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/*
* ============LICENSE_START=======================================================
* dcaegen2-collectors-veshv
* ================================================================================
* Copyright (C) 2018-2019 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.simulators.dcaeapp.impl
import org.onap.dcae.collectors.veshv.simulators.dcaeapp.impl.adapters.KafkaSource
import org.onap.dcae.collectors.veshv.utils.logging.Logger
import reactor.kafka.receiver.ReceiverRecord
import java.util.concurrent.ConcurrentLinkedQueue
/**
* @author Piotr Jaszczyk <piotr.jaszczyk@nokia.com>
* @since June 2018
*/
internal class ConsumerState(private val messages: ConcurrentLinkedQueue<ByteArray>) {
val messagesCount: Int by lazy {
messages.size
}
val consumedMessages: List<ByteArray> by lazy {
messages.toList()
}
}
internal interface ConsumerStateProvider {
fun currentState(): ConsumerState
fun reset()
}
internal class Consumer : ConsumerStateProvider {
private var consumedMessages: ConcurrentLinkedQueue<ByteArray> = ConcurrentLinkedQueue()
override fun currentState(): ConsumerState = ConsumerState(consumedMessages)
override fun reset() = consumedMessages.clear()
fun update(record: ReceiverRecord<ByteArray, ByteArray>) {
logger.trace { "Updating stats for message from ${record.topic()}:${record.partition()}" }
consumedMessages.add(record.value())
}
companion object {
private val logger = Logger(Consumer::class)
}
}
internal class ConsumerFactory(private val kafkaBootstrapServers: String) {
fun createConsumersForTopics(kafkaTopics: Set<String>): Map<String, Consumer> =
KafkaSource.create(kafkaBootstrapServers, kafkaTopics).let { kafkaSource ->
val topicToConsumer = kafkaTopics.associate { it to Consumer() }
kafkaSource.start()
.map {
val topic = it.topic()
topicToConsumer.get(topic)?.update(it)
?: logger.warn { "No consumer configured for topic $topic" }
}.subscribe()
topicToConsumer
}
companion object {
private val logger = Logger(ConsumerFactory::class)
}
}
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