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// Copyright 2023 Google LLC
//
// 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
//
// https://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.
package com.github.google.bumble.btbench
import java.util.concurrent.Semaphore
import java.util.logging.Logger
import kotlin.time.DurationUnit
import kotlin.time.TimeSource
private val Log = Logger.getLogger("btbench.sender")
class Sender(private val viewModel: AppViewModel, private val packetIO: PacketIO) : PacketSink() {
private var startTime: TimeSource.Monotonic.ValueTimeMark = TimeSource.Monotonic.markNow()
private var bytesSent = 0
private val done = Semaphore(0)
init {
packetIO.packetSink = this
}
fun run() {
viewModel.packetsSent = 0
viewModel.packetsReceived = 0
viewModel.throughput = 0
Log.info("sending reset")
packetIO.sendPacket(ResetPacket())
startTime = TimeSource.Monotonic.markNow()
val packetCount = viewModel.senderPacketCount
val packetSize = viewModel.senderPacketSize
for (i in 0..<packetCount - 1) {
packetIO.sendPacket(SequencePacket(0, i, ByteArray(packetSize - 6)))
bytesSent += packetSize
viewModel.packetsSent = i + 1
}
packetIO.sendPacket(
SequencePacket(
Packet.LAST_FLAG,
packetCount - 1,
ByteArray(packetSize - 6)
)
)
bytesSent += packetSize
viewModel.packetsSent = packetCount
// Wait for the ACK
Log.info("waiting for ACK")
done.acquire()
Log.info("got ACK")
}
fun abort() {
done.release()
}
override fun onResetPacket() {
}
override fun onAckPacket() {
Log.info("received ACK")
val elapsed = TimeSource.Monotonic.markNow() - startTime
val throughput = (bytesSent / elapsed.toDouble(DurationUnit.SECONDS)).toInt()
Log.info("throughput: $throughput")
viewModel.throughput = throughput
done.release()
}
override fun onSequencePacket(packet: SequencePacket) {
}
}
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