[스프링 핵심원리 - 고급편 ] 필드 동기화 - 적용

LogTraceConfig.java

FieldLogTrace 스프링에 빈으로 등록해야 한다.

@Configuration
public class LogTraceConfig {

	@Bean
	public LogTrace logTrace() {
		return new FieldLogTrace(); //싱글톤으로 등록
	}
	
}

OrderControllerV3.java

package study.advanced.app.v3;

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import lombok.RequiredArgsConstructor;
import study.advanced.trace.TraceStatus;
import study.advanced.trace.logtrace.LogTrace;

@RestController
@RequiredArgsConstructor
public class OrderControllerV3 {

	private final OrderServiceV3 orderService;
	private final LogTrace trace;
	
	@GetMapping("/v3/request") //요청이 오면 아래 메서드가 호출
	public String request(String itemId) {
		
		TraceStatus status = null;
		
		//예외가 되더라도 로그가 되게끔 try처리
		try {
	    status = trace.begin("OrderController.request()");
		orderService.orderItem(itemId);
		trace.end(status);
		return "ok";
		
		}catch (Exception e) {	
			trace.exception(status, e);
			throw e; // 예외를꼭 다시 던져주어야 한다. 
		}	
	}
}

OrderServiceV3.java

package study.advanced.app.v3;

import org.springframework.stereotype.Service;

import lombok.RequiredArgsConstructor;
import study.advanced.trace.TraceStatus;
import study.advanced.trace.logtrace.LogTrace;

@Service
@RequiredArgsConstructor
public class OrderServiceV3 {

	private final OrderRepositoryV3 orderRepository;
	private final LogTrace trace;

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

		// 예외가 되더라도 로그가 되게끔 try처리
		try {
			status = trace.begin("OrderService.orderItem()");
			orderRepository.save(itemId);
			trace.end(status);
			

		} catch (Exception e) {
			trace.exception(status, e);
			throw e; 
		}
		
	}

}

OrderRepositoryV3.java

package study.advanced.app.v3;

import org.springframework.stereotype.Repository;

import lombok.RequiredArgsConstructor;
import study.advanced.trace.TraceStatus;
import study.advanced.trace.logtrace.LogTrace;

@Repository
@RequiredArgsConstructor
public class OrderRepositoryV3 {

	private final LogTrace trace;
	
	
	public void save(String itemId) {
		
		TraceStatus status = null;
		
		try {
			status = trace.begin("OrderRepository.save()");
			//저장로직
			if(itemId.equals("ex")) {
				throw new IllegalStateException("예외발생");
			}
			//상품저장에 1초
			sleep(1000);
			trace.end(status);
			
		}catch(Exception e) {
			trace.exception(status, e);
			throw e;
		}
	
		
	}

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

로그가 제대로 나오는걸 확인할 수 있다.!