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feat: separate db reads and writes to separate dispatchers

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This commit is contained in:
Harsh Shandilya 2025-03-11 17:32:56 +05:30
parent f818da6f64
commit 976c9dd064
5 changed files with 38 additions and 20 deletions
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10
android/src/main/kotlin/dev/msfjarvis/claw/android/viewmodel/CommentsRepository.kt
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@ -6,7 +6,8 @@
*/
package dev.msfjarvis.claw.android.viewmodel
import dev.msfjarvis.claw.core.injection.DatabaseDispatcher
import dev.msfjarvis.claw.core.injection.DatabaseReadDispatcher
import dev.msfjarvis.claw.core.injection.DatabaseWriteDispatcher
import dev.msfjarvis.claw.database.local.PostComments
import dev.msfjarvis.claw.database.local.PostCommentsQueries
import dev.msfjarvis.claw.model.Comment
@ -18,14 +19,15 @@ class CommentsRepository
@Inject
constructor(
private val postCommentsQueries: PostCommentsQueries,
@DatabaseDispatcher private val dbDispatcher: CoroutineDispatcher,
@DatabaseReadDispatcher private val readDispatcher: CoroutineDispatcher,
@DatabaseWriteDispatcher private val writeDispatcher: CoroutineDispatcher,
) {
suspend fun getSeenComments(postId: String) =
withContext(dbDispatcher) { postCommentsQueries.getCommentIds(postId).executeAsOneOrNull() }
withContext(readDispatcher) { postCommentsQueries.getCommentIds(postId).executeAsOneOrNull() }
suspend fun markSeenComments(postId: String, comments: List<Comment>) {
withContext(dbDispatcher) {
withContext(writeDispatcher) {
postCommentsQueries.rememberComments(PostComments(postId, comments.map { it.shortId }))
}
}

10
android/src/main/kotlin/dev/msfjarvis/claw/android/viewmodel/ReadPostsRepository.kt
View file

@ -8,7 +8,8 @@ package dev.msfjarvis.claw.android.viewmodel
import app.cash.sqldelight.coroutines.asFlow
import app.cash.sqldelight.coroutines.mapToList
import dev.msfjarvis.claw.core.injection.DatabaseDispatcher
import dev.msfjarvis.claw.core.injection.DatabaseReadDispatcher
import dev.msfjarvis.claw.core.injection.DatabaseWriteDispatcher
import dev.msfjarvis.claw.database.local.ReadPostsQueries
import javax.inject.Inject
import kotlinx.coroutines.CoroutineDispatcher
@ -18,11 +19,12 @@ class ReadPostsRepository
@Inject
constructor(
private val readPostsQueries: ReadPostsQueries,
@DatabaseDispatcher private val dbDispatcher: CoroutineDispatcher,
@DatabaseReadDispatcher private val readDispatcher: CoroutineDispatcher,
@DatabaseWriteDispatcher private val writeDispatcher: CoroutineDispatcher,
) {
val readPosts = readPostsQueries.selectAllPosts().asFlow().mapToList(dbDispatcher)
val readPosts = readPostsQueries.selectAllPosts().asFlow().mapToList(readDispatcher)
suspend fun markRead(postId: String) {
withContext(dbDispatcher) { readPostsQueries.markRead(postId) }
withContext(writeDispatcher) { readPostsQueries.markRead(postId) }
}
}

14
android/src/main/kotlin/dev/msfjarvis/claw/android/viewmodel/SavedPostsRepository.kt
View file

