Rewrite SuggestionsCache & limit parallelism (#851)

## Description
A rewrite of the `SuggestionsCache` to simplify it as a read-through
cache. The downside of this is that updated suggestions won't be
reflected in the UI unless the user reloads the page, but I think that's
an okay trade off.

Also adds parallelism limits to fetching suggestions to reduce the
number of simultaneous API calls. And moved the combining logic to use
the `Default` dispatcher to free up an IO one.

Also adds an initial delay to both the suggestions & tv provider
workers, so a cold start of the app isn't starved.

### Related issues
Related to #849

### Testing
Emulator & unit testing

## Screenshots
N/A

## AI or LLM usage
None

app/build.gradle.kts

@@ -285,6 +285,8 @@ dependencies {
     ksp(libs.auto.service.ksp)
     implementation(platform(libs.okhttp.bom))
     implementation(libs.okhttp)
+    implementation(libs.kache)
+    implementation(libs.kache.file)
 
     androidTestImplementation(platform(libs.androidx.compose.bom))
     androidTestImplementation(libs.androidx.compose.ui.test.junit4)

app/src/main/java/com/github/damontecres/wholphin/services/PlaybackLifecycleObserver.kt

@@ -4,9 +4,6 @@ import androidx.lifecycle.DefaultLifecycleObserver
 import androidx.lifecycle.LifecycleOwner
 import com.github.damontecres.wholphin.ui.nav.Destination
 import dagger.hilt.android.scopes.ActivityRetainedScoped
-import kotlinx.coroutines.CoroutineScope
-import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.launch
 import javax.inject.Inject
 
 /**
@@ -19,7 +16,6 @@ class PlaybackLifecycleObserver
         private val navigationManager: NavigationManager,
         private val playerFactory: PlayerFactory,
         private val themeSongPlayer: ThemeSongPlayer,
-        private val suggestionsCache: SuggestionsCache,
     ) : DefaultLifecycleObserver {
         private var wasPlaying: Boolean? = null
 
@@ -52,6 +48,5 @@ class PlaybackLifecycleObserver
 
         override fun onStop(owner: LifecycleOwner) {
             themeSongPlayer.stop()
-            CoroutineScope(Dispatchers.Main).launch { suggestionsCache.save() }
         }
     }

app/src/main/java/com/github/damontecres/wholphin/services/SuggestionService.kt

@@ -8,7 +8,6 @@ import com.github.damontecres.wholphin.data.model.BaseItem
 import com.github.damontecres.wholphin.util.GetItemsRequestHandler
 import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.flow.Flow
-import kotlinx.coroutines.flow.distinctUntilChanged
 import kotlinx.coroutines.flow.flatMapLatest
 import kotlinx.coroutines.flow.flow
 import kotlinx.coroutines.flow.flowOf
@@ -50,15 +49,15 @@ class SuggestionService
                 .asFlow()
                 .flatMapLatest { user ->
                     val userId = user?.id ?: return@flatMapLatest flowOf(SuggestionsResource.Empty)
-
+                    val cachedIds = cache.get(userId, parentId, itemKind)?.ids.orEmpty()
-                    cache.cacheVersion
-                        .map { cache.get(userId, parentId, itemKind)?.ids.orEmpty() }
-                        .distinctUntilChanged()
-                        .flatMapLatest { cachedIds ->
                     if (cachedIds.isNotEmpty()) {
                         flow {
                             try {
-                                        emit(SuggestionsResource.Success(fetchItemsByIds(cachedIds, itemKind)))
+                                emit(
+                                    SuggestionsResource.Success(
+                                        fetchItemsByIds(cachedIds, itemKind),
+                                    ),
+                                )
                             } catch (e: Exception) {
                                 Timber.e(e, "Failed to fetch items")
                                 emit(SuggestionsResource.Empty)
@@ -77,7 +76,6 @@ class SuggestionService
                     }
                 }
         }
-        }
 
