Fix/release

backend/.gitignore

@@ -43,4 +43,4 @@ db_dev.trace.db
 ### yml
 /src/main/resources/application-secret.yml
 apiV1.json
-.env
+.env

backend/build.gradle

@@ -80,6 +80,7 @@ dependencies {
 	// 모니터링
 	implementation 'org.springframework.boot:spring-boot-starter-actuator'
 	implementation 'io.micrometer:micrometer-registry-prometheus'
+	implementation 'io.prometheus:prometheus-metrics-model:1.0.0'
 }
 
 tasks.named('test') {

backend/src/main/java/com/Catch_Course/domain/payments/entity/PaymentOutbox.java

@@ -0,0 +1,42 @@
+package com.Catch_Course.domain.payments.entity;
+
+import jakarta.persistence.*;
+import lombok.AccessLevel;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import org.springframework.data.annotation.CreatedDate;
+import org.springframework.data.jpa.domain.support.AuditingEntityListener;
+
+import java.time.LocalDateTime;
+
+@Entity
+@Getter
+@NoArgsConstructor(access = AccessLevel.PROTECTED)
+@EntityListeners(AuditingEntityListener.class)
+public class PaymentOutbox {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    @Column(nullable = false)
+    private Long aggregateId;
+
+    @Column(nullable = false)
+    private String aggregateType;
+
+    @Column(columnDefinition = "TEXT", nullable = false)
+    private String payload;
+
+    @CreatedDate
+    @Column(updatable = false)
+    private LocalDateTime createdAt;
+
+    @Builder
+    public PaymentOutbox(Long aggregateId, String aggregateType, String payload) {
+        this.aggregateId = aggregateId;
+        this.aggregateType = aggregateType;
+        this.payload = payload;
+    }
+}

backend/src/main/java/com/Catch_Course/domain/payments/repository/PaymentOutboxRepository.java

@@ -0,0 +1,10 @@
+package com.Catch_Course.domain.payments.repository;
+
+import com.Catch_Course.domain.payments.entity.PaymentOutbox;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import java.util.List;
+
+public interface PaymentOutboxRepository extends JpaRepository<PaymentOutbox, Long> {
+    List<PaymentOutbox> findTop100ByOrderByCreatedAtAsc();
+}

backend/src/main/java/com/Catch_Course/domain/payments/service/OutboxScheduler.java

@@ -0,0 +1,52 @@
+package com.Catch_Course.domain.payments.service;
+
+import com.Catch_Course.domain.payments.entity.PaymentOutbox;
+import com.Catch_Course.domain.payments.repository.PaymentOutboxRepository;
+import com.Catch_Course.global.kafka.dto.PaymentCancelRequest;
+import com.Catch_Course.global.kafka.producer.PaymentCancelProducer;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.scheduling.annotation.Scheduled;
+import org.springframework.stereotype.Component;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.util.List;
+
+@Slf4j
+@Component
+@RequiredArgsConstructor
+public class OutboxScheduler {
+
+    private final PaymentOutboxRepository paymentOutboxRepository;
+    private final PaymentCancelProducer paymentCancelProducer;
+    private final ObjectMapper objectMapper;
+
+    // 10초마다 실행 (fixedDelayString = "10000")
+    @Scheduled(fixedDelay = 10000)
+    @Transactional
+    public void pollAndPublish() {
+        List<PaymentOutbox> events = paymentOutboxRepository.findTop100ByOrderByCreatedAtAsc();
+        if (events.isEmpty()) {
+            return;
+        }
+
+        log.info("[Outbox] 미처리 이벤트 {}건을 조회했습니다. 메시지 발행을 시작합니다.", events.size());
+
+        for (PaymentOutbox event : events) {
+            try {
+                // 2. 페이로드를 역직렬화
+                PaymentCancelRequest payload = objectMapper.readValue(event.getPayload(), PaymentCancelRequest.class);
+
+                // 3. 메시지 발행
+                paymentCancelProducer.send(payload);
+
+                // 4. 아웃박스 테이블에서 삭제
+                paymentOutboxRepository.delete(event);
+
+            } catch (Exception e) {
+                log.error("[Outbox] 이벤트 처리 실패. eventId: {}. 에러: {}", event.getId(), e.getMessage());
+            }
+        }
+    }
+}

backend/src/main/java/com/Catch_Course/domain/payments/service/PaymentService.java

