BE/#299 구인 게시글에 조회수 기능 추가

backend/src/main/java/com/graphy/backend/domain/recruitment/controller/RecruitmentController.java

@@ -18,12 +18,16 @@
 import lombok.RequiredArgsConstructor;
 import org.springframework.data.domain.Pageable;
 import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseCookie;
 import org.springframework.http.ResponseEntity;
 import org.springframework.validation.annotation.Validated;
 import org.springframework.web.bind.annotation.*;
 
+import javax.servlet.http.HttpServletRequest;
 import java.util.List;
 
+import static org.springframework.http.HttpHeaders.SET_COOKIE;
+
 @Tag(name = "RecruitmentController", description = "프로젝트 구인 게시글 관련 API")
 @RestController
 @RequestMapping("api/v1/recruitments")
@@ -42,9 +46,14 @@ public ResponseEntity<ResultResponse> recruitmentAdd(@Validated @RequestBody Cre
 
     @Operation(summary = "findRecruitment", description = "구인 게시글 상세 조회")
     @GetMapping("/{recruitmentId}")
-    public ResponseEntity<ResultResponse> recruitmentDetails(@PathVariable Long recruitmentId) {
+    public ResponseEntity<ResultResponse> recruitmentDetails(@PathVariable Long recruitmentId,
+                                                             HttpServletRequest request) {
         GetRecruitmentDetailResponse result = recruitmentService.findRecruitmentById(recruitmentId);
-        return ResponseEntity.ok(ResultResponse.of(ResultCode.RECRUITMENT_GET_SUCCESS, result));
+        ResponseCookie cookie = recruitmentService.addViewCount(request, recruitmentId);
+
+        return ResponseEntity.ok()
+                .header(SET_COOKIE, cookie.toString())
+                .body(ResultResponse.of(ResultCode.RECRUITMENT_GET_SUCCESS, result));
     }
 
     /**

backend/src/main/java/com/graphy/backend/domain/recruitment/domain/Recruitment.java

@@ -60,6 +60,11 @@ public class Recruitment extends BaseEntity {
     @Embedded
     private RecruitmentTags recruitmentTags;
 
+    @Column(nullable = false)
+    private int viewCount = 0;
+    public void addViewCount() {
+        this.viewCount++;
+    }
     public void addTag(Tags tags) {
         recruitmentTags.add(this, tags);
     }

backend/src/main/java/com/graphy/backend/domain/recruitment/dto/response/GetRecruitmentDetailResponse.java

@@ -30,10 +30,13 @@ public class GetRecruitmentDetailResponse {
 
     private Position position;
 
-    private Integer recruitmentCount;
+    private int recruitmentCount;
+
+    private int viewCount;
 
     private List<String> techTags;
 
+
     public static GetRecruitmentDetailResponse from(Recruitment recruitment) {
         return GetRecruitmentDetailResponse.builder()
                 .id(recruitment.getId())
@@ -44,6 +47,7 @@ public static GetRecruitmentDetailResponse from(Recruitment recruitment) {
                 .period(recruitment.getPeriod())
                 .position(recruitment.getPosition())
                 .recruitmentCount(recruitment.getRecruitmentCount())
+                .viewCount(recruitment.getViewCount())
                 .techTags(recruitment.getTagNames())
                 .build();
     }

backend/src/main/java/com/graphy/backend/domain/recruitment/service/RecruitmentService.java

@@ -19,16 +19,21 @@
 import lombok.RequiredArgsConstructor;
 import org.springframework.data.domain.Page;
 import org.springframework.data.domain.Pageable;
+import org.springframework.http.ResponseCookie;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
+import javax.servlet.http.Cookie;
+import javax.servlet.http.HttpServletRequest;
+import java.util.Arrays;
 import java.util.List;
 import java.util.stream.Collectors;
 
 @Service
 @RequiredArgsConstructor
 @Transactional(readOnly = true)
 public class RecruitmentService {
+    private static final String VIEW_COUNT_COOKIE_NAME = "View_Count";
     private final RecruitmentRepository recruitmentRepository;
     private final RecruitmentTagService recruitmentTagService;
     private final ApplicationRepository applicationRepository;
@@ -97,4 +102,46 @@ public List<GetApplicationResponse> findApplicationList(Long recruitmentId, Page
                 .map(GetApplicationResponse::from)
                 .collect(Collectors.toList());
     }
+
+    @Transactional
+    public ResponseCookie addViewCount(HttpServletRequest request, Long recruitmentId) {
+        Recruitment recruitment = getRecruitmentById(recruitmentId);
+        Cookie viewCountCookie = getViewCountCookie(request);
+
+        if (viewCountCookie == null) viewCountCookie = createViewCountCookie(recruitment);
+        else if (isRequestForNewRecruitment(recruitmentId, viewCountCookie)) {
+            updateViewCount(recruitment, viewCountCookie, recruitmentId);
+        }
+
+        return ResponseCookie.from(viewCountCookie.getName(), viewCountCookie.getValue())
+                .path(viewCountCookie.getPath())
+                .maxAge(viewCountCookie.getMaxAge())
+                .build();
+    }
+
+    private Cookie getViewCountCookie(HttpServletRequest request) {
+        Cookie[] cookies = request.getCookies();
+        if (cookies == null) return null;
+
+        return Arrays.stream(cookies)
+                .filter(cookie -> VIEW_COUNT_COOKIE_NAME.equals(cookie.getName()))
+                .findFirst()
+                .orElse(null);
+    }
+
+    private Cookie createViewCountCookie(Recruitment recruitment) {
+        recruitment.addViewCount();
+        Cookie newCookie = new Cookie(VIEW_COUNT_COOKIE_NAME, "[" + recruitment.getId() + "]");
+        newCookie.setPath("/");
+        return newCookie;
+    }
+
+    private boolean isRequestForNewRecruitment(Long recruitmentId, Cookie viewCountCookie) {
+        return !viewCountCookie.getValue().contains("[" + recruitmentId + "]");
+    }
+
+    private void updateViewCount(Recruitment recruitment, Cookie viewCountCookie, Long recruitmentId) {
+        viewCountCookie.setValue(viewCountCookie.getValue() + "[" + recruitmentId + "]");
+        recruitment.addViewCount();
+    }
 }