Generated by GPT3

PacketReceiver.java

import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
import java.util.Iterator;
import java.util.Queue;
import java.util.concurrent.ConcurrentLinkedQueue;

public class PacketReceiver {
    private static final int BUFFER_SIZE = 1024;
    private static final int PORT = 12345;

    private final Queue<ByteBuffer> processingQueue = new ConcurrentLinkedQueue<>();

    public void start() throws IOException {
        Selector selector = Selector.open();
        ServerSocketChannel serverSocketChannel = ServerSocketChannel.open();
        serverSocketChannel.configureBlocking(false);
        serverSocketChannel.bind(new InetSocketAddress(PORT));
        serverSocketChannel.register(selector, SelectionKey.OP_ACCEPT);

        while (true) {
            selector.select();
            Iterator<SelectionKey> iterator = selector.selectedKeys().iterator();
            while (iterator.hasNext()) {
                SelectionKey key = iterator.next();
                if (key.isAcceptable()) {
                    SocketChannel clientSocketChannel = serverSocketChannel.accept();
                    clientSocketChannel.configureBlocking(false);
                    clientSocketChannel.register(selector, SelectionKey.OP_READ);
                } else if (key.isReadable()) {
                    SocketChannel clientSocketChannel = (SocketChannel) key.channel();
                    ByteBuffer buffer = ByteBuffer.allocate(BUFFER_SIZE);
                    clientSocketChannel.read(buffer);
                    buffer.flip();
                    byte[] decryptedPacket = decrypt(buffer.array());
                    processingQueue.add(ByteBuffer.wrap(decryptedPacket));
                }
                iterator.remove();
            }
            processPackets();
        }
    }

    private void processPackets() {
        ByteBuffer buffer;
        while ((buffer = processingQueue.poll()) != null) {
            printPacket(buffer);
        }
    }

    private void printPacket(ByteBuffer buffer) {
        while (buffer.hasRemaining()) {
            System.out.printf("%02x", buffer.get());
        }
        System.out.println();
    }

    private byte[] decrypt(byte[] packet) {
        // Decrypt the packet here using the appropriate protocol
        return packet;
    }
}