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
11 * http://www.apache.org/licenses/LICENSE-2.0
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=========================================================
20 package org.onap.dcae.collectors.veshv.simulators.dcaeapp.impl
22 import arrow.core.getOrElse
23 import arrow.effects.IO
24 import arrow.effects.fix
25 import arrow.effects.instances.io.monadError.monadError
26 import arrow.typeclasses.bindingCatch
27 import org.onap.dcae.collectors.veshv.utils.arrow.getOption
28 import org.onap.dcae.collectors.veshv.utils.logging.Logger
29 import java.io.InputStream
30 import java.util.concurrent.atomic.AtomicReference
33 * @author Piotr Jaszczyk <piotr.jaszczyk@nokia.com>
36 class DcaeAppSimulator(private val consumerFactory: ConsumerFactory,
37 private val messageStreamValidation: MessageStreamValidation) {
38 private val consumerState: AtomicReference<ConsumerStateProvider> = AtomicReference()
40 fun listenToTopics(topicsString: String) = listenToTopics(extractTopics(topicsString))
42 fun listenToTopics(topics: Set<String>): IO<Unit> = IO.monadError().bindingCatch {
43 if (topics.any { it.isBlank() })
44 throw IllegalArgumentException("Topic list cannot contain empty elements")
46 throw IllegalArgumentException("Topic list cannot be empty")
48 logger.info("Received new configuration. Creating consumer for topics: $topics")
49 consumerState.set(consumerFactory.createConsumerForTopics(topics).bind())
52 fun state() = consumerState.getOption().map { it.currentState() }
54 fun resetState(): IO<Unit> = consumerState.getOption().fold(
59 fun validate(jsonDescription: InputStream) = messageStreamValidation.validate(jsonDescription, currentMessages())
61 private fun currentMessages(): List<ByteArray> =
62 consumerState.getOption()
63 .map { it.currentState().consumedMessages }
64 .getOrElse(::emptyList)
66 private fun extractTopics(topicsString: String): Set<String> =
67 topicsString.substringAfter("=")
72 private val logger = Logger(DcaeAppSimulator::class)