[Feat/#221] 아티클 조회수 저장 방식 및 조회 방식 개선

api-repo/src/main/kotlin/com/few/api/repo/dao/article/ArticleViewCountDao.kt

@@ -0,0 +1,30 @@
+package com.few.api.repo.dao.article
+
+import com.few.api.repo.dao.article.command.ArticleViewCountCommand
+import com.few.api.repo.dao.article.query.ArticleViewCountQuery
+import jooq.jooq_dsl.Tables.ARTICLE_VIEW_COUNT
+import org.jooq.DSLContext
+import org.springframework.stereotype.Repository
+
+@Repository
+class ArticleViewCountDao(
+    private val dslContext: DSLContext,
+) {
+
+    fun upsertArticleViewCount(query: ArticleViewCountQuery) {
+        dslContext.insertInto(ARTICLE_VIEW_COUNT)
+            .set(ARTICLE_VIEW_COUNT.ARTICLE_ID, query.articleId)
+            .set(ARTICLE_VIEW_COUNT.VIEW_COUNT, 1)
+            .onDuplicateKeyUpdate()
+            .set(ARTICLE_VIEW_COUNT.VIEW_COUNT, ARTICLE_VIEW_COUNT.VIEW_COUNT.plus(1))
+    }
+
+    fun selectArticleViewCount(command: ArticleViewCountCommand): Long? {
+        return dslContext.select(
+            ARTICLE_VIEW_COUNT.VIEW_COUNT
+        ).from(ARTICLE_VIEW_COUNT)
+            .where(ARTICLE_VIEW_COUNT.ARTICLE_ID.eq(command.articleId))
+            .and(ARTICLE_VIEW_COUNT.DELETED_AT.isNull)
+            .fetchOneInto(Long::class.java)
+    }
+}

api-repo/src/main/kotlin/com/few/api/repo/dao/article/command/ArticleViewCountCommand.kt

@@ -0,0 +1,5 @@
+package com.few.api.repo.dao.article.command
+
+data class ArticleViewCountCommand(
+    val articleId: Long,
+)

api-repo/src/main/kotlin/com/few/api/repo/dao/article/query/ArticleViewCountQuery.kt

@@ -0,0 +1,5 @@
+package com.few.api.repo.dao.article.query
+
+data class ArticleViewCountQuery(
+    val articleId: Long,
+)

api/src/main/kotlin/com/few/api/domain/article/handler/ArticleViewCountHandler.kt

@@ -0,0 +1,18 @@
+package com.few.api.domain.article.handler
+
+import com.few.api.repo.dao.article.ArticleViewCountDao
+import com.few.api.repo.dao.article.command.ArticleViewCountCommand
+import org.springframework.stereotype.Component
+import org.springframework.transaction.annotation.Isolation
+import org.springframework.transaction.annotation.Propagation
+import org.springframework.transaction.annotation.Transactional
+
+@Component
+class ArticleViewCountHandler(
+    private val articleViewCountDao: ArticleViewCountDao,
+) {
+    @Transactional(isolation = Isolation.READ_UNCOMMITTED, propagation = Propagation.REQUIRES_NEW)
+    fun browseArticleViewCount(articleId: Long): Long {
+        return (articleViewCountDao.selectArticleViewCount(ArticleViewCountCommand(articleId)) ?: 0L) + 1L
+    }
+}

api/src/main/kotlin/com/few/api/domain/article/handler/ArticleViewHisAsyncHandler.kt

@@ -1,8 +1,10 @@
 package com.few.api.domain.article.handler
 
 import com.few.api.config.DatabaseAccessThreadPoolConfig.Companion.DATABASE_ACCESS_POOL
+import com.few.api.repo.dao.article.ArticleViewCountDao
 import com.few.api.repo.dao.article.ArticleViewHisDao
 import com.few.api.repo.dao.article.command.ArticleViewHisCommand
+import com.few.api.repo.dao.article.query.ArticleViewCountQuery
 import io.github.oshai.kotlinlogging.KotlinLogging
 import org.springframework.scheduling.annotation.Async
 import org.springframework.stereotype.Component
@@ -11,6 +13,7 @@ import org.springframework.transaction.annotation.Transactional
 @Component
 class ArticleViewHisAsyncHandler(
     private val articleViewHisDao: ArticleViewHisDao,
+    private val articleViewCountDao: ArticleViewCountDao,
 ) {
     private val log = KotlinLogging.logger {}
 
