Adds H2 data directory to gitignore

.gitignore

@@ -38,3 +38,6 @@ out/
 
 ### Kotlin ###
 .kotlin
+
+### misc ###
+/data/

README.md

@@ -6,3 +6,12 @@ Kotlin Spring Boot based REST service for the Pretty Player
 
 * `ALBUM_ROOT_DIR` = Directory where the albums of mp3s can be found
 * `ALBUM_ART_ROOT_DIR` = Directory where the album art can be cached for later
+
+# TODO
+
+* Add in DB like SQLite where the DB can be written to disk easily, and the DB can run in memory.
+  * Allows for instant ready, while having new albums added async.
+
+# API Documentation
+
+* http://localhost:8080/swagger-ui/index.html

build.gradle.kts

@@ -3,12 +3,13 @@ import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
 plugins {
     id("org.springframework.boot") version "3.2.5"
     id("io.spring.dependency-management") version "1.1.4"
-    kotlin("jvm") version "1.9.23"
+    id("org.jetbrains.kotlin.plugin.jpa") version "2.0.0"
-    kotlin("plugin.spring") version "1.9.23"
+    kotlin("jvm") version "2.0.0"
+    kotlin("plugin.spring") version "2.0.0"
 }
 
 group = "net.halfbinary"
-version = "0.0.11-SNAPSHOT"
+version = "0.0.13-SNAPSHOT"
 
 java {
     sourceCompatibility = JavaVersion.VERSION_21
@@ -33,6 +34,7 @@ val coroutinesVersion = "1.8.1"
 dependencies {
     implementation("org.springframework.boot:spring-boot-starter-web")
     implementation("org.springframework.boot:spring-boot-starter-webflux")
+    implementation("org.springframework.boot:spring-boot-starter-data-jpa:3.3.0")
     implementation("com.fasterxml.jackson.module:jackson-module-kotlin")
     implementation("io.projectreactor.kotlin:reactor-kotlin-extensions")
     implementation("org.jetbrains.kotlin:kotlin-reflect")
@@ -44,6 +46,8 @@ dependencies {
     implementation("org.slf4j:slf4j-api:$slf4jApiVersion")
     implementation("ch.qos.logback:logback-core:$logbackVersion")
     implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:$coroutinesVersion")
+    implementation("org.springdoc:springdoc-openapi-starter-webmvc-ui:2.5.0")
+    runtimeOnly("com.h2database:h2")
     developmentOnly("org.springframework.boot:spring-boot-devtools")
     annotationProcessor("org.springframework.boot:spring-boot-configuration-processor")
     testImplementation("org.springframework.boot:spring-boot-starter-test")

src/main/kotlin/net/halfbinary/prettyplayerapi/config/WebConfig.kt

@@ -0,0 +1,14 @@
+package net.halfbinary.prettyplayerapi.config
+
+import org.springframework.context.annotation.Configuration
+import org.springframework.web.servlet.config.annotation.CorsRegistry
+import org.springframework.web.servlet.config.annotation.EnableWebMvc
+import org.springframework.web.servlet.config.annotation.WebMvcConfigurer
+
+@Configuration
+@EnableWebMvc
+class WebConfig : WebMvcConfigurer {
+    override fun addCorsMappings(registry: CorsRegistry) {
+        registry.addMapping("/**")
+    }
+}

src/main/kotlin/net/halfbinary/prettyplayerapi/controller/AlbumController.kt

@@ -4,7 +4,10 @@ import net.halfbinary.prettyplayerapi.model.AlbumInfo
 import net.halfbinary.prettyplayerapi.model.AlbumMetadata
 import net.halfbinary.prettyplayerapi.model.TrackInfo
 import net.halfbinary.prettyplayerapi.service.AlbumService
-import org.springframework.web.bind.annotation.*
+import org.springframework.web.bind.annotation.GetMapping
+import org.springframework.web.bind.annotation.PathVariable
+import org.springframework.web.bind.annotation.RequestMapping
+import org.springframework.web.bind.annotation.RestController
 
