Implement /sdk/v2/flags API call and LoadStoreCache for flag configurations

build.gradle

@@ -5,7 +5,7 @@ apply plugin: 'org.jetbrains.dokka'
 apply plugin: 'org.jlleitschuh.gradle.ktlint'
 
 buildscript {
-    ext.kotlin_version = '1.5.31'
+    ext.kotlin_version = '1.6.21'
     ext.dokka_version = '1.4.32'
 
     repositories {

sdk/build.gradle

@@ -2,8 +2,8 @@ plugins {
     id 'com.android.library'
     id 'kotlin-android'
     id 'org.jetbrains.dokka'
+    id 'org.jetbrains.kotlin.plugin.serialization' version '1.6.0'
 }
-
 ext {
     PUBLISH_NAME = 'Experiment Android SDK'
     PUBLISH_DESCRIPTION = 'Amplitude Experiment client-side SDK for Android'
@@ -42,6 +42,8 @@ dependencies {
     implementation 'com.amplitude:analytics-connector:1.0.0'
     implementation 'com.squareup.okhttp3:okhttp:4.9.1'
     implementation 'com.amplitude:android-sdk:2.26.1'
+    implementation("org.jetbrains.kotlinx:kotlinx-serialization-core:1.3.3")
+    implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.3.3")
 
     testImplementation 'junit:junit:4.13.2'
     testImplementation 'org.json:json:20201115'

sdk/src/main/java/com/amplitude/evaluation-core/EvaluationAllocation.kt

@@ -0,0 +1,9 @@
+package com.amplitude.experiment.evaluation
+
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class EvaluationAllocation(
+    val range: List<Int>,
+    val distributions: List<EvaluationDistribution>,
+)

sdk/src/main/java/com/amplitude/evaluation-core/EvaluationBucket.kt

@@ -0,0 +1,16 @@
+package com.amplitude.experiment.evaluation
+
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class EvaluationBucket(
+    // How to select the prop from the context.
+    val selector: List<String>,
+
+    // A random string used to salt the bucketing value prior to hashing.
+    val salt: String,
+
+    // Determines which variant, if any, should be returned based on the
+    // result of the hash functions.
+    val allocations: List<EvaluationAllocation>,
+)

sdk/src/main/java/com/amplitude/evaluation-core/EvaluationCondition.kt

@@ -0,0 +1,15 @@
+package com.amplitude.experiment.evaluation
+
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class EvaluationCondition(
+    // How to select the property from the evaluation state.
+    val selector: List<String>,
+
+    // The operator.
+    val op: String,
+
+    // The values to compare to.
+    val values: Set<String>
+)

sdk/src/main/java/com/amplitude/evaluation-core/EvaluationContext.kt

@@ -0,0 +1,9 @@
+package com.amplitude.experiment.evaluation
+
+import kotlinx.serialization.Serializable
+
+@Serializable
+class EvaluationContext : MutableMap<String, Any?> by LinkedHashMap(), Selectable {
+
+    override fun select(selector: String): Any? = this[selector]
+}

sdk/src/main/java/com/amplitude/evaluation-core/EvaluationDistribution.kt

@@ -0,0 +1,13 @@
+package com.amplitude.experiment.evaluation
+
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class EvaluationDistribution(
+    // The key of the variant to deliver if this range matches.
+    val variant: String,
+
+    // The distribution range [start, end), where the max value is 42949672.
+    // E.g. [0, 42949673] = [0%, 100%]
+    val range: List<Int>,
+)