         private suspend fun fetchItemsByIds(
             ids: List<UUID>,

app/src/main/java/com/github/damontecres/wholphin/services/SuggestionsCache.kt

@@ -4,15 +4,13 @@ package com.github.damontecres.wholphin.services
 
 import android.content.Context
 import com.github.damontecres.wholphin.ui.toServerString
+import com.mayakapps.kache.InMemoryKache
+import com.mayakapps.kache.ObjectKache
 import dagger.hilt.android.qualifiers.ApplicationContext
+import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.flow.MutableStateFlow
-import kotlinx.coroutines.flow.StateFlow
-import kotlinx.coroutines.flow.asStateFlow
-import kotlinx.coroutines.flow.update
 import kotlinx.coroutines.sync.Mutex
 import kotlinx.coroutines.sync.withLock
-import kotlinx.coroutines.withContext
 import kotlinx.serialization.ExperimentalSerializationApi
 import kotlinx.serialization.Serializable
 import kotlinx.serialization.UseSerializers
@@ -38,38 +36,14 @@ class SuggestionsCache
     constructor(
         @param:ApplicationContext private val context: Context,
     ) {
+        private val cacheDir: File
+            get() = File(context.cacheDir, "suggestions")
         private val json = Json { ignoreUnknownKeys = true }
-        private val _cacheVersion = MutableStateFlow(0L)
-        val cacheVersion: StateFlow<Long> = _cacheVersion.asStateFlow()
-
-        private val memoryCache: MutableMap<String, CachedSuggestions> =
-            LinkedHashMap(MAX_MEMORY_CACHE_SIZE, 0.75f, true)
-
-        @Volatile
-        private var diskCacheLoadedUserId: UUID? = null
-        private val dirtyKeys: MutableSet<String> = mutableSetOf()
         private val mutex = Mutex()
 
-        @OptIn(ExperimentalSerializationApi::class)
+        private val memoryCache =
-        private fun writeEntryToDisk(
+            InMemoryKache<String, CachedSuggestions>(maxSize = 8) {
-            key: String,
+                creationScope = CoroutineScope(Dispatchers.IO)
-            cached: CachedSuggestions,
-        ) {
-            runCatching {
-                val suggestionsDir = cacheDir.apply { mkdirs() }
-                File(suggestionsDir, "$key.json")
-                    .outputStream()
-                    .use { json.encodeToStream(cached, it) }
-            }.onFailure { Timber.w(it, "Failed to write evicted cache: $key") }
-        }
-
-        private fun checkForEviction(newKey: String): Pair<String, CachedSuggestions>? {
-            if (memoryCache.containsKey(newKey) || memoryCache.size < MAX_MEMORY_CACHE_SIZE) {
-                return null
-            }
-            val eldest = memoryCache.entries.firstOrNull() ?: return null
-            memoryCache.remove(eldest.key)
-            return if (dirtyKeys.remove(eldest.key)) eldest.key to eldest.value else null
             }
 
         private fun cacheKey(
@@ -78,63 +52,28 @@ class SuggestionsCache
             itemKind: BaseItemKind,
         ) = "${userId.toServerString()}_${libraryId.toServerString()}_${itemKind.serialName}"
 
-        private val cacheDir: File
-            get() = File(context.cacheDir, "suggestions")
-
-        @OptIn(ExperimentalSerializationApi::class)
-        private suspend fun loadFromDisk(userId: UUID) {
-            if (diskCacheLoadedUserId == userId) return
-            mutex.withLock {
-                if (diskCacheLoadedUserId == userId) return@withLock
-                withContext(Dispatchers.IO) {
-                    val suggestionsDir = cacheDir
-                    if (!suggestionsDir.exists()) {
-                        diskCacheLoadedUserId = userId
-                        return@withContext
-                    }
-                    memoryCache.clear()
-                    suggestionsDir
-                        .listFiles {
-                            it.name.startsWith(userId.toServerString())
-                        }.orEmpty()
-                        .take(MAX_MEMORY_CACHE_SIZE)
-                        .forEach { file ->
-                            runCatching {
-                                val key = file.nameWithoutExtension
-                                val cached =
-                                    file
-                                        .inputStream()
-                                        .use { json.decodeFromStream<CachedSuggestions>(it) }
-                                memoryCache[key] = cached
-                            }.onFailure { Timber.w(it, "Failed to read cache file: ${file.name}") }
-                        }
-                    diskCacheLoadedUserId = userId
-                }
-            }
-        }
-
         @OptIn(ExperimentalSerializationApi::class)
         suspend fun get(
             userId: UUID,
             libraryId: UUID,
             itemKind: BaseItemKind,
         ): CachedSuggestions? {
-            loadFromDisk(userId)
             val key = cacheKey(userId, libraryId, itemKind)
-            memoryCache[key]?.let { return it }
+            return memoryCache.getOrPut(key) {
-            return withContext(Dispatchers.IO) {
+                try {
-                runCatching {
+                    mutex.withLock {
-                    File(cacheDir, "$key.json")
+                        File(cacheDir, "$key.json").inputStream().use {
-                        .takeIf { it.exists() }
-                        ?.inputStream()
-                        ?.use {
                             json.decodeFromStream<CachedSuggestions>(it)
-                        }?.also { memoryCache[key] = it }
+                        }
-                }.onFailure { Timber.w(it, "Failed to read cache: $key") }
+                    }
-                    .getOrNull()
+                } catch (ex: Exception) {
+                    Timber.e(ex, "Exception reading from disk cache")
+                    null
+                }
             }
         }
 
