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[dcaegen2/collectors/hv-ves.git] / hv-collector-dcae-app-simulator / src / main / kotlin / org / onap / dcae / collectors / veshv / simulators / dcaeapp / impl / adapters / KafkaSource.kt
1 /*
2  * ============LICENSE_START=======================================================
3  * dcaegen2-collectors-veshv
4  * ================================================================================
5  * Copyright (C) 2018 NOKIA
6  * ================================================================================
7  * Licensed under the Apache License, Version 2.0 (the "License");
8  * you may not use this file except in compliance with the License.
9  * You may obtain a copy of the License at
10  *
11  *      http://www.apache.org/licenses/LICENSE-2.0
12  *
13  * Unless required by applicable law or agreed to in writing, software
14  * distributed under the License is distributed on an "AS IS" BASIS,
15  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16  * See the License for the specific language governing permissions and
17  * limitations under the License.
18  * ============LICENSE_END=========================================================
19  */
20 package org.onap.dcae.collectors.veshv.simulators.dcaeapp.impl.adapters
21
22 import arrow.effects.IO
23 import org.apache.kafka.clients.consumer.ConsumerConfig
24 import org.apache.kafka.common.serialization.ByteArrayDeserializer
25 import org.onap.dcae.collectors.veshv.simulators.dcaeapp.impl.Consumer
26 import org.onap.dcae.collectors.veshv.utils.arrow.evaluateIo
27 import org.onap.dcae.collectors.veshv.utils.logging.Logger
28 import reactor.kafka.receiver.KafkaReceiver
29 import reactor.kafka.receiver.ReceiverOptions
30
31 /**
32  * @author Piotr Jaszczyk <piotr.jaszczyk@nokia.com>
33  * @since May 2018
34  */
35 class KafkaSource(private val receiver: KafkaReceiver<ByteArray, ByteArray>) {
36
37     fun start(): IO<Consumer> = IO {
38         val consumer = Consumer()
39         receiver.receive().map(consumer::update).evaluateIo().subscribe()
40         consumer
41     }
42
43     companion object {
44         private val logger = Logger(KafkaSource::class)
45
46         fun create(bootstrapServers: String, topics: Set<String>): KafkaSource {
47             return KafkaSource(KafkaReceiver.create(createReceiverOptions(bootstrapServers, topics)))
48         }
49
50         fun createReceiverOptions(bootstrapServers: String,
51                                   topics: Set<String>): ReceiverOptions<ByteArray, ByteArray>? {
52             val props = mapOf<String, Any>(
53                     ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG to bootstrapServers,
54                     ConsumerConfig.CLIENT_ID_CONFIG to "hv-collector-dcae-app-simulator",
55                     ConsumerConfig.GROUP_ID_CONFIG to "hv-collector-simulators",
56                     ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG to ByteArrayDeserializer::class.java,
57                     ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG to ByteArrayDeserializer::class.java,
58                     ConsumerConfig.AUTO_OFFSET_RESET_CONFIG to "earliest"
59             )
60             return ReceiverOptions.create<ByteArray, ByteArray>(props)
61                     .addAssignListener { partitions -> logger.debug { "Partitions assigned $partitions" } }
62                     .addRevokeListener { partitions -> logger.debug { "Partitions revoked $partitions" } }
63                     .subscription(topics)
64         }
65     }
66 }