[Improvement] make part of operationrepo initialization async

OneSignalSDK/onesignal/core/src/main/java/com/onesignal/common/modeling/ModelStore.kt

@@ -154,31 +154,35 @@ abstract class ModelStore<TModel>(
     }
 
     protected fun load() {
+        if (name == null || _prefs == null) {
+            return
+        }
+
+        val str = _prefs.getString(PreferenceStores.ONESIGNAL, PreferenceOneSignalKeys.MODEL_STORE_PREFIX + name, "[]")
+        val jsonArray = JSONArray(str)
         synchronized(models) {
-            if (name != null && _prefs != null) {
-                val str = _prefs.getString(PreferenceStores.ONESIGNAL, PreferenceOneSignalKeys.MODEL_STORE_PREFIX + name, "[]")
-                val jsonArray = JSONArray(str)
-                for (index in 0 until jsonArray.length()) {
-                    val newModel = create(jsonArray.getJSONObject(index)) ?: continue
-                    models.add(newModel)
-                    // listen for changes to this model
-                    newModel.subscribe(this)
-                }
+            for (index in 0 until jsonArray.length()) {
+                val newModel = create(jsonArray.getJSONObject(index)) ?: continue
+                models.add(newModel)
+                // listen for changes to this model
+                newModel.subscribe(this)
             }
         }
     }
 
     fun persist() {
-        synchronized(models) {
-            if (name != null && _prefs != null) {
-                val jsonArray = JSONArray()
-                for (model in models) {
-                    jsonArray.put(model.toJSON())
-                }
+        if (name == null || _prefs == null) {
+            return
+        }
 
-                _prefs.saveString(PreferenceStores.ONESIGNAL, PreferenceOneSignalKeys.MODEL_STORE_PREFIX + name, jsonArray.toString())
+        val jsonArray = JSONArray()
+        synchronized(models) {
+            for (model in models) {
+                jsonArray.put(model.toJSON())
             }
         }
+
+        _prefs.saveString(PreferenceStores.ONESIGNAL, PreferenceOneSignalKeys.MODEL_STORE_PREFIX + name, jsonArray.toString())
     }
 
     override fun subscribe(handler: IModelStoreChangeHandler<TModel>) = changeSubscription.subscribe(handler)

OneSignalSDK/onesignal/core/src/main/java/com/onesignal/core/internal/operations/impl/OperationModelStore.kt

@@ -28,7 +28,7 @@ import com.onesignal.user.internal.operations.impl.executors.UpdateUserOperation
 import org.json.JSONObject
 
 internal class OperationModelStore(prefs: IPreferencesService) : ModelStore<Operation>("operations", prefs) {
-    init {
+    fun loadOperations() {
         load()
     }
 

OneSignalSDK/onesignal/core/src/main/java/com/onesignal/core/internal/operations/impl/OperationRepo.kt

@@ -77,10 +77,6 @@ internal class OperationRepo(
             }
         }
         this.executorsMap = executorsMap
-
-        for (operation in _operationModelStore.list()) {
-            internalEnqueue(OperationQueueItem(operation, bucket = enqueueIntoBucket), flush = false, addToStore = false)
-        }
     }
 
     override fun <T : Operation> containsInstanceOf(type: KClass<T>): Boolean {
@@ -91,7 +87,11 @@ internal class OperationRepo(
 
     override fun start() {
         paused = false
-        coroutineScope.launch { processQueueForever() }
+        coroutineScope.launch {
+            // load saved operations first then start processing the queue to ensure correct operation order
+            loadSavedOperations()
+            processQueueForever()
+        }
     }
 
     override fun enqueue(
@@ -121,13 +121,18 @@ internal class OperationRepo(
         queueItem: OperationQueueItem,
         flush: Boolean,
         addToStore: Boolean,
+        index: Int? = null,
     ) {
         synchronized(queue) {
-            queue.add(queueItem)
-            if (addToStore) {
-                _operationModelStore.add(queueItem.operation)
+            if (index != null) {
+                queue.add(index, queueItem)
+            } else {
+                queue.add(queueItem)
             }
         }
+        if (addToStore) {
+            _operationModelStore.add(queueItem.operation)
+        }
 
         waiter.wake(LoopWaiterMessage(flush, 0))
     }
@@ -332,12 +337,20 @@ internal class OperationRepo(
         }
 
         val startingKey =
-            if (startingOp.operation.groupComparisonType == GroupComparisonType.CREATE) startingOp.operation.createComparisonKey else startingOp.operation.modifyComparisonKey
+            if (startingOp.operation.groupComparisonType == GroupComparisonType.CREATE) {
+                startingOp.operation.createComparisonKey
+            } else {
+                startingOp.operation.modifyComparisonKey
+            }
 
         if (queue.isNotEmpty()) {
             for (item in queue.toList()) {
                 val itemKey =
-                    if (startingOp.operation.groupComparisonType == GroupComparisonType.CREATE) item.operation.createComparisonKey else item.operation.modifyComparisonKey
+                    if (startingOp.operation.groupComparisonType == GroupComparisonType.CREATE) {
+                        item.operation.createComparisonKey
+                    } else {
+                        item.operation.modifyComparisonKey
+                    }
 
                 if (itemKey == "" && startingKey == "") {
                     throw Exception("Both comparison keys can not be blank!")
@@ -352,4 +365,21 @@ internal class OperationRepo(
 
         return ops
     }
+
+    /**
+     * Load saved operations from preference service and add them into the queue
+     * NOTE: Sometimes the loading might take longer than expected due to I/O reads from disk
+     *      Any I/O implies executing time will vary greatly.
+     */
+    private fun loadSavedOperations() {
+        _operationModelStore.loadOperations()
+        for (operation in _operationModelStore.list().withIndex()) {
+            internalEnqueue(
+                OperationQueueItem(operation.value, bucket = enqueueIntoBucket),
+                flush = false,
+                addToStore = false,
+                operation.index,
+            )
+        }
+    }
 }

OneSignalSDK/onesignal/core/src/test/java/com/onesignal/core/internal/operations/OperationRepoTests.kt

@@ -35,6 +35,7 @@ private class Mocks {
     val operationModelStore: OperationModelStore =
         run {
             val mockOperationModelStore = mockk<OperationModelStore>()
+            every { mockOperationModelStore.loadOperations() } just runs
             every { mockOperationModelStore.list() } returns listOf()
             every { mockOperationModelStore.add(any()) } just runs
             every { mockOperationModelStore.remove(any()) } just runs