+        @OptIn(ExperimentalSerializationApi::class)
         suspend fun put(
             userId: UUID,
             libraryId: UUID,
@@ -142,75 +81,23 @@ class SuggestionsCache
             ids: List<UUID>,
         ) {
             val key = cacheKey(userId, libraryId, itemKind)
-            val cached = CachedSuggestions(ids)
+            val suggestions = CachedSuggestions(ids)
-            val evictedEntry =
+            memoryCache.put(key, suggestions)
+            try {
+                cacheDir.mkdirs()
                 mutex.withLock {
-                    val evicted = checkForEviction(key)
+                    File(cacheDir, "$key.json").outputStream().use {
-                    memoryCache[key] = cached
+                        json.encodeToStream(suggestions, it)
-                    dirtyKeys.add(key)
-                    _cacheVersion.update { it + 1 }
-                    evicted
                     }
-            evictedEntry?.let { (evictedKey, evictedValue) ->
+                }
-                withContext(Dispatchers.IO) {
+            } catch (ex: Exception) {
-                    writeEntryToDisk(evictedKey, evictedValue)
+                Timber.e(ex, "Exception writing to disk cache")
             }
         }
     }
 
-        suspend fun isEmpty(): Boolean =
+fun ObjectKache<*, *>.isEmpty(): Boolean = this.size == 0L
-            mutex.withLock {
-                if (memoryCache.isNotEmpty() || dirtyKeys.isNotEmpty()) {
-                    return@withLock false
-                }
-                withContext(Dispatchers.IO) {
-                    val files = cacheDir.listFiles()
-                    files == null || files.isEmpty()
-                }
-            }
 
-        @OptIn(ExperimentalSerializationApi::class)
+fun ObjectKache<*, *>.isNotEmpty(): Boolean = !isEmpty()
-        suspend fun save() {
-            val entriesToSave =
-                mutex.withLock {
-                    if (dirtyKeys.isEmpty()) return
-                    val entries =
-                        dirtyKeys.mapNotNull { key ->
-                            memoryCache[key]?.let { key to it }
-                        }
-                    dirtyKeys.clear()
-                    entries
-                }
 
-            withContext(Dispatchers.IO) {
+suspend fun <T : Any> ObjectKache<T, *>.containsKey(key: T): Boolean = get(key) != null
-                val suggestionsDir =
-                    cacheDir.apply {
-                        if (!mkdirs() && !exists()) Timber.w("Failed to create suggestions cache directory")
-                    }
-                entriesToSave.forEach { (key, value) ->
-                    runCatching {
-                        File(suggestionsDir, "$key.json")
-                            .outputStream()
-                            .use { json.encodeToStream(value, it) }
-                    }.onFailure { Timber.w(it, "Failed to write cache: $key") }
-                }
-            }
-        }
-
-        suspend fun clear() {
-            mutex.withLock {
-                memoryCache.clear()
-                dirtyKeys.clear()
-                _cacheVersion.update { it + 1 }
-                diskCacheLoadedUserId = null
-            }
-            withContext(Dispatchers.IO) {
-                runCatching { cacheDir.deleteRecursively() }
-                    .onFailure { Timber.w(it, "Failed to clear suggestions cache") }
-            }
-        }
-
-        companion object {
-            private const val MAX_MEMORY_CACHE_SIZE = 8
-        }
-    }

app/src/main/java/com/github/damontecres/wholphin/services/SuggestionsSchedulerService.kt

