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Avoid concurrency issues when reordering categories

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Maybe fixes #8372
This commit is contained in:
arkon 2022-11-22 23:12:23 -05:00
parent 5c37347cec
commit e2179a6669
4 changed files with 53 additions and 37 deletions
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40
app/src/main/java/eu/kanade/domain/category/interactor/ReorderCategory.kt
View file

@ -5,25 +5,42 @@ import eu.kanade.domain.category.model.CategoryUpdate
import eu.kanade.domain.category.repository.CategoryRepository
import eu.kanade.tachiyomi.util.lang.withNonCancellableContext
import eu.kanade.tachiyomi.util.system.logcat
import kotlinx.coroutines.sync.Mutex
import kotlinx.coroutines.sync.withLock
import logcat.LogPriority
import java.util.Collections
class ReorderCategory(
private val categoryRepository: CategoryRepository,
) {
suspend fun await(categoryId: Long, newPosition: Int) = withNonCancellableContext {
val categories = categoryRepository.getAll().filterNot(Category::isSystemCategory)
private val mutex = Mutex()
val currentIndex = categories.indexOfFirst { it.id == categoryId }
suspend fun moveUp(category: Category): Result =
await(category, MoveTo.UP)
suspend fun moveDown(category: Category): Result =
await(category, MoveTo.DOWN)
private suspend fun await(category: Category, moveTo: MoveTo) = withNonCancellableContext {
mutex.withLock {
val categories = categoryRepository.getAll()
.filterNot(Category::isSystemCategory)
.toMutableList()
val newPosition = when (moveTo) {
MoveTo.UP -> category.order - 1
MoveTo.DOWN -> category.order + 1
}.toInt()
val currentIndex = categories.indexOfFirst { it.id == category.id }
if (currentIndex == newPosition) {
return@withNonCancellableContext Result.Unchanged
}
val reorderedCategories = categories.toMutableList()
val reorderedCategory = reorderedCategories.removeAt(currentIndex)
reorderedCategories.add(newPosition, reorderedCategory)
Collections.swap(categories, currentIndex, newPosition)
val updates = reorderedCategories.mapIndexed { index, category ->
val updates = categories.mapIndexed { index, category ->
CategoryUpdate(
id = category.id,
order = index.toLong(),
@ -38,13 +55,16 @@ class ReorderCategory(
Result.InternalError(e)
}
}
suspend fun await(category: Category, newPosition: Long): Result =
await(category.id, newPosition.toInt())
}
sealed class Result {
object Success : Result()
object Unchanged : Result()
data class InternalError(val error: Throwable) : Result()
}
private enum class MoveTo {
UP,
DOWN,
}
}

3
app/src/main/java/eu/kanade/presentation/components/ChangeCategoryDialog.kt
View file

@ -96,8 +96,7 @@ fun ChangeCategoryDialog(
val index = selection.indexOf(it)
if (index != -1) {
val mutableList = selection.toMutableList()
mutableList.removeAt(index)
mutableList.add(index, it.next())
mutableList[index] = it.next()
selection = mutableList.toList()
}
}

3
app/src/main/java/eu/kanade/presentation/components/DeleteLibraryMangaDialog.kt
View file

@ -64,8 +64,7 @@ fun DeleteLibraryMangaDialog(
val onCheck = {
val index = list.indexOf(state)
val mutableList = list.toMutableList()
mutableList.removeAt(index)
mutableList.add(index, state.next() as CheckboxState.State<Int>)
mutableList[index] = state.next() as CheckboxState.State<Int>
list = mutableList.toList()
}

16
app/src/main/java/eu/kanade/tachiyomi/ui/category/CategoryScreenModel.kt
View file

@ -48,7 +48,7 @@ class CategoryScreenModel(
when (createCategoryWithName.await(name)) {
is CreateCategoryWithName.Result.InternalError -> _events.send(CategoryEvent.InternalError)
CreateCategoryWithName.Result.NameAlreadyExistsError -> _events.send(CategoryEvent.CategoryWithNameAlreadyExists)
CreateCategoryWithName.Result.Success -> {}
else -> {}
}
}
}
@ -57,27 +57,25 @@ class CategoryScreenModel(
coroutineScope.launch {
when (deleteCategory.await(categoryId = categoryId)) {
is DeleteCategory.Result.InternalError -> _events.send(CategoryEvent.InternalError)
DeleteCategory.Result.Success -> {}
else -> {}
}
}
}
fun moveUp(category: Category) {
coroutineScope.launch {
when (reorderCategory.await(category, category.order - 1)) {
when (reorderCategory.moveUp(category)) {
is ReorderCategory.Result.InternalError -> _events.send(CategoryEvent.InternalError)
ReorderCategory.Result.Success -> {}
ReorderCategory.Result.Unchanged -> {}
else -> {}
}
}
}
fun moveDown(category: Category) {
coroutineScope.launch {
when (reorderCategory.await(category, category.order + 1)) {
when (reorderCategory.moveDown(category)) {
is ReorderCategory.Result.InternalError -> _events.send(CategoryEvent.InternalError)
ReorderCategory.Result.Success -> {}
ReorderCategory.Result.Unchanged -> {}
else -> {}
}
}
}
@ -87,7 +85,7 @@ class CategoryScreenModel(
when (renameCategory.await(category, name)) {
is RenameCategory.Result.InternalError -> _events.send(CategoryEvent.InternalError)
RenameCategory.Result.NameAlreadyExistsError -> _events.send(CategoryEvent.CategoryWithNameAlreadyExists)
RenameCategory.Result.Success -> {}
else -> {}
}
}
}