 @RestController
 @RequestMapping("album")

src/main/kotlin/net/halfbinary/prettyplayerapi/controller/CacheController.kt

@@ -1,15 +1,17 @@
 package net.halfbinary.prettyplayerapi.controller
 
+import net.halfbinary.prettyplayerapi.model.CacheType
 import net.halfbinary.prettyplayerapi.service.AlbumCacheService
-import org.springframework.web.bind.annotation.CrossOrigin
 import org.springframework.web.bind.annotation.GetMapping
+import org.springframework.web.bind.annotation.RequestMapping
+import org.springframework.web.bind.annotation.RequestParam
 import org.springframework.web.bind.annotation.RestController
 
 @RestController
-@CrossOrigin
+@RequestMapping("cache")
 class CacheController(private val albumCacheService: AlbumCacheService) {
-    @GetMapping("cache")
+    @GetMapping
-    suspend fun refreshAlbumCache() {
+    suspend fun refreshAlbumCache(@RequestParam type: CacheType) {
-        albumCacheService.refreshAlbumCache()
+        albumCacheService.cacheAlbums(type)
     }
 }

src/main/kotlin/net/halfbinary/prettyplayerapi/controller/FolderController.kt

@@ -1,15 +0,0 @@
-package net.halfbinary.prettyplayerapi.controller
-
-import net.halfbinary.prettyplayerapi.service.FolderService
-import org.springframework.web.bind.annotation.CrossOrigin
-import org.springframework.web.bind.annotation.GetMapping
-import org.springframework.web.bind.annotation.RestController
-
-@RestController
-@CrossOrigin
-class FolderController(private val folderService: FolderService) {
-    @GetMapping("folders")
-    fun listFolders(): List<String> {
-        return folderService.getFolderList()
-    }
-}

src/main/kotlin/net/halfbinary/prettyplayerapi/controller/ImageController.kt

@@ -2,15 +2,15 @@ package net.halfbinary.prettyplayerapi.controller
 
 import net.halfbinary.prettyplayerapi.service.ImageService
 import org.springframework.http.MediaType
-import org.springframework.web.bind.annotation.CrossOrigin
 import org.springframework.web.bind.annotation.GetMapping
 import org.springframework.web.bind.annotation.PathVariable
+import org.springframework.web.bind.annotation.RequestMapping
 import org.springframework.web.bind.annotation.RestController
 
 @RestController
-@CrossOrigin
+@RequestMapping("image")
 class ImageController(private val imageService: ImageService) {
-    @GetMapping(value = ["image/{id}"], produces = [MediaType.IMAGE_JPEG_VALUE])
+    @GetMapping(value = ["/{id}"], produces = [MediaType.IMAGE_JPEG_VALUE])
     fun getImage(@PathVariable("id") id: String): ByteArray {
         return imageService.getImage(id).readBytes()
     }

src/main/kotlin/net/halfbinary/prettyplayerapi/controller/MusicController.kt

@@ -2,16 +2,21 @@ package net.halfbinary.prettyplayerapi.controller
 
 import net.halfbinary.prettyplayerapi.service.MusicService
 import org.springframework.http.ResponseEntity
-import org.springframework.web.bind.annotation.*
+import org.springframework.web.bind.annotation.GetMapping
+import org.springframework.web.bind.annotation.PathVariable
+import org.springframework.web.bind.annotation.RequestMapping
+import org.springframework.web.bind.annotation.RestController
 import org.springframework.web.servlet.mvc.method.annotation.StreamingResponseBody
 
 @RestController
 @RequestMapping("music")
-@CrossOrigin
 class MusicController(private val musicService: MusicService) {
 
