Problem saving data into room db from paging library api response - kotlin

Question

I have an application built using Jetpack Compose , where i also use paging library 3 to fetch data from db , i have multiple remote mediator where i fetch data and save it directly into database , the issue is that sometimes data gets saved , sometimes not , it goes to the point that sometimes one of the two only gets data stored.
Remote Mediator 1:
#ExperimentalPagingApi
class PopularClothingRemoteMediator #Inject constructor(
private val clothingApi: ClothingApi,
private val clothingDatabase: ClothingDatabase
) : RemoteMediator<Int, Clothing>(){
private val clothingDao = clothingDatabase.clothingDao()
private val clothingRemoteKeysDao = clothingDatabase.clothingRemoteKeysDao()
override suspend fun initialize(): InitializeAction {
val currentTime = System.currentTimeMillis()
val lastUpdated = clothingRemoteKeysDao.getRemoteKeys(clothingId = 1)?.lastUpdated ?: 0L
val cacheTimeout = 1440
val diffInMinutes = (currentTime - lastUpdated) / 1000 / 60
return if (diffInMinutes.toInt() <= cacheTimeout) {
// Log.d("RemoteMediator", "UP TO DATE")
InitializeAction.SKIP_INITIAL_REFRESH
} else {
// Log.d("RemoteMediator", "REFRESH")
InitializeAction.LAUNCH_INITIAL_REFRESH
}
}
override suspend fun load(loadType: LoadType, state: PagingState<Int, Clothing>): MediatorResult {
return try {
val page = when (loadType) {
LoadType.REFRESH -> {
val remoteKeys = getRemoteKeyClosestToCurrentPosition(state)
remoteKeys?.nextPage?.minus(1) ?: 1
}
LoadType.PREPEND -> {
val remoteKeys = getRemoteKeyForFirstItem(state)
val prevPage = remoteKeys?.prevPage
?: return MediatorResult.Success(
endOfPaginationReached = remoteKeys != null
)
prevPage
}
LoadType.APPEND -> {
val remoteKeys = getRemoteKeyForLastItem(state)
val nextPage = remoteKeys?.nextPage
?: return MediatorResult.Success(
endOfPaginationReached = remoteKeys != null
)
nextPage
}
}
val response = clothingApi.getPopularClothing(page = page)
if (response.popularClothing.isNotEmpty()) {
clothingDatabase.withTransaction {
if (loadType == LoadType.REFRESH) {
clothingDao.deleteAllClothing()
clothingRemoteKeysDao.deleteAllRemoteKeys()
}
val prevPage = response.prevPage
val nextPage = response.nextPage
val keys = response.popularClothing.map { clothing ->
ClothingRemoteKeys(
clothingId = clothing.clothingId,
prevPage = prevPage,
nextPage = nextPage,
lastUpdated = response.lastUpdated
)
}
// When i debug this code , it works fine and the last line is executed
// the issue data sometimes gets saved , sometimes not
clothingRemoteKeysDao.addAllRemoteKeys(clothingRemoteKeys = keys)
clothingDao.addClothing(clothing = response.popularClothing)
}
}
MediatorResult.Success(endOfPaginationReached = response.nextPage == null)
} catch (e: Exception) {
return MediatorResult.Error(e)
}
}
private suspend fun getRemoteKeyClosestToCurrentPosition(
state: PagingState<Int, Clothing>
): ClothingRemoteKeys? {
return state.anchorPosition?.let { position ->
state.closestItemToPosition(position)?.clothingId?.let { clothingId ->
clothingRemoteKeysDao.getRemoteKeys(clothingId = clothingId)
}
}
}
private suspend fun getRemoteKeyForFirstItem(
state: PagingState<Int, Clothing>
): ClothingRemoteKeys? {
return state.pages.firstOrNull { it.data.isNotEmpty() }?.data?.firstOrNull()
?.let { clothing ->
clothingRemoteKeysDao.getRemoteKeys(clothingId = clothing.clothingId)
}
}
private suspend fun getRemoteKeyForLastItem(
