feat(creator): 채널 라이브 탭 도메인 정책을 추가한다

src/main/kotlin/kr/co/vividnext/sodalive/v2/creator/channel/live/domain/CreatorChannelLiveReplayQueryPolicy.kt

@@ -0,0 +1,28 @@
+package kr.co.vividnext.sodalive.v2.creator.channel.live.domain
+
+import kr.co.vividnext.sodalive.common.SodaException
+import org.springframework.stereotype.Component
+
+@Component
+class CreatorChannelLiveReplayQueryPolicy {
+    fun createPage(page: Int, size: Int): CreatorChannelPage {
+        if (page < MIN_PAGE || size < MIN_PAGE_SIZE || size > MAX_PAGE_SIZE) {
+            throw SodaException(messageKey = "common.error.invalid_request")
+        }
+        return CreatorChannelPage(page = page, size = size)
+    }
+
+    fun <T> limitItems(fetched: List<T>, page: CreatorChannelPage): List<T> {
+        return fetched.take(page.size)
+    }
+
+    fun hasNext(fetched: List<*>, page: CreatorChannelPage): Boolean {
+        return fetched.size > page.size
+    }
+
+    companion object {
+        private const val MIN_PAGE = 0
+        private const val MIN_PAGE_SIZE = 20
+        private const val MAX_PAGE_SIZE = 50
+    }
+}

src/main/kotlin/kr/co/vividnext/sodalive/v2/creator/channel/live/domain/CreatorChannelLiveTab.kt

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+package kr.co.vividnext.sodalive.v2.creator.channel.live.domain
+
+import kr.co.vividnext.sodalive.v2.common.domain.ContentSort
+import java.time.LocalDateTime
+
+data class CreatorChannelLiveTab(
+    val liveReplayContentCount: Int,
+    val currentLive: CreatorChannelLive?,
+    val liveReplayContents: List<CreatorChannelAudioContent>,
+    val sort: ContentSort,
+    val page: CreatorChannelPage,
+    val hasNext: Boolean
+)
+
+data class CreatorChannelLive(
+    val liveId: Long,
+    val title: String,
+    val coverImageUrl: String?,
+    val beginDateTime: LocalDateTime,
+    val price: Int,
+    val isAdult: Boolean
+)
+
+data class CreatorChannelAudioContent(
+    val audioContentId: Long,
+    val title: String,
+    val duration: String?,
+    val imageUrl: String?,
+    val price: Int,
+    val isAdult: Boolean,
+    val isPointAvailable: Boolean,
+    val isFirstContent: Boolean,
+    val publishedAt: LocalDateTime,
+    val seriesName: String?,
+    val isOriginalSeries: Boolean?,
+    val isOwned: Boolean,
+    val isRented: Boolean
+)

src/main/kotlin/kr/co/vividnext/sodalive/v2/creator/channel/live/domain/CreatorChannelPage.kt

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+package kr.co.vividnext.sodalive.v2.creator.channel.live.domain
+
+data class CreatorChannelPage(
+    val page: Int,
+    val size: Int
+) {
+    val offset: Long = page.toLong() * size
+    val fetchLimit: Int = size + 1
+}

src/test/kotlin/kr/co/vividnext/sodalive/v2/creator/channel/live/domain/CreatorChannelLiveReplayQueryPolicyTest.kt

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+package kr.co.vividnext.sodalive.v2.creator.channel.live.domain
+
+import kr.co.vividnext.sodalive.common.SodaException
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.Assertions.assertThrows
+import org.junit.jupiter.api.Assertions.assertTrue
+import org.junit.jupiter.api.DisplayName
+import org.junit.jupiter.api.Test
+
+class CreatorChannelLiveReplayQueryPolicyTest {
+    private val policy = CreatorChannelLiveReplayQueryPolicy()
+
+    @Test
+    @DisplayName("라이브 다시듣기 page 정책은 offset, fetch limit, items limit, hasNext를 계산한다")
+    fun shouldCalculatePagePolicyForLiveReplayContents() {
+        val page = policy.createPage(page = 0, size = 20)
+        val fetched = (1..21).toList()
+
+        val items = policy.limitItems(fetched, page)
+
+        assertEquals(0L, page.offset)
+        assertEquals(21, page.fetchLimit)
+        assertEquals(20, items.size)
+        assertEquals((1..20).toList(), items)
+        assertTrue(policy.hasNext(fetched, page))
+    }
+
+    @Test
+    @DisplayName("size가 50이면 fetch limit을 51로 계산한다")
+    fun shouldCalculateFetchLimitWhenSizeIsMaximum() {
+        val page = policy.createPage(page = 1, size = 50)
+
+        assertEquals(50L, page.offset)
+        assertEquals(51, page.fetchLimit)
+    }
+
+    @Test
+    @DisplayName("page가 0보다 작으면 invalid request 예외를 던진다")
+    fun shouldThrowInvalidRequestWhenPageIsNegative() {
+        val exception = assertThrows(SodaException::class.java) {
+            policy.createPage(page = -1, size = 20)
+        }
+
+        assertEquals("common.error.invalid_request", exception.messageKey)
+    }
+
+    @Test
+    @DisplayName("size가 20보다 작으면 invalid request 예외를 던진다")
+    fun shouldThrowInvalidRequestWhenSizeIsLessThanMinimum() {
+        val exception = assertThrows(SodaException::class.java) {
+            policy.createPage(page = 0, size = 19)
+        }
+
+        assertEquals("common.error.invalid_request", exception.messageKey)
+    }
+
+    @Test
+    @DisplayName("size가 50보다 크면 invalid request 예외를 던진다")
+    fun shouldThrowInvalidRequestWhenSizeIsGreaterThanMaximum() {
+        val exception = assertThrows(SodaException::class.java) {
+            policy.createPage(page = 0, size = 51)
+        }
+
+        assertEquals("common.error.invalid_request", exception.messageKey)
+    }
+
+    @Test
+    @DisplayName("size가 Int 최대값이면 fetch limit overflow 전에 invalid request 예외를 던진다")
+    fun shouldThrowInvalidRequestWhenSizeWouldOverflowFetchLimit() {
+        val exception = assertThrows(SodaException::class.java) {
+            policy.createPage(page = 0, size = Int.MAX_VALUE)
+        }
+
+        assertEquals("common.error.invalid_request", exception.messageKey)
+    }
+}