-    @GetMapping(value = ["/album/{albumHash}/{trackNumber}"], produces = ["audio/mpeg3"])
+    @GetMapping(value = ["/album/{albumHash}/track/{trackNumber}"], produces = ["audio/mpeg3"])
-    fun getAlbum(@PathVariable albumHash: String, @PathVariable trackNumber: Int): ResponseEntity<StreamingResponseBody> {
+    fun getAlbum(
+        @PathVariable albumHash: String,
+        @PathVariable trackNumber: Int
+    ): ResponseEntity<StreamingResponseBody> {
         val track = musicService.getMusic(albumHash, trackNumber)
         val responseBody = StreamingResponseBody { stream -> stream.write(track.readBytes()) }
         return ResponseEntity.ok().body(responseBody)

src/main/kotlin/net/halfbinary/prettyplayerapi/controller/TrackController.kt

@@ -1,27 +0,0 @@
-package net.halfbinary.prettyplayerapi.controller
-
-import com.mpatric.mp3agic.Mp3File
-import io.github.oshai.kotlinlogging.KotlinLogging
-import net.halfbinary.prettyplayerapi.model.TrackInfo
-import net.halfbinary.prettyplayerapi.service.MusicService
-import org.springframework.web.bind.annotation.CrossOrigin
-import org.springframework.web.bind.annotation.GetMapping
-import org.springframework.web.bind.annotation.PathVariable
-import org.springframework.web.bind.annotation.RestController
-
-private val logger = KotlinLogging.logger {}
-
-@RestController
-@CrossOrigin
-class TrackController(private val musicService: MusicService) {
-    @GetMapping("track/{albumHash}/{trackNumber}")
-    fun getTrackInfo(@PathVariable albumHash: String, @PathVariable trackNumber: Int): TrackInfo {
-        val file = musicService.getMusic(albumHash, trackNumber)
-        val trackFile = Mp3File(file)
-        trackFile.id3v2Tag.artist
-        trackFile.id3v2Tag.apply {
-            logger.debug { "Getting track $trackNumber. $title by $artist on $album" }
-            return TrackInfo(album, artist, title)
-        }
-    }
-}

src/main/kotlin/net/halfbinary/prettyplayerapi/exception/AlbumFolderNotFoundException.kt

@@ -0,0 +1,4 @@
+package net.halfbinary.prettyplayerapi.exception
+
+class AlbumFolderNotFoundException(folder: String) :
+    RuntimeException("Album folder $folder does not exist")

src/main/kotlin/net/halfbinary/prettyplayerapi/exception/AlbumHashNotFoundException.kt

@@ -1,4 +1,3 @@
 package net.halfbinary.prettyplayerapi.exception
 
-class AlbumHashNotFoundException(message: String) : RuntimeException(message) {
+class AlbumHashNotFoundException(hash: String) : RuntimeException("Album hash $hash not found")
-}

src/main/kotlin/net/halfbinary/prettyplayerapi/exception/EnvironmentVariableNotFoundException.kt

@@ -1,4 +1,4 @@
 package net.halfbinary.prettyplayerapi.exception
 
-class EnvironmentVariableNotFoundException(message: String) : RuntimeException(message) {
+class EnvironmentVariableNotFoundException(envVar: String) :
-}
+    RuntimeException("Environment variable $envVar does not exist, please specify")

src/main/kotlin/net/halfbinary/prettyplayerapi/exception/GlobalExceptionHandler.kt

@@ -10,21 +10,41 @@ class GlobalExceptionHandler {
     @ExceptionHandler
     fun handleEnvironmentVariableNotFoundException(e: EnvironmentVariableNotFoundException): ResponseEntity<ErrorResponse> {
         return ResponseEntity(
-            ErrorResponse(HttpStatus.INTERNAL_SERVER_ERROR.value(),
+            ErrorResponse(
-            e.message ?:""), HttpStatus.INTERNAL_SERVER_ERROR)
+                HttpStatus.INTERNAL_SERVER_ERROR.value(),
+                e.message ?: ""
+            ), HttpStatus.INTERNAL_SERVER_ERROR
+        )
     }
 
