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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 arrow.core.Option
import arrow.effects.IO
import org.onap.dcae.collectors.veshv.utils.logging.Logger
import reactor.kafka.receiver.ReceiverRecord
/**
* @author Piotr Jaszczyk <piotr.jaszczyk@nokia.com>
* @since June 2018
*/
class ConsumerState(val msgCount: Long, val lastKey: Option<ByteArray>, val lastValue: Option<ByteArray>)
interface ConsumerStateProvider {
fun currentState(): ConsumerState
fun reset(): IO<Unit>
}
class Consumer : ConsumerStateProvider {
private var msgCount = 0L
private var lastKey: ByteArray? = null
private var lastValue: ByteArray? = null
override fun currentState() =
ConsumerState(msgCount, Option.fromNullable(lastKey), Option.fromNullable(lastValue))
override fun reset() = IO {
synchronized(this) {
msgCount = 0
lastKey = null
lastValue = null
}
}
fun update(record: ReceiverRecord<ByteArray, ByteArray>) {
logger.trace { "Updating stats for message from ${record.topic()}:${record.partition()}" }
synchronized(this) {
msgCount++
lastKey = record.key()
lastValue = record.value()
}
}
companion object {
private val logger = Logger(Consumer::class)
}
}
class ConsumerFactory(val kafkaBootstrapServers: String) {
fun createConsumerForTopics(kafkaTopics: Set<String>): ConsumerStateProvider {
return KafkaSource.create(kafkaBootstrapServers, kafkaTopics.toSet()).start().unsafeRunSync()
}
}
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