Feature: 웨이팅 개수 조회 기능 추가

nowait-app-user-api/src/main/java/com/nowait/applicationuser/waiting/controller/WaitingController.java

@@ -3,6 +3,7 @@
 import org.springframework.http.ResponseEntity;
 import org.springframework.security.core.annotation.AuthenticationPrincipal;
 import org.springframework.web.bind.annotation.DeleteMapping;
+import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.PathVariable;
 import org.springframework.web.bind.annotation.PostMapping;
 import org.springframework.web.bind.annotation.RequestBody;
@@ -11,6 +12,7 @@
 
 import com.nowait.applicationuser.waiting.dto.CancelWaitingRequest;
 import com.nowait.applicationuser.waiting.dto.CancelWaitingResponse;
+import com.nowait.applicationuser.waiting.dto.GetWaitingSizeResponse;
 import com.nowait.applicationuser.waiting.dto.RegisterWaitingRequest;
 import com.nowait.applicationuser.waiting.dto.RegisterWaitingResponse;
 import com.nowait.applicationuser.waiting.service.WaitingService;
@@ -77,4 +79,24 @@ public ResponseEntity<?> cancelWaiting(
 				)
 			);
 	}
+
+	@GetMapping("/{publicCode}/waiting-count")
+	@Operation(summary = "대기열 리팩토링용 API", description = "대기 인원수 조회")
+	public ResponseEntity<?> getWaitingCount(
+		@AuthenticationPrincipal CustomOAuth2User customOAuth2User,
+		@PathVariable String publicCode
+	) {
+		GetWaitingSizeResponse response = waitingService.getWaitingCount(
+			customOAuth2User,
+			publicCode
+		);
+
+		return ResponseEntity
+			.ok()
+			.body(
+				ApiUtils.success(
+					response
+				)
+			);
+	}
 }

nowait-app-user-api/src/main/java/com/nowait/applicationuser/waiting/dto/GetWaitingSizeResponse.java

@@ -0,0 +1,11 @@
+package com.nowait.applicationuser.waiting.dto;
+
+import lombok.Builder;
+import lombok.Getter;
+
+@Getter
+@Builder
+public class GetWaitingSizeResponse {
+	private Long storeId;
+	private Long waitingCount;
+}

nowait-app-user-api/src/main/java/com/nowait/applicationuser/waiting/service/WaitingService.java

@@ -10,6 +10,7 @@
 
 import com.nowait.applicationuser.waiting.dto.CancelWaitingRequest;
 import com.nowait.applicationuser.waiting.dto.CancelWaitingResponse;
+import com.nowait.applicationuser.waiting.dto.GetWaitingSizeResponse;
 import com.nowait.applicationuser.waiting.dto.RegisterWaitingRequest;
 import com.nowait.applicationuser.waiting.dto.RegisterWaitingResponse;
 import com.nowait.applicationuser.waiting.dto.WaitingIdempotencyValue;
@@ -147,6 +148,24 @@ public CancelWaitingResponse cancelWaiting(CustomOAuth2User oAuth2User, String p
 			.build();
 	}
 
+	public GetWaitingSizeResponse getWaitingCount(CustomOAuth2User oAuth2User, String publicCode) {
+
+		Store store = storeRepository.findByPublicCodeAndDeletedFalse(publicCode)
+			.orElseThrow(StoreNotFoundException::new);
+
+		User user = userRepository.findById(oAuth2User.getUserId())
+			.orElseThrow(UserNotFoundException::new);
+
+		Long storeId = store.getStoreId();
+
+		Long waitingCount = waitingRedisRepository.getWaitingCount(storeId);
+
+		return GetWaitingSizeResponse.builder()
+			.storeId(storeId)
+			.waitingCount(waitingCount)
+			.build();
+	}
+
 	private String generateWaitingNumber(Long storeId, LocalDateTime timestamp) {
 		// 1) 키 접두사 - 날짜
 		String today = timestamp.format(DateTimeFormatter.BASIC_ISO_DATE); // YYYYMMDD

nowait-domain/domain-redis/src/main/java/com/nowait/domaincoreredis/reservation/repository/WaitingRedisRepository.java

@@ -209,6 +209,13 @@ public Long getWaitingRank(Long storeId, Long userId) {
 		return redisTemplate.opsForZSet().rank(queueKey, String.valueOf(userId));
 	}
 
+	public Long getWaitingCount(Long storeId) {
+		String queueKey = RedisKeyUtils.buildWaitingKeyPrefix() + storeId;
+		Long size = redisTemplate.opsForZSet().zCard(queueKey);
+
+		return size != null ? size : 0L;
+	}
+
 	// 웨이팅 여부 조회
 	// TODO: 구현 필요
 	public Boolean isWaiting(Long storeId, Long userId) {