SpringSpring 고급편Decorator 패턴

Spring 핵심원리 고급편 - 인터페이스 프록시 1

목차

@RequiredArgsConstructor
public class OrderRepositoryInterfaceProxy implements OrderRepositoryV1 {

    // 실제 객체 참조
    private final OrderRepositoryV1 target;
    private final LogTrace logTrace;

    @Override
    public void save(String itemId) {
        TraceStatus status = null;

        try{
            status = logTrace.begin("OrderRepository.request()");
            // target 호출
            target.save(itemId);
            logTrace.end(status);
        }catch (Exception ex){
            logTrace.exception(status, ex);
            throw ex;
        }
    }
}
@RequiredArgsConstructor
public class OrderServiceInterfaceProxy implements OrderServiceV1 {

    private final OrderServiceV1 target;
    private final LogTrace logTrace;

    @Override
    public void orderItem(String itemId) {
        TraceStatus status = null;

        try{
            status = logTrace.begin("OrderService.orderItem()");
            // target 호출
            target.orderItem(itemId);
            logTrace.end(status);
        }catch (Exception ex){
            logTrace.exception(status, ex);
            throw ex;
        }
    }
}
@RequiredArgsConstructor
public class OrderControllerInterfaceProxy implements OrderControllerV1 {

    private final OrderControllerV1 target;
    private final LogTrace logTrace;

    @Override
    public String request(String itemId) {
        TraceStatus status = null;

        try{
            status = logTrace.begin("OrderController.request()");
            // target 호출
            String result = target.request(itemId);
            logTrace.end(status);

            return result;
        }catch (Exception ex){
            logTrace.exception(status, ex);
            throw ex;
        }
    }

    @Override
    public String noLog() {
        return target.noLog();
    }
}

Proxy Bean 등록


@Configuration
public class InterfaceProxyConfig {

    @Bean
    public OrderControllerV1 orderController(LogTrace logTrace){
        OrderControllerV1Impl controllerImpl = new OrderControllerV1Impl(orderService(logTrace));
        return new OrderControllerInterfaceProxy(controllerImpl, logTrace);
    }

    @Bean
    public OrderServiceV1 orderService(LogTrace logTrace){
        OrderServiceV1Impl orderServiceImpl = new OrderServiceV1Impl(orderRepository(logTrace));
        return new OrderServiceInterfaceProxy(orderServiceImpl, logTrace);
    }

    @Bean
    public OrderRepositoryV1 orderRepository(LogTrace logTrace){
        OrderRepositoryV1 orderRepositoryImpl = new OrderRepositoryV1Impl();
        return new OrderRepositoryInterfaceProxy(orderRepositoryImpl, logTrace);
    }
}
//@Import(AppV1Config.class)
//@Import({AppV1Config.class, AppV2Config.class})
@Import(InterfaceProxyConfig.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();
    }
}
2021-11-28 13:54:09.793  INFO 97198 --- [nio-8080-exec-2] h.p.trace.logtrace.ThreadLocalLogTrace   : [86b4baba] OrderController.request()
2021-11-28 13:54:09.795  INFO 97198 --- [nio-8080-exec-2] h.p.trace.logtrace.ThreadLocalLogTrace   : [86b4baba] |-->OrderService.orderItem()
2021-11-28 13:54:09.795  INFO 97198 --- [nio-8080-exec-2] h.p.trace.logtrace.ThreadLocalLogTrace   : [86b4baba] |   |-->OrderRepository.request()
2021-11-28 13:54:10.798  INFO 97198 --- [nio-8080-exec-2] h.p.trace.logtrace.ThreadLocalLogTrace   : [86b4baba] |   |<--OrderRepository.request() time=1003ms
2021-11-28 13:54:10.798  INFO 97198 --- [nio-8080-exec-2] h.p.trace.logtrace.ThreadLocalLogTrace   : [86b4baba] |<--OrderService.orderItem() time=1003ms
2021-11-28 13:54:10.798  INFO 97198 --- [nio-8080-exec-2] h.p.trace.logtrace.ThreadLocalLogTrace   : [86b4baba] OrderController.request() time=1005ms
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