Task/reduce min sdk to21 (#9)

* Removed all java.time usage

* fix: Update readme to point out that we've reverted to milliseconds for all durations

* Added a couple of more tests of the builders

* chore: also add a test that checks that we can configure http client with cache

* fix: add readme note about minimum sdk level

README.md

@@ -11,32 +11,8 @@ You will require the SDK on your classpath, so go ahead and add it to your gradl
 implementation("io.getunleash:unleash-android-proxy-sdk:${unleash.sdk.version}")
 ```
 
-### Add support for minSdk < 24
-
-```kotlin
-android {
-    defaultConfig {
-        // Required when setting minSdkVersion to 20 or lower
-        multiDexEnabled = true
-    }
-
-    compileOptions {
-        // Flag to enable support for the new language APIs
-        coreLibraryDesugaringEnabled = true
-        // Sets Java compatibility to Java 8
-        sourceCompatibility = JavaVersion.VERSION_1_8
-        targetCompatibility = JavaVersion.VERSION_1_8
-    }
-}
-dependencies {
-    // ... 
-    coreLibraryDesugaring("com.android.tools:desugar_jdk_libs:1.1.5")
-
-    // ... 
-}
-```
-Reference: https://developer.android.com/studio/write/java8-support
-
+### Minimum Android SDK
+- Currently aiming for a minimum SDK level of 21. Keeping in tune with OkHttp's requirement.
 
 ### Now configure your client instance
 
@@ -65,7 +41,7 @@ val context = UnleashContext.newBuilder()
 val config = UnleashConfig.newBuilder()
     .proxyUrl("URL to your proxy installation")
     .clientSecret("yourProxyApiKey")
-    .pollMode(PollingModes.autoPoll(Duration.ofSeconds(60)) {
+    .pollMode(PollingModes.autoPoll(60000) { // poll interval in milliseconds
         featuresUpdated()
     })
     .build()
@@ -100,7 +76,7 @@ val context = UnleashContext.newBuilder()
 val config = UnleashConfig.newBuilder()
     .proxyUrl("URL to your proxy installation")
     .clientSecret("yourProxyApiKey")
-    .pollMode(PollingModes.autoPoll(Duration.ofSeconds(60)) {
+    .pollMode(PollingModes.autoPoll(60000) { poll interval in milliseconds
         featuresUpdated()
     })
     .build()
@@ -144,6 +120,6 @@ val config = UnleashConfig
 
 The default configuration configures a daemon to report metrics once every minute, this can be altered using the `metricsInterval(Duration d)` method on the builder, so if you'd rather see us post in 5 minutes intervals you could do
 ```kotlin
-UnleasConfig().newBuilder().metricsInterval(Duration.ofMinutes(5))
+UnleashConfig().newBuilder().metricsInterval(300000) // Every 5 minutes
 ```
 

build.gradle.kts

@@ -26,22 +26,22 @@ jacoco {
 dependencies {
     implementation(platform("org.jetbrains.kotlin:kotlin-bom"))
     implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8")
-    implementation("com.fasterxml.jackson.core:jackson-databind:2.12.3")
-    implementation("com.fasterxml.jackson.core:jackson-core:2.12.3")
-    implementation("com.fasterxml.jackson.module:jackson-module-kotlin:2.12.3")
-    implementation("com.fasterxml.jackson.datatype:jackson-datatype-jsr310:2.12.3")
+    implementation("com.fasterxml.jackson.core:jackson-databind:2.12.5")
+    implementation("com.fasterxml.jackson.core:jackson-core:2.12.5")
+    implementation("com.fasterxml.jackson.module:jackson-module-kotlin:2.12.5")
+    implementation("com.fasterxml.jackson.datatype:jackson-datatype-jsr310:2.12.5")
     implementation("net.sourceforge.streamsupport:android-retrofuture:1.7.3")
     api("com.squareup.okhttp3:okhttp:4.9.1")
-    api("org.slf4j:slf4j-api:1.7.30")
+    api("org.slf4j:slf4j-api:1.7.32")
 
     testImplementation("org.jetbrains.kotlin:kotlin-test")
     testImplementation("org.jetbrains.kotlin:kotlin-test-junit5")
     testImplementation("org.junit.jupiter:junit-jupiter-api:5.7.2")
     testImplementation("org.junit.jupiter:junit-jupiter-engine:5.7.2")
-    testImplementation("org.assertj:assertj-core:3.19.0")
+    testImplementation("org.assertj:assertj-core:3.20.2")
     testImplementation("com.squareup.okhttp3:mockwebserver:4.9.1")
     testImplementation("org.mockito.kotlin:mockito-kotlin:3.2.0")
-    testImplementation("org.slf4j:slf4j-simple:1.7.30")
+    testImplementation("org.slf4j:slf4j-simple:1.7.32")
 }
 
 tasks.withType<org.jetbrains.kotlin.gradle.tasks.KotlinCompile> {
@@ -62,9 +62,10 @@ tasks.withType<Test> {
 tasks.jacocoTestReport {
     dependsOn(tasks.test) // tests are required to run before generating the report
     reports {
-        xml.isEnabled = true