     @ExceptionHandler
     fun handleAlbumHashNotFoundException(e: AlbumHashNotFoundException): ResponseEntity<ErrorResponse> {
         return ResponseEntity(
-            ErrorResponse(HttpStatus.BAD_REQUEST.value(),
+            ErrorResponse(
-                e.message ?:""), HttpStatus.BAD_REQUEST)
+                HttpStatus.BAD_REQUEST.value(),
+                e.message ?: ""
+            ), HttpStatus.BAD_REQUEST
+        )
     }
+
+    @ExceptionHandler
+    fun handleAlbumFolderNotFoundException(e: AlbumFolderNotFoundException): ResponseEntity<ErrorResponse> {
+        return ResponseEntity(
+            ErrorResponse(
+                HttpStatus.INTERNAL_SERVER_ERROR.value(),
+                e.message ?: ""
+            ), HttpStatus.INTERNAL_SERVER_ERROR
+        )
+    }
+
     @ExceptionHandler
     fun handleException(e: RuntimeException): ResponseEntity<ErrorResponse> {
         return ResponseEntity(
-            ErrorResponse(HttpStatus.INTERNAL_SERVER_ERROR.value(),
+            ErrorResponse(
-            e.message?:""), HttpStatus.INTERNAL_SERVER_ERROR)
+                HttpStatus.INTERNAL_SERVER_ERROR.value(),
+                e.message ?: ""
+            ), HttpStatus.INTERNAL_SERVER_ERROR
+        )
     }
 
 }

src/main/kotlin/net/halfbinary/prettyplayerapi/model/CacheType.kt

@@ -0,0 +1,7 @@
+package net.halfbinary.prettyplayerapi.model
+
+enum class CacheType {
+    ART,
+    NEW,
+    ALL
+}

src/main/kotlin/net/halfbinary/prettyplayerapi/repository/AlbumRepository.kt

@@ -1,9 +1,21 @@
 package net.halfbinary.prettyplayerapi.repository
 
-import net.halfbinary.prettyplayerapi.model.AlbumMetadata
+import jakarta.persistence.Entity
+import jakarta.persistence.Id
+import jakarta.persistence.Table
+import org.springframework.data.jpa.repository.JpaRepository
 import org.springframework.stereotype.Repository
 
 @Repository
-class AlbumRepository {
+interface AlbumRepository : JpaRepository<AlbumRecord, String>
-    var albumCache: LinkedHashMap<String, AlbumMetadata> = linkedMapOf()
+
-}
+@Entity
+@Table(name = "album")
+data class AlbumRecord(
+    @Id
+    val id: String,
+    val albumTitle: String,
+    val albumFolder: String,
+    val albumArtist: String,
+    val albumYear: Int
+)

src/main/kotlin/net/halfbinary/prettyplayerapi/service/AlbumCacheService.kt

@@ -4,8 +4,10 @@ import com.mpatric.mp3agic.Mp3File
 import io.github.oshai.kotlinlogging.KotlinLogging
 import kotlinx.coroutines.*
 import net.halfbinary.prettyplayerapi.exception.EnvironmentVariableNotFoundException
-import net.halfbinary.prettyplayerapi.model.AlbumMetadata
+import net.halfbinary.prettyplayerapi.model.CacheType
+import net.halfbinary.prettyplayerapi.repository.AlbumRecord
 import net.halfbinary.prettyplayerapi.repository.AlbumRepository
+import org.springframework.data.repository.findByIdOrNull
 import org.springframework.stereotype.Service
 import java.awt.Image
 import java.awt.image.BufferedImage
@@ -17,48 +19,76 @@ import kotlin.io.path.name
 private val logger = KotlinLogging.logger {}
 
 @Service
-class AlbumCacheService(private val albumRepository: AlbumRepository,
+class AlbumCacheService(
-                        private val ioDispatcher: CoroutineDispatcher = Dispatchers.IO) {
+    private val albumRepository: AlbumRepository,
-
+    private val ioDispatcher: CoroutineDispatcher = Dispatchers.IO
-
+) {
-    suspend fun doAlbumCache() {
+    suspend fun cacheAlbums(type: CacheType = CacheType.ART) {
-        coroutineScope {
+        logger.debug { "Starting the cache process with type ${type.name}" }
-            launch { cacheAlbums(false) }
-        }
-    }
-    suspend fun refreshAlbumCache() {
-        coroutineScope{
-            launch { cacheAlbums(true)}
-        }
-    }
-
-    fun getAlbumCache(): LinkedHashMap<String, AlbumMetadata> {
-        return albumRepository.albumCache
-    }
-
-    suspend fun cacheAlbums(refresh: Boolean = false) {
-        logger.debug { "Starting the cache process with refresh set to $refresh" }
         createAlbumArtRootDir()
-        val list = getAlbumRootDir()
+        val fileList = getAlbumRootDir()
             .walkTopDown()
             .filter {
                 it.isFile && it.extension == "mp3" && it.name.startsWith("01.")
             }
             .toList()
-            .map { Pair(it, Mp3File(it)) }
+        when (type) {
-            .sortedWith(getMusicComparator())
+            CacheType.ART -> cacheArt(fileList)
-            .map {
+            CacheType.NEW -> cacheNew(fileList)
-                val folder = it.first.parentFile.toPath()
+            CacheType.ALL -> cacheAll(fileList)
-                val folderHash = folder.name.hashCode().toString()
-                coroutineScope {
-                    launch {getAndWriteAlbumImageFile(it.first, folderHash, folder, refresh)}
         }
-                Pair(folderHash, AlbumMetadata(it.second.id3v2Tag.album, it.first.parent, folderHash))
     }
 
