SpringSpring 고급편ThreadLocal

Spring 핵심원리 고급편 - 필드 동기화 적용

목차

필드 동기화 적용

Bean 으로 등록

@Configuration 
public class LogTraceConfig {
    @Bean     
    public LogTrace logTrace() {         
        return new FieldLogTrace();     
    } 
}
@RestController
@RequiredArgsConstructor
public class OrderControllerV3 {

    private final OrderServiceV3 orderService;
    private final LogTrace trace;

    @GetMapping("/v3/request")
    public String request(String itemId){

        System.out.println(itemId);

        TraceStatus status = null;
        try {
            status = trace.begin("OrderController.request()");
            orderService.orderItem(itemId);
            trace.end(status);

            return "ok";
        }catch (Exception e){
            trace.exception(status, e);
            throw e; // 예외를 반드시 던져 줘야 한다.
        }
    }
}
@Service
@RequiredArgsConstructor
public class OrderServiceV3 {

    private final OrderRepositoryV3 orderRepository;
    private final LogTrace trace;

    public void orderItem (String itemId){
        TraceStatus status = null;
        try {
            status = trace.begin("OrderService.orderItem()");
            orderRepository.save(itemId);
            trace.end(status);

        }catch (Exception e){
            trace.exception(status, e);
            throw e; // 예외를 반드시 던져 줘야 한다.
        }
    }
}
@Repository
@RequiredArgsConstructor
public class OrderRepositoryV3 {

    private final LogTrace trace;

    public void save(String itemId){

        TraceStatus status = null;
        try {
            status = trace.begin("OrderRepository.save()");

            // 저장 로직
            if(itemId.equals("ex")){
                throw new IllegalStateException("예외 발생!");
            }
            sleep(1000);

            trace.end(status);
        }catch (Exception e){
            trace.exception(status, e);
            throw e; // 예외를 반드시 던져 줘야 한다.
        }
    }

    private void sleep(int millis) {
        try{
            Thread.sleep(millis);
        }catch (InterruptedException e){
            e.printStackTrace();
        }
    }
}
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