@@ -3,7 +3,9 @@
 import com.Catch_Course.domain.member.entity.Member;
 import com.Catch_Course.domain.payments.dto.PaymentDto;
 import com.Catch_Course.domain.payments.entity.Payment;
+import com.Catch_Course.domain.payments.entity.PaymentOutbox;
 import com.Catch_Course.domain.payments.entity.PaymentStatus;
+import com.Catch_Course.domain.payments.repository.PaymentOutboxRepository;
 import com.Catch_Course.domain.payments.repository.PaymentRepository;
 import com.Catch_Course.domain.reservation.entity.Reservation;
 import com.Catch_Course.domain.reservation.entity.ReservationStatus;
@@ -12,9 +14,9 @@
 import com.Catch_Course.global.kafka.dto.PaymentCancelRequest;
 import com.Catch_Course.global.kafka.producer.PaymentCancelProducer;
 import com.Catch_Course.global.payment.TossPaymentsService;
+import com.fasterxml.jackson.databind.ObjectMapper;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
-import org.springframework.context.ApplicationEventPublisher;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Propagation;
 import org.springframework.transaction.annotation.Transactional;
@@ -35,7 +37,8 @@ public class PaymentService {
     private final ReservationRepository reservationRepository;
     private final TossPaymentsService tossPaymentsService;
     private final PaymentCancelProducer paymentCancelProducer;
-    private final ApplicationEventPublisher eventPublisher;
+    private final PaymentOutboxRepository paymentOutboxRepository;
+    private final ObjectMapper objectMapper;
 
     public PaymentDto getPayment(Member member, Long reservationId) {
 
@@ -149,13 +152,24 @@ public PaymentDto deletePaymentRequest(Member member, Long reservationId) {
             throw new ServiceException("409-2", "이미 취소된 결제입니다.");
         }
 
-        // 취소 요청 상태
+        // DB 상태 변경
         payment.setStatus(PaymentStatus.CANCEL_REQUESTED);
+        paymentRepository.save(payment);
 
-        // 메세지 직접 발행 대신 내부 이벤트로 발행
         String cancelReason = "고객 요청";
-        PaymentCancelRequest request = new PaymentCancelRequest(payment, cancelReason, reservation, member);
-        eventPublisher.publishEvent(request);
+        PaymentCancelRequest requestPayload = new PaymentCancelRequest(payment, cancelReason, reservation, member);
+
+        try {
+            String payloadJson = objectMapper.writeValueAsString(requestPayload);
+            PaymentOutbox outboxEvent = PaymentOutbox.builder()
+                    .aggregateId(payment.getId())
+                    .aggregateType("PAYMENT_CANCEL")
+                    .payload(payloadJson)
+                    .build();
+            paymentOutboxRepository.save(outboxEvent);
+        } catch (Exception e) {
+            throw new RuntimeException("Outbox payload 직렬화에 실패했습니다.", e);
+        }
 
         return new PaymentDto(paymentRepository.save(payment));
     }

backend/src/main/resources/application.yml

@@ -71,4 +71,4 @@ spring:
 app:
   registration-time:
     start: "09:00"
-    duration-in-minutes: 900
+    duration-in-minutes: 1080

backend/src/test/java/com/Catch_Course/domain/reservation/controller/ReservationControllerTest.java

@@ -35,7 +35,9 @@
 import java.util.List;
 import java.util.function.Supplier;
 
+import static java.util.concurrent.TimeUnit.SECONDS;
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.awaitility.Awaitility.await;
 import static org.hamcrest.Matchers.*;
 import static org.mockito.Mockito.when;
 import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.*;
@@ -229,14 +231,28 @@ void cancelReservation() throws Exception {
     @DisplayName("수강 취소 실패 - 이미 취소")
     void cancelReservation2() throws Exception {
         Long courseId = 1L;
-        cancelReservation();    // 수강 취소
-        Thread.sleep(1000);
+        cancelReservation();
 
+        // then 1: DB에서 방금 생성된 예약을 직접 조회하여 ID를 확보
+        Course course = courseService.findById(courseId);
+        Reservation reservation = reservationRepository.findByStudentAndCourse(loginedMember, course)
+                .orElseThrow(() -> new AssertionError("테스트 예약을 찾을 수 없습니다."));
+        Long reservationId = reservation.getId();
+
+        // then 2: Awaitility를 사용해 비동기 처리가 완료될 때까지 대기
+        await().atMost(5, SECONDS).untilAsserted(() -> {
+            Reservation updatedReservation = reservationRepository.findById(reservationId)
+                    .orElseThrow(() -> new AssertionError("예약을 찾을 수 없습니다."));
+            assertThat(updatedReservation.getStatus()).isEqualTo(ReservationStatus.CANCELLED);
+        });
+
+        // when 2: 두 번째 수강 취소 요청
         ResultActions resultActions = mvc.perform(
                 delete("/api/reserve?courseId=%d".formatted(courseId))
                         .header("Authorization", "Bearer " + token)
         ).andDo(print());
 
+        // then 3: 최종 결과 검증
         resultActions
                 .andExpect(status().isConflict())
                 .andExpect(jsonPath("$.code").value("409-5"))