Implement message counting in consumer

Issue-ID: DCAEGEN2-1635
Change-Id: I2666de7bad27052d9cefa0f687ad0772d4c9a95d
Signed-off-by: kjaniak <kornel.janiak@nokia.com>

3 files changed, 47 insertions, 1 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 cbdb45dc..64a7fb3e 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
@@ -19,4 +19,6 @@
  */
 package org.onap.dcae.collectors.veshv.kafkaconsumer.metrics
 
-internal interface Metrics
\ No newline at end of file
+internal interface Metrics {
+    fun notifyOffsetChanged(size: 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 adb1ff1f..f137d074 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
@@ -26,6 +26,9 @@ import reactor.core.publisher.Mono
 internal class MicrometerMetrics constructor(
         private val registry: PrometheusMeterRegistry = PrometheusMeterRegistry(PrometheusConfig.DEFAULT)
 ) : Metrics {
+    override fun notifyOffsetChanged(size: Long) {
+        // TODO implementation here
+    }
 
     fun lastStatus(): Mono<String> = Mono.fromCallable {
         registry.scrape()
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
new file mode 100644
index 00000000..2c6707f9
--- /dev/null
+++ b/sources/hv-collector-kafka-consumer/src/main/kotlin/org/onap/dcae/collectors/veshv/kafkaconsumer/state/OffsetConsumer.kt
@@ -0,0 +1,41 @@
+/*
+ * ============LICENSE_START=======================================================
+ * dcaegen2-collectors-veshv
+ * ================================================================================
+ * Copyright (C) 2019 NOKIA
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+package org.onap.dcae.collectors.veshv.kafkaconsumer.state
+
+import org.apache.kafka.clients.consumer.ConsumerRecord
+import org.onap.dcae.collectors.veshv.kafka.api.KafkaConsumer
+import org.onap.dcae.collectors.veshv.kafkaconsumer.metrics.Metrics
+import org.onap.dcae.collectors.veshv.utils.logging.Logger
+
+
+internal class OffsetConsumer(private val metrics: Metrics): KafkaConsumer  {
+
+    override fun update(record: ConsumerRecord<ByteArray, ByteArray>) {
+        val offset = record.offset()
+        logger.trace { "Current consumer offset $offset" }
+        metrics.notifyOffsetChanged(offset)
+    }
+
+    override fun reset() = Unit
+
+    companion object {
+        private val logger = Logger(OffsetConsumer::class)
+    }
+}