LogTrace 기능을 프록시 팩토리를 통해서 프록시를 만들어
적용해보자.

 

1. Advice

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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 e){
            logTrace.exception(status, e);
            throw e;
        }
    }
}

 

 

2. Config

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@Slf4j
@Configuration
public class ProxyFactoryConfigV1 {

    @Bean
    public OrderControllerV1 orderControllerV1(LogTrace logTrace){
        OrderControllerV1 orderController = new OrderControllerV1Impl(orderServiceV1(logTrace));
        ProxyFactory proxyFactory = new ProxyFactory(orderController);
        proxyFactory.addAdvisor(getAdvisor(logTrace));
        OrderControllerV1 proxy = (OrderControllerV1) proxyFactory.getProxy();
        log.info("Proxyfactory proxy={}, target={}", proxy.getClass(), orderController.getClass());

        return proxy;
    }

    @Bean
    public OrderServiceV1 orderServiceV1(LogTrace logTrace){
        OrderServiceV1 orderService = new OrderServiceV1Impl(orderRepositoryV1(logTrace));
        ProxyFactory proxyFactory = new ProxyFactory(orderService);
        proxyFactory.addAdvisor(getAdvisor(logTrace));
        OrderServiceV1 proxy = (OrderServiceV1) proxyFactory.getProxy();
        log.info("Proxyfactory proxy={}, target={}", proxy.getClass(), orderService.getClass());

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

        ProxyFactory proxyFactory = new ProxyFactory(orderRepository);
        proxyFactory.addAdvisor(getAdvisor(logTrace));
        OrderRepositoryV1 proxy = (OrderRepositoryV1) proxyFactory.getProxy();

        log.info("Proxyfactory proxy={}, target={}", proxy.getClass(), orderRepository.getClass());
        return proxy;
    }

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

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

        return new DefaultPointcutAdvisor(pointcut, advice);

    }
}

• 포인트컷은 NameMatchMethodPointcut 을 사용한다. 
• 여기에는 심플 매칭 기능이 있어서 * 을 매칭할 수 있다.
• request* , order* , save* : request 로 시작하는 메서드에 포인트컷은 true 를 반환한다.
• 나머지도 같다.
• 이렇게 설정한 이유는 noLog() 메서드에는 어드바이스를 적용하지 않기 위해서다.
• 어드바이저는 포인트컷( NameMatchMethodPointcut ), 어드바이스( LogTraceAdvice )를 가지고 있다.
• 프록시 팩토리에 각각의 target 과 advisor 를 등록해서 프록시를 생성한다. 그리고 생성된 프록시를
  스프링 빈으로 등록한다.

 

 

3. 실행

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@Import(ProxyFactoryConfigV1.class)
@SpringBootApplication(scanBasePackages = "hello.proxy.app") //주의
public class ProxyApplication {

    public static void main(String[] args) {
        SpringApplication.run(ProxyApplication.class, args);
    }

    @Bean
    public LogTrace logTrace(){
        return new ThreadLocalLogTrace();
    }

}

Proxyfactory proxy=class com.sun.proxy.$Proxy50, target=class hello.proxy.app.v1.OrderRepositoryV1Impl
Proxyfactory proxy=class com.sun.proxy.$Proxy52, target=class hello.proxy.app.v1.OrderServiceV1Impl
Proxyfactory proxy=class com.sun.proxy.$Proxy53, target=class hello.proxy.app.v1.OrderControllerV1Impl
Tomcat started on port(s): 8080 (http) with context path ''
(JVM running for 4.941)
Initializing Spring DispatcherServlet 'dispatcherServlet'
Initializing Servlet 'dispatcherServlet'
Completed initialization in 1 ms
[7e3d056c] OrderControllerV1.request()
[7e3d056c] |-->OrderServiceV1.orderItem()
[7e3d056c] |   |-->OrderRepositoryV1.save()
[7e3d056c] |   |<--OrderRepositoryV1.save() time=1010ms
[7e3d056c] |<--OrderServiceV1.orderItem() time=1012ms
[7e3d056c] OrderControllerV1.request() time=1013ms

• V1 애플리케이션은 인터페이스가 있기 때문에 프록시 팩토리가 JDK 동적 프록시를 적용한다.
• 애플리케이션 로딩 로그를 통해서 JDK 동적 프록시가 적용된 것을 확인할 수 있다.->com.sun.proxy.$Proxy50,

 

 

4. GitHub : 220101 ProxyFactory 1 

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GitHub - bsh6463/Spring_Advanced_2