-        html.isEnabled = true
+        xml.required.set(true)
+        html.required.set(true)
     }
+
 }
 
 

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.0.2-bin.zip
-distributionSha256Sum=0e46229820205440b48a5501122002842b82886e76af35f0f3a069243dca4b3c
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.2-bin.zip
+distributionSha256Sum=f581709a9c35e9cb92e16f585d2c4bc99b2b1a5f85d2badbd3dc6bff59e1e6dd
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists

samples/android/app/build.gradle

@@ -12,7 +12,7 @@ android {
 
     defaultConfig {
         applicationId "com.example.unleash"
-        minSdkVersion 26
+        minSdkVersion 21
         targetSdkVersion 30
         versionCode 1
         versionName "1.0"
@@ -50,7 +50,7 @@ dependencies {
     implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
     implementation 'androidx.navigation:navigation-fragment-ktx:2.3.5'
     implementation 'androidx.navigation:navigation-ui-ktx:2.3.5'
-    implementation 'io.getunleash:unleash-android-proxy-sdk:0.1.2-SNAPSHOT'
+    implementation 'io.getunleash:unleash-android-proxy-sdk:0.2.1-SNAPSHOT'
     testImplementation 'junit:junit:4.13.2'
     androidTestImplementation 'androidx.test.ext:junit:1.1.3'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'

samples/android/app/src/main/java/com/example/unleash/UnleashApplication.kt

@@ -35,7 +35,7 @@ internal object UnleashClientModule {
                     .appName("unleash-android")
                     .instanceId("unleash-android-${Random.nextLong()}")
                     .environment("dev")
-                    .clientSecret("proxy-123")
+                    .clientSecret("s1")
                     .proxyUrl("http://192.168.1.42:3200/proxy")
                     .enableMetrics()
                     .pollingMode(

src/main/kotlin/io/getunleash/UnleashClient.kt

@@ -14,6 +14,7 @@ import org.slf4j.Logger
 import org.slf4j.LoggerFactory
 import java.security.InvalidParameterException
 import java9.util.concurrent.CompletableFuture
+import java.util.concurrent.TimeUnit
 import kotlin.concurrent.timer
 
 /**
@@ -30,8 +31,8 @@ class UnleashClient(
     val unleashConfig: UnleashConfig,
     var unleashContext: UnleashContext = UnleashContext(),
     val httpClient: OkHttpClient = OkHttpClient.Builder()
-        .readTimeout(unleashConfig.httpClientReadTimeout)
-        .connectTimeout(unleashConfig.httpClientConnectionTimeout)
+        .readTimeout(unleashConfig.httpClientReadTimeout, TimeUnit.MILLISECONDS)
+        .connectTimeout(unleashConfig.httpClientConnectionTimeout, TimeUnit.MILLISECONDS)
         .cache(
             Cache(
                 directory = CacheDirectoryProvider().getCacheDirectory(),
@@ -65,8 +66,8 @@ class UnleashClient(
             timer(
                 name = "unleash_report_metrics",
                 daemon = true,
-                initialDelay = unleashConfig.reportMetrics.metricsInterval.toMillis(),
-                period = unleashConfig.reportMetrics.metricsInterval.toMillis()
+                initialDelay = unleashConfig.reportMetrics.metricsInterval,
+                period = unleashConfig.reportMetrics.metricsInterval
             ) {
                 metricsReporter.reportMetrics()
             }
@@ -119,8 +120,8 @@ class UnleashClient(
                 ?: throw IllegalStateException("You must set an UnleashConfig for your UnleashClient"),
             unleashContext = this.unleashContext ?: UnleashContext(),
             httpClient = this.httpClient ?: OkHttpClient.Builder()
-                    .readTimeout(unleashConfig!!.httpClientReadTimeout)
-                    .connectTimeout(unleashConfig!!.httpClientConnectionTimeout)
+                    .readTimeout(unleashConfig!!.httpClientReadTimeout, TimeUnit.MILLISECONDS)
+                    .connectTimeout(unleashConfig!!.httpClientConnectionTimeout, TimeUnit.MILLISECONDS)
                     .cache(
                         Cache(
                             directory = CacheDirectoryProvider().getCacheDirectory(),

src/main/kotlin/io/getunleash/UnleashConfig.kt

@@ -2,11 +2,10 @@ package io.getunleash
 
 import io.getunleash.polling.AutoPollingMode
 import io.getunleash.polling.PollingMode
-import java.time.Duration
 import java.util.UUID
 
 
-data class ReportMetrics(val metricsInterval: Duration = Duration.ofSeconds(60))
+data class ReportMetrics(val metricsInterval: Long = 60000)
 /**
  * Represents configuration for Unleash.