@@ -80,13 +80,7 @@ class SuggestionsSchedulerService
                         BackoffPolicy.EXPONENTIAL,
                         15.minutes.toJavaDuration(),
                     ).setInputData(inputData)
-
+                    .setInitialDelay(60.seconds.toJavaDuration())
-            if (cache.isEmpty()) {
-                Timber.i("Suggestions cache empty, scheduling periodic fetch with 30s delay")
-                periodicWorkRequestBuilder.setInitialDelay(30.seconds.toJavaDuration())
-            } else {
-                Timber.i("Scheduling periodic SuggestionsWorker")
-            }
 
             workManager.enqueueUniquePeriodicWork(
                 uniqueWorkName = SuggestionsWorker.WORK_NAME,

app/src/main/java/com/github/damontecres/wholphin/services/SuggestionsWorker.kt

@@ -18,6 +18,7 @@ import kotlinx.coroutines.coroutineScope
 import kotlinx.coroutines.ensureActive
 import kotlinx.coroutines.flow.firstOrNull
 import kotlinx.coroutines.supervisorScope
+import kotlinx.coroutines.withContext
 import org.jellyfin.sdk.api.client.ApiClient
 import org.jellyfin.sdk.api.client.exception.ApiClientException
 import org.jellyfin.sdk.api.client.extensions.userViewsApi
@@ -31,6 +32,7 @@ import org.jellyfin.sdk.model.api.request.GetItemsRequest
 import org.jellyfin.sdk.model.serializer.toUUIDOrNull
 import timber.log.Timber
 import java.util.UUID
+import kotlin.coroutines.CoroutineContext
 
 private val BaseItemDto.relevantId: UUID get() = seriesId ?: id
 
@@ -79,6 +81,7 @@ class SuggestionsWorker
                 }
                 val results =
                     supervisorScope {
+                        val context = Dispatchers.IO.limitedParallelism(2, "fetchSuggestions")
                         views
                             .mapNotNull { view ->
                                 val itemKind =
@@ -90,7 +93,14 @@ class SuggestionsWorker
                                 async(Dispatchers.IO) {
                                     runCatching {
                                         Timber.v("Fetching suggestions for view %s", view.id)
-                                        val suggestions = fetchSuggestions(view.id, userId, itemKind, itemsPerRow)
+                                        val suggestions =
+                                            fetchSuggestions(
+                                                context,
+                                                view.id,
+                                                userId,
+                                                itemKind,
+                                                itemsPerRow,
+                                            )
                                         ensureActive()
                                         cache.put(
                                             userId,
@@ -110,7 +120,6 @@ class SuggestionsWorker
                     }
                 val successCount = results.count { it.isSuccess }
                 val failureCount = results.count { it.isFailure }
-                cache.save()
                 if (failureCount > 0 && successCount == 0) {
                     Timber.w("All attempts failed ($failureCount views), scheduling retry")
                     return Result.retry()
@@ -127,6 +136,7 @@ class SuggestionsWorker
         }
 
         private suspend fun fetchSuggestions(
+            coroutineContext: CoroutineContext,
             parentId: UUID,
             userId: UUID,
             itemKind: BaseItemKind,
@@ -141,7 +151,7 @@ class SuggestionsWorker
                 val freshLimit = (itemsPerRow * 0.3).toInt().coerceAtLeast(1)
 
                 val historyDeferred =
-                    async(Dispatchers.IO) {
+                    async(coroutineContext) {
                         fetchItems(
                             parentId = parentId,
                             userId = userId,
@@ -163,7 +173,7 @@ class SuggestionsWorker
                 val excludeIds = seedItems.mapTo(HashSet()) { it.relevantId }
 
