feat: 최대 집중시간 제한(3시간) 설정 및 좀비 세션 스케줄러 삭제

src/main/java/com/gpt/geumpumtabackend/study/api/StudySessionApi.java

@@ -9,6 +9,7 @@
 import com.gpt.geumpumtabackend.study.dto.request.HeartBeatRequest;
 import com.gpt.geumpumtabackend.study.dto.request.StudyEndRequest;
 import com.gpt.geumpumtabackend.study.dto.request.StudyStartRequest;
+import com.gpt.geumpumtabackend.study.dto.response.HeartBeatResponse;
 import com.gpt.geumpumtabackend.study.dto.response.StudySessionResponse;
 import com.gpt.geumpumtabackend.study.dto.response.StudyStartResponse;
 import io.swagger.v3.oas.annotations.Operation;
@@ -147,8 +148,7 @@ ResponseEntity<ResponseBody<Void>> endStudySession(
             🔄 **동작 원리:**
             1. Wi-Fi 연결 상태 재검증 (Gateway IP + IP 대역 확인)
             2. 클라이언트 실제 IP 주소 재확인 (서버에서 추출)
-            3. 세션의 lastHeartBeatAt 시간 업데이트
-            4. 90초 이상 하트비트 없으면 좀비 세션으로 분류
+            3. 
 
             🚨 **실패 시 대응:**
             - Wi-Fi 연결 끊김: 재연결 후 다시 `/start` 호출
@@ -170,7 +170,7 @@ ResponseEntity<ResponseBody<Void>> endStudySession(
     @PostMapping("/heart-beat")
     @AssignUserId  
     @PreAuthorize("isAuthenticated() and hasRole('USER')")
-    ResponseEntity<ResponseBody<Void>> processHeartBeat(
+    ResponseEntity<ResponseBody<HeartBeatResponse>> processHeartBeat(
             @Valid @RequestBody HeartBeatRequest heartBeatRequest,
             @Parameter(hidden = true) Long userId);
 }

src/main/java/com/gpt/geumpumtabackend/study/controller/StudySessionController.java

@@ -7,6 +7,7 @@
 import com.gpt.geumpumtabackend.study.dto.request.HeartBeatRequest;
 import com.gpt.geumpumtabackend.study.dto.request.StudyEndRequest;
 import com.gpt.geumpumtabackend.study.dto.request.StudyStartRequest;
+import com.gpt.geumpumtabackend.study.dto.response.HeartBeatResponse;
 import com.gpt.geumpumtabackend.study.dto.response.StudySessionResponse;
 import com.gpt.geumpumtabackend.study.dto.response.StudyStartResponse;
 import com.gpt.geumpumtabackend.study.service.StudySessionService;
@@ -64,8 +65,7 @@ public ResponseEntity<ResponseBody<Void>> endStudySession(@Valid @RequestBody St
     @PostMapping("/heart-beat")
     @PreAuthorize("isAuthenticated() and hasRole('USER')")
     @AssignUserId
-    public ResponseEntity<ResponseBody<Void>> processHeartBeat(@Valid @RequestBody HeartBeatRequest heartBeatRequest, Long userId){
-        studySessionService.updateHeartBeat(heartBeatRequest, userId);
-        return ResponseEntity.ok(ResponseUtil.createSuccessResponse());
+    public ResponseEntity<ResponseBody<HeartBeatResponse>> processHeartBeat(@Valid @RequestBody HeartBeatRequest heartBeatRequest, Long userId){
+        return ResponseEntity.ok(ResponseUtil.createSuccessResponse(studySessionService.updateHeartBeat(heartBeatRequest, userId)));
     }
 }

src/main/java/com/gpt/geumpumtabackend/study/dto/response/HeartBeatResponse.java

@@ -0,0 +1,4 @@
+package com.gpt.geumpumtabackend.study.dto.response;
+
+public record HeartBeatResponse(boolean sessionActive, String message) {
+}

src/main/java/com/gpt/geumpumtabackend/study/service/StudySessionService.java

@@ -6,6 +6,7 @@
 import com.gpt.geumpumtabackend.study.dto.request.HeartBeatRequest;
 import com.gpt.geumpumtabackend.study.dto.request.StudyEndRequest;
 import com.gpt.geumpumtabackend.study.dto.request.StudyStartRequest;
+import com.gpt.geumpumtabackend.study.dto.response.HeartBeatResponse;
 import com.gpt.geumpumtabackend.study.dto.response.StudySessionResponse;
 import com.gpt.geumpumtabackend.study.dto.response.StudyStartResponse;
 import com.gpt.geumpumtabackend.study.repository.StudySessionRepository;
@@ -19,6 +20,7 @@
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
+import java.time.Duration;
 import java.time.LocalDate;
 import java.time.LocalDateTime;
 
@@ -30,7 +32,7 @@ public class StudySessionService {
     private final StudySessionRepository studySessionRepository;
     private final UserRepository userRepository;
     private final CampusWiFiValidationService wifiValidationService;
-
+    private static final Integer MAX_FOCUS_TIME = 3;
     /*
     메인 홈
      */
@@ -81,7 +83,7 @@ public void endStudySession(StudyEndRequest request, Long userId) {
     하트비트 처리
      */
     @Transactional
-    public void updateHeartBeat(HeartBeatRequest heartBeatRequest, Long userId) {
+    public HeartBeatResponse updateHeartBeat(HeartBeatRequest heartBeatRequest, Long userId) {
         Long sessionId = heartBeatRequest.sessionId();
 
         // Wi-Fi 검증 (캐시 우선 사용)
@@ -98,7 +100,14 @@ public void updateHeartBeat(HeartBeatRequest heartBeatRequest, Long userId) {
         // 유효하면 해당 세션의 lastHeartBeatAt 시간을 now()로 갱신한다.
         StudySession studySession = studySessionRepository.findByIdAndUser_Id(sessionId, userId)
                 .orElseThrow(()->new BusinessException(ExceptionType.STUDY_SESSION_NOT_FOUND));
+
+        Duration elapsed = Duration.between(studySession.getStartTime(), LocalDateTime.now());
+        if(elapsed.compareTo(Duration.ofHours(MAX_FOCUS_TIME)) >= 0) {
+            studySession.endStudySession(studySession.getStartTime().plusHours(MAX_FOCUS_TIME));
+            return new HeartBeatResponse(false, "최대 집중시간은 3시간입니다.");
+        }
         studySession.updateHeartBeatAt(LocalDateTime.now());
+        return new HeartBeatResponse(true,"정상 세션");
     }
 
     private BusinessException mapWiFiValidationException(WiFiValidationResult result) {