-        albumRepository.albumCache = convertAlbumListToMapForCache(list)
+    suspend fun cacheAll(fileList: List<File>) {
-        //TODO: Write cache to file for later reading...or get a DB going?
+        fileList.forEach {
-        logger.info { "Albums cached: ${albumRepository.albumCache.size}" }
+            val mp3File = Mp3File(it)
+            val folderPath = it.parentFile.toPath()
+            val folderHash = folderPath.name.hashCode().toString()
+            coroutineScope {
+                launch { getAndWriteAlbumImageFile(it, folderHash, folderPath) }
+            }
+            albumRepository.save(
+                AlbumRecord(
+                    folderHash,
+                    mp3File.id3v2Tag.album,
+                    it.parent,
+                    mp3File.id3v2Tag.albumArtist,
+                    mp3File.id3v2Tag.year.toInt()
+                )
+            )
+        }
+    }
+
+    suspend fun cacheNew(fileList: List<File>) {
+        fileList.forEach {
+            val folderPath = it.parentFile.toPath()
+            val folderHash = folderPath.name.hashCode().toString()
+            if (albumRepository.findByIdOrNull(folderHash) == null) {
+                coroutineScope {
+                    launch { getAndWriteAlbumImageFile(it, folderHash, folderPath) }
+                }
+                val mp3File = Mp3File(it)
+                albumRepository.save(
+                    AlbumRecord(
+                        folderHash,
+                        mp3File.id3v2Tag.album,
+                        it.parent,
+                        mp3File.id3v2Tag.albumArtist,
+                        mp3File.id3v2Tag.year.toInt()
+                    )
+                )
+            }
+        }
+    }
+
+    suspend fun cacheArt(fileList: List<File>) {
+        fileList.forEach {
+            val folderPath = it.parentFile.toPath()
+            val folderHash = folderPath.name.hashCode().toString()
+            coroutineScope {
+                launch { getAndWriteAlbumImageFile(it, folderHash, folderPath) }
+            }
+        }
     }
 
     fun createAlbumArtRootDir() {
@@ -75,20 +105,15 @@ class AlbumCacheService(private val albumRepository: AlbumRepository,
         return root
     }
 
-    fun getMusicComparator(): Comparator<Pair<File, Mp3File>> {
+    suspend fun getAndWriteAlbumImageFile(
-        return compareBy({ it.second.id3v2Tag.albumArtist }, {it.second.id3v2Tag.album}, {it.second.id3v2Tag.year})
+        file: File,
-    }
+        folderHash: String,
-
+        folder: Path
-    fun convertAlbumListToMapForCache(list: List<Pair<String, AlbumMetadata>>): java.util.LinkedHashMap<String, AlbumMetadata> {
+    ) {
-        val array = list.toTypedArray()
-        return linkedMapOf(*array)
-    }
-
-    suspend fun getAndWriteAlbumImageFile(file: File, folderHash: String, folder: Path, refresh: Boolean = false) {
         logger.info { "Checking album $folder with hash $folderHash" }
         val hashedFile = File("$ALBUM_ART_ROOT_DIR/$folderHash.jpg")
-        if(refresh || !hashedFile.exists()) {
+        if (!hashedFile.exists()) {
-            logger.debug { "No image for $folder, making one..." }
+            logger.debug { "Making image for $folder with hash $folderHash..." }
             val imageByteStream = Mp3File(file).id3v2Tag.albumImage.inputStream()
             val bufferedImage = withContext(ioDispatcher) {
                 ImageIO.read(imageByteStream)
@@ -108,6 +133,7 @@ class AlbumCacheService(private val albumRepository: AlbumRepository,
             return System.getenv(envName)
                 ?: throw EnvironmentVariableNotFoundException(envName)
         }
+
         val ALBUM_ROOT_DIR = getEnv("ALBUM_ROOT_DIR") //"q:\\CDs"
         val ALBUM_ART_ROOT_DIR = getEnv("ALBUM_ART_ROOT_DIR") //"src/main/resources/images/"
     }