  * @property url HTTP(s) URL to the Unleash Proxy (Required).
@@ -15,8 +14,8 @@ data class ReportMetrics(val metricsInterval: Duration = Duration.ofSeconds(60))
  * @property environment which environment is the application running in. Will be used as default argument for the [io.getunleash.UnleashContext]. (Optional - Defaults to 'default')
  * @property instanceId instance id of your client
  * @property pollingMode How to poll for features. Defaults to [io.getunleash.polling.AutoPollingMode] with poll interval set to 60 seconds.
- * @property httpClientReadTimeout How long to wait for HTTP reads. (Optional - Defaults to 5 seconds)
- * @property httpClientConnectionTimeout How long to wait for HTTP connection. (Optional - Defaults to 2 seconds)
+ * @property httpClientReadTimeout How long to wait for HTTP reads in milliseconds. (Optional - Defaults to 5000)
+ * @property httpClientConnectionTimeout How long to wait for HTTP connection in milliseconds. (Optional - Defaults to 2000)
  * @property httpClientCacheSize Disk space (in bytes) set aside for http cache. (Optional - Defaults to 10MB)
  * @property reportMetrics Should the client collate and report metrics? The [io.getunleah.ReportMetrics] dataclass includes a metricsInterval field which defaults to 60 seconds. (Optional - defaults to null)
  */
@@ -26,9 +25,9 @@ data class UnleashConfig(
     val appName: String? = null,
     val environment: String? = null,
     val instanceId: String? = UUID.randomUUID().toString(),
-    val pollingMode: PollingMode = AutoPollingMode(Duration.ofSeconds(60)),
-    val httpClientConnectionTimeout: Duration = Duration.ofSeconds(2),
-    val httpClientReadTimeout: Duration = Duration.ofSeconds(5),
+    val pollingMode: PollingMode = AutoPollingMode(60000),
+    val httpClientConnectionTimeout: Long = 2000,
+    val httpClientReadTimeout: Long = 5000,
     val httpClientCacheSize: Long = 1024 * 1024 * 10,
     val reportMetrics: ReportMetrics? = null
 ) {
@@ -66,11 +65,11 @@ data class UnleashConfig(
         var appName: String? = null,
         var environment: String? = null,
         var pollingMode: PollingMode? = null,
-        var httpClientConnectionTimeout: Duration? = null,
-        var httpClientReadTimeout: Duration? = null,
+        var httpClientConnectionTimeout: Long? = null,
+        var httpClientReadTimeout: Long? = null,
         var httpClientCacheSize: Long? = null,
         var enableMetrics: Boolean = false,
-        var metricsInterval: Duration? = null,
+        var metricsInterval: Long? = null,
         var instanceId: String? = null,
 
     ) {
@@ -79,27 +78,28 @@ data class UnleashConfig(
         fun appName(appName: String) = apply { this.appName = appName }
         fun environment(environment: String) = apply { this.environment = environment }
         fun pollingMode(pollingMode: PollingMode) = apply { this.pollingMode = pollingMode }
-        fun httpClientConnectionTimeout(timeout: Duration) = apply { this.httpClientConnectionTimeout = timeout }
-        fun httpClientConnectionTimeoutInSeconds(seconds: Long) = apply { this.httpClientConnectionTimeout = Duration.ofSeconds(seconds) }
-        fun httpClientReadTimeout(timeout: Duration) = apply { this.httpClientReadTimeout = timeout }
-        fun httpClientReadTimeoutInSeconds(seconds: Long) = apply { this.httpClientReadTimeout = Duration.ofSeconds(seconds) }
+        fun httpClientConnectionTimeout(timeoutInMs: Long) = apply { this.httpClientConnectionTimeout = timeoutInMs }
+        fun httpClientConnectionTimeoutInSeconds(seconds: Long) = apply { this.httpClientConnectionTimeout = seconds * 1000 }
