Multiplatformize concurrent API usage using Stately

gradle/libs.versions.toml

@@ -57,6 +57,7 @@ paparazziNative = "2022.1.1-canary-f5f9f71"
 skiko = "0.7.7"
 spdxGradlePlugin = "0.1.0"
 sqldelight = "1.3.0"
+stately = "2.0.0-rc3"
 retrofit = "2.7.2"
 wire = "4.7.0"
 
@@ -262,6 +263,8 @@ spdxGradlePluginz = { module = "org.spdx:spdx-gradle-plugin", version.ref = "spd
 sqldelightAndroid = { module = "com.squareup.sqldelight:android-driver", version.ref = "sqldelight" }
 sqldelightCoroutinesExt = { module = "com.squareup.sqldelight:coroutines-extensions", version.ref = "sqldelight" }
 sqliteJdbc = { module = "org.xerial:sqlite-jdbc", version = "3.36.0" }
+statelyConcurrency = { module = "co.touchlab:stately-concurrency", version.ref = "stately" }
+statelyConcurrentCollections = { module = "co.touchlab:stately-concurrent-collections", version.ref = "stately" }
 testCore = { module = "androidx.test:core", version.ref = "androidxTestCore" }
 testCoreKtx = { module = "androidx.test:core-ktx", version.ref = "androidxTestCore" }
 testExtJunit = { module = "androidx.test.ext:junit", version.ref = "androidxTestExtJunit" }

gradle/verification-keyring.keys

@@ -12159,6 +12159,42 @@ VDzc34e+Nr/b2pN05MDHA0dXmb/irwPBl0mTOgAgC805qkR14xhd1GeL6MEA34k8
 =CmMl
 -----END PGP PUBLIC KEY BLOCK-----
 
+pub    DE453E55DC86FC9B
+uid    Touchlab <build@touchlab.co>
+
+sub    A947A3FCB1697B4F
+-----BEGIN PGP PUBLIC KEY BLOCK-----
+Version: BCPG v1.68
+
+mQENBF7H/6gBCACbEuIbxWAfHEYViPqdpwxDYauxsYwk6FgA9sSO1nS95KRwx+Cs
+X6F8nRGnfLtbo6Ffcp6r58fNi9RvY7ueRGiL0kQd6c5GYx6dH1b91Q1qrdVOeEdj
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+pCin+E1orZiL52+aSNtOsmzLW7qmL2VuDmoQ5guPfX7l6fioCwnUB9VA2LhD2Bm3
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+Fcs036YLpAZEMKrhTAPTiF3MaOhjT9JcT1LSsyABi9e/r9zBQgzr718YgvMmce72
+nKt72vp1tijOHu0q3axi9I5LYt7OzBsSOmCgUndIb+JPIkd/axE77f/tznexTKEU
+Aed/xtYqAOg+fffGu9gRpkZFbFNNTH3iAvLPPg4SQAF3dQ5fSwT0NEbaXq6FT+aT
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+ClYd7CwAcljpFxHI6Rol9sRlTbDJvAX4aQvrFqhlD+i1X12O
+=FrYN
+-----END PGP PUBLIC KEY BLOCK-----
+
 pub    0729A0AFF8999A87
 sub    6005789E24E5AD1E
 sub    6A0975F8B1127B83

gradle/verification-metadata.xml

@@ -344,6 +344,7 @@
             <trusting group="io.grpc"/>
          </trusted-key>
          <trusted-key id="b252e5789636134a311e4463971b04f56669b805" group="com.google.jsilver"/>
+         <trusted-key id="b2f967b67dadc1f07172dbdade453e55dc86fc9b" group="co.touchlab"/>
          <trusted-key id="b41089a2da79b0fa5810252872385ff0af338d52" group="org.threeten"/>
          <trusted-key id="b46dc71e03feeb7f89d1f2491f7a8f87b9d8f501" group="org.jetbrains.trove4j"/>
          <trusted-key id="b47034c19c9b1f3dc3702f8d476634a4694e716a" group="com.googlecode.java-diff-utils"/>
@@ -985,6 +986,7 @@
       <component group="org.sonatype.oss" name="oss-parent" version="9">
          <artifact name="oss-parent-9.pom">
             <pgp value="44fbdbbc1a00fe414f1c1873586654072ead6677"/>
+            <sha256 value="fb40265f982548212ff82e362e59732b2187ec6f0d80182885c14ef1f982827a" origin="Generated by Gradle"/>
          </artifact>
       </component>
       <component group="org.tensorflow" name="tensorflow-lite-metadata" version="0.1.0-rc2">

