RUM-5977 create UploadSchedulerStrategy interface and default implementation

dd-sdk-android-core/api/apiSurface

@@ -224,6 +224,8 @@ enum com.datadog.android.core.configuration.UploadFrequency
   - FREQUENT
   - AVERAGE
   - RARE
+interface com.datadog.android.core.configuration.UploadSchedulerStrategy
+  fun getMsDelayUntilNextUpload(String, Int, Int?, Throwable?): Long
 interface com.datadog.android.core.constraints.DataConstraints
   fun <T: Any?> validateAttributes(Map<String, T>, String? = null, String? = null, Set<String> = emptySet()): MutableMap<String, T>
   fun validateTags(List<String>): List<String>

dd-sdk-android-core/api/dd-sdk-android-core.api

@@ -608,6 +608,10 @@ public final class com/datadog/android/core/configuration/UploadFrequency : java
 	public static fun values ()[Lcom/datadog/android/core/configuration/UploadFrequency;
 }
 
+public abstract interface class com/datadog/android/core/configuration/UploadSchedulerStrategy {
+	public abstract fun getMsDelayUntilNextUpload (Ljava/lang/String;ILjava/lang/Integer;Ljava/lang/Throwable;)J
+}
+
 public abstract interface class com/datadog/android/core/constraints/DataConstraints {
 	public abstract fun validateAttributes (Ljava/util/Map;Ljava/lang/String;Ljava/lang/String;Ljava/util/Set;)Ljava/util/Map;
 	public abstract fun validateTags (Ljava/util/List;)Ljava/util/List;

dd-sdk-android-core/src/main/kotlin/com/datadog/android/core/configuration/UploadSchedulerStrategy.kt

@@ -0,0 +1,34 @@
+/*
+ * Unless explicitly stated otherwise all files in this repository are licensed under the Apache License Version 2.0.
+ * This product includes software developed at Datadog (https://www.datadoghq.com/).
+ * Copyright 2016-Present Datadog, Inc.
+ */
+
+package com.datadog.android.core.configuration
+
+import com.datadog.android.api.feature.Feature
+
+/**
+ * Defines the strategy used to schedule the waiting period between batch uploads.
+ */
+interface UploadSchedulerStrategy {
+
+    /**
+     * Should return the delay in milliseconds to wait until the next upload attempt
+     * is performed.
+     * @param featureName the name of the feature for which a new upload will be scheduled. Known feature names are
+     * listed in the [Feature.Companion] object.
+     * @param uploadAttempts the number of requests that were attempted during the last upload batch. Will be zero if
+     * the device is not ready (e.g.: when offline or with low battery) or no data is ready to be sent.
+     * If multiple batches can be uploaded, the attempts will stop at the first failure.
+     * @param lastStatusCode the HTTP status code of the last request (if available). A successful upload will have a
+     * status code 202 (Accepted). When null, it means that the network request didn't fully complete.
+     * @param throwable the exception thrown during the upload process (if any).
+     */
+    fun getMsDelayUntilNextUpload(
+        featureName: String,
+        uploadAttempts: Int,
+        lastStatusCode: Int?,
+        throwable: Throwable?
+    ): Long
+}

dd-sdk-android-core/src/main/kotlin/com/datadog/android/core/internal/SdkFeature.kt

@@ -21,11 +21,13 @@ import com.datadog.android.api.net.RequestFactory
 import com.datadog.android.api.storage.EventBatchWriter
 import com.datadog.android.api.storage.FeatureStorageConfiguration
 import com.datadog.android.api.storage.datastore.DataStoreHandler
+import com.datadog.android.core.configuration.UploadSchedulerStrategy
 import com.datadog.android.core.internal.configuration.DataUploadConfiguration
 import com.datadog.android.core.internal.data.upload.DataFlusher
 import com.datadog.android.core.internal.data.upload.DataOkHttpUploader
 import com.datadog.android.core.internal.data.upload.DataUploadScheduler
 import com.datadog.android.core.internal.data.upload.DataUploader
+import com.datadog.android.core.internal.data.upload.DefaultUploadSchedulerStrategy
 import com.datadog.android.core.internal.data.upload.NoOpDataUploader
 import com.datadog.android.core.internal.data.upload.NoOpUploadScheduler
 import com.datadog.android.core.internal.data.upload.UploadScheduler
@@ -88,27 +90,28 @@ internal class SdkFeature(
             return
         }
 
-        var dataUploadConfiguration: DataUploadConfiguration? = null
         if (wrappedFeature is StorageBackedFeature) {
             val uploadFrequency = coreFeature.uploadFrequency
             val batchProcessingLevel = coreFeature.batchProcessingLevel
-            dataUploadConfiguration = DataUploadConfiguration(
+
+            val dataUploadConfiguration = DataUploadConfiguration(
                 uploadFrequency,
                 batchProcessingLevel.maxBatchesPerUploadJob
             )
+            val uploadSchedulerStrategy = DefaultUploadSchedulerStrategy(dataUploadConfiguration)
             storage = prepareStorage(
                 dataUploadConfiguration,
                 wrappedFeature,
                 context,
                 instanceId,
                 coreFeature.persistenceStrategyFactory
             )
-        }
 