+        fun httpClientReadTimeout(timeoutInMs: Long) = apply { this.httpClientReadTimeout = timeoutInMs }
+        fun httpClientReadTimeoutInSeconds(seconds: Long) = apply { this.httpClientReadTimeout = seconds * 1000 }
         fun httpClientCacheSize(cacheSize: Long) = apply { this.httpClientCacheSize = cacheSize }
         fun enableMetrics() = apply { this.enableMetrics = true }
         fun disableMetrics() = apply { this.enableMetrics = false }
-        fun metricsInterval(duration: Duration) = apply { this.metricsInterval = duration }
+        fun metricsInterval(intervalInMs: Long) = apply { this.metricsInterval = intervalInMs }
+        fun metricsIntervalInSeconds(seconds: Long) = apply { this.metricsInterval = seconds * 1000 }
         fun instanceId(id: String) = apply { this.instanceId = id }
         fun build(): UnleashConfig = UnleashConfig(
             proxyUrl = proxyUrl ?: throw IllegalStateException("You have to set proxy url in your UnleashConfig"),
             clientSecret = clientSecret
                 ?: throw IllegalStateException("You have to set client secret in your UnleashConfig"),
             appName = appName,
             environment = environment,
-            pollingMode = pollingMode ?: AutoPollingMode(Duration.ofSeconds(60)),
-            httpClientConnectionTimeout = httpClientConnectionTimeout ?: Duration.ofSeconds(2),
-            httpClientReadTimeout = httpClientReadTimeout ?: Duration.ofSeconds(5),
-            httpClientCacheSize = httpClientCacheSize ?: 1024 * 1024 * 10,
+            pollingMode = pollingMode ?: AutoPollingMode(60000),
+            httpClientConnectionTimeout = httpClientConnectionTimeout ?: 2000,
+            httpClientReadTimeout = httpClientReadTimeout ?: 5000,
+            httpClientCacheSize = httpClientCacheSize ?: (1024 * 1024 * 10),
             reportMetrics = if (enableMetrics) {
-                ReportMetrics(metricsInterval ?: Duration.ofSeconds(60))
+                ReportMetrics(metricsInterval ?: 60000)
             } else {
                 null
             },

src/main/kotlin/io/getunleash/data/Parser.kt

@@ -1,9 +1,15 @@
 package io.getunleash.data
 
+import com.fasterxml.jackson.databind.ObjectMapper
 import com.fasterxml.jackson.databind.SerializationFeature
+import com.fasterxml.jackson.databind.util.StdDateFormat
 import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule
 import com.fasterxml.jackson.module.kotlin.jacksonObjectMapper
 
 object Parser {
-    val jackson = jacksonObjectMapper().registerModule(JavaTimeModule()).disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS)
+    val jackson: ObjectMapper =
+        jacksonObjectMapper().registerModule(JavaTimeModule()).disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS)
+            .setDateFormat(
+                StdDateFormat().withColonInTimeZone(true)
+            )
 }

src/main/kotlin/io/getunleash/errors/ServerException.kt

@@ -1,4 +1,4 @@
 package io.getunleash.errors
 
-class ServerException(statusCode: Int) : Exception("Unleash responsded with $statusCode") {
+class ServerException(statusCode: Int) : Exception("Unleash responded with $statusCode") {
 }

src/main/kotlin/io/getunleash/metrics/MetricsReporter.kt

@@ -16,8 +16,8 @@ import org.slf4j.Logger
 import org.slf4j.LoggerFactory
 import java.io.Closeable
 import java.io.IOException
-import java.time.Duration
-import java.time.Instant
+import java.util.Date
+import java.util.concurrent.TimeUnit
 
 interface MetricsReporter {
     /**
@@ -58,20 +58,20 @@ class NonReporter : MetricsReporter {
 
 data class EvaluationCount(var yes: Int, var no: Int, val variants: MutableMap<String, Int> = mutableMapOf())
