Add basic graphql implementation with manga and chapters loading with data loaders

server/src/main/kotlin/suwayomi/tachidesk/graphql/dataLoaders/ChapterDataLoader.kt

@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) Contributors to the Suwayomi project
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+package suwayomi.tachidesk.graphql.dataLoaders
+
+import com.expediagroup.graphql.dataloader.KotlinDataLoader
+import org.dataloader.DataLoader
+import org.dataloader.DataLoaderFactory
+import org.jetbrains.exposed.sql.StdOutSqlLogger
+import org.jetbrains.exposed.sql.addLogger
+import org.jetbrains.exposed.sql.select
+import org.jetbrains.exposed.sql.transactions.transaction
+import suwayomi.tachidesk.graphql.types.ChapterType
+import suwayomi.tachidesk.manga.model.table.ChapterTable
+import java.util.concurrent.CompletableFuture
+
+class ChapterDataLoader : KotlinDataLoader<Int, ChapterType> {
+    override val dataLoaderName = "ChapterDataLoader"
+    override fun getDataLoader(): DataLoader<Int, ChapterType> = DataLoaderFactory.newDataLoader<Int, ChapterType> { ids ->
+        CompletableFuture.supplyAsync {
+            transaction {
+                addLogger(StdOutSqlLogger)
+                ChapterTable.select { ChapterTable.id inList ids }
+                    .map { ChapterType(it) }
+            }
+        }
+    }
+}
+
+class ChaptersForMangaDataLoader : KotlinDataLoader<Int, List<ChapterType>> {
+    override val dataLoaderName = "ChaptersForMangaDataLoader"
+    override fun getDataLoader(): DataLoader<Int, List<ChapterType>> = DataLoaderFactory.newDataLoader<Int, List<ChapterType>> { ids ->
+        CompletableFuture.supplyAsync {
+            transaction {
+                addLogger(StdOutSqlLogger)
+                val chaptersByMangaId = ChapterTable.select { ChapterTable.manga inList ids }
+                    .map { ChapterType(it) }
+                    .groupBy { it.mangaId }
+                ids.map { chaptersByMangaId[it] ?: emptyList() }
+            }
+        }
+    }
+}