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/*
* ============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.impl
import kotlinx.coroutines.CoroutineDispatcher
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.GlobalScope
import kotlinx.coroutines.Job
import kotlinx.coroutines.delay
import kotlinx.coroutines.isActive
import kotlinx.coroutines.launch
import org.apache.kafka.clients.consumer.KafkaConsumer
import org.apache.kafka.common.TopicPartition
import org.onap.dcae.collectors.veshv.kafkaconsumer.api.MetricsKafkaConsumer
import org.onap.dcae.collectors.veshv.kafkaconsumer.metrics.Metrics
import org.onap.dcae.collectors.veshv.utils.logging.Logger
import java.time.Duration
internal class OffsetKafkaConsumer(private val kafkaConsumer: KafkaConsumer<ByteArray, ByteArray>,
private val topics: Set<String>,
private val metrics: Metrics,
private val dispatcher: CoroutineDispatcher = Dispatchers.IO)
: MetricsKafkaConsumer {
override suspend fun start(updateInterval: Long, pollTimeout: Duration): Job =
GlobalScope.launch(dispatcher) {
val topicPartitions = topics.flatMap(kafkaConsumer::partitionsFor)
.map { TopicPartition(it.topic(), it.partition()) }
kafkaConsumer.assign(topicPartitions)
while (isActive) {
kafkaConsumer.endOffsets(kafkaConsumer.assignment())
.forEach { (topicPartition, offset) ->
update(topicPartition, offset)
}
kafkaConsumer.commitSync()
delay(updateInterval)
}
}
private fun update(topicPartition: TopicPartition, offset: Long) {
logger.trace {
"Current consumer offset $offset for topic partition $topicPartition"
}
metrics.notifyOffsetChanged(offset, topicPartition)
}
companion object {
private val logger = Logger(OffsetKafkaConsumer::class)
}
}
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