                 val contextualDeferred =
-                    async(Dispatchers.IO) {
+                    async(coroutineContext) {
                         if (allGenreIds.isEmpty()) {
                             emptyList()
                         } else {
@@ -181,7 +191,7 @@ class SuggestionsWorker
                     }
 
                 val randomDeferred =
-                    async(Dispatchers.IO) {
+                    async(coroutineContext) {
                         fetchItems(
                             parentId = parentId,
                             userId = userId,
@@ -193,7 +203,7 @@ class SuggestionsWorker
                     }
 
                 val freshDeferred =
-                    async(Dispatchers.IO) {
+                    async(coroutineContext) {
                         fetchItems(
                             parentId = parentId,
                             userId = userId,
@@ -204,7 +214,7 @@ class SuggestionsWorker
                             limit = freshLimit,
                         )
                     }
-
+                withContext(Dispatchers.Default) {
                     val contextual = contextualDeferred.await()
                     val random = randomDeferred.await()
                     val fresh = freshDeferred.await()
@@ -217,6 +227,7 @@ class SuggestionsWorker
                         .shuffled()
                         .take(itemsPerRow)
                 }
+            }
 
         private suspend fun fetchItems(
             parentId: UUID,

app/src/main/java/com/github/damontecres/wholphin/services/tvprovider/TvProviderSchedulerService.kt

@@ -21,6 +21,7 @@ import timber.log.Timber
 import javax.inject.Inject
 import kotlin.time.Duration.Companion.hours
 import kotlin.time.Duration.Companion.minutes
+import kotlin.time.Duration.Companion.seconds
 import kotlin.time.toJavaDuration
 
 @ActivityScoped
@@ -60,7 +61,8 @@ class TvProviderSchedulerService
                                                 TvProviderWorker.PARAM_USER_ID to user.user.id.toString(),
                                                 TvProviderWorker.PARAM_SERVER_ID to user.server.id.toString(),
                                             ),
-                                        ).build(),
+                                        ).setInitialDelay(60.seconds.toJavaDuration())
+                                            .build(),
                                 ).await()
                         }
                     }

app/src/test/java/com/github/damontecres/wholphin/services/SuggestionServiceTest.kt

@@ -12,7 +12,6 @@ import io.mockk.every
 import io.mockk.mockk
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.ExperimentalCoroutinesApi
-import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.flow.flowOf
 import kotlinx.coroutines.test.StandardTestDispatcher
@@ -86,7 +85,6 @@ class SuggestionServiceTest {
         runTest {
             val currentUser = MutableLiveData<JellyfinUser?>(null)
             every { mockServerRepository.currentUser } returns currentUser
-            every { mockCache.cacheVersion } returns MutableStateFlow(0L)
             every { mockWorkManager.getWorkInfosForUniqueWorkFlow(any()) } returns flowOf(emptyList())
 
             val service = createService()
@@ -104,7 +102,6 @@ class SuggestionServiceTest {
                 val currentUser = MutableLiveData<JellyfinUser?>(mockUser(userId))
 
                 every { mockServerRepository.currentUser } returns currentUser
-                every { mockCache.cacheVersion } returns MutableStateFlow(0L)
                 coEvery { mockCache.get(userId, parentId, BaseItemKind.MOVIE) } returns null
                 every { mockWorkManager.getWorkInfosForUniqueWorkFlow(any()) } returns
                     flowOf(listOf(mockWorkInfo(state)))
@@ -125,7 +122,6 @@ class SuggestionServiceTest {
                 val currentUser = MutableLiveData<JellyfinUser?>(mockUser(userId))
 
                 every { mockServerRepository.currentUser } returns currentUser
-                every { mockCache.cacheVersion } returns MutableStateFlow(0L)
                 coEvery { mockCache.get(userId, parentId, BaseItemKind.MOVIE) } returns null
                 every { mockWorkManager.getWorkInfosForUniqueWorkFlow(any()) } returns
                     flowOf(listOf(mockWorkInfo(state)))
@@ -145,7 +141,6 @@ class SuggestionServiceTest {
             val currentUser = MutableLiveData<JellyfinUser?>(mockUser(userId))
 
             every { mockServerRepository.currentUser } returns currentUser
-            every { mockCache.cacheVersion } returns MutableStateFlow(0L)
             coEvery { mockCache.get(userId, parentId, BaseItemKind.MOVIE) } returns null
             every { mockWorkManager.getWorkInfosForUniqueWorkFlow(any()) } returns flowOf(emptyList())
 
