[#171] feat: 포스트 제거 시 포스트에 대한 통계 제거

src/main/java/com/mallang/statistics/statistic/PostViewStatisticRepository.java

@@ -4,8 +4,14 @@
 import java.time.LocalDate;
 import java.util.Optional;
 import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Modifying;
+import org.springframework.data.jpa.repository.Query;
 
 public interface PostViewStatisticRepository extends JpaRepository<PostViewStatistic, Long> {
 
     Optional<PostViewStatistic> findByPostIdAndStatisticDate(PostId postId, LocalDate localDate);
+
+    @Modifying
+    @Query("DELETE FROM PostViewStatistic s WHERE s.postId = :postId")
+    void deleteAllByPostId(PostId postId);
 }

src/main/java/com/mallang/statistics/statistic/application/PostViewStatisticEventHandler.java

@@ -0,0 +1,21 @@
+package com.mallang.statistics.statistic.application;
+
+import com.mallang.post.domain.PostDeleteEvent;
+import com.mallang.statistics.statistic.PostViewStatisticRepository;
+import lombok.RequiredArgsConstructor;
+import org.springframework.context.event.EventListener;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+@RequiredArgsConstructor
+@Transactional
+@Service
+public class PostViewStatisticEventHandler {
+
+    private final PostViewStatisticRepository postViewStatisticRepository;
+
+    @EventListener(PostDeleteEvent.class)
+    void deletePostViewStatistic(PostDeleteEvent event) {
+        postViewStatisticRepository.deleteAllByPostId(event.postId());
+    }
+}

src/test/java/com/mallang/statistics/statistic/application/PostViewStatisticEventHandlerTest.java

@@ -0,0 +1,39 @@
+package com.mallang.statistics.statistic.application;
+
+import static org.mockito.BDDMockito.then;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.times;
+
+import com.mallang.post.domain.PostDeleteEvent;
+import com.mallang.post.domain.PostId;
+import com.mallang.statistics.statistic.PostViewStatisticRepository;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.DisplayNameGeneration;
+import org.junit.jupiter.api.DisplayNameGenerator.ReplaceUnderscores;
+import org.junit.jupiter.api.Test;
+
+@DisplayName("포스트 조회 통계 이벤트 핸들러 (PostViewStatisticEventHandler) 은(는)")
+@SuppressWarnings("NonAsciiCharacters")
+@DisplayNameGeneration(ReplaceUnderscores.class)
+class PostViewStatisticEventHandlerTest {
+
+    private final PostViewStatisticRepository postViewStatisticRepository = mock(PostViewStatisticRepository.class);
+    private final PostViewStatisticEventHandler postViewStatisticEventHandler = new PostViewStatisticEventHandler(
+            postViewStatisticRepository
+    );
+
+    @Test
+    void 포스트_제거_이벤트를_받아_해당_포스트의_조회_이력을_제거한다() {
+        // given
+        PostId postId = new PostId(1L, 1L);
+        PostDeleteEvent postDeleteEvent = new PostDeleteEvent(postId);
+
+        // when
+        postViewStatisticEventHandler.deletePostViewStatistic(postDeleteEvent);
+
+        // then
+        then(postViewStatisticRepository)
+                .should(times(1))
+                .deleteAllByPostId(postId);
+    }
+}