RUM-8038: Reset backoff to minimum on upload success

Author: jonathanmos

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

@@ -12,7 +12,6 @@ import com.datadog.android.core.internal.data.upload.DataOkHttpUploader.Companio
 import java.io.IOException
 import java.util.concurrent.ConcurrentHashMap
 import java.util.concurrent.TimeUnit
-import kotlin.math.max
 import kotlin.math.min
 import kotlin.math.roundToLong
 
@@ -32,7 +31,7 @@ internal class DefaultUploadSchedulerStrategy(
     ): Long {
         val previousDelay = currentDelays.getOrPut(featureName) { uploadConfiguration.defaultDelayMs }
         val updatedDelay = if (uploadAttempts > 0 && throwable == null && lastStatusCode == HTTP_ACCEPTED) {
-            decreaseInterval(previousDelay)
+            uploadConfiguration.minDelayMs
         } else {
             increaseInterval(previousDelay, throwable)
         }
@@ -44,12 +43,6 @@ internal class DefaultUploadSchedulerStrategy(
 
     // region Internal
 
-    private fun decreaseInterval(previousDelay: Long): Long {
-        @Suppress("UnsafeThirdPartyFunctionCall") // not a NaN
-        val newDelayMs = (previousDelay * DECREASE_PERCENT).roundToLong()
-        return max(uploadConfiguration.minDelayMs, newDelayMs)
-    }
-
     private fun increaseInterval(previousDelay: Long, throwable: Throwable?): Long {
         @Suppress("UnsafeThirdPartyFunctionCall") // not a NaN
         val newDelayMs = (previousDelay * INCREASE_PERCENT).roundToLong()
@@ -67,7 +60,6 @@ internal class DefaultUploadSchedulerStrategy(
     // endregion
 
     companion object {
-        internal const val DECREASE_PERCENT = 0.90
         internal const val INCREASE_PERCENT = 1.10
         internal val NETWORK_ERROR_DELAY_MS = TimeUnit.MINUTES.toMillis(1) // 1 minute delay
     }

dd-sdk-android-core/src/test/kotlin/com/datadog/android/core/internal/data/upload/DefaultUploadSchedulerStrategyTest.kt

@@ -26,15 +26,15 @@ import java.io.IOException
 @ForgeConfiguration(Configurator::class)
 internal class DefaultUploadSchedulerStrategyTest {
 
-    lateinit var testedStrategy: UploadSchedulerStrategy
+    private lateinit var testedStrategy: UploadSchedulerStrategy
 
     @Forgery
     lateinit var fakeConfiguration: DataUploadConfiguration
 
     @StringForgery
     lateinit var fakeFeatureName: String
 
-    var initialDelay = 0L
+    private var initialDelay = 0L
 
     @BeforeEach
     fun `set up`() {
@@ -43,7 +43,7 @@ internal class DefaultUploadSchedulerStrategyTest {
     }
 
     @Test
-    fun `M decrease delay W getMsDelayUntilNextUpload() {successful attempt}`(
+    fun `M decrease delay to minimum W getMsDelayUntilNextUpload() {successful attempt}`(
         @IntForgery(1, 128) repeats: Int,
         @IntForgery(1, 64) attempts: Int
     ) {
@@ -54,8 +54,7 @@ internal class DefaultUploadSchedulerStrategyTest {
         repeat(repeats) { delay = testedStrategy.getMsDelayUntilNextUpload(fakeFeatureName, attempts, 202, null) }
 
         // Then
-        assertThat(delay).isLessThan(initialDelay)
-        assertThat(delay).isGreaterThanOrEqualTo(fakeConfiguration.minDelayMs)
+        assertThat(delay).isEqualTo(fakeConfiguration.minDelayMs)
     }
 
     @Test