-        wrappedFeature.onInitialize(context)
+            wrappedFeature.onInitialize(context)
 
-        if (wrappedFeature is StorageBackedFeature && dataUploadConfiguration != null) {
-            setupUploader(wrappedFeature, dataUploadConfiguration)
+            setupUploader(wrappedFeature, uploadSchedulerStrategy, dataUploadConfiguration.maxBatchesPerUploadJob)
+        } else {
+            wrappedFeature.onInitialize(context)
         }
 
         if (wrappedFeature is TrackingConsentProviderCallback) {
@@ -229,7 +232,7 @@ internal class SdkFeature(
     // region Internal
 
     private fun setupMetricsDispatcher(
-        dataUploadConfiguration: DataUploadConfiguration,
+        dataUploadConfiguration: DataUploadConfiguration?,
         filePersistenceConfig: FilePersistenceConfig,
         context: Context
     ) {
@@ -251,7 +254,8 @@ internal class SdkFeature(
 
     private fun setupUploader(
         feature: StorageBackedFeature,
-        uploadConfiguration: DataUploadConfiguration
+        uploadSchedulerStrategy: UploadSchedulerStrategy,
+        maxBatchesPerJob: Int
     ) {
         uploadScheduler = if (coreFeature.isMainProcess) {
             uploader = createUploader(feature.requestFactory)
@@ -262,7 +266,8 @@ internal class SdkFeature(
                 coreFeature.contextProvider,
                 coreFeature.networkInfoProvider,
                 coreFeature.systemInfoProvider,
-                uploadConfiguration,
+                uploadSchedulerStrategy,
+                maxBatchesPerJob,
                 coreFeature.uploadExecutorService,
                 internalLogger
             )
@@ -274,7 +279,7 @@ internal class SdkFeature(
     // region Feature setup
 
     private fun prepareStorage(
-        dataUploadConfiguration: DataUploadConfiguration,
+        dataUploadConfiguration: DataUploadConfiguration?,
         wrappedFeature: StorageBackedFeature,
         context: Context,
         instanceId: String,

dd-sdk-android-core/src/main/kotlin/com/datadog/android/core/internal/data/upload/DataUploadRunnable.kt

@@ -11,8 +11,8 @@ import com.datadog.android.api.InternalLogger
 import com.datadog.android.api.context.DatadogContext
 import com.datadog.android.api.context.NetworkInfo
 import com.datadog.android.api.storage.RawBatchEvent
+import com.datadog.android.core.configuration.UploadSchedulerStrategy
 import com.datadog.android.core.internal.ContextProvider
-import com.datadog.android.core.internal.configuration.DataUploadConfiguration
 import com.datadog.android.core.internal.metrics.RemovalReason
 import com.datadog.android.core.internal.net.info.NetworkInfoProvider
 import com.datadog.android.core.internal.persistence.BatchId
@@ -21,9 +21,6 @@ import com.datadog.android.core.internal.system.SystemInfoProvider
 import com.datadog.android.core.internal.utils.scheduleSafe
 import java.util.concurrent.ScheduledThreadPoolExecutor
 import java.util.concurrent.TimeUnit
-import kotlin.math.max
-import kotlin.math.min
-import kotlin.math.roundToLong
 
 internal class DataUploadRunnable(
     private val featureName: String,
@@ -33,53 +30,44 @@ internal class DataUploadRunnable(
     private val contextProvider: ContextProvider,
     private val networkInfoProvider: NetworkInfoProvider,
     private val systemInfoProvider: SystemInfoProvider,
-    uploadConfiguration: DataUploadConfiguration,
+    internal val uploadSchedulerStrategy: UploadSchedulerStrategy,
+    internal val maxBatchesPerJob: Int,
     private val internalLogger: InternalLogger
 ) : UploadRunnable {
 
-    internal var currentDelayIntervalMs = uploadConfiguration.defaultDelayMs
-    internal val minDelayMs = uploadConfiguration.minDelayMs
-    internal val maxDelayMs = uploadConfiguration.maxDelayMs
-    internal val maxBatchesPerJob = uploadConfiguration.maxBatchesPerUploadJob
-
     //  region Runnable
 
     @WorkerThread
     override fun run() {
+        var uploadAttempts = 0
+        var lastBatchUploadStatus: UploadStatus? = null
         if (isNetworkAvailable() && isSystemReady()) {
             val context = contextProvider.context
             var batchConsumerAvailableAttempts = maxBatchesPerJob
-            var lastBatchUploadStatus: UploadStatus?
             do {
                 batchConsumerAvailableAttempts--
                 lastBatchUploadStatus = handleNextBatch(context)
-            } while (batchConsumerAvailableAttempts > 0 &&
-                lastBatchUploadStatus is UploadStatus.Success
+                if (lastBatchUploadStatus != null) {
+                    uploadAttempts++
+                }
+            } while (
+                batchConsumerAvailableAttempts > 0 && lastBatchUploadStatus is UploadStatus.Success
             )
-            if (lastBatchUploadStatus != null) {
-                handleBatchConsumingJobFrequency(lastBatchUploadStatus)
-            } else {
-                // there was no batch left or there was a problem reading the next batch
-                // in the storage so we increase the interval
-                increaseInterval(lastBatchUploadStatus)
-            }
         }
 