@@ -20,8 +23,14 @@ class ArticleViewHisAsyncHandler(
         try {
             articleViewHisDao.insertArticleViewHis(ArticleViewHisCommand(articleId, memberId))
             log.debug { "Successfully inserted article view history for articleId: $articleId and memberId: $memberId" }
+
+            articleViewCountDao.upsertArticleViewCount(ArticleViewCountQuery(articleId))
+            log.debug { "Successfully upserted article view count for articleId: $articleId and memberId: $memberId" }
         } catch (e: Exception) {
-            log.error { "Failed to insert article view history for articleId: $articleId and memberId: $memberId" }
+            log.error {
+                "Failed insertion article view history and upsertion article view count " +
+                    "for articleId: $articleId and memberId: $memberId"
+            }
         }
     }
 }

api/src/main/kotlin/com/few/api/domain/article/usecase/ReadArticleUseCase.kt

@@ -1,5 +1,6 @@
 package com.few.api.domain.article.usecase
 
+import com.few.api.domain.article.handler.ArticleViewCountHandler
 import com.few.api.domain.article.handler.ArticleViewHisAsyncHandler
 import com.few.api.domain.article.usecase.dto.ReadArticleUseCaseIn
 import com.few.api.domain.article.usecase.dto.ReadArticleUseCaseOut
@@ -10,8 +11,6 @@ import com.few.api.domain.article.service.dto.BrowseArticleProblemIdsInDto
 import com.few.api.domain.article.service.dto.ReadWriterRecordInDto
 import com.few.api.exception.common.NotFoundException
 import com.few.api.repo.dao.article.ArticleDao
-import com.few.api.repo.dao.article.ArticleViewHisDao
-import com.few.api.repo.dao.article.query.ArticleViewHisCountQuery
 import com.few.api.repo.dao.article.query.SelectArticleRecordQuery
 import com.few.data.common.code.CategoryType
 import org.springframework.stereotype.Component
@@ -22,8 +21,8 @@ class ReadArticleUseCase(
     private val articleDao: ArticleDao,
     private val readArticleWriterRecordService: ReadArticleWriterRecordService,
     private val browseArticleProblemsService: BrowseArticleProblemsService,
-    private val articleViewHisDao: ArticleViewHisDao,
     private val articleViewHisAsyncHandler: ArticleViewHisAsyncHandler,
+    private val articleViewCountHandler: ArticleViewCountHandler,
 ) {
 
     @Transactional(readOnly = true)
@@ -41,8 +40,8 @@ class ReadArticleUseCase(
                 browseArticleProblemsService.execute(query)
             }
 
-        val views = (articleViewHisDao.countArticleViews(ArticleViewHisCountQuery(useCaseIn.articleId)) ?: 0L) + 1L
-
+        // ARTICLE VIEW HIS에 저장하기 전에 먼저 VIEW COUNT 조회하는 순서 변경 금지
+        val views = articleViewCountHandler.browseArticleViewCount(useCaseIn.articleId)
         articleViewHisAsyncHandler.addArticleViewHis(useCaseIn.articleId, useCaseIn.memberId)
 