 data class Bucket(
-    val start: Instant,
-    var stop: Instant? = null,
+    val start: Date,
+    var stop: Date? = null,
     val toggles: MutableMap<String, EvaluationCount> = mutableMapOf()
 )
 
 data class Report(val appName: String, val environment: String, val instanceId: String, val bucket: Bucket)
 
-class HttpMetricsReporter(val config: UnleashConfig, val started: Instant = Instant.now()) : MetricsReporter,
+class HttpMetricsReporter(val config: UnleashConfig, val started: Date = Date()) : MetricsReporter,
     Closeable {
     companion object {
         val logger: Logger = LoggerFactory.getLogger(MetricsReporter::class.java)
     }
 
-    val client = OkHttpClient.Builder().callTimeout(Duration.ofSeconds(2)).readTimeout(Duration.ofSeconds(5)).build()
+    val client = OkHttpClient.Builder().callTimeout(2, TimeUnit.SECONDS).readTimeout(5, TimeUnit.SECONDS).build()
     val metricsUrl = config.proxyUrl.toHttpUrl().newBuilder().addPathSegment("client").addPathSegment("metrics").build()
     private var bucket: Bucket = Bucket(start = started)
 
@@ -80,7 +80,7 @@ class HttpMetricsReporter(val config: UnleashConfig, val started: Instant = Inst
             appName = config.appName ?: "unknown",
             instanceId = config.instanceId ?: "not-set",
             environment = config.environment ?: "not-set",
-            bucket = bucket.copy(stop = Instant.now())
+            bucket = bucket.copy(stop = Date())
         )
         val request = Request.Builder().url(metricsUrl).post(
             Parser.jackson.writeValueAsString(report).toRequestBody("application/json".toMediaType())
@@ -95,7 +95,7 @@ class HttpMetricsReporter(val config: UnleashConfig, val started: Instant = Inst
                 }
             }
         })
-        bucket = Bucket(start = Instant.now())
+        bucket = Bucket(start = Date())
     }
 
     override fun log(featureName: String, enabled: Boolean): Boolean {

src/main/kotlin/io/getunleash/polling/AutoPollingMode.kt

@@ -1,8 +1,6 @@
 package io.getunleash.polling
 
-import java.time.Duration
-
-class AutoPollingMode(val pollRateDuration: Duration, val togglesUpdatedListener: TogglesUpdatedListener = TogglesUpdatedListener {  }, val erroredListener: TogglesErroredListener = TogglesErroredListener {  }) : PollingMode {
+class AutoPollingMode(val pollRateDuration: Long, val togglesUpdatedListener: TogglesUpdatedListener = TogglesUpdatedListener {  }, val erroredListener: TogglesErroredListener = TogglesErroredListener {  }) : PollingMode {
     override fun pollingIdentifier(): String = "auto"
 
 }

src/main/kotlin/io/getunleash/polling/AutoPollingPolicy.kt

@@ -36,7 +36,7 @@ class AutoPollingPolicy(
                 name = "unleash_toggles_fetcher",
                 initialDelay = 0L,
                 daemon = true,
-                period = autoPollingConfig.pollRateDuration.toMillis()
+                period = autoPollingConfig.pollRateDuration
             ) {
                 updateToggles()
                 if (!initialized.getAndSet(true)) {

src/main/kotlin/io/getunleash/FilePollingMode.kt → src/main/kotlin/io/getunleash/polling/FilePollingMode.kt

@@ -1,4 +1,4 @@
-package io.getunleash
+package io.getunleash.polling
 
 import io.getunleash.polling.PollingMode
 import java.io.File

src/main/kotlin/io/getunleash/polling/FilePollingPolicy.kt

@@ -1,7 +1,6 @@
 package io.getunleash.polling
 
 import com.fasterxml.jackson.module.kotlin.readValue
-import io.getunleash.FilePollingMode
 import io.getunleash.UnleashConfig
 import io.getunleash.UnleashContext
 import io.getunleash.cache.ToggleCache