@@ -164,7 +159,6 @@ class SuggestionServiceTest {
             val currentUser = MutableLiveData<JellyfinUser?>(mockUser(userId))
 
             every { mockServerRepository.currentUser } returns currentUser
-            every { mockCache.cacheVersion } returns MutableStateFlow(0L)
             every { mockWorkManager.getWorkInfosForUniqueWorkFlow(any()) } returns flowOf(emptyList())
 
             coEvery { mockCache.get(userId, libraryId, BaseItemKind.MOVIE) } returns null
@@ -199,7 +193,6 @@ class SuggestionServiceTest {
             val currentUser = MutableLiveData<JellyfinUser?>(mockUser(userId))
 
             every { mockServerRepository.currentUser } returns currentUser
-            every { mockCache.cacheVersion } returns MutableStateFlow(0L)
 
             val cachedId = UUID.randomUUID()
             coEvery {
@@ -237,7 +230,6 @@ class SuggestionServiceTest {
             val currentUser = MutableLiveData<JellyfinUser?>(mockUser(userId))
 
             every { mockServerRepository.currentUser } returns currentUser
-            every { mockCache.cacheVersion } returns MutableStateFlow(0L)
 
             val cachedId = UUID.randomUUID()
             coEvery {

app/src/test/java/com/github/damontecres/wholphin/services/SuggestionsCacheTest.kt

@@ -1,6 +1,7 @@
 package com.github.damontecres.wholphin.services
 
 import android.content.Context
+import com.mayakapps.kache.ObjectKache
 import io.mockk.every
 import io.mockk.mockk
 import kotlinx.coroutines.test.runTest
@@ -28,11 +29,11 @@ class SuggestionsCacheTest {
         return SuggestionsCache(mockContext)
     }
 
-    private fun memoryCacheOf(cache: SuggestionsCache): MutableMap<String, CachedSuggestions> {
+    private fun memoryCacheOf(cache: SuggestionsCache): ObjectKache<String, CachedSuggestions> {
         val field = SuggestionsCache::class.java.getDeclaredField("memoryCache")
         field.isAccessible = true
         @Suppress("UNCHECKED_CAST")
-        return field.get(cache) as MutableMap<String, CachedSuggestions>
+        return field.get(cache) as ObjectKache<String, CachedSuggestions>
     }
 
     @Test
@@ -57,7 +58,6 @@ class SuggestionsCacheTest {
             val libId = UUID.randomUUID()
 
             cache1.put(userId, libId, BaseItemKind.MOVIE, emptyList())
-            cache1.save()
 
             // Create a fresh instance which won't have the memory entry
             val cache2 = testCacheWithTempDir()
@@ -192,7 +192,6 @@ class SuggestionsCacheTest {
             val cache1 = testCacheWithTempDir()
             cache1.put(userId, lib1, BaseItemKind.MOVIE, ids1)
             cache1.put(userId, lib2, BaseItemKind.SERIES, ids2)
-            cache1.save()
 
             // Read with fresh cache instance (empty memory cache, reads from disk)
             val cache2 = testCacheWithTempDir()

app/src/test/java/com/github/damontecres/wholphin/services/SuggestionsSchedulerServiceTest.kt

@@ -12,7 +12,6 @@ import com.github.damontecres.wholphin.data.CurrentUser
 import com.github.damontecres.wholphin.data.ServerRepository
 import com.github.damontecres.wholphin.data.model.JellyfinServer
 import com.github.damontecres.wholphin.data.model.JellyfinUser
-import io.mockk.coEvery
 import io.mockk.every
 import io.mockk.mockk
 import io.mockk.slot
@@ -30,7 +29,6 @@ import org.junit.Before
 import org.junit.Rule
 import org.junit.Test
 import java.util.UUID
-import java.util.concurrent.TimeUnit
 