paging/paging-common/build.gradle

@@ -40,6 +40,8 @@ androidXMultiplatform {
             dependencies {
                 api(libs.kotlinStdlib)
                 api(libs.kotlinCoroutinesCore)
+                implementation(libs.statelyConcurrency)
+                implementation(libs.statelyConcurrentCollections)
             }
         }
 

paging/paging-common/src/jvmMain/kotlin/androidx/paging/FlowExt.kt

@@ -22,7 +22,7 @@ import androidx.annotation.RestrictTo
 import androidx.paging.CombineSource.INITIAL
 import androidx.paging.CombineSource.OTHER
 import androidx.paging.CombineSource.RECEIVER
-import java.util.concurrent.atomic.AtomicInteger
+import co.touchlab.stately.concurrency.AtomicInt
 import kotlinx.coroutines.CompletableDeferred
 import kotlinx.coroutines.Job
 import kotlinx.coroutines.channels.SendChannel
@@ -137,7 +137,7 @@ internal suspend inline fun <T1, T2, R> Flow<T1>.combineWithoutBatching(
     crossinline transform: suspend (T1, T2, updateFrom: CombineSource) -> R,
 ): Flow<R> {
     return simpleChannelFlow {
-        val incompleteFlows = AtomicInteger(2)
+        val incompleteFlows = AtomicInt(2)
         val unbatchedFlowCombiner = UnbatchedFlowCombiner<T1, T2> { t1, t2, updateFrom ->
             send(transform(t1, t2, updateFrom))
         }

paging/paging-common/src/jvmMain/kotlin/androidx/paging/HintHandler.kt

@@ -21,7 +21,7 @@ package androidx.paging
 import androidx.annotation.RestrictTo
 import androidx.paging.LoadType.APPEND
 import androidx.paging.LoadType.PREPEND
-import java.util.concurrent.locks.ReentrantLock
+import co.touchlab.stately.concurrency.Lock
 import kotlin.concurrent.withLock
 import kotlinx.coroutines.channels.BufferOverflow
 import kotlinx.coroutines.flow.Flow
@@ -106,7 +106,7 @@ internal class HintHandler {
             get() = prepend.flow
         val appendFlow
             get() = append.flow
-        private val lock = ReentrantLock()
+        private val lock = Lock()
 
         /**
          * Modifies the state inside a lock where it gets access to the mutable values.

paging/paging-common/src/jvmMain/kotlin/androidx/paging/InvalidateCallbackTracker.kt

@@ -17,7 +17,7 @@
 package androidx.paging
 
 import androidx.annotation.VisibleForTesting
-import java.util.concurrent.locks.ReentrantLock
+import co.touchlab.stately.concurrency.Lock
 import kotlin.concurrent.withLock
 
 /**
@@ -30,7 +30,7 @@ internal class InvalidateCallbackTracker<T>(
      */
     private val invalidGetter: (() -> Boolean)? = null,
 ) {
-    private val lock = ReentrantLock()
+    private val lock = Lock()
     private val callbacks = mutableListOf<T>()
     internal var invalid = false
         private set

paging/paging-common/src/jvmMain/kotlin/androidx/paging/InvalidatingPagingSourceFactory.kt

@@ -17,15 +17,15 @@
 package androidx.paging
 
 import androidx.annotation.VisibleForTesting
-import java.util.concurrent.CopyOnWriteArrayList
+import co.touchlab.stately.collections.ConcurrentMutableList
 
 /**
  * Wrapper class for a [PagingSource] factory intended for usage in [Pager] construction.
  *
  * Calling [invalidate] on this [InvalidatingPagingSourceFactory] will forward invalidate signals
  * to all active [PagingSource]s that were produced by calling [invoke].
  *
- * This class is backed by a [CopyOnWriteArrayList], which is thread-safe for concurrent calls to
+ * This class is backed by a [ConcurrentMutableList], which is thread-safe for concurrent calls to
  * any mutative operations including both [invoke] and [invalidate].
  *
  * @param pagingSourceFactory The [PagingSource] factory that returns a PagingSource when called
@@ -35,7 +35,7 @@ public class InvalidatingPagingSourceFactory<Key : Any, Value : Any>(
 ) : PagingSourceFactory<Key, Value> {
 
     @VisibleForTesting
-    internal val pagingSources = CopyOnWriteArrayList<PagingSource<Key, Value>>()
+    internal val pagingSources = ConcurrentMutableList<PagingSource<Key, Value>>()
 
