Change handling of offset metric for consumer app

Change-Id: Ia83469783d64d0174624489df671006e72bc8948
Issue-ID: DCAEGEN2-1635
Signed-off-by: kjaniak <kornel.janiak@nokia.com>

3 files changed, 21 insertions, 12 deletions

diff --git a/sources/hv-collector-kafka-consumer/src/main/kotlin/org/onap/dcae/collectors/veshv/kafkaconsumer/metrics/Metrics.kt b/sources/hv-collector-kafka-consumer/src/main/kotlin/org/onap/dcae/collectors/veshv/kafkaconsumer/metrics/Metrics.kt
index e576a88f..55fae457 100644
--- a/sources/hv-collector-kafka-consumer/src/main/kotlin/org/onap/dcae/collectors/veshv/kafkaconsumer/metrics/Metrics.kt
+++ b/sources/hv-collector-kafka-consumer/src/main/kotlin/org/onap/dcae/collectors/veshv/kafkaconsumer/metrics/Metrics.kt
@@ -19,7 +19,9 @@
  */
 package org.onap.dcae.collectors.veshv.kafkaconsumer.metrics
 
+import org.apache.kafka.common.TopicPartition
+
 interface Metrics {
-    fun notifyOffsetChanged(offset: Long, topic: String, partition: Int = 0)
+    fun notifyOffsetChanged(offset: Long, topicPartition: TopicPartition)
     fun notifyMessageTravelTime(messageSentTimeMicros: Long)
 }
diff --git a/sources/hv-collector-kafka-consumer/src/main/kotlin/org/onap/dcae/collectors/veshv/kafkaconsumer/metrics/MicrometerMetrics.kt b/sources/hv-collector-kafka-consumer/src/main/kotlin/org/onap/dcae/collectors/veshv/kafkaconsumer/metrics/MicrometerMetrics.kt
index da1225e9..0af2cb22 100644
--- a/sources/hv-collector-kafka-consumer/src/main/kotlin/org/onap/dcae/collectors/veshv/kafkaconsumer/metrics/MicrometerMetrics.kt
+++ b/sources/hv-collector-kafka-consumer/src/main/kotlin/org/onap/dcae/collectors/veshv/kafkaconsumer/metrics/MicrometerMetrics.kt
@@ -19,9 +19,12 @@
  */
 package org.onap.dcae.collectors.veshv.kafkaconsumer.metrics
 
+import arrow.syntax.function.memoize
+import io.micrometer.core.instrument.Tag
 import io.micrometer.core.instrument.Timer
 import io.micrometer.prometheus.PrometheusConfig
 import io.micrometer.prometheus.PrometheusMeterRegistry
+import org.apache.kafka.common.TopicPartition
 import org.onap.dcae.collectors.veshv.utils.TimeUtils
 import reactor.core.publisher.Mono
 import java.time.Duration
@@ -32,8 +35,11 @@ internal class MicrometerMetrics constructor(
         private val registry: PrometheusMeterRegistry = PrometheusMeterRegistry(PrometheusConfig.DEFAULT)
 ) : Metrics {
 
-    private val currentOffset = registry.gauge(name("consumer.offset"), AtomicLong(0))
-    private val travelTime = Timer.builder(name("travel.time"))
+    private val currentOffsetByTopicPartition = { topic: String ->
+        registry.gauge(name(CONSUMER, OFFSET, TOPIC), listOf(Tag.of(TOPIC, topic)), AtomicLong(0))
+    }.memoize<String, AtomicLong>()
+
+    private val travelTime = Timer.builder(name(TRAVEL,TIME))
             .publishPercentileHistogram(true)
             .register(registry)
 
@@ -41,9 +47,8 @@ internal class MicrometerMetrics constructor(
         registry.scrape()
     }
 
-    override fun notifyOffsetChanged(offset: Long, topic: String, partition: Int) {
-        // TODO use topic and partition
-        currentOffset.lazySet(offset)
+    override fun notifyOffsetChanged(offset: Long, topicPartition: TopicPartition) {
+        currentOffsetByTopicPartition(topicPartition.toString()).set(offset)
     }
 
     override fun notifyMessageTravelTime(messageSentTimeMicros: Long) {
@@ -51,8 +56,13 @@ internal class MicrometerMetrics constructor(
     }
 
     companion object {
-        val INSTANCE by lazy { MicrometerMetrics() }
 
+        val INSTANCE by lazy { MicrometerMetrics() }
+        private const val CONSUMER = "consumer"
+        private const val OFFSET = "offset"
+        private const val TOPIC = "topic"
+        private const val TRAVEL = "travel"
+        private const val TIME = "time"
         private const val PREFIX = "hv-kafka-consumer"
         private fun name(vararg name: String) = "$PREFIX.${name.joinToString(".")}"
     }
diff --git a/sources/hv-collector-kafka-consumer/src/main/kotlin/org/onap/dcae/collectors/veshv/kafkaconsumer/state/OffsetConsumer.kt b/sources/hv-collector-kafka-consumer/src/main/kotlin/org/onap/dcae/collectors/veshv/kafkaconsumer/state/OffsetConsumer.kt
index 1481a224..57a5f33f 100644
--- a/sources/hv-collector-kafka-consumer/src/main/kotlin/org/onap/dcae/collectors/veshv/kafkaconsumer/state/OffsetConsumer.kt
+++ b/sources/hv-collector-kafka-consumer/src/main/kotlin/org/onap/dcae/collectors/veshv/kafkaconsumer/state/OffsetConsumer.kt
@@ -28,14 +28,11 @@ internal class OffsetConsumer(private val metrics: Metrics) {
 
     fun update(topicPartition: TopicPartition, offset: Long) {
         logger.trace {
-            "Current consumer offset $offset for topic ${topicPartition.topic()} " +
-                    "on partition ${topicPartition.partition()}"
+            "Current consumer offset $offset for topic partition $topicPartition"
         }
-        metrics.notifyOffsetChanged(offset, topicPartition.topic(), topicPartition.partition())
+        metrics.notifyOffsetChanged(offset, topicPartition)
     }
 
-    fun reset() = Unit
-
     companion object {
         val logger = Logger(OffsetConsumer::class)
     }