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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.impl
import arrow.core.getOrElse
import arrow.effects.IO
import arrow.effects.fix
import arrow.effects.instances.io.monadError.monadError
import arrow.typeclasses.bindingCatch
import org.onap.dcae.collectors.veshv.utils.arrow.getOption
import org.onap.dcae.collectors.veshv.utils.logging.Logger
import java.io.InputStream
import java.util.concurrent.atomic.AtomicReference
/**
* @author Piotr Jaszczyk <piotr.jaszczyk@nokia.com>
* @since August 2018
*/
class DcaeAppSimulator(private val consumerFactory: ConsumerFactory,
private val messageStreamValidation: MessageStreamValidation) {
private val consumerState: AtomicReference<ConsumerStateProvider> = AtomicReference()
fun listenToTopics(topicsString: String) = listenToTopics(extractTopics(topicsString))
fun listenToTopics(topics: Set<String>): IO<Unit> = IO.monadError().bindingCatch {
if (topics.isEmpty() || topics.any { it.isBlank() }) {
val message = "Topic list cannot be empty or contain empty elements, topics: $topics"
logger.info { message }
throw IllegalArgumentException(message)
}
logger.info { "Received new configuration. Creating consumer for topics: $topics" }
consumerState.set(consumerFactory.createConsumerForTopics(topics).bind())
}.fix()
fun state() = consumerState.getOption().map { it.currentState() }
fun resetState(): IO<Unit> = consumerState.getOption().fold(
{ IO.unit },
{ it.reset() }
)
fun validate(jsonDescription: InputStream) = messageStreamValidation.validate(jsonDescription, currentMessages())
private fun currentMessages(): List<ByteArray> =
consumerState.getOption()
.map { it.currentState().consumedMessages }
.getOrElse(::emptyList)
private fun extractTopics(topicsString: String): Set<String> =
topicsString.substringAfter("=")
.split(",")
.toSet()
companion object {
private val logger = Logger(DcaeAppSimulator::class)
}
}
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