     /**
      * @return [PagingSource] which will be invalidated when this factory's [invalidate] method
@@ -50,11 +50,9 @@ public class InvalidatingPagingSourceFactory<Key : Any, Value : Any>(
      * [InvalidatingPagingSourceFactory]
      */
     public fun invalidate() {
-        for (pagingSource in pagingSources) {
-            if (!pagingSource.invalid) {
-                pagingSource.invalidate()
-            }
-        }
+        pagingSources
+            .filterNot { it.invalid }
+            .forEach { it.invalidate() }
 
         pagingSources.removeAll { it.invalid }
     }

paging/paging-common/src/jvmMain/kotlin/androidx/paging/LegacyPageFetcher.kt

@@ -19,7 +19,7 @@ package androidx.paging
 import androidx.paging.LoadState.Loading
 import androidx.paging.LoadState.NotLoading
 import androidx.paging.PagingSource.LoadParams
-import java.util.concurrent.atomic.AtomicBoolean
+import co.touchlab.stately.concurrency.AtomicBoolean
 import kotlinx.coroutines.CoroutineDispatcher
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.launch
@@ -45,7 +45,7 @@ internal class LegacyPageFetcher<K : Any, V : Any>(
     }
 
     val isDetached
-        get() = detached.get()
+        get() = detached.value
 
     private fun scheduleLoad(type: LoadType, params: LoadParams<K>) {
         // Listen on the BG thread if the paged source is invalid, since it can be expensive.
@@ -154,7 +154,9 @@ internal class LegacyPageFetcher<K : Any, V : Any>(
         }
     }
 
-    fun detach() = detached.set(true)
+    fun detach() {
+        detached.value = true
+    }
 
     internal interface PageConsumer<V : Any> {
         /**

paging/paging-common/src/jvmMain/kotlin/androidx/paging/MutableCombinedLoadStateCollection.kt

@@ -19,7 +19,7 @@ package androidx.paging
 import androidx.paging.LoadState.Error
 import androidx.paging.LoadState.Loading
 import androidx.paging.LoadState.NotLoading
-import java.util.concurrent.CopyOnWriteArrayList
+import co.touchlab.stately.collections.ConcurrentMutableList
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.asStateFlow
@@ -35,7 +35,7 @@ import kotlinx.coroutines.flow.update
  */
 internal class MutableCombinedLoadStateCollection {
 
-    private val listeners = CopyOnWriteArrayList<(CombinedLoadStates) -> Unit>()
+    private val listeners = ConcurrentMutableList<(CombinedLoadStates) -> Unit>()
     private val _stateFlow = MutableStateFlow<CombinedLoadStates?>(null)
     public val stateFlow = _stateFlow.asStateFlow()
 

paging/paging-common/src/jvmMain/kotlin/androidx/paging/PageFetcherSnapshot.kt

@@ -31,7 +31,7 @@ import androidx.paging.PagingSource.LoadParams
 import androidx.paging.PagingSource.LoadResult
 import androidx.paging.PagingSource.LoadResult.Page
 import androidx.paging.PagingSource.LoadResult.Page.Companion.COUNT_UNDEFINED
-import java.util.concurrent.atomic.AtomicBoolean
+import co.touchlab.stately.concurrency.AtomicBoolean
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Job
 import kotlinx.coroutines.channels.Channel

paging/paging-common/src/jvmMain/kotlin/androidx/paging/PagingDataDiffer.kt

@@ -28,7 +28,7 @@ import androidx.paging.PageEvent.StaticList
 import androidx.paging.PagePresenter.ProcessPageEventCallback
 import androidx.paging.internal.BUGANIZER_URL
 import androidx.paging.internal.appendMediatorStatesIfNotNull
-import java.util.concurrent.CopyOnWriteArrayList
+import co.touchlab.stately.collections.ConcurrentMutableList
 import kotlin.coroutines.CoroutineContext
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.channels.BufferOverflow.DROP_OLDEST
@@ -52,7 +52,7 @@ public abstract class PagingDataDiffer<T : Any>(
     private val combinedLoadStatesCollection = MutableCombinedLoadStateCollection().apply {
         cachedPagingData?.cachedEvent()?.let { set(it.sourceLoadStates, it.mediatorLoadStates) }
     }
-    private val onPagesUpdatedListeners = CopyOnWriteArrayList<() -> Unit>()
+    private val onPagesUpdatedListeners = ConcurrentMutableList<() -> Unit>()
 
     private val collectFromRunner = SingleRunner()
 

paging/paging-common/src/jvmMain/kotlin/androidx/paging/RemoteMediatorAccessor.kt

