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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.wire
import io.netty.buffer.ByteBuf
import org.onap.dcae.collectors.veshv.domain.WireFrame
import org.onap.dcae.collectors.veshv.domain.WireFrameDecoder
import org.onap.dcae.collectors.veshv.domain.exceptions.MissingWireFrameBytesException
import org.onap.dcae.collectors.veshv.utils.logging.Logger
import reactor.core.publisher.FluxSink
/**
* @author Piotr Jaszczyk <piotr.jaszczyk@nokia.com>
* @since May 2018
*/
internal class WireFrameSink(
private val decoder: WireFrameDecoder,
private val streamBuffer: ByteBuf,
private val sink: FluxSink<WireFrame>,
private val requestedFrameCount: Long) {
private var completed = false
fun handleSubscriber() {
if (!completed) {
logger.trace { "Decoder buffer capacity before decoding frame: ${streamBuffer.capacity()}" }
try {
if (requestedFrameCount == Long.MAX_VALUE) {
logger.trace { "Push based strategy" }
pushAvailableFrames()
} else {
logger.trace { "Pull based strategy - req $requestedFrameCount" }
pushUpToNumberOfFrames()
}
} catch (ex: Exception) {
completed = true
sink.error(ex)
}
logger.trace { "Decoder buffer capacity after decoding frame: ${streamBuffer.capacity()}" }
}
}
private fun pushAvailableFrames() {
var nextFrame = decodeFirstFrameFromBuffer()
while (nextFrame != null && !sink.isCancelled) {
sink.next(nextFrame)
nextFrame = decodeFirstFrameFromBuffer()
}
completed = true
sink.complete()
}
private fun pushUpToNumberOfFrames() {
var nextFrame = decodeFirstFrameFromBuffer()
var remaining = requestedFrameCount
loop@ while (nextFrame != null && !sink.isCancelled) {
sink.next(nextFrame)
if (--remaining > 0) {
nextFrame = decodeFirstFrameFromBuffer()
} else {
break@loop
}
}
if (remaining > 0 && nextFrame == null) {
completed = true
sink.complete()
}
}
private fun decodeFirstFrameFromBuffer(): WireFrame? =
try {
decoder.decodeFirst(streamBuffer)
} catch (ex: MissingWireFrameBytesException) {
logger.trace { "${ex.message} - waiting for more data" }
null
}
companion object {
private val logger = Logger(WireFrameSink::class)
}
}
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