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/*
* ============LICENSE_START=======================================================
* dcaegen2-collectors-veshv
* ================================================================================
* Copyright (C) 2018 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.simulators.dcaeapp.kafka
import org.apache.kafka.clients.consumer.ConsumerConfig
import org.apache.kafka.common.serialization.ByteArrayDeserializer
import org.onap.dcae.collectors.veshv.utils.logging.Logger
import reactor.core.publisher.Mono
import reactor.kafka.receiver.KafkaReceiver
import reactor.kafka.receiver.ReceiverOptions
import reactor.kafka.receiver.ReceiverRecord
import java.util.*
import java.util.concurrent.atomic.AtomicLong
/**
* @author Piotr Jaszczyk <piotr.jaszczyk@nokia.com>
* @since May 2018
*/
class KafkaSource(private val receiver: KafkaReceiver<ByteArray, ByteArray>) {
private val consumedMessages = AtomicLong(0)
fun start(): Mono<Void> = Mono.create { sink ->
receiver.doOnConsumer { it.subscription() }.subscribe({ sink.success() }, sink::error)
receiver.receive().subscribe(this::update)
}
fun consumedMessages() = consumedMessages.get()
private fun update(record: ReceiverRecord<ByteArray, ByteArray>) {
consumedMessages.incrementAndGet()
}
companion object {
private val logger = Logger(KafkaSource::class)
fun create(bootstrapServers: String, topics: Set<String>): KafkaSource {
val props = HashMap<String, Any>()
props[ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG] = bootstrapServers
props[ConsumerConfig.CLIENT_ID_CONFIG] = "hv-collector-dcae-app-simulator"
props[ConsumerConfig.GROUP_ID_CONFIG] = "hv-collector-simulators"
props[ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG] = ByteArrayDeserializer::class.java
props[ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG] = ByteArrayDeserializer::class.java
props[ConsumerConfig.AUTO_OFFSET_RESET_CONFIG] = "earliest"
val receiverOptions = ReceiverOptions.create<ByteArray, ByteArray>(props)
.addAssignListener { partitions -> logger.debug { "onPartitionsAssigned $partitions" } }
.addRevokeListener { partitions -> logger.debug { "onPartitionsRevoked $partitions" } }
.subscription(topics)
return KafkaSource(KafkaReceiver.create(receiverOptions))
}
}
}
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