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/*
* Copyright © 2018-2019 AT&T Intellectual Property.
*
* 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.
*/
package org.onap.ccsdk.cds.blueprintsprocessor.message.service
import kotlinx.coroutines.channels.Channel
import org.apache.kafka.clients.consumer.ConsumerRecord
import org.apache.kafka.streams.KafkaStreams
import org.onap.ccsdk.cds.blueprintsprocessor.message.MessageConsumerProperties
import org.onap.ccsdk.cds.controllerblueprints.core.BluePrintProcessorException
import org.onap.ccsdk.cds.controllerblueprints.core.logger
import java.util.Properties
open class KafkaStreamsConsumerService(private val messageConsumerProperties: MessageConsumerProperties) :
BlueprintMessageConsumerService {
val log = logger(KafkaStreamsConsumerService::class)
lateinit var kafkaStreams: KafkaStreams
private fun streamsConfig(additionalConfig: Map<String, Any>? = null): Properties {
val configProperties = Properties()
/** set consumer properties */
messageConsumerProperties.getConfig().let { configProperties.putAll(it) }
/** add or override already set properties */
additionalConfig?.let { configProperties.putAll(it) }
/** Create Kafka consumer */
return configProperties
}
override suspend fun subscribe(additionalConfig: Map<String, Any>?): Channel<ConsumerRecord<String, ByteArray>> {
throw BluePrintProcessorException("not implemented")
}
override suspend fun subscribe(topics: List<String>, additionalConfig: Map<String, Any>?): Channel<ConsumerRecord<String, ByteArray>> {
throw BluePrintProcessorException("not implemented")
}
override suspend fun consume(additionalConfig: Map<String, Any>?, consumerFunction: ConsumerFunction) {
val streamsConfig = streamsConfig(additionalConfig)
val kafkaStreamConsumerFunction = consumerFunction as KafkaStreamConsumerFunction
val topology = kafkaStreamConsumerFunction.createTopology(messageConsumerProperties, additionalConfig)
log.info("Kafka streams topology : ${topology.describe()}")
kafkaStreams = KafkaStreams(topology, streamsConfig)
kafkaStreams.cleanUp()
kafkaStreams.start()
kafkaStreams.localThreadsMetadata().forEach { data -> log.info("Topology : $data") }
}
override suspend fun shutDown() {
if (kafkaStreams != null) {
kafkaStreams.close()
}
}
}
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