public static void main(final String[] args) throws IOException {
final FileChannel receiveFileChannel = Common.createTmpFileChannel();
final ByteBuffer receiveByteBuffer =
receiveFileChannel.map(FileChannel.MapMode.READ_WRITE, 0, MTU_LENGTH_DEFAULT);
final DatagramChannel receiveDatagramChannel = DatagramChannel.open();
init(receiveDatagramChannel);
receiveDatagramChannel.bind(new InetSocketAddress("localhost", 40124));
receiveDatagramChannel.connect(new InetSocketAddress("localhost", 40123));
final FileChannel sendFileChannel = Common.createTmpFileChannel();
final ByteBuffer sendByteBuffer =
sendFileChannel.map(FileChannel.MapMode.READ_WRITE, 0, MTU_LENGTH_DEFAULT);
final DatagramChannel sendDatagramChannel = DatagramChannel.open();
init(sendDatagramChannel);
sendDatagramChannel.bind(new InetSocketAddress("localhost", 40125));
sendDatagramChannel.connect(new InetSocketAddress("localhost", 40126));
final AtomicBoolean running = new AtomicBoolean(true);
SigInt.register(() -> running.set(false));
final int packetSize = SIZE_OF_LONG * 2;
while (true) {
boolean available = false;
while (!available) {
if (!running.get()) {
return;
}
final long bytesReceived =
receiveFileChannel.transferFrom(receiveDatagramChannel, 0, packetSize);
if (packetSize == bytesReceived) {
available = true;
}
}
final long receivedSequenceNumber = receiveByteBuffer.getLong(0);
final long receivedTimestamp = receiveByteBuffer.getLong(SIZE_OF_LONG);
sendByteBuffer.putLong(0, receivedSequenceNumber);
sendByteBuffer.putLong(SIZE_OF_LONG, receivedTimestamp);
final long bytesSent = sendFileChannel.transferTo(0, packetSize, sendDatagramChannel);
if (packetSize != bytesSent) {
throw new IllegalStateException("Invalid bytes sent " + bytesSent);
}
}
}