@@ -20,7 +20,7 @@ import androidx.paging.AccessorState.BlockState.COMPLETED
 import androidx.paging.AccessorState.BlockState.REQUIRES_REFRESH
 import androidx.paging.AccessorState.BlockState.UNBLOCKED
 import androidx.paging.RemoteMediator.MediatorResult
-import java.util.concurrent.locks.ReentrantLock
+import co.touchlab.stately.concurrency.Lock
 import kotlin.concurrent.withLock
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.flow.MutableStateFlow
@@ -67,7 +67,7 @@ internal fun <Key : Any, Value : Any> RemoteMediatorAccessor(
  * Simple wrapper around the local state of accessor to ensure we don't concurrently change it.
  */
 private class AccessorStateHolder<Key : Any, Value : Any> {
-    private val lock = ReentrantLock()
+    private val lock = Lock()
 
     private val _loadStates = MutableStateFlow(LoadStates.IDLE)
     val loadStates

paging/paging-common/src/jvmTest/kotlin/androidx/paging/CachingTest.kt

@@ -19,7 +19,7 @@ import androidx.kruth.assertThat
 import androidx.paging.ActiveFlowTracker.FlowType
 import androidx.paging.ActiveFlowTracker.FlowType.PAGED_DATA_FLOW
 import androidx.paging.ActiveFlowTracker.FlowType.PAGE_EVENT_FLOW
-import java.util.concurrent.atomic.AtomicInteger
+import co.touchlab.stately.concurrency.AtomicInt
 import kotlin.test.Test
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
@@ -802,8 +802,8 @@ class CachingTest {
 
     private class ActiveFlowTrackerImpl : ActiveFlowTracker {
         private val counters = mapOf(
-            PAGED_DATA_FLOW to AtomicInteger(0),
-            PAGE_EVENT_FLOW to AtomicInteger(0)
+            PAGED_DATA_FLOW to AtomicInt(0),
+            PAGE_EVENT_FLOW to AtomicInt(0)
         )
 
         override fun onNewCachedEventFlow(cachedPageEventFlow: CachedPageEventFlow<*>) {

paging/paging-common/src/jvmTest/kotlin/androidx/paging/GarbageCollectionTestHelper.kt

@@ -17,9 +17,9 @@
 package androidx.paging
 
 import androidx.kruth.assertWithMessage
+import co.touchlab.stately.concurrency.AtomicBoolean
 import java.lang.ref.ReferenceQueue
 import java.lang.ref.WeakReference
-import java.util.concurrent.atomic.AtomicBoolean
 import kotlin.concurrent.thread
 import kotlin.random.Random
 import kotlin.reflect.KClass
@@ -45,7 +45,7 @@ internal class GarbageCollectionTestHelper {
                 val arraySize = Random.nextInt(1000)
                 leak.add(ByteArray(arraySize))
                 System.gc()
-            } while (continueTriggeringGc.get())
+            } while (continueTriggeringGc.value)
         }
         var collectedItemCount = 0
         val expectedItemCount = size - expected.sumOf { it.second }
@@ -54,7 +54,7 @@ internal class GarbageCollectionTestHelper {
         ) {
             collectedItemCount++
         }
-        continueTriggeringGc.set(false)
+        continueTriggeringGc.value = false
         val leakedObjects = countLiveObjects()
         val leakedObjectToStrings = references.mapNotNull {
             it.get()

paging/paging-common/src/jvmTest/kotlin/androidx/paging/RemoteMediatorAccessorTest.kt

@@ -25,7 +25,7 @@ import androidx.paging.RemoteMediator.InitializeAction.LAUNCH_INITIAL_REFRESH
 import androidx.paging.RemoteMediator.InitializeAction.SKIP_INITIAL_REFRESH
 import androidx.paging.RemoteMediatorMock.LoadEvent
 import androidx.paging.TestPagingSource.Companion.LOAD_ERROR
-import java.util.concurrent.atomic.AtomicBoolean
+import co.touchlab.stately.concurrency.AtomicBoolean
 import kotlin.test.Test
 import kotlin.test.assertEquals
 import kotlin.test.fail
@@ -500,7 +500,7 @@ class RemoteMediatorAccessorTest {
                 return try {
                     super.load(loadType, state)
                 } finally {
-                    loading.set(false)
+                    loading.value = false
                 }
             }
         }
@@ -583,7 +583,7 @@ class RemoteMediatorAccessorTest {
                 return try {
                     super.load(loadType, state)
                 } finally {
-                    loading.set(false)
+                    loading.value = false
                 }
             }
         }