src/main/kotlin/net/halfbinary/prettyplayerapi/service/AlbumService.kt

@@ -1,11 +1,64 @@
 package net.halfbinary.prettyplayerapi.service
 
+import com.mpatric.mp3agic.Mp3File
+import io.github.oshai.kotlinlogging.KotlinLogging
+import net.halfbinary.prettyplayerapi.exception.AlbumFolderNotFoundException
+import net.halfbinary.prettyplayerapi.exception.AlbumHashNotFoundException
 import net.halfbinary.prettyplayerapi.model.AlbumInfo
+import net.halfbinary.prettyplayerapi.model.AlbumMetadata
+import net.halfbinary.prettyplayerapi.model.AlbumTrackInfo
+import net.halfbinary.prettyplayerapi.model.TrackInfo
+import net.halfbinary.prettyplayerapi.repository.AlbumRepository
+import org.springframework.data.domain.Sort
+import org.springframework.data.repository.findByIdOrNull
 import org.springframework.stereotype.Service
+import java.io.File
+
+private val logger = KotlinLogging.logger {}
 
 @Service
-class AlbumService(private val albumCacheService: AlbumCacheService) {
+class AlbumService(private val albumRepository: AlbumRepository) {
-    fun getAlbumList(): List<AlbumInfo> {
+    fun getAlbumList(): List<AlbumMetadata> {
-        return albumCacheService.getAlbumCache().map { (_,v) -> v }
+        return albumRepository
+            .findAll(Sort.by(Sort.Direction.ASC, "albumArtist", "albumYear", "albumTitle"))
+            .map { AlbumMetadata(it.albumTitle, it.albumFolder, it.id) }
+    }
+
+    fun getAlbumInfo(albumHash: String): AlbumInfo {
+        val albumRecordResponse = albumRepository.findByIdOrNull(albumHash)
+        val trackFileList = if (albumRecordResponse != null) {
+            File(albumRecordResponse.albumFolder).listFiles()
+                ?.filter { it.name.endsWith(".mp3") }
+                ?.sortedBy { it.name }
+                ?: throw AlbumFolderNotFoundException(albumRecordResponse.albumFolder)
+        } else {
+            throw AlbumHashNotFoundException(albumHash)
+        }
+        val trackList = trackFileList.map {
+            val id3 = Mp3File(it).id3v2Tag
+            id3.run {
+                AlbumTrackInfo(track.toInt(), artist, title)
+            }
+        }
+        val id3 = Mp3File(trackFileList[0]).id3v2Tag
+        return AlbumInfo(id3.album, id3.albumArtist, trackList)
+    }
+
+    fun getTrackInfo(albumHash: String, trackNumber: Int): TrackInfo {
+        val albumInfo = albumRepository.findByIdOrNull(albumHash)
+        val file = if (albumInfo != null) {
+            File(albumInfo.albumFolder).listFiles()
+                ?.filter { it.name.endsWith(".mp3") }
+                ?.sortedBy { it.name }
+                ?.get(trackNumber)
+        } else {
+            throw AlbumHashNotFoundException(albumHash)
+        }
+        val trackFile = Mp3File(file)
+        trackFile.id3v2Tag.artist
+        trackFile.id3v2Tag.apply {
+            logger.debug { "Getting track $trackNumber: $track. $title by $artist on $album" }
+            return TrackInfo(album, artist, title)
+        }
     }
 }

