스프링 핵심 원리 고급편(AOP 포함)(작성중)

JPA Advance

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 2024/01/09   Share

왜?

AOP 등등 다양한 기술을 spring 에 접목하기위함
크게 5가지 기술과 디자인 패턴한다.
- 쓰레드 로컬
- 패턴들(템플릿 메서드 패턴, 콜백 패턴, 프록시 패턴, 데코레이터 패턴)
- 동적 프록시 기술
- 빈 후처리
- AOP

로그추적기

V0 (가장 단순한 구조) C-S-R

@RestController
@RequiredArgsConstructor
public class OrderControllerV0 {

    private final OrderServiceV0 orderService;

    @GetMapping("/v0/request")
    public String request(String itemId) {
        orderService.orderItem(itemId);
        return "ok";
    }
}

@Service
@RequiredArgsConstructor
public class OrderServiceV0 {

    private final OrderRepositoryV0 orderRepository;

    public void orderItem(String itemId) {
        orderRepository.save(itemId);
    }
}

@Repository
@RequiredArgsConstructor
public class OrderRepositoryV0 {

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

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

로그 추적기 V1

traceId

package hello.advanced.trace;

import java.util.UUID;

public class TraceId {

    private String id;
    private int level;

    public TraceId() {
        this.id = createId();
        this.level = 0;
    }

    private TraceId(String id, int level) {
        this.id = id;
        this.level = level;
    }

    private String createId() {
        return UUID.randomUUID().toString().substring(0, 8);
    }

    public TraceId createNextId() {
        return new TraceId(id, level + 1);
    }

    public TraceId createPreviousId() {
        return new TraceId(id, level - 1);
    }

    public boolean isFirstLevel() {
        return level == 0;
    }

    public String getId() {
        return id;
    }

    public int getLevel() {
        return level;
    }
}

traceStatus

package hello.advanced.trace;

public class TraceStatus {

    private TraceId traceId;
    private Long startTimeMs;
    private String message;

    public TraceStatus(TraceId traceId, Long startTimeMs, String message) {
        this.traceId = traceId;
        this.startTimeMs = startTimeMs;
        this.message = message;
    }

    public TraceId getTraceId() {
        return traceId;
    }

    public Long getStartTimeMs() {
        return startTimeMs;
    }

    public String getMessage() {
        return message;
    }
}

helloTraceV1

@Slf4j
@Component
public class HelloTraceV1 {

    private static final String START_PREFIX = "-->";
    private static final String COMPLETE_PREFIX = "<--";
    private static final String EX_PREFIX = "<X-";

    public TraceStatus begin(String message) {
        TraceId traceId = new TraceId();
        Long startTimeMs = System.currentTimeMillis();
        log.info("[{}] {}{}", traceId.getId(), addSpace(START_PREFIX, traceId.getLevel()), message);
        return new TraceStatus(traceId, startTimeMs, message);
    }

    public void end(TraceStatus status) {
        complete(status, null);
    }

    public void exception(TraceStatus status, Exception e) {
        complete(status, e);
    }

    private void complete(TraceStatus status, Exception e) {
        Long stopTimeMs = System.currentTimeMillis();
        long resultTimeMs = stopTimeMs - status.getStartTimeMs();
        TraceId traceId = status.getTraceId();
        if (e == null) {
            log.info("[{}] {}{} time={}ms", traceId.getId(), addSpace(COMPLETE_PREFIX, traceId.getLevel()), status.getMessage(), resultTimeMs);
        } else {
            log.info("[{}] {}{} time={}ms ex={}", traceId.getId(), addSpace(EX_PREFIX, traceId.getLevel()), status.getMessage(), resultTimeMs, e.toString());
        }
    }

    private static String addSpace(String prefix, int level) {
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < level; i++) {
            sb.append((i == level - 1) ? "|" + prefix : "|   ");
        }
        return sb.toString();
    }

}

HelloTraceV1Test

public class HelloTraceV1Test {

    @Test
    void begin_end() {
        HelloTraceV1 trace = new HelloTraceV1();
        TraceStatus status = trace.begin("hello");
        trace.end(status);
    }

    @Test
    void begin_exception() {
        HelloTraceV1 trace = new HelloTraceV1();
        TraceStatus status = trace.begin("hello");
        trace.exception(status, new IllegalStateException());
    }
}

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CATALOG

1. 왜?
2. 로그추적기
3. V0 (가장 단순한 구조) C-S-R
4. 로그 추적기 V1



缺失模块。
1、请确保node版本大于6.2
2、在博客根目录（注意不是archer根目录）执行以下命令：
npm i hexo-generator-json-content --save
3、在根目录_config.yml里添加配置：

jsonContent:
  meta: false
  pages: false
  posts:
    title: true
    date: true
    path: true
    text: false
    raw: false
    content: false
    slug: false
    updated: false
    comments: false
    link: false
    permalink: false
    excerpt: false
    categories: true
    tags: true