new: integrate a dispatcher provider and dispatch work

core/coroutines/build.gradle.kts

@@ -0,0 +1,53 @@
+import org.jetbrains.kotlin.gradle.ExperimentalWasmDsl
+import org.jetbrains.kotlin.gradle.dsl.JvmTarget
+
+plugins {
+    alias(libs.plugins.kotlinMultiplatform)
+    alias(libs.plugins.androidMultiplatformLibrary)
+}
+
+kotlin {
+    iosArm64()
+    iosSimulatorArm64()
+
+    jvm()
+
+    js {
+        browser()
+    }
+
+    @OptIn(ExperimentalWasmDsl::class)
+    wasmJs {
+        browser()
+    }
+
+    androidLibrary {
+        namespace = "fr.ajaury.gwenedeg.core.coroutines"
+        compileSdk =
+            libs.versions.androidCompileSdk
+                .get()
+                .toInt()
+        minSdk =
+            libs.versions.androidMinSdk
+                .get()
+                .toInt()
+
+        compilerOptions {
+            jvmTarget = JvmTarget.JVM_11
+        }
+    }
+
+    sourceSets {
+        commonMain.dependencies {
+            // Coroutines
+            implementation(libs.kotlinx.coroutinesCore)
+
+            // DI
+            implementation(project.dependencies.platform(libs.koin.bom))
+            implementation(libs.koin.core)
+        }
+        commonTest.dependencies {
+            implementation(libs.kotlin.test)
+        }
+    }
+}

core/coroutines/src/androidMain/kotlin/fr/ajaury/gwenedeg/core/coroutines/data/IoDispatcher.android.kt

@@ -0,0 +1,6 @@
+package fr.ajaury.gwenedeg.core.coroutines.data
+
+import kotlinx.coroutines.CoroutineDispatcher
+import kotlinx.coroutines.Dispatchers
+
+internal actual val ioDispatcher: CoroutineDispatcher = Dispatchers.IO

core/coroutines/src/commonMain/kotlin/fr/ajaury/gwenedeg/core/coroutines/data/DefaultDispatcherProvider.kt

@@ -0,0 +1,11 @@
+package fr.ajaury.gwenedeg.core.coroutines.data
+
+import fr.ajaury.gwenedeg.core.coroutines.domain.DispatcherProvider
+import kotlinx.coroutines.CoroutineDispatcher
+import kotlinx.coroutines.Dispatchers
+
+internal class DefaultDispatcherProvider : DispatcherProvider {
+    override val main: CoroutineDispatcher = Dispatchers.Main
+    override val default: CoroutineDispatcher = Dispatchers.Default
+    override val io: CoroutineDispatcher = ioDispatcher
+}

core/coroutines/src/commonMain/kotlin/fr/ajaury/gwenedeg/core/coroutines/data/IoDispatcher.kt

@@ -0,0 +1,5 @@
+package fr.ajaury.gwenedeg.core.coroutines.data
+
+import kotlinx.coroutines.CoroutineDispatcher
+
+internal expect val ioDispatcher: CoroutineDispatcher

core/coroutines/src/commonMain/kotlin/fr/ajaury/gwenedeg/core/coroutines/di/CoroutinesModule.kt

@@ -0,0 +1,10 @@
+package fr.ajaury.gwenedeg.core.coroutines.di
+
+import fr.ajaury.gwenedeg.core.coroutines.data.DefaultDispatcherProvider
+import fr.ajaury.gwenedeg.core.coroutines.domain.DispatcherProvider
+import org.koin.core.module.Module
+import org.koin.dsl.module
+
+val coroutinesModule: Module = module {
+    single<DispatcherProvider> { DefaultDispatcherProvider() }
+}

core/coroutines/src/commonMain/kotlin/fr/ajaury/gwenedeg/core/coroutines/domain/DispatcherProvider.kt

@@ -0,0 +1,9 @@
+package fr.ajaury.gwenedeg.core.coroutines.domain
+
+import kotlinx.coroutines.CoroutineDispatcher
+
+interface DispatcherProvider {
+    val main: CoroutineDispatcher
+    val default: CoroutineDispatcher
+    val io: CoroutineDispatcher
+}

core/coroutines/src/iosMain/kotlin/fr/ajaury/gwenedeg/core/coroutines/data/IoDispatcher.ios.kt

@@ -0,0 +1,8 @@
+package fr.ajaury.gwenedeg.core.coroutines.data
+
+import kotlinx.coroutines.CoroutineDispatcher
+import kotlinx.coroutines.Dispatchers
+
+// `Dispatchers.IO` is not public API on Native; `Dispatchers.Default` is multi-threaded here, so it
+// still runs work off the main thread.
+internal actual val ioDispatcher: CoroutineDispatcher = Dispatchers.Default

core/coroutines/src/jsMain/kotlin/fr/ajaury/gwenedeg/core/coroutines/data/IoDispatcher.js.kt

@@ -0,0 +1,7 @@
+package fr.ajaury.gwenedeg.core.coroutines.data
+
+import kotlinx.coroutines.CoroutineDispatcher
+import kotlinx.coroutines.Dispatchers
+
+// JS is single-threaded; there is no dedicated I/O dispatcher, use default.
+internal actual val ioDispatcher: CoroutineDispatcher = Dispatchers.Default

core/coroutines/src/jvmMain/kotlin/fr/ajaury/gwenedeg/core/coroutines/data/IoDispatcher.jvm.kt