@ -8,7 +8,8 @@ package dev.msfjarvis.claw.android.viewmodel
import app.cash.sqldelight.coroutines.asFlow
import app.cash.sqldelight.coroutines.mapToList
import dev.msfjarvis.claw.core.injection.DatabaseDispatcher
import dev.msfjarvis.claw.core.injection.DatabaseReadDispatcher
import dev.msfjarvis.claw.core.injection.DatabaseWriteDispatcher
import dev.msfjarvis.claw.database.local.SavedPost
import dev.msfjarvis.claw.database.local.SavedPostQueries
import dev.msfjarvis.claw.model.UIPost
@ -23,23 +24,24 @@ class SavedPostsRepository
@Inject
constructor(
private val savedPostQueries: SavedPostQueries,
@DatabaseDispatcher private val dbDispatcher: CoroutineDispatcher,
@DatabaseReadDispatcher private val readDispatcher: CoroutineDispatcher,
@DatabaseWriteDispatcher private val writeDispatcher: CoroutineDispatcher,
) {
val savedPosts = savedPostQueries.selectAllPosts().asFlow().mapToList(dbDispatcher)
val savedPosts = savedPostQueries.selectAllPosts().asFlow().mapToList(readDispatcher)
suspend fun toggleSave(post: UIPost) {
if (savedPosts.firstOrNull().orEmpty().any { it.shortId == post.shortId }) {
Napier.d(tag = TAG) { "Removing post: ${post.shortId}" }
withContext(dbDispatcher) { savedPostQueries.deletePost(post.shortId) }
withContext(writeDispatcher) { savedPostQueries.deletePost(post.shortId) }
} else {
Napier.d(tag = TAG) { "Saving post: ${post.shortId}" }
withContext(dbDispatcher) { savedPostQueries.insertOrReplacePost(post.toSavedPost()) }
withContext(writeDispatcher) { savedPostQueries.insertOrReplacePost(post.toSavedPost()) }
}
}
suspend fun savePosts(posts: List<SavedPost>) {
Napier.d(tag = TAG) { "Saving posts: ${posts.joinToString(",") { it.shortId }}" }
withContext(dbDispatcher) {
withContext(writeDispatcher) {
savedPostQueries.transaction {
posts.forEach { post -> savedPostQueries.insertOrReplacePost(post) }
}

7
core/src/main/kotlin/dev/msfjarvis/claw/core/coroutines/DispatcherProvider.kt
View file

@ -21,8 +21,11 @@ interface DispatcherProvider {
fun io(): CoroutineDispatcher = Dispatchers.IO
fun database(): CoroutineDispatcher =
Dispatchers.IO.limitedParallelism(1, name = "DatabaseDispatcher")
fun databaseRead(): CoroutineDispatcher =
Dispatchers.IO.limitedParallelism(4, name = "DatabaseRead")
fun databaseWrite(): CoroutineDispatcher =
Dispatchers.IO.limitedParallelism(1, name = "DatabaseWrite")
}
/** Concrete type for [DispatcherProvider] with all the defaults from the class. */

17
core/src/main/kotlin/dev/msfjarvis/claw/core/injection/CoroutineDispatcherModule.kt
View file

@ -16,7 +16,9 @@ import dev.msfjarvis.claw.core.coroutines.DispatcherProvider
import javax.inject.Qualifier
import kotlinx.coroutines.CoroutineDispatcher
@Qualifier @Retention(AnnotationRetention.RUNTIME) annotation class DatabaseDispatcher
@Qualifier @Retention(AnnotationRetention.RUNTIME) annotation class DatabaseReadDispatcher
@Qualifier @Retention(AnnotationRetention.RUNTIME) annotation class DatabaseWriteDispatcher
@Qualifier @Retention(AnnotationRetention.RUNTIME) annotation class MainDispatcher
@ -36,9 +38,16 @@ interface CoroutineDispatcherModule {
return dispatcherProvider.io()
}
@[Provides DatabaseDispatcher]
fun provideDatabaseDispatcher(dispatcherProvider: DispatcherProvider): CoroutineDispatcher {
return dispatcherProvider.database()
@[Provides DatabaseReadDispatcher]
fun provideDatabaseReadDispatcher(dispatcherProvider: DispatcherProvider): CoroutineDispatcher {
return dispatcherProvider.databaseRead()
}
@[Provides DatabaseWriteDispatcher]
fun provideDatabaseWriteDispatcher(
dispatcherProvider: DispatcherProvider
): CoroutineDispatcher {
return dispatcherProvider.databaseWrite()
}
@[Provides MainDispatcher]