replaced Function<SpanData, String> with a custom CategoryFunction i…

…nterface and Duration with a plain long value for timeWindowInMillis

 ref open-telemetry#638

.vscode/settings.json

@@ -0,0 +1,3 @@
+{
+    "java.configuration.updateBuildConfiguration": "automatic"
+}

core/build.gradle.kts

@@ -12,12 +12,6 @@ android {
         testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
         consumerProguardFiles("consumer-rules.pro")
         buildConfigField("String", "OTEL_ANDROID_VERSION", "\"$version\"")
-
-// Enable desugaring for Java 8 features
-        compileOptions {
-            sourceCompatibility = JavaVersion.VERSION_1_8 // Set source compatibility to Java 8
-            targetCompatibility = JavaVersion.VERSION_1_8 // Set target compatibility to Java 8
-        }
     }
 
     buildTypes {

core/src/main/java/io/opentelemetry/android/export/RateLimitedExporter.java

@@ -28,8 +28,7 @@ private BandwidthThrottlingExporter(Builder builder) {
         this.categoryFunction = builder.categoryFunction;
         this.maxBytesPerSecond = builder.maxBytesPerSecond;
         this.timeWindowInMillis = builder.timeWindow.toMillis();
-        this.lastExportTime = System.currentTimeMillis();
-
+        this.lastExportTime = SystemTime.get().getCurrentTimeMillis();
         this.bytesExportedInWindow = 0;
     }
 
@@ -88,9 +87,9 @@ public CompletableResultCode shutdown() {
 
     static class Builder {
         final SpanExporter delegate;
-        Function<SpanData, String> categoryFunction = span -> "default";
+        CategoryFunction categoryFunction = span -> "default";
         long maxBytesPerSecond = 1024; // Default to 1 KB/s
-        Duration timeWindow = Duration.ofSeconds(1); // Default to 1 second
+        long timeWindowInMillis = 1000; // Default to 1 second
 
         private Builder(SpanExporter delegate) {
             this.delegate = delegate;