 @OptIn(ExperimentalCoroutinesApi::class)
 class SuggestionsSchedulerServiceTest {
@@ -65,7 +63,6 @@ class SuggestionsSchedulerServiceTest {
     @Test
     fun schedules_periodic_work_when_user_present() =
         runTest {
-            coEvery { mockCache.isEmpty() } returns false
             createService()
             currentLiveData.value =
                 CurrentUser(
@@ -79,7 +76,6 @@ class SuggestionsSchedulerServiceTest {
     @Test
     fun cancels_work_when_user_null() =
         runTest {
-            coEvery { mockCache.isEmpty() } returns false
             createService()
             currentLiveData.value =
                 CurrentUser(
@@ -95,7 +91,6 @@ class SuggestionsSchedulerServiceTest {
     @Test
     fun schedules_periodic_work_with_delay_when_cache_empty() =
         runTest {
-            coEvery { mockCache.isEmpty() } returns true
             val workRequestSlot = slot<PeriodicWorkRequest>()
             every {
                 mockWorkManager.enqueueUniquePeriodicWork(
@@ -114,13 +109,12 @@ class SuggestionsSchedulerServiceTest {
             advanceUntilIdle()
 
             verify { mockWorkManager.enqueueUniquePeriodicWork(SuggestionsWorker.WORK_NAME, any(), any()) }
-            assertEquals(30000L, workRequestSlot.captured.workSpec.initialDelay)
+            assertEquals(60000L, workRequestSlot.captured.workSpec.initialDelay)
         }
 
     @Test
-    fun schedules_periodic_work_without_delay_when_cache_not_empty() =
+    fun schedules_periodic_work_with_delay_when_cache_not_empty() =
         runTest {
-            coEvery { mockCache.isEmpty() } returns false
             val workRequestSlot = slot<PeriodicWorkRequest>()
             every {
                 mockWorkManager.enqueueUniquePeriodicWork(
@@ -139,6 +133,6 @@ class SuggestionsSchedulerServiceTest {
             advanceUntilIdle()
 
             verify { mockWorkManager.enqueueUniquePeriodicWork(SuggestionsWorker.WORK_NAME, any(), any()) }
-            assertEquals(0L, workRequestSlot.captured.workSpec.initialDelay)
+            assertEquals(60000L, workRequestSlot.captured.workSpec.initialDelay)
         }
 }

app/src/test/java/com/github/damontecres/wholphin/services/SuggestionsWorkerTest.kt

@@ -132,7 +132,6 @@ class SuggestionsWorkerTest {
 
                 assertEquals(ListenableWorker.Result.success(), result)
                 coVerify { mockCache.put(testUserId, viewId, itemKind, any()) }
-                coVerify { mockCache.save() }
             }
         }
 

gradle/libs.versions.toml

@@ -8,6 +8,7 @@ desugar_jdk_libs = "2.1.5"
 hiltCompiler = "1.3.0"
 hiltNavigationCompose = "1.3.0"
 hiltWork = "1.3.0"
+kache = "2.1.1"
 kotlin = "2.3.0"
 kotlinxCoroutinesCore = "1.10.2"
 ksp = "2.3.0"
@@ -80,6 +81,8 @@ auto-service-ksp = { module = "dev.zacsweers.autoservice:auto-service-ksp", vers
 desugar_jdk_libs = { module = "com.android.tools:desugar_jdk_libs", version.ref = "desugar_jdk_libs" }
 hilt-android = { module = "com.google.dagger:hilt-android", version.ref = "hilt" }
 hilt-android-compiler = { module = "com.google.dagger:hilt-android-compiler", version.ref = "hilt" }
+kache = { module = "com.mayakapps.kache:kache", version.ref = "kache" }
+kache-file = { module = "com.mayakapps.kache:file-kache", version.ref = "kache" }
 kotlinx-coroutines-core = { module = "org.jetbrains.kotlinx:kotlinx-coroutines-core", version.ref = "kotlinxCoroutinesCore" }
 mockk-agent = { module = "io.mockk:mockk-agent", version.ref = "mockk" }
 mockk-android = { module = "io.mockk:mockk-android", version.ref = "mockk" }