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/*
* Copyright (C) 2020 The Android Open Source Project
*
* 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.
*/
package com.android.testutils
import java.util.function.Predicate
private const val POLL_FREQUENCY_MS = 1000L
/**
* A class that can be used to reply to packets from a [TapPacketReader].
*
* A reply thread will be created to reply to incoming packets asynchronously.
* The receiver creates a new read head on the [TapPacketReader], to read packets, so it does not
* affect packets obtained through [TapPacketReader.popPacket].
*
* @param reader a [TapPacketReader] to obtain incoming packets and reply to them.
* @param packetFilter A filter to apply to incoming packets.
* @param name Name to use for the internal responder thread.
*/
abstract class PacketResponder(
private val reader: TapPacketReader,
private val packetFilter: Predicate<ByteArray>,
name: String
) {
private val replyThread = ReplyThread(name)
protected abstract fun replyToPacket(packet: ByteArray, reader: TapPacketReader)
/**
* Start the [PacketResponder].
*/
fun start() {
replyThread.start()
}
/**
* Stop the [PacketResponder].
*
* The responder cannot be used anymore after being stopped.
*/
fun stop() {
replyThread.interrupt()
replyThread.join()
}
private inner class ReplyThread(name: String) : Thread(name) {
override fun run() {
try {
// Create a new ReadHead so other packets polled on the reader are not affected
val recvPackets = reader.receivedPackets.newReadHead()
while (!isInterrupted) {
recvPackets.poll(POLL_FREQUENCY_MS, packetFilter::test)?.let {
replyToPacket(it, reader)
}
}
} catch (e: InterruptedException) {
// Exit gracefully
}
}
}
}
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