src/main/kotlin/net/halfbinary/prettyplayerapi/service/FolderService.kt

@@ -1,10 +0,0 @@
-package net.halfbinary.prettyplayerapi.service
-
-import org.springframework.stereotype.Service
-
-@Service
-class FolderService(private val albumCacheService: AlbumCacheService) {
-    fun getFolderList(): List<String> {
-        return albumCacheService.getAlbumCache().map { (_,v) -> v.albumFolder }
-    }
-}

src/main/kotlin/net/halfbinary/prettyplayerapi/service/MusicService.kt

@@ -1,17 +1,25 @@
 package net.halfbinary.prettyplayerapi.service
 
+import net.halfbinary.prettyplayerapi.exception.AlbumFolderNotFoundException
 import net.halfbinary.prettyplayerapi.exception.AlbumHashNotFoundException
+import net.halfbinary.prettyplayerapi.repository.AlbumRepository
+import org.springframework.data.repository.findByIdOrNull
 import org.springframework.stereotype.Service
 import java.io.File
 
 @Service
-class MusicService(private val albumCacheService: AlbumCacheService) {
+class MusicService(private val albumRepository: AlbumRepository) {
     fun getMusic(albumHash: String, trackNumber: Int): File {
-        val albumInfo = albumCacheService.getAlbumCache()[albumHash]
+        val albumInfo = albumRepository.findByIdOrNull(albumHash)
         return if (albumInfo != null) {
-            File(albumInfo.albumFolder).listFiles().sortedBy { it.name }[trackNumber-1]
+            File(albumInfo.albumFolder)
+                .listFiles()
+                ?.filter { it.name.endsWith(".mp3") }
+                ?.sortedBy { it.name }
+                ?.get(trackNumber)
+                ?: throw AlbumFolderNotFoundException(albumInfo.albumFolder)
         } else {
-            throw AlbumHashNotFoundException("Album hash $albumHash not found")
+            throw AlbumHashNotFoundException(albumHash)
         }
     }
 }

src/main/kotlin/net/halfbinary/prettyplayerapi/service/StartupService.kt

@@ -1,23 +1,39 @@
 package net.halfbinary.prettyplayerapi.service
 
 import io.github.oshai.kotlinlogging.KotlinLogging
-import kotlinx.coroutines.coroutineScope
+import kotlinx.coroutines.*
-import kotlinx.coroutines.launch
+import net.halfbinary.prettyplayerapi.model.CacheType
+import net.halfbinary.prettyplayerapi.repository.AlbumRepository
 import org.springframework.boot.context.event.ApplicationStartedEvent
 import org.springframework.context.event.EventListener
 import org.springframework.scheduling.annotation.Async
 import org.springframework.stereotype.Component
 
 private val logger = KotlinLogging.logger {}
+
 @Component
-class StartupService(private val albumCacheService: AlbumCacheService) {
+class StartupService(
+    private val albumRepository: AlbumRepository,
+    private val albumCacheService: AlbumCacheService,
+    private val ioDispatcher: CoroutineDispatcher = Dispatchers.IO
+) {
 
     @Async
     @EventListener(ApplicationStartedEvent::class)
     suspend fun onStartup() {
+        if (withContext(ioDispatcher) {
+                albumRepository.count()
+            } == 0L) {
             coroutineScope {
                 launch {
-                albumCacheService.doAlbumCache()
+                    albumCacheService.cacheAlbums(CacheType.ALL)
+                }
+            }
+        } else {
+            coroutineScope {
+                launch {
+                    albumCacheService.cacheAlbums(CacheType.NEW)
+                }
             }
         }
     }

src/main/resources/application.properties

@@ -1 +1,6 @@
 spring.application.name=prettyplayerapi
+spring.datasource.url=jdbc:h2:file:./data/prettyplayerdata
+spring.datasource.driverClassName=org.h2.Driver
+spring.datasource.username=pp
+spring.datasource.password=pppass
+spring.jpa.hibernate.ddl-auto=update