[FEATURE] 소속 센터에 등록된 어르신 수 api

src/main/java/young/blaybus/domain/center/controller/CenterController.java

@@ -13,6 +13,7 @@
 import young.blaybus.domain.center.controller.response.GetCenter;
 import young.blaybus.domain.center.controller.response.GetCenterDetailInforResponse;
 import young.blaybus.domain.center.controller.response.GetCenterResponse;
+import young.blaybus.domain.center.controller.response.GetSeniorCountResponse;
 import young.blaybus.domain.center.service.CenterService;
 
 @RestController
@@ -70,4 +71,16 @@ public ApiResponse<GetCenterDetailInforResponse> getCenterDetailInfor(@RequestPa
     return ApiResponse.onSuccess(centerService.getCenterDetailInfor(centerName));
   }
 
+  @GetMapping("/center/count")
+  @Operation(summary = "소속 센터에 등록된 어르신 수")
+  @ApiResponses(value = {
+          @io.swagger.v3.oas.annotations.responses.ApiResponse(
+                  responseCode = "200",
+                  content = @Content(schema = @Schema(implementation = GetSeniorCountResponse.class))
+          )
+  })
+  public ApiResponse<GetSeniorCountResponse> getSeniorCount() {
+    return ApiResponse.onSuccess(centerService.getSeniorCount());
+  }
+
 }

src/main/java/young/blaybus/domain/center/controller/response/GetSeniorCountResponse.java

@@ -0,0 +1,18 @@
+package young.blaybus.domain.center.controller.response;
+
+import io.swagger.v3.oas.annotations.media.Schema;
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.ToString;
+
+@Getter
+@Builder
+@ToString
+@AllArgsConstructor
+@Schema(description = "소속 센터에 등록된 어르신 수 응답 객체")
+public class GetSeniorCountResponse {
+
+    @Schema(description = "어르신 수")
+    private int seniorCount;
+}

src/main/java/young/blaybus/domain/center/service/CenterService.java

@@ -8,19 +8,27 @@
 import young.blaybus.domain.center.controller.response.GetCenter;
 import young.blaybus.domain.center.controller.response.GetCenterDetailInforResponse;
 import young.blaybus.domain.center.controller.response.GetCenterResponse;
+import young.blaybus.domain.center.controller.response.GetSeniorCountResponse;
 import young.blaybus.domain.center.repository.CenterRepository;
 import young.blaybus.domain.member.Member;
 import young.blaybus.domain.member.controller.request.CreateAdminRequest;
+import young.blaybus.domain.member.repository.MemberRepository;
+import young.blaybus.domain.member.security.SecurityUtils;
+import young.blaybus.domain.senior.Senior;
+import young.blaybus.domain.senior.repository.SeniorRepository;
 
 import java.time.LocalDateTime;
 import java.util.List;
 import java.util.Optional;
+import java.util.concurrent.atomic.AtomicInteger;
 
 @Service
 @RequiredArgsConstructor
 public class CenterService {
 
     private final CenterRepository centerRepository;
+    private final MemberRepository memberRepository;
+    private final SeniorRepository seniorRepository;
 
     // 센터 등록
     @Transactional
@@ -102,5 +110,23 @@ public GetCenter isRegistrationCenterByName(String name) {
         return new GetCenter("해당 센터는 현재 등록되어 있지 않습니다.", false);
     }
 
+    // 소속 센터에 등록된 어르신 수
+    public GetSeniorCountResponse getSeniorCount() {
+        String adminId = SecurityUtils.getCurrentMemberName();
+        Optional<Member> member = memberRepository.findById(adminId);
+
+        AtomicInteger seniorCount = new AtomicInteger();
+        if (member.isPresent()) {
+            Center center = centerRepository.findById(member.get().getCenter().getId()).orElse(null);
+            if (center != null) {
+                List<Senior> senior = seniorRepository.findByCenterId(center.getId());
+                senior.forEach(s -> seniorCount.getAndIncrement());
+            }
+        }
+
+        return GetSeniorCountResponse.builder()
+                .seniorCount(seniorCount.get())
+                .build();
+    }
 
 }