-        scheduleNextUpload()
+        val delayMs = uploadSchedulerStrategy.getMsDelayUntilNextUpload(
+            featureName,
+            uploadAttempts,
+            lastBatchUploadStatus?.code,
+            lastBatchUploadStatus?.throwable
+        )
+        scheduleNextUpload(delayMs)
     }
 
     // endregion
 
     // region Internal
 
-    private fun handleBatchConsumingJobFrequency(lastBatchUploadStatus: UploadStatus) {
-        if (lastBatchUploadStatus.shouldRetry) {
-            increaseInterval(lastBatchUploadStatus)
-        } else {
-            decreaseInterval()
-        }
-    }
-
     @WorkerThread
     @Suppress("UnsafeThirdPartyFunctionCall") // called inside a dedicated executor
     private fun handleNextBatch(context: DatadogContext): UploadStatus? {
@@ -109,11 +97,11 @@ internal class DataUploadRunnable(
         return hasEnoughPower && !systemInfo.powerSaveMode
     }
 
-    private fun scheduleNextUpload() {
+    private fun scheduleNextUpload(delayMs: Long) {
         threadPoolExecutor.remove(this)
         threadPoolExecutor.scheduleSafe(
             "$featureName: data upload",
-            currentDelayIntervalMs,
+            delayMs,
             TimeUnit.MILLISECONDS,
             internalLogger,
             this
@@ -137,37 +125,9 @@ internal class DataUploadRunnable(
         return status
     }
 
-    @Suppress("UnsafeThirdPartyFunctionCall") // rounded Double isn't NaN
-    private fun decreaseInterval() {
-        currentDelayIntervalMs = max(
-            minDelayMs,
-            @Suppress("UnsafeThirdPartyFunctionCall") // not a NaN
-            (currentDelayIntervalMs * DECREASE_PERCENT).roundToLong()
-        )
-    }
-
-    @Suppress("UnsafeThirdPartyFunctionCall") // rounded Double isn't NaN
-    private fun increaseInterval(status: UploadStatus?) {
-        currentDelayIntervalMs = if (status is UploadStatus.DNSError) {
-            // A DNS error will likely not be a fluke, so we use a longer delay to avoid infinite looping
-            // and prevent battery draining
-            maxDelayMs * DNS_DELAY_MULTIPLIER
-        } else {
-            min(
-                maxDelayMs,
-                @Suppress("UnsafeThirdPartyFunctionCall") // not a NaN
-                (currentDelayIntervalMs * INCREASE_PERCENT).roundToLong()
-            )
-        }
-    }
-
     // endregion
 
     companion object {
         internal const val LOW_BATTERY_THRESHOLD = 10
-        const val DECREASE_PERCENT = 0.90
-        const val INCREASE_PERCENT = 1.10
-
-        internal const val DNS_DELAY_MULTIPLIER = 100
     }
 }

dd-sdk-android-core/src/main/kotlin/com/datadog/android/core/internal/data/upload/DataUploadScheduler.kt

@@ -7,8 +7,8 @@
 package com.datadog.android.core.internal.data.upload
 
 import com.datadog.android.api.InternalLogger
+import com.datadog.android.core.configuration.UploadSchedulerStrategy
 import com.datadog.android.core.internal.ContextProvider
-import com.datadog.android.core.internal.configuration.DataUploadConfiguration
 import com.datadog.android.core.internal.net.info.NetworkInfoProvider
 import com.datadog.android.core.internal.persistence.Storage
 import com.datadog.android.core.internal.system.SystemInfoProvider
@@ -22,20 +22,22 @@ internal class DataUploadScheduler(
     contextProvider: ContextProvider,
     networkInfoProvider: NetworkInfoProvider,
     systemInfoProvider: SystemInfoProvider,
-    uploadConfiguration: DataUploadConfiguration,
+    uploadSchedulerStrategy: UploadSchedulerStrategy,
+    maxBatchesPerJob: Int,
     private val scheduledThreadPoolExecutor: ScheduledThreadPoolExecutor,
     private val internalLogger: InternalLogger
 ) : UploadScheduler {
 
     internal val runnable = DataUploadRunnable(
-        featureName,
-        scheduledThreadPoolExecutor,
-        storage,
-        dataUploader,
-        contextProvider,
-        networkInfoProvider,
-        systemInfoProvider,
-        uploadConfiguration,
+        featureName = featureName,
+        threadPoolExecutor = scheduledThreadPoolExecutor,
+        storage = storage,
+        dataUploader = dataUploader,
+        contextProvider = contextProvider,
+        networkInfoProvider = networkInfoProvider,
+        systemInfoProvider = systemInfoProvider,
+        uploadSchedulerStrategy = uploadSchedulerStrategy,
+        maxBatchesPerJob = maxBatchesPerJob,
         internalLogger = internalLogger
     )