@@ -0,0 +1,6 @@
+package fr.ajaury.gwenedeg.core.coroutines.data
+
+import kotlinx.coroutines.CoroutineDispatcher
+import kotlinx.coroutines.Dispatchers
+
+internal actual val ioDispatcher: CoroutineDispatcher = Dispatchers.IO

core/coroutines/src/wasmJsMain/kotlin/fr/ajaury/gwenedeg/core/coroutines/data/IoDispatcher.wasmJs.kt

@@ -0,0 +1,7 @@
+package fr.ajaury.gwenedeg.core.coroutines.data
+
+import kotlinx.coroutines.CoroutineDispatcher
+import kotlinx.coroutines.Dispatchers
+
+// Wasm is single-threaded; there is no dedicated I/O dispatcher, use default
+internal actual val ioDispatcher: CoroutineDispatcher = Dispatchers.Default

data/subtitle/build.gradle.kts

@@ -39,9 +39,13 @@ kotlin {
 
     sourceSets {
         commonMain.dependencies {
-            // Logging
+            // Core modules
+            implementation(projects.core.coroutines)
             implementation(projects.core.logging)
 
+            // Coroutines
+            implementation(libs.kotlinx.coroutinesCore)
+
             // DI
             implementation(project.dependencies.platform(libs.koin.bom))
             implementation(libs.koin.core)

data/subtitle/src/commonMain/kotlin/fr/ajaury/gwenedeg/subtitle/data/LrcSubtitleRepository.kt

@@ -1,20 +1,25 @@
 package fr.ajaury.gwenedeg.subtitle.data
 
+import fr.ajaury.gwenedeg.core.coroutines.domain.DispatcherProvider
 import fr.ajaury.gwenedeg.core.logging.domain.Logger
 import fr.ajaury.gwenedeg.subtitle.domain.Subtitle
 import fr.ajaury.gwenedeg.subtitle.domain.SubtitleRepository
 import fr.ajaury.gwenedeg.subtitle.model.CantGetSubtitleException
+import kotlinx.coroutines.withContext
 
 internal class LrcSubtitleRepository(
     private val parser: LrcParser,
+    private val dispatcherProvider: DispatcherProvider,
     private val logger: Logger,
 ) : SubtitleRepository {
     override suspend fun getSubtitle(content: String): Subtitle =
-        try {
-            parser.parse(content = content)
-        } catch (exception: Exception) {
-            val message = "Failed to load subtitle: $content"
-            logger.error(message = message, throwable = exception)
-            throw CantGetSubtitleException(message)
+        withContext(dispatcherProvider.default) {
+            try {
+                parser.parse(content = content)
+            } catch (exception: Exception) {
+                val message = "Failed to load subtitle: $content"
+                logger.error(message = message, throwable = exception)
+                throw CantGetSubtitleException(message)
+            }
         }
 }

settings.gradle.kts

@@ -39,6 +39,7 @@ include(":shared")
 
 // Core modules
 include(":core:audioplayer")
+include(":core:coroutines")
 include(":core:logging")
 
 // Data modules

shared/build.gradle.kts

@@ -60,6 +60,7 @@ kotlin {
         commonMain.dependencies {
             // Core modules
             implementation(projects.core.audioplayer)
+            implementation(projects.core.coroutines)
             implementation(projects.core.logging)
 
             // Data modules

shared/src/commonMain/kotlin/fr/ajaury/gwenedeg/App.kt

@@ -7,6 +7,7 @@ import androidx.compose.ui.tooling.preview.Preview
 import androidx.navigation3.runtime.NavEntry
 import androidx.navigation3.ui.NavDisplay
 import androidx.savedstate.compose.serialization.serializers.SnapshotStateListSerializer
+import fr.ajaury.gwenedeg.core.coroutines.di.coroutinesModule
 import fr.ajaury.gwenedeg.core.logging.di.loggingModule
 import fr.ajaury.gwenedeg.di.sharedModule
 import fr.ajaury.gwenedeg.navigation.Route
@@ -26,6 +27,7 @@ fun App() {
             modules(
                 sharedModule,
                 audioPlayerModule,
+                coroutinesModule,
                 loggingModule,
                 subtitleModule
             )

shared/src/commonMain/kotlin/fr/ajaury/gwenedeg/resourcereader/data/ComposeResourceReader.kt

@@ -1,8 +1,15 @@
 package fr.ajaury.gwenedeg.resourcereader.data
 
+import fr.ajaury.gwenedeg.core.coroutines.domain.DispatcherProvider
 import fr.ajaury.gwenedeg.resourcereader.data.domain.ResourceReader
 import gwenedeg.shared.generated.resources.Res
+import kotlinx.coroutines.withContext
 
-internal class ComposeResourceReader : ResourceReader {
-    override suspend fun read(resourcePath: String): String = Res.readBytes(resourcePath).decodeToString()
+internal class ComposeResourceReader(
+    private val dispatcherProvider: DispatcherProvider,
+) : ResourceReader {
+    override suspend fun read(resourcePath: String): String =
+        withContext(dispatcherProvider.io) {
+            Res.readBytes(resourcePath).decodeToString()
+        }
 }