Remove IO monad usage from simulators
[dcaegen2/collectors/hv-ves.git] / sources / 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 org.apache.kafka.clients.consumer.ConsumerConfig
23 import org.apache.kafka.common.serialization.ByteArrayDeserializer
24 import org.onap.dcae.collectors.veshv.simulators.dcaeapp.impl.Consumer
25 import org.onap.dcae.collectors.veshv.utils.logging.Logger
26 import reactor.kafka.receiver.KafkaReceiver
27 import reactor.kafka.receiver.ReceiverOptions
28
29 /**
30  * @author Piotr Jaszczyk <piotr.jaszczyk@nokia.com>
31  * @since May 2018
32  */
33 class KafkaSource(private val receiver: KafkaReceiver<ByteArray, ByteArray>) {
34
35     fun start() = Consumer()
36             .also { consumer ->
37                 receiver.receive().map(consumer::update)
38             }
39
40     companion object {
41         private val logger = Logger(KafkaSource::class)
42
43         fun create(bootstrapServers: String, topics: Set<String>): KafkaSource {
44             return KafkaSource(KafkaReceiver.create(createReceiverOptions(bootstrapServers, topics)))
45         }
46
47         fun createReceiverOptions(bootstrapServers: String,
48                                   topics: Set<String>): ReceiverOptions<ByteArray, ByteArray>? {
49             val props = mapOf<String, Any>(
50                     ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG to bootstrapServers,
51                     ConsumerConfig.CLIENT_ID_CONFIG to "hv-collector-dcae-app-simulator",
52                     ConsumerConfig.GROUP_ID_CONFIG to "hv-collector-simulators",
53                     ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG to ByteArrayDeserializer::class.java,
54                     ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG to ByteArrayDeserializer::class.java,
55                     ConsumerConfig.AUTO_OFFSET_RESET_CONFIG to "earliest"
56             )
57             return ReceiverOptions.create<ByteArray, ByteArray>(props)
58                     .addAssignListener { partitions -> logger.debug { "Partitions assigned $partitions" } }
59                     .addRevokeListener { partitions -> logger.debug { "Partitions revoked $partitions" } }
60                     .subscription(topics)
61         }
62     }
63 }