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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.impl
import io.netty.buffer.ByteBuf
import org.onap.dcae.collectors.veshv.boundary.Collector
import org.onap.dcae.collectors.veshv.boundary.Sink
import org.onap.dcae.collectors.veshv.domain.RoutedMessage
import org.onap.dcae.collectors.veshv.domain.VesMessage
import reactor.core.publisher.Flux
import reactor.core.publisher.Mono
/**
* @author Piotr Jaszczyk <piotr.jaszczyk@nokia.com>
* @since May 2018
*/
internal class VesHvCollector(
private val wireDecoder: WireDecoder,
private val protobufDecoder: VesDecoder,
private val validator: MessageValidator,
private val router: Router,
private val sink: Sink) : Collector {
override fun handleConnection(dataStream: Flux<ByteBuf>): Mono<Void> =
dataStream
.flatMap(this::decodeWire)
.flatMap(this::decodeProtobuf)
.filter(this::validate)
.flatMap(this::findRoute)
.compose(sink::send)
.doOnNext(this::releaseMemory)
.then()
private fun decodeWire(wire: ByteBuf) = omitWhenNull(wire, wireDecoder::decode)
private fun decodeProtobuf(protobuf: ByteBuf) = releaseWhenNull(protobuf, protobufDecoder::decode)
private fun validate(msg: VesMessage): Boolean {
val valid = validator.isValid(msg)
if (!valid) {
msg.rawMessage.release()
}
return valid
}
private fun findRoute(msg: VesMessage): Mono<RoutedMessage> {
val routedMessage = router.findDestination(msg)
return if (routedMessage == null)
Mono.empty()
else
Mono.just(routedMessage)
}
private fun releaseMemory(msg: VesMessage) {
msg.rawMessage.release()
}
private fun <T>omitWhenNull(input: ByteBuf, mapper: (ByteBuf) -> T?): Mono<T> =
Mono.justOrEmpty(mapper(input))
private fun <T>releaseWhenNull(input: ByteBuf, mapper: (ByteBuf) -> T?): Mono<T> {
val result = mapper(input)
return if (result == null) {
input.release()
Mono.empty()
} else {
Mono.just(result)
}
}
}
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