         return ReadArticleUseCaseOut(

api/src/test/kotlin/com/few/api/domain/article/usecase/ReadArticleUseCaseTest.kt

@@ -1,13 +1,13 @@
 package com.few.api.domain.article.usecase
 
+import com.few.api.domain.article.handler.ArticleViewCountHandler
 import com.few.api.domain.article.handler.ArticleViewHisAsyncHandler
 import com.few.api.domain.article.service.BrowseArticleProblemsService
 import com.few.api.domain.article.service.ReadArticleWriterRecordService
 import com.few.api.domain.article.service.dto.BrowseArticleProblemsOutDto
 import com.few.api.domain.article.service.dto.ReadWriterOutDto
 import com.few.api.domain.article.usecase.dto.ReadArticleUseCaseIn
 import com.few.api.repo.dao.article.ArticleDao
-import com.few.api.repo.dao.article.ArticleViewHisDao
 import com.few.api.repo.dao.article.record.SelectArticleRecord
 import io.github.oshai.kotlinlogging.KotlinLogging
 import io.kotest.assertions.throwables.shouldThrow
@@ -24,22 +24,22 @@ class ReadArticleUseCaseTest : BehaviorSpec({
     lateinit var readArticleWriterRecordService: ReadArticleWriterRecordService
     lateinit var browseArticleProblemsService: BrowseArticleProblemsService
     lateinit var useCase: ReadArticleUseCase
-    lateinit var articleViewHisDao: ArticleViewHisDao
     lateinit var articleViewHisAsyncHandler: ArticleViewHisAsyncHandler
+    lateinit var articleViewCountHandler: ArticleViewCountHandler
     val useCaseIn = ReadArticleUseCaseIn(articleId = 1L, memberId = 1L)
 
     beforeContainer {
         articleDao = mockk<ArticleDao>()
         readArticleWriterRecordService = mockk<ReadArticleWriterRecordService>()
         browseArticleProblemsService = mockk<BrowseArticleProblemsService>()
-        articleViewHisDao = mockk<ArticleViewHisDao>()
         articleViewHisAsyncHandler = mockk<ArticleViewHisAsyncHandler>()
+        articleViewCountHandler = mockk<ArticleViewCountHandler>()
         useCase = ReadArticleUseCase(
             articleDao,
             readArticleWriterRecordService,
             browseArticleProblemsService,
-            articleViewHisDao,
-            articleViewHisAsyncHandler
+            articleViewHisAsyncHandler,
+            articleViewCountHandler
         )
     }
 
@@ -64,7 +64,7 @@ class ReadArticleUseCaseTest : BehaviorSpec({
             every { articleDao.selectArticleRecord(any()) } returns record
             every { readArticleWriterRecordService.execute(any()) } returns writerSvcOutDto
             every { browseArticleProblemsService.execute(any()) } returns probSvcOutDto
-            every { articleViewHisDao.countArticleViews(any()) } returns 1L
+            every { articleViewCountHandler.browseArticleViewCount(any()) } returns 1L
             every { articleViewHisAsyncHandler.addArticleViewHis(any(), any()) } answers {
                 log.debug { "Inserting article view history asynchronously" }
             }
@@ -75,7 +75,7 @@ class ReadArticleUseCaseTest : BehaviorSpec({
                 verify(exactly = 1) { articleDao.selectArticleRecord(any()) }
                 verify(exactly = 1) { readArticleWriterRecordService.execute(any()) }
                 verify(exactly = 1) { browseArticleProblemsService.execute(any()) }
-                verify(exactly = 1) { articleViewHisDao.countArticleViews(any()) }
+                verify(exactly = 1) { articleViewCountHandler.browseArticleViewCount(any()) }
                 verify(exactly = 1) { articleViewHisAsyncHandler.addArticleViewHis(any(), any()) }
             }
         }

data/db/migration/entity/V1.00.0.14__manage_article_view_count.sql

@@ -0,0 +1,12 @@
+-- article 별 조회수 저장 테이블
+CREATE TABLE ARTICLE_VIEW_COUNT
+(
+    article_id BIGINT NOT NULL,
+    view_count BIGINT NOT NULL,
+    deleted_at TIMESTAMP NULL DEFAULT NULL,
+    CONSTRAINT article_view_count_pk PRIMARY KEY (article_id)
+);
+
+-- 조회수 순으로 아티클 조회시 사용하기 위한 인덱스
+-- ex. SELECT * FROM ARTICLE_VIEW_COUNT ORDER BY view_count;
+CREATE INDEX article_view_count_idx ON ARTICLE_VIEW_COUNT (view_count);