state: PagingState<Int, Clothing>
): ClothingRemoteKeys? {
return state.pages.lastOrNull { it.data.isNotEmpty() }?.data?.lastOrNull()
?.let { clothing ->
clothingRemoteKeysDao.getRemoteKeys(clothingId = clothing.clothingId)
}
}
}
Remote Mediator 2:
class OuterwearRemoteMediator #Inject constructor(
private val clothingApi: ClothingApi,
private val clothingDatabase: ClothingDatabase
) : RemoteMediator<Int, Clothing>() {
private val clothingDao = clothingDatabase.clothingDao()
private val clothingRemoteKeysDao = clothingDatabase.clothingRemoteKeysDao()
override suspend fun initialize(): InitializeAction {
val currentTime = System.currentTimeMillis()
val lastUpdated = clothingRemoteKeysDao.getRemoteKeys(clothingId = 1)?.lastUpdated ?: 0L
val cacheTimeout = 1440
val diffInMinutes = (currentTime - lastUpdated) / 1000 / 60
return if (diffInMinutes.toInt() <= cacheTimeout) {
// Log.d("RemoteMediator", "UP TO DATE")
InitializeAction.SKIP_INITIAL_REFRESH
} else {
// Log.d("RemoteMediator", "REFRESH")
InitializeAction.LAUNCH_INITIAL_REFRESH
}
}
override suspend fun load(loadType: LoadType, state: PagingState<Int, Clothing>): MediatorResult {
return try {
val page = when (loadType) {
LoadType.REFRESH -> {
val remoteKeys = getRemoteKeyClosestToCurrentPosition(state)
remoteKeys?.nextPage?.minus(1) ?: 1
}
LoadType.PREPEND -> {
val remoteKeys = getRemoteKeyForFirstItem(state)
val prevPage = remoteKeys?.prevPage
?: return MediatorResult.Success(
endOfPaginationReached = remoteKeys != null
)
prevPage
}
LoadType.APPEND -> {
val remoteKeys = getRemoteKeyForLastItem(state)
val nextPage = remoteKeys?.nextPage
?: return MediatorResult.Success(endOfPaginationReached = remoteKeys != null)
nextPage
}
}
val response = clothingApi.getOuterwear(page = page)
if (response.outerwear.isNotEmpty()) {
clothingDatabase.withTransaction {
if (loadType == LoadType.REFRESH) {
clothingDao.deleteAllClothing()
clothingRemoteKeysDao.deleteAllRemoteKeys()
}
val prevPage = response.prevPage
val nextPage = response.nextPage
val keys = response.outerwear.map { clothing ->
ClothingRemoteKeys(
clothingId = clothing.clothingId,
prevPage = prevPage,
nextPage = nextPage,
lastUpdated = response.lastUpdated
)
}
// the same thing here
// When i debug this code , it works fine and the last line is executed
// the issue data sometimes gets saved , sometimes not
clothingRemoteKeysDao.addAllRemoteKeys(clothingRemoteKeys = keys)
clothingDao.addClothing(clothing = response.outerwear)
}
}
MediatorResult.Success(endOfPaginationReached = response.nextPage == null)
} catch (e: Exception) {
return MediatorResult.Error(e)
}
}
private suspend fun getRemoteKeyClosestToCurrentPosition(
state: PagingState<Int, Clothing>): ClothingRemoteKeys? {
return state.anchorPosition?.let { position ->
state.closestItemToPosition(position)?.clothingId?.let { clothingId ->
clothingRemoteKeysDao.getRemoteKeys(clothingId = clothingId)
}
}
}
private suspend fun getRemoteKeyForFirstItem(
state: PagingState<Int, Clothing>): ClothingRemoteKeys? {
return state.pages.firstOrNull { it.data.isNotEmpty() }?.data?.firstOrNull()
?.let { clothing ->
clothingRemoteKeysDao.getRemoteKeys(clothingId = clothing.clothingId)
}
}
private suspend fun getRemoteKeyForLastItem(
state: PagingState<Int, Clothing>
): ClothingRemoteKeys? {
return state.pages.lastOrNull { it.data.isNotEmpty() }?.data?.lastOrNull()
?.let { clothing ->
clothingRemoteKeysDao.getRemoteKeys(